import { useEffect, useMemo, useState, type FormEvent, type ReactNode } from 'react'
import { Link, useNavigate, useParams, useSearchParams } from 'react-router-dom'
import {
  assignTeacherClass,
  assignStudentClass,
  autoDistributeStudents,
  banIp,
  createSubjectCurriculum,
  createAdministratorCalendarEvent,
  createClassSection,
  deleteSubjectCurriculum,
  deleteAdministratorCalendarEvent,
  deleteClassSection,
  deleteLateSlipLog,
  deleteTeacherClassAssignment,
  deleteUser,
  fetchAdministratorCalendarEvent,
  fetchAdministratorCalendarEvents,
  fetchAdministratorDailyAttendance,
  fetchBroadcastEmailOptions,
  fetchClassSections,
  fetchExamDraftAdminData,
  fetchFamilyAdminIndex,
  fetchGradingOverview,
  fetchIpBans,
  fetchLateSlipLogs,
  fetchNotificationAlerts,
  fetchPaypalTransactions,
  fetchPaypalTransactionsCsv,
  fetchPrintNotificationRecipients,
  fetchSchoolCalendarOptions,
  fetchRemovedStudents,
  fetchStudentDirectory,
  fetchStudentEmergencyContacts,
  fetchStudentParent,
  fetchStudentPromotionTotals,
  fetchSubjectCurriculum,
  fetchStudentAssignments,
  fetchTeacherClassAssignments,
  fetchTeacherSubmissions,
  fetchUsers,
  notifyTeacherSubmissions,
  removeStudentClass,
  reviewExamDraft,
  saveNotificationAlerts,
  savePrintNotificationRecipients,
  searchAdministratorDashboard,
  sendBroadcastEmail,
  setStudentActive,
  unbanIp,
  uploadLegacyExamDraft,
  updateAdministratorCalendarEvent,
  updateClassSection,
  updateStudentProfile,
  updateSubjectCurriculum,
} from '../api/session'
import type {
  AdministratorDashboardSearchResponse,
  BroadcastEmailParentOption,
  ClassSectionRow,
  ExamDraftRow,
  GradingOverviewStudentRow,
  NotificationAdminRow,
  RemovedStudentRow,
  SchoolCalendarDetailRow,
  SchoolCalendarEventRow,
  StudentDirectoryRow,
  StudentAssignmentOption,
  StudentAssignmentRow,
  StudentPromotionTotalsRow,
  SubjectCurriculumEntryRow,
  TeacherClassAssignmentRow,
  TeacherClassOption,
  TeacherSubmissionReportRow,
  UserListRow,
} from '../api/types'
import { apiUrl } from '../lib/apiOrigin'

function AdminParityShell({
  title,
  children,
}: {
  title: string
  children: ReactNode
}) {
  return (
    <div className="container-fluid py-3">
      <div className="mb-4">
        <h2 className="h4 mb-1">{title}</h2>
      </div>
      {children}
    </div>
  )
}

function formatDate(value?: string | null) {
  if (!value) return '—'
  const date = new Date(value)
  return Number.isNaN(date.getTime()) ? value : date.toLocaleDateString()
}

function formatDateInput(value?: string | null) {
  return value ? String(value).slice(0, 10) : ''
}

function monthLabel(value: string) {
  const date = new Date(`${value}T00:00:00`)
  if (Number.isNaN(date.getTime())) return value
  return date.toLocaleString(undefined, { month: 'long', year: 'numeric' })
}

function eventAudienceBadges(row: SchoolCalendarDetailRow | SchoolCalendarEventRow) {
  const props: Record<string, unknown> =
    'extendedProps' in row
      ? { ...(row.extendedProps ?? {}) }
      : {
          notify_parent: (row as SchoolCalendarDetailRow).notify_parent,
          notify_teacher: (row as SchoolCalendarDetailRow).notify_teacher,
          notify_admin: (row as SchoolCalendarDetailRow).notify_admin,
        }
  return [
    props.notify_parent ? 'Parents' : null,
    props.notify_teacher ? 'Teachers' : null,
    props.notify_admin ? 'Admins' : null,
  ].filter(Boolean) as string[]
}

type AttendanceSectionSnapshot = {
  sectionId: string
  classId: number
  className: string
  students: Array<{
    id: number
    schoolId: string
    name: string
    summary: { present: number; late: number; absent: number; total: number }
    entriesByDate: Record<string, { status: string; reason?: string | null }>
  }>
  dates: string[]
}

function buildAttendanceSections(data: Awaited<ReturnType<typeof fetchAdministratorDailyAttendance>>): AttendanceSectionSnapshot[] {
  const grades = data.grades ?? {}
  const studentsBySection = data.students_by_section ?? {}
  const attendanceData = data.attendance_data ?? {}
  const attendanceRecord = data.attendance_record ?? {}
  const datesBySection = data.dates_by_section ?? {}
  const sections: AttendanceSectionSnapshot[] = []

  for (const [classIdKey, sectionRows] of Object.entries(grades)) {
    for (const row of sectionRows ?? []) {
      const sectionId = String(row.class_section_id ?? row.id ?? '')
      if (!sectionId) continue
      const students = (studentsBySection[sectionId] ?? []).map((student) => {
        const studentId = Number(student.id)
        const entries = attendanceData[sectionId]?.[String(studentId)] ?? []
        const summary = attendanceRecord[sectionId]?.[String(studentId)] ?? {}
        return {
          id: studentId,
          schoolId: student.school_id ?? '—',
          name: `${student.firstname ?? ''} ${student.lastname ?? ''}`.trim() || `Student ${studentId}`,
          summary: {
            present: Number(summary.total_presence ?? 0),
            late: Number(summary.total_late ?? 0),
            absent: Number(summary.total_absence ?? 0),
            total: Number(summary.total_attendance ?? 0),
          },
          entriesByDate: Object.fromEntries(
            entries.map((entry) => [
              String(entry.date ?? ''),
              {
                status: String(entry.status ?? ''),
                reason: entry.reason ?? null,
              },
            ]),
          ),
        }
      })

      if (students.length === 0) continue

      sections.push({
        sectionId,
        classId: Number(classIdKey),
        className: row.class_section_name ?? `Section ${sectionId}`,
        students,
        dates: datesBySection[sectionId] ?? [],
      })
    }
  }

  return sections.sort((a, b) => {
    if (a.classId !== b.classId) return a.classId - b.classId
    return a.className.localeCompare(b.className)
  })
}

function buildAttendanceAnalysis(sections: AttendanceSectionSnapshot[]) {
  const overall = { present: 0, late: 0, absent: 0 }
  const byClass = new Map<string, { present: number; late: number; absent: number; totalStudents: number }>()
  const studentsNeedingAttention: Array<{
    name: string
    schoolId: string
    className: string
    absent: number
    late: number
  }> = []

  for (const section of sections) {
    if (!byClass.has(section.className)) {
      byClass.set(section.className, { present: 0, late: 0, absent: 0, totalStudents: section.students.length })
    }
    const bucket = byClass.get(section.className)!

    for (const student of section.students) {
      overall.present += student.summary.present
      overall.late += student.summary.late
      overall.absent += student.summary.absent
      bucket.present += student.summary.present
      bucket.late += student.summary.late
      bucket.absent += student.summary.absent

      if (student.summary.absent > 0 || student.summary.late > 0) {
        studentsNeedingAttention.push({
          name: student.name,
          schoolId: student.schoolId,
          className: section.className,
          absent: student.summary.absent,
          late: student.summary.late,
        })
      }
    }
  }

  studentsNeedingAttention.sort((a, b) => {
    if (b.absent !== a.absent) return b.absent - a.absent
    if (b.late !== a.late) return b.late - a.late
    return a.name.localeCompare(b.name)
  })

  return { overall, byClass: Array.from(byClass.entries()), studentsNeedingAttention }
}

export function AdminBroadcastEmailPage() {
  const [parents, setParents] = useState<BroadcastEmailParentOption[]>([])
  const [fromOptions, setFromOptions] = useState<{ key: string; label: string }[]>([])
  const [selectedIds, setSelectedIds] = useState<number[]>([])
  const [filter, setFilter] = useState('')
  const [loading, setLoading] = useState(true)
  const [submitting, setSubmitting] = useState(false)
  const [message, setMessage] = useState<string | null>(null)
  const [error, setError] = useState<string | null>(null)
  const [form, setForm] = useState({
    from_key: '',
    mode: 'personalized' as 'personalized' | 'standard',
    subject: '',
    body_html: '',
    wrap_layout: true,
    preheader: '',
    cta_text: '',
    cta_url: '',
    test_email: '',
  })

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const data = await fetchBroadcastEmailOptions()
        if (cancelled) return
        setParents(data.parents ?? [])
        setFromOptions(data.fromOptions ?? [])
        setForm((current) => ({
          ...current,
          from_key: current.from_key || data.fromOptions?.[0]?.key || '',
        }))
        setError(null)
      } catch (e) {
        if (!cancelled) {
          setError(e instanceof Error ? e.message : 'Unable to load broadcast email options.')
        }
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [])

  const filteredParents = useMemo(() => {
    const q = filter.trim().toLowerCase()
    if (!q) return parents
    return parents.filter((row) => {
      const haystack = `${row.firstname ?? ''} ${row.lastname ?? ''} ${row.email ?? ''} ${row.school_id ?? ''}`.toLowerCase()
      return haystack.includes(q)
    })
  }, [filter, parents])

  function toggleSelected(id: number) {
    setSelectedIds((current) =>
      current.includes(id) ? current.filter((item) => item !== id) : [...current, id],
    )
  }

  function selectAllFiltered() {
    setSelectedIds(Array.from(new Set([...selectedIds, ...filteredParents.map((row) => row.id)])))
  }

  async function submit(sendTestOnly: boolean) {
    setSubmitting(true)
    setMessage(null)
    setError(null)
    try {
      const result = await sendBroadcastEmail({
        ...form,
        send_test_only: sendTestOnly,
        parent_ids: sendTestOnly ? [] : selectedIds,
      })
      if (!result.ok) {
        setError(result.message ?? 'Broadcast failed.')
      } else {
        setMessage(result.message ?? 'Broadcast sent.')
      }
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Broadcast failed.')
    } finally {
      setSubmitting(false)
    }
  }

  return (
    <AdminParityShell title="Broadcast Email to Parents">
      {message ? <div className="alert alert-success">{message}</div> : null}
      {error ? <div className="alert alert-danger">{error}</div> : null}

      <div className="card mb-3">
        <div className="card-header">Email Details</div>
        <div className="card-body row g-3">
          <div className="col-md-6">
            <label className="form-label">From</label>
            <select
              className="form-select"
              value={form.from_key}
              onChange={(event) => setForm((current) => ({ ...current, from_key: event.target.value }))}
              disabled={loading || submitting}
            >
              {fromOptions.map((option) => (
                <option key={option.key} value={option.key}>
                  {option.label}
                </option>
              ))}
            </select>
          </div>

          <div className="col-md-6">
            <label className="form-label">Send Mode</label>
            <select
              className="form-select"
              value={form.mode}
              onChange={(event) =>
                setForm((current) => ({
                  ...current,
                  mode: event.target.value as 'personalized' | 'standard',
                }))
              }
              disabled={submitting}
            >
              <option value="personalized">Personalized</option>
              <option value="standard">Standard</option>
            </select>
          </div>

          <div className="col-md-8">
            <label className="form-label">Subject</label>
            <input
              className="form-control"
              value={form.subject}
              onChange={(event) => setForm((current) => ({ ...current, subject: event.target.value }))}
              disabled={submitting}
            />
          </div>

          <div className="col-md-4 d-flex align-items-end">
            <div className="form-check">
              <input
                id="wrap_layout"
                className="form-check-input"
                type="checkbox"
                checked={form.wrap_layout}
                onChange={(event) =>
                  setForm((current) => ({ ...current, wrap_layout: event.target.checked }))
                }
                disabled={submitting}
              />
              <label className="form-check-label" htmlFor="wrap_layout">
                Wrap with email layout
              </label>
            </div>
          </div>

          <div className="col-12">
            <label className="form-label">Message (HTML)</label>
            <textarea
              className="form-control"
              rows={10}
              value={form.body_html}
              onChange={(event) => setForm((current) => ({ ...current, body_html: event.target.value }))}
              placeholder="Dear {{name}}, ..."
              disabled={submitting}
            />
          </div>

          <div className="col-md-6">
            <label className="form-label">Preheader</label>
            <input
              className="form-control"
              value={form.preheader}
              onChange={(event) => setForm((current) => ({ ...current, preheader: event.target.value }))}
              disabled={submitting}
            />
          </div>

          <div className="col-md-3">
            <label className="form-label">CTA Text</label>
            <input
              className="form-control"
              value={form.cta_text}
              onChange={(event) => setForm((current) => ({ ...current, cta_text: event.target.value }))}
              disabled={submitting}
            />
          </div>

          <div className="col-md-3">
            <label className="form-label">CTA URL</label>
            <input
              className="form-control"
              value={form.cta_url}
              onChange={(event) => setForm((current) => ({ ...current, cta_url: event.target.value }))}
              disabled={submitting}
            />
          </div>
        </div>
        <div className="card-footer d-flex flex-wrap gap-2 align-items-center">
          <div className="input-group" style={{ maxWidth: 420 }}>
            <span className="input-group-text">Test email</span>
            <input
              className="form-control"
              type="email"
              value={form.test_email}
              onChange={(event) => setForm((current) => ({ ...current, test_email: event.target.value }))}
              disabled={submitting}
            />
            <button
              className="btn btn-outline-primary"
              type="button"
              onClick={() => submit(true)}
              disabled={submitting}
            >
              Send Test Only
            </button>
          </div>
          <span className="ms-auto fw-semibold">Selected: {selectedIds.length}</span>
          <button
            className="btn btn-primary"
            type="button"
            onClick={() => submit(false)}
            disabled={submitting || selectedIds.length === 0}
          >
            Send Broadcast
          </button>
        </div>
      </div>

      <div className="card">
        <div className="card-header d-flex justify-content-between align-items-center gap-2 flex-wrap">
          <span>Parents</span>
          <div className="d-flex gap-2">
            <input
              className="form-control form-control-sm"
              style={{ minWidth: 260 }}
              placeholder="Filter by name, email, school ID"
              value={filter}
              onChange={(event) => setFilter(event.target.value)}
            />
            <button className="btn btn-sm btn-outline-secondary" type="button" onClick={selectAllFiltered}>
              Select Filtered
            </button>
            <button
              className="btn btn-sm btn-outline-secondary"
              type="button"
              onClick={() => setSelectedIds([])}
            >
              Clear
            </button>
          </div>
        </div>
        <div className="card-body p-0">
          <div className="table-responsive">
            <table className="table table-striped table-hover align-middle mb-0">
              <thead className="table-dark">
                <tr>
                  <th style={{ width: 48 }}>#</th>
                  <th>Name</th>
                  <th>Email</th>
                  <th>School ID</th>
                </tr>
              </thead>
              <tbody>
                {loading ? (
                  <tr>
                    <td colSpan={4} className="text-muted">Loading parents…</td>
                  </tr>
                ) : filteredParents.length === 0 ? (
                  <tr>
                    <td colSpan={4} className="text-muted">No parents found.</td>
                  </tr>
                ) : (
                  filteredParents.map((row) => (
                    <tr key={row.id}>
                      <td>
                        <input
                          type="checkbox"
                          className="form-check-input"
                          checked={selectedIds.includes(row.id)}
                          onChange={() => toggleSelected(row.id)}
                        />
                      </td>
                      <td>{`${row.firstname ?? ''} ${row.lastname ?? ''}`.trim() || '—'}</td>
                      <td>{row.email ?? '—'}</td>
                      <td>{row.school_id ?? '—'}</td>
                    </tr>
                  ))
                )}
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

function CalendarEventForm({
  title,
  initial,
  submitLabel,
  onSubmit,
  submitting,
}: {
  title: string
  initial: Partial<SchoolCalendarDetailRow> & {
    event_types?: string[]
    defaults?: { school_year?: string | null; semester?: string | null }
  }
  submitLabel: string
  onSubmit: (payload: Record<string, unknown>) => Promise<void>
  submitting: boolean
}) {
  const navigate = useNavigate()
  const [form, setForm] = useState({
    title: initial.title ?? '',
    description: initial.description ?? '',
    event_type: initial.event_type ?? '',
    date: formatDateInput(initial.date),
    notify_parent: Boolean(initial.notify_parent),
    notify_teacher: Boolean(initial.notify_teacher),
    notify_admin: Boolean(initial.notify_admin),
    no_school: Boolean(initial.no_school),
    send_email_parent: false,
    send_email_teacher: false,
    send_email_admin: false,
    school_year: initial.school_year ?? initial.defaults?.school_year ?? '',
    semester: initial.semester ?? initial.defaults?.semester ?? '',
  })
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    setForm({
      title: initial.title ?? '',
      description: initial.description ?? '',
      event_type: initial.event_type ?? '',
      date: formatDateInput(initial.date),
      notify_parent: Boolean(initial.notify_parent),
      notify_teacher: Boolean(initial.notify_teacher),
      notify_admin: Boolean(initial.notify_admin),
      no_school: Boolean(initial.no_school),
      send_email_parent: false,
      send_email_teacher: false,
      send_email_admin: false,
      school_year: initial.school_year ?? initial.defaults?.school_year ?? '',
      semester: initial.semester ?? initial.defaults?.semester ?? '',
    })
  }, [initial])

  async function handleSubmit(event: FormEvent) {
    event.preventDefault()
    setError(null)
    try {
      await onSubmit(form)
    } catch (e) {
      setError(e instanceof Error ? e.message : `Unable to ${submitLabel.toLowerCase()}.`)
    }
  }

  return (
    <AdminParityShell title={title}>
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <form className="card" onSubmit={handleSubmit}>
        <div className="card-body row g-3">
          <div className="col-12">
            <div className="form-check form-switch mb-2">
              <input
                id="no_school"
                className="form-check-input"
                type="checkbox"
                checked={form.no_school}
                onChange={(event) => setForm((current) => ({ ...current, no_school: event.target.checked }))}
              />
              <label className="form-check-label" htmlFor="no_school">
                No School Day
              </label>
            </div>
            <label className="form-label">Title</label>
            <input
              className="form-control"
              value={form.title}
              onChange={(event) => setForm((current) => ({ ...current, title: event.target.value }))}
              required
            />
          </div>

          <div className="col-12">
            <label className="form-label">Description</label>
            <textarea
              className="form-control"
              rows={4}
              value={form.description}
              onChange={(event) => setForm((current) => ({ ...current, description: event.target.value }))}
            />
          </div>

          <div className="col-md-4">
            <label className="form-label">Event Type</label>
            <select
              className="form-select"
              value={form.event_type}
              onChange={(event) => setForm((current) => ({ ...current, event_type: event.target.value }))}
            >
              <option value="">— Select event type —</option>
              {(initial.event_types ?? []).map((type) => (
                <option key={type} value={type}>
                  {type}
                </option>
              ))}
            </select>
          </div>

          <div className="col-md-4">
            <label className="form-label">Event Date</label>
            <input
              className="form-control"
              type="date"
              value={form.date}
              onChange={(event) => setForm((current) => ({ ...current, date: event.target.value }))}
              required
            />
          </div>

          <div className="col-md-4">
            <label className="form-label">School Year</label>
            <input
              className="form-control"
              value={form.school_year}
              onChange={(event) => setForm((current) => ({ ...current, school_year: event.target.value }))}
            />
          </div>

          <div className="col-md-4">
            <label className="form-label">Semester</label>
            <select
              className="form-select"
              value={form.semester}
              onChange={(event) => setForm((current) => ({ ...current, semester: event.target.value }))}
            >
              <option value="">—</option>
              <option value="Fall">Fall</option>
              <option value="Spring">Spring</option>
            </select>
          </div>

          <div className="col-md-8">
            <label className="form-label d-block">Calendar Display</label>
            <div className="d-flex gap-3 flex-wrap">
              <label className="form-check-label">
                <input
                  className="form-check-input me-1"
                  type="checkbox"
                  checked={form.notify_parent}
                  onChange={(event) =>
                    setForm((current) => ({ ...current, notify_parent: event.target.checked }))
                  }
                />
                Parents
              </label>
              <label className="form-check-label">
                <input
                  className="form-check-input me-1"
                  type="checkbox"
                  checked={form.notify_teacher}
                  onChange={(event) =>
                    setForm((current) => ({ ...current, notify_teacher: event.target.checked }))
                  }
                />
                Teachers
              </label>
              <label className="form-check-label">
                <input
                  className="form-check-input me-1"
                  type="checkbox"
                  checked={form.notify_admin}
                  onChange={(event) =>
                    setForm((current) => ({ ...current, notify_admin: event.target.checked }))
                  }
                />
                Admins
              </label>
            </div>
          </div>

          <div className="col-12">
            <label className="form-label d-block">Email Notifications</label>
            <div className="d-flex gap-3 flex-wrap">
              <label className="form-check-label">
                <input
                  className="form-check-input me-1"
                  type="checkbox"
                  checked={form.send_email_parent}
                  onChange={(event) =>
                    setForm((current) => ({ ...current, send_email_parent: event.target.checked }))
                  }
                />
                Send to Parents
              </label>
              <label className="form-check-label">
                <input
                  className="form-check-input me-1"
                  type="checkbox"
                  checked={form.send_email_teacher}
                  onChange={(event) =>
                    setForm((current) => ({ ...current, send_email_teacher: event.target.checked }))
                  }
                />
                Send to Teachers
              </label>
              <label className="form-check-label">
                <input
                  className="form-check-input me-1"
                  type="checkbox"
                  checked={form.send_email_admin}
                  onChange={(event) =>
                    setForm((current) => ({ ...current, send_email_admin: event.target.checked }))
                  }
                />
                Send to Admins
              </label>
            </div>
          </div>
        </div>
        <div className="card-footer d-flex gap-2 justify-content-end">
          <button type="button" className="btn btn-secondary" onClick={() => navigate('/app/administrator/calendar_view')}>
            Cancel
          </button>
          <button className="btn btn-primary" type="submit" disabled={submitting}>
            {submitLabel}
          </button>
        </div>
      </form>
    </AdminParityShell>
  )
}

export function AdminCalendarAddEventPage() {
  const navigate = useNavigate()
  const [options, setOptions] = useState<{ event_types: string[]; defaults: { school_year?: string | null; semester?: string | null } } | null>(null)
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const data = await fetchSchoolCalendarOptions()
        if (!cancelled) setOptions(data.data ?? null)
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [])

  if (loading && !options) {
    return <AdminParityShell title="Add Event"><p className="text-muted">Loading…</p></AdminParityShell>
  }

  return (
    <CalendarEventForm
      title="Add Event"
      initial={{
        event_types: options?.event_types ?? [],
        defaults: options?.defaults,
      }}
      submitLabel="Add Event"
      submitting={false}
      onSubmit={async (payload) => {
        await createAdministratorCalendarEvent(payload as never)
        navigate('/app/administrator/calendar_view')
      }}
    />
  )
}

export function AdminCalendarEditPage() {
  const navigate = useNavigate()
  const { eventId } = useParams()
  const [options, setOptions] = useState<{ event_types: string[]; defaults: { school_year?: string | null; semester?: string | null } } | null>(null)
  const [event, setEvent] = useState<SchoolCalendarDetailRow | null>(null)
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const [optionsRes, eventRes] = await Promise.all([
          fetchSchoolCalendarOptions(),
          fetchAdministratorCalendarEvent(Number(eventId)),
        ])
        if (cancelled) return
        setOptions(optionsRes.data ?? null)
        setEvent(eventRes.data?.event ?? null)
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [eventId])

  if (loading || !event) {
    return <AdminParityShell title="Edit Event"><p className="text-muted">Loading…</p></AdminParityShell>
  }

  return (
    <CalendarEventForm
      title="Edit Event"
      initial={{
        ...event,
        event_types: options?.event_types ?? [],
        defaults: options?.defaults,
      }}
      submitLabel="Update Event"
      submitting={false}
      onSubmit={async (payload) => {
        await updateAdministratorCalendarEvent(Number(eventId), payload)
        navigate('/app/administrator/calendar_view')
      }}
    />
  )
}

export function AdminCalendarViewPage() {
  const navigate = useNavigate()
  const [searchParams, setSearchParams] = useSearchParams()
  const [events, setEvents] = useState<SchoolCalendarEventRow[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const schoolYear = searchParams.get('school_year') ?? ''
  const semester = searchParams.get('semester') ?? ''

  async function load() {
    setLoading(true)
    try {
      const data = await fetchAdministratorCalendarEvents({
        schoolYear: schoolYear || null,
        semester: semester || null,
      })
      setEvents(data.data?.events ?? [])
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load calendar events.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [schoolYear, semester])

  async function onDelete(eventId: number) {
    if (!window.confirm('Delete this event?')) return
    await deleteAdministratorCalendarEvent(eventId)
    await load()
  }

  return (
    <AdminParityShell title="School Calendar">
      {error ? <div className="alert alert-danger">{error}</div> : null}

      <div className="d-flex gap-2 mb-3 justify-content-end">
        <Link to={`/app/administrator/calendar_add_event${schoolYear || semester ? `?${new URLSearchParams({ ...(schoolYear ? { school_year: schoolYear } : {}), ...(semester ? { semester } : {}) }).toString()}` : ''}`} className="btn btn-success">
          Add New Event
        </Link>
      </div>

      <form
        className="mb-3 d-flex gap-2 justify-content-center align-items-end flex-wrap"
        onSubmit={(event) => {
          event.preventDefault()
          const formData = new FormData(event.currentTarget)
          const next = new URLSearchParams()
          const year = String(formData.get('school_year') ?? '')
          const sem = String(formData.get('semester') ?? '')
          if (year) next.set('school_year', year)
          if (sem) next.set('semester', sem)
          setSearchParams(next)
        }}
      >
        <div>
          <label className="form-label">School Year</label>
          <input name="school_year" className="form-control" defaultValue={schoolYear} />
        </div>
        <div>
          <label className="form-label">Semester</label>
          <select name="semester" className="form-select" defaultValue={semester}>
            <option value="">—</option>
            <option value="Fall">Fall</option>
            <option value="Spring">Spring</option>
          </select>
        </div>
        <div className="d-flex gap-2">
          <button className="btn btn-secondary" type="submit">Apply</button>
          <button className="btn btn-outline-secondary" type="button" onClick={() => setSearchParams(new URLSearchParams())}>
            Reset
          </button>
        </div>
      </form>

      <div className="table-responsive">
        <table className="table table-striped align-middle">
          <thead>
            <tr>
              <th>ID</th>
              <th>Title</th>
              <th>Type</th>
              <th>Description</th>
              <th>Date</th>
              <th>Audience</th>
              <th>Actions</th>
            </tr>
          </thead>
          <tbody>
            {loading ? (
              <tr><td colSpan={7} className="text-muted">Loading events…</td></tr>
            ) : events.length === 0 ? (
              <tr><td colSpan={7} className="text-muted">No events found.</td></tr>
            ) : (
              events.map((row) => (
                <tr key={row.id ?? row.title + row.start}>
                  <td>{row.id ?? '—'}</td>
                  <td>{row.title}</td>
                  <td>{String(row.extendedProps?.event_type ?? '—')}</td>
                  <td>{row.description || '—'}</td>
                  <td>{formatDate(row.start)}</td>
                  <td>{eventAudienceBadges(row).join(', ') || '—'}</td>
                  <td className="d-flex gap-2 flex-wrap">
                    {row.id ? (
                      <>
                        <button className="btn btn-primary btn-sm" type="button" onClick={() => navigate(`/app/administrator/calendar_edit/${row.id}`)}>
                          Edit
                        </button>
                        <button className="btn btn-danger btn-sm" type="button" onClick={() => onDelete(row.id as number)}>
                          Delete
                        </button>
                      </>
                    ) : (
                      <span className="text-muted small">Meeting event</span>
                    )}
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminCalendarPage() {
  const [events, setEvents] = useState<SchoolCalendarEventRow[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const data = await fetchAdministratorCalendarEvents()
        if (cancelled) return
        setEvents(data.data?.events ?? [])
        setError(null)
      } catch (e) {
        if (!cancelled) setError(e instanceof Error ? e.message : 'Unable to load calendar.')
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [])

  const grouped = useMemo(() => {
    const map = new Map<string, SchoolCalendarEventRow[]>()
    for (const row of events) {
      const key = formatDateInput(row.start).slice(0, 7)
      if (!map.has(key)) map.set(key, [])
      map.get(key)?.push(row)
    }
    return Array.from(map.entries())
      .sort(([a], [b]) => a.localeCompare(b))
      .map(([month, rows]) => ({ month, rows }))
  }, [events])

  return (
    <AdminParityShell title="School Calendar">
      <div className="d-flex justify-content-end mb-3">
        <Link to="/app/administrator/calendar_view" className="btn btn-outline-secondary">
          Manage Events
        </Link>
      </div>
      {error ? <div className="alert alert-danger">{error}</div> : null}
      {loading ? (
        <p className="text-muted">Loading calendar…</p>
      ) : grouped.length === 0 ? (
        <p className="text-muted">No calendar events found.</p>
      ) : (
        <div className="row g-3">
          {grouped.map((group) => (
            <div key={group.month} className="col-12 col-xl-6">
              <div className="card h-100">
                <div className="card-header">{monthLabel(`${group.month}-01`)}</div>
                <div className="list-group list-group-flush">
                  {group.rows.map((row) => (
                    <div key={String(row.id ?? row.start + row.title)} className="list-group-item">
                      <div className="d-flex justify-content-between gap-3">
                        <div>
                          <div className="fw-semibold">{row.title}</div>
                          <div className="small text-muted">{formatDate(row.start)}</div>
                          {row.description ? <div className="small mt-1">{row.description}</div> : null}
                        </div>
                        <div className="text-end small text-muted">
                          <div>{String(row.extendedProps?.event_type ?? 'General')}</div>
                          <div>{eventAudienceBadges(row).join(', ') || '—'}</div>
                        </div>
                      </div>
                    </div>
                  ))}
                </div>
              </div>
            </div>
          ))}
        </div>
      )}
    </AdminParityShell>
  )
}

export function AdminClassAssignmentPage() {
  const [assignments, setAssignments] = useState<StudentAssignmentRow[]>([])
  const [classes, setClasses] = useState<StudentAssignmentOption[]>([])
  const [schoolYears, setSchoolYears] = useState<string[]>([])
  const [selectedYear, setSelectedYear] = useState('')
  const [selectedClassByStudent, setSelectedClassByStudent] = useState<Record<number, number>>({})
  const [loading, setLoading] = useState(true)
  const [savingStudentId, setSavingStudentId] = useState<number | null>(null)
  const [message, setMessage] = useState<string | null>(null)
  const [error, setError] = useState<string | null>(null)

  async function load(year?: string | null) {
    setLoading(true)
    try {
      const data = await fetchStudentAssignments(year ?? null)
      setAssignments(data.students ?? [])
      setClasses(data.classes ?? [])
      setSchoolYears(data.schoolYears ?? [])
      setSelectedYear(data.selectedYear ?? '')
      setSelectedClassByStudent(
        Object.fromEntries(
          (data.students ?? []).map((row) => [
            row.student_id,
            Number(row.class_section_ids?.[0] ?? 0),
          ]),
        ),
      )
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load class assignments.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load(null)
  }, [])

  async function saveStudent(studentId: number) {
    const classSectionId = selectedClassByStudent[studentId]
    if (!classSectionId) return
    setSavingStudentId(studentId)
    setMessage(null)
    setError(null)
    try {
      const result = await assignStudentClass({
        student_id: studentId,
        class_section_ids: [classSectionId],
      })
      if (!result.ok) {
        setError(result.message ?? 'Unable to assign class.')
      } else {
        setMessage('Class assignment updated.')
        await load(selectedYear)
      }
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to assign class.')
    } finally {
      setSavingStudentId(null)
    }
  }

  return (
    <AdminParityShell title="Classes Lists">
      {message ? <div className="alert alert-success">{message}</div> : null}
      {error ? <div className="alert alert-danger">{error}</div> : null}

      <form
        className="row g-2 align-items-center justify-content-center mb-3"
        onSubmit={(event) => {
          event.preventDefault()
          void load(selectedYear)
        }}
      >
        <div className="col-auto">
          <label className="form-label mb-0">School year</label>
        </div>
        <div className="col-auto">
          <select
            className="form-select form-select-sm"
            style={{ minWidth: 200 }}
            value={selectedYear}
            onChange={(event) => setSelectedYear(event.target.value)}
          >
            {schoolYears.map((year) => (
              <option key={year} value={year}>
                {year}
              </option>
            ))}
          </select>
        </div>
        <div className="col-auto d-flex gap-2">
          <button type="submit" className="btn btn-secondary btn-sm">Apply</button>
          <button type="button" className="btn btn-outline-secondary btn-sm" onClick={() => void load(null)}>
            Reset
          </button>
        </div>
      </form>

      <div className="table-responsive">
        <table className="table table-striped align-middle">
          <thead>
            <tr>
              <th>Student</th>
              <th>Age</th>
              <th>Registration Grade</th>
              <th>Current Class</th>
              <th>Assign Class</th>
              <th>Contact</th>
              <th>Save</th>
            </tr>
          </thead>
          <tbody>
            {loading ? (
              <tr><td colSpan={7} className="text-muted">Loading assignments…</td></tr>
            ) : assignments.length === 0 ? (
              <tr><td colSpan={7} className="text-muted">No students found.</td></tr>
            ) : (
              assignments.map((row) => (
                <tr key={row.student_id}>
                  <td>{row.name}</td>
                  <td>{row.age ?? '—'}</td>
                  <td>{row.registration_grade ?? '—'}</td>
                  <td>{row.class_section_name ?? 'No class assigned'}</td>
                  <td>
                    <select
                      className="form-select form-select-sm"
                      value={selectedClassByStudent[row.student_id] ?? 0}
                      onChange={(event) =>
                        setSelectedClassByStudent((current) => ({
                          ...current,
                          [row.student_id]: Number(event.target.value),
                        }))
                      }
                    >
                      <option value={0}>Select class</option>
                      {classes.map((section) => (
                        <option key={section.id} value={section.class_section_id}>
                          {section.class_section_name}
                        </option>
                      ))}
                    </select>
                  </td>
                  <td>
                    <div>{row.email || '—'}</div>
                    <div className="small text-muted">{row.phone || '—'}</div>
                  </td>
                  <td>
                    <button
                      className="btn btn-primary btn-sm"
                      type="button"
                      disabled={!selectedClassByStudent[row.student_id] || savingStudentId === row.student_id}
                      onClick={() => void saveStudent(row.student_id)}
                    >
                      {savingStudentId === row.student_id ? 'Saving…' : 'Assign'}
                    </button>
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminClassSectionPage() {
  const [sections, setSections] = useState<ClassSectionRow[]>([])
  const [loading, setLoading] = useState(true)
  const [saving, setSaving] = useState(false)
  const [editingId, setEditingId] = useState<number | null>(null)
  const [error, setError] = useState<string | null>(null)
  const [message, setMessage] = useState<string | null>(null)
  const [search, setSearch] = useState('')
  const [form, setForm] = useState({
    class_id: '',
    class_section_id: '',
    class_section_name: '',
    semester: '',
    school_year: '',
  })

  async function load(searchValue = '') {
    setLoading(true)
    try {
      const data = await fetchClassSections({ search: searchValue || undefined, perPage: 100 })
      setSections(data.data?.sections ?? [])
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load class sections.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load('')
  }, [])

  function startEdit(row: ClassSectionRow) {
    setEditingId(row.id)
    setForm({
      class_id: String(row.class_id ?? ''),
      class_section_id: String(row.class_section_id ?? ''),
      class_section_name: row.class_section_name ?? '',
      semester: row.semester ?? '',
      school_year: row.school_year ?? '',
    })
  }

  function resetForm() {
    setEditingId(null)
    setForm({
      class_id: '',
      class_section_id: '',
      class_section_name: '',
      semester: '',
      school_year: '',
    })
  }

  async function submit(event: FormEvent) {
    event.preventDefault()
    setSaving(true)
    setMessage(null)
    setError(null)
    try {
      const payload = {
        class_id: Number(form.class_id),
        class_section_id: Number(form.class_section_id),
        class_section_name: form.class_section_name,
        semester: form.semester,
        school_year: form.school_year,
      }
      if (editingId) {
        await updateClassSection(editingId, payload)
        setMessage('Class section updated.')
      } else {
        await createClassSection(payload)
        setMessage('Class section created.')
      }
      resetForm()
      await load(search)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to save class section.')
    } finally {
      setSaving(false)
    }
  }

  async function remove(sectionId: number) {
    if (!window.confirm('Delete this class section?')) return
    await deleteClassSection(sectionId)
    await load(search)
  }

  return (
    <AdminParityShell title="Classes">
      {message ? <div className="alert alert-success">{message}</div> : null}
      {error ? <div className="alert alert-danger">{error}</div> : null}

      <div className="card mb-4">
        <div className="card-header">{editingId ? 'Edit Class' : 'Add New Class'}</div>
        <div className="card-body">
          <form className="row g-3" onSubmit={submit}>
            <div className="col-md-3">
              <label className="form-label">Class ID</label>
              <input className="form-control" value={form.class_id} onChange={(event) => setForm((current) => ({ ...current, class_id: event.target.value }))} required />
            </div>
            <div className="col-md-3">
              <label className="form-label">Section ID</label>
              <input className="form-control" value={form.class_section_id} onChange={(event) => setForm((current) => ({ ...current, class_section_id: event.target.value }))} required />
            </div>
            <div className="col-md-3">
              <label className="form-label">Name</label>
              <input className="form-control" value={form.class_section_name} onChange={(event) => setForm((current) => ({ ...current, class_section_name: event.target.value }))} required />
            </div>
            <div className="col-md-1">
              <label className="form-label">Semester</label>
              <input className="form-control" value={form.semester} onChange={(event) => setForm((current) => ({ ...current, semester: event.target.value }))} required />
            </div>
            <div className="col-md-2">
              <label className="form-label">School Year</label>
              <input className="form-control" value={form.school_year} onChange={(event) => setForm((current) => ({ ...current, school_year: event.target.value }))} required />
            </div>
            <div className="col-12 d-flex gap-2 justify-content-end">
              {editingId ? <button type="button" className="btn btn-secondary" onClick={resetForm}>Cancel</button> : null}
              <button className="btn btn-primary" type="submit" disabled={saving}>
                {saving ? 'Saving…' : editingId ? 'Update Class' : 'Create Class'}
              </button>
            </div>
          </form>
        </div>
      </div>

      <div className="d-flex justify-content-end mb-3">
        <div className="input-group" style={{ maxWidth: 340 }}>
          <input className="form-control" value={search} onChange={(event) => setSearch(event.target.value)} placeholder="Search class sections" />
          <button className="btn btn-outline-secondary" type="button" onClick={() => void load(search)}>
            Search
          </button>
        </div>
      </div>

      <div className="table-responsive">
        <table className="table table-striped align-middle">
          <thead>
            <tr>
              <th>ID</th>
              <th>Class ID</th>
              <th>Section ID</th>
              <th>Name</th>
              <th>Semester</th>
              <th>School Year</th>
              <th>Actions</th>
            </tr>
          </thead>
          <tbody>
            {loading ? (
              <tr><td colSpan={7} className="text-muted">Loading classes…</td></tr>
            ) : sections.length === 0 ? (
              <tr><td colSpan={7} className="text-muted">No class sections found.</td></tr>
            ) : (
              sections.map((row) => (
                <tr key={row.id}>
                  <td>{row.id}</td>
                  <td>{row.class_id ?? '—'}</td>
                  <td>{row.class_section_id ?? '—'}</td>
                  <td>{row.class_section_name ?? '—'}</td>
                  <td>{row.semester ?? '—'}</td>
                  <td>{row.school_year ?? '—'}</td>
                  <td className="d-flex gap-2">
                    <button className="btn btn-warning btn-sm" type="button" onClick={() => startEdit(row)}>
                      Edit
                    </button>
                    <button className="btn btn-danger btn-sm" type="button" onClick={() => void remove(row.id)}>
                      Delete
                    </button>
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminDailyAttendancePage() {
  const [data, setData] = useState<Awaited<ReturnType<typeof fetchAdministratorDailyAttendance>> | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [activeSectionId, setActiveSectionId] = useState<string>('')

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const result = await fetchAdministratorDailyAttendance()
        if (cancelled) return
        setData(result)
        const sections = buildAttendanceSections(result)
        setActiveSectionId(sections[0]?.sectionId ?? '')
        setError(null)
      } catch (e) {
        if (!cancelled) setError(e instanceof Error ? e.message : 'Unable to load attendance.')
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [])

  const sections = useMemo(() => (data ? buildAttendanceSections(data) : []), [data])
  const activeSection = sections.find((row) => row.sectionId === activeSectionId) ?? sections[0]
  const visibleDates = activeSection?.dates.slice(-8) ?? []

  return (
    <AdminParityShell title="Attendance Management">
      <div className="d-flex justify-content-end mb-3">
        <Link
          className="btn btn-outline-primary"
          to="/app/administrator/daily_attendance_analysis"
        >
          Attendance Analysis
        </Link>
      </div>
      {error ? <div className="alert alert-danger">{error}</div> : null}
      {loading ? (
        <p className="text-muted">Loading attendance…</p>
      ) : sections.length === 0 ? (
        <p className="text-muted">No attendance sections found.</p>
      ) : (
        <>
          <ul className="nav nav-tabs flex-wrap mb-3">
            {sections.map((section) => (
              <li key={section.sectionId} className="nav-item">
                <button
                  type="button"
                  className={`nav-link ${section.sectionId === activeSection?.sectionId ? 'active' : ''}`}
                  onClick={() => setActiveSectionId(section.sectionId)}
                >
                  {section.className}
                </button>
              </li>
            ))}
          </ul>

          {activeSection ? (
            <div className="table-responsive">
              <table className="table table-bordered table-striped align-middle">
                <thead>
                  <tr>
                    <th>School ID</th>
                    <th>Student Name</th>
                    {visibleDates.map((date) => (
                      <th key={date}>{formatDate(date)}</th>
                    ))}
                    <th>Present</th>
                    <th>Late</th>
                    <th>Absent</th>
                  </tr>
                </thead>
                <tbody>
                  {activeSection.students.map((student) => (
                    <tr key={student.id}>
                      <td>{student.schoolId}</td>
                      <td>{student.name}</td>
                      {visibleDates.map((date) => {
                        const entry = student.entriesByDate[date]
                        return (
                          <td key={date}>
                            <span className={`badge text-bg-${
                              entry?.status === 'present'
                                ? 'success'
                                : entry?.status === 'late'
                                  ? 'warning'
                                  : entry?.status === 'absent'
                                    ? 'danger'
                                    : 'secondary'
                            }`}>
                              {entry?.status ? entry.status : '—'}
                            </span>
                          </td>
                        )
                      })}
                      <td>{student.summary.present}</td>
                      <td>{student.summary.late}</td>
                      <td>{student.summary.absent}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          ) : null}
        </>
      )}
    </AdminParityShell>
  )
}

export function AdminDailyAttendanceAnalysisPage() {
  const [data, setData] = useState<Awaited<ReturnType<typeof fetchAdministratorDailyAttendance>> | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const result = await fetchAdministratorDailyAttendance()
        if (cancelled) return
        setData(result)
        setError(null)
      } catch (e) {
        if (!cancelled) setError(e instanceof Error ? e.message : 'Unable to load attendance analysis.')
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [])

  const sections = useMemo(() => (data ? buildAttendanceSections(data) : []), [data])
  const analysis = useMemo(() => buildAttendanceAnalysis(sections), [sections])
  const total = analysis.overall.present + analysis.overall.late + analysis.overall.absent

  return (
    <AdminParityShell title="Attendance Analysis">
      <div className="d-flex justify-content-end mb-3">
        <Link className="btn btn-outline-secondary" to="/app/administrator/daily_attendance">
          Back to Attendance
        </Link>
      </div>
      {error ? <div className="alert alert-danger">{error}</div> : null}
      {loading ? (
        <p className="text-muted">Loading analysis…</p>
      ) : (
        <div className="row g-3">
          <div className="col-md-4">
            <div className="card h-100">
              <div className="card-body">
                <h5 className="card-title">Overall</h5>
                <p className="mb-2">Present: {analysis.overall.present}</p>
                <p className="mb-2">Late: {analysis.overall.late}</p>
                <p className="mb-0">Absent: {analysis.overall.absent}</p>
                <hr />
                <p className="mb-0 small text-muted">Total attendance marks: {total}</p>
              </div>
            </div>
          </div>

          <div className="col-md-8">
            <div className="card h-100">
              <div className="card-body">
                <h5 className="card-title">By Class</h5>
                <div className="table-responsive">
                  <table className="table table-sm align-middle mb-0">
                    <thead>
                      <tr>
                        <th>Class</th>
                        <th>Students</th>
                        <th>Present</th>
                        <th>Late</th>
                        <th>Absent</th>
                      </tr>
                    </thead>
                    <tbody>
                      {analysis.byClass.map(([className, row]) => (
                        <tr key={className}>
                          <td>{className}</td>
                          <td>{row.totalStudents}</td>
                          <td>{row.present}</td>
                          <td>{row.late}</td>
                          <td>{row.absent}</td>
                        </tr>
                      ))}
                    </tbody>
                  </table>
                </div>
              </div>
            </div>
          </div>

          <div className="col-12">
            <div className="card">
              <div className="card-body">
                <h5 className="card-title">Students Needing Attention</h5>
                <div className="table-responsive">
                  <table className="table table-striped align-middle mb-0">
                    <thead>
                      <tr>
                        <th>Student</th>
                        <th>School ID</th>
                        <th>Class</th>
                        <th>Absent</th>
                        <th>Late</th>
                      </tr>
                    </thead>
                    <tbody>
                      {analysis.studentsNeedingAttention.length === 0 ? (
                        <tr><td colSpan={5} className="text-muted">No absences or tardies recorded.</td></tr>
                      ) : (
                        analysis.studentsNeedingAttention.slice(0, 50).map((student) => (
                          <tr key={`${student.schoolId}-${student.name}`}>
                            <td>{student.name}</td>
                            <td>{student.schoolId}</td>
                            <td>{student.className}</td>
                            <td>{student.absent}</td>
                            <td>{student.late}</td>
                          </tr>
                        ))
                      )}
                    </tbody>
                  </table>
                </div>
              </div>
            </div>
          </div>
        </div>
      )}
    </AdminParityShell>
  )
}

export function AdminExamDraftsPage() {
  const [data, setData] = useState<Awaited<ReturnType<typeof fetchExamDraftAdminData>> | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [message, setMessage] = useState<string | null>(null)
  const [legacyFile, setLegacyFile] = useState<File | null>(null)
  const [legacyForm, setLegacyForm] = useState({
    class_section_id: '',
    school_year: '',
    semester: '',
    exam_type: '',
  })
  const [reviewState, setReviewState] = useState<Record<number, { review_status: string; admin_comments: string; final_file: File | null }>>({})

  async function load() {
    setLoading(true)
    try {
      const result = await fetchExamDraftAdminData()
      setData(result)
      setLegacyForm((current) => ({
        ...current,
        school_year: current.school_year || result.school_year || '',
        semester: current.semester || result.semester || '',
      }))
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load exam drafts.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [])

  async function submitLegacy(event: FormEvent) {
    event.preventDefault()
    if (!legacyFile) return
    try {
      const result = await uploadLegacyExamDraft({
        class_section_id: Number(legacyForm.class_section_id),
        school_year: legacyForm.school_year,
        semester: legacyForm.semester,
        exam_type: legacyForm.exam_type || undefined,
        old_exam_file: legacyFile,
      })
      setMessage(result.message ?? 'Legacy exam uploaded.')
      setLegacyFile(null)
      await load()
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to upload legacy exam.')
    }
  }

  async function submitReview(draft: ExamDraftRow) {
    const row = reviewState[draft.id] ?? { review_status: '', admin_comments: '', final_file: null }
    try {
      const result = await reviewExamDraft({
        draft_id: draft.id,
        review_status: row.review_status || undefined,
        admin_comments: row.admin_comments || undefined,
        final_file: row.final_file,
      })
      setMessage(result.message ?? 'Draft review updated.')
      await load()
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to review draft.')
    }
  }

  const teacherFileUrl = (name?: string | null) => (name ? apiUrl(`/api/v1/files/exams/teacher/${encodeURIComponent(name)}`) : null)
  const finalFileUrl = (name?: string | null) => (name ? apiUrl(`/api/v1/files/exams/final/${encodeURIComponent(name)}`) : null)

  return (
    <AdminParityShell title="Exam Draft Submissions">
      {message ? <div className="alert alert-success">{message}</div> : null}
      {error ? <div className="alert alert-danger">{error}</div> : null}

      <div className="card mb-4">
        <div className="card-header">Upload Legacy Exam</div>
        <div className="card-body">
          <form className="row g-3" onSubmit={submitLegacy}>
            <div className="col-md-3">
              <label className="form-label">Class Section</label>
              <select className="form-select" value={legacyForm.class_section_id} onChange={(event) => setLegacyForm((current) => ({ ...current, class_section_id: event.target.value }))} required>
                <option value="">Select class</option>
                {(data?.class_sections ?? []).map((section) => (
                  <option key={section.class_section_id} value={section.class_section_id}>
                    {section.class_section_name}
                  </option>
                ))}
              </select>
            </div>
            <div className="col-md-2">
              <label className="form-label">School Year</label>
              <input className="form-control" value={legacyForm.school_year} onChange={(event) => setLegacyForm((current) => ({ ...current, school_year: event.target.value }))} required />
            </div>
            <div className="col-md-2">
              <label className="form-label">Semester</label>
              <input className="form-control" value={legacyForm.semester} onChange={(event) => setLegacyForm((current) => ({ ...current, semester: event.target.value }))} required />
            </div>
            <div className="col-md-2">
              <label className="form-label">Exam Type</label>
              <select className="form-select" value={legacyForm.exam_type} onChange={(event) => setLegacyForm((current) => ({ ...current, exam_type: event.target.value }))}>
                <option value="">Legacy Exam</option>
                {(data?.exam_types ?? []).map((type) => <option key={type} value={type}>{type}</option>)}
              </select>
            </div>
            <div className="col-md-3">
              <label className="form-label">File</label>
              <input className="form-control" type="file" accept={(data?.allowed_extensions ?? ['doc','docx','pdf']).map((ext) => `.${ext}`).join(',')} onChange={(event) => setLegacyFile(event.target.files?.[0] ?? null)} required />
            </div>
            <div className="col-12 d-flex justify-content-end">
              <button className="btn btn-primary" type="submit" disabled={!legacyFile}>Upload</button>
            </div>
          </form>
        </div>
      </div>

      <div className="card">
        <div className="card-header">Submissions</div>
        <div className="card-body p-0">
          <div className="table-responsive">
            <table className="table table-striped align-middle mb-0">
              <thead>
                <tr>
                  <th>Teacher</th>
                  <th>Class</th>
                  <th>Title</th>
                  <th>Type</th>
                  <th>Version</th>
                  <th>Status</th>
                  <th>Files</th>
                  <th>Review</th>
                </tr>
              </thead>
              <tbody>
                {loading ? (
                  <tr><td colSpan={8} className="text-muted">Loading drafts…</td></tr>
                ) : (data?.drafts ?? []).length === 0 ? (
                  <tr><td colSpan={8} className="text-muted">No exam drafts found.</td></tr>
                ) : (
                  (data?.drafts ?? []).map((draft) => {
                    const teacherName = `${draft.teacher_first ?? ''} ${draft.teacher_last ?? ''}`.trim() || 'Admin upload'
                    const state = reviewState[draft.id] ?? { review_status: draft.status ?? '', admin_comments: draft.admin_comments ?? '', final_file: null }
                    return (
                      <tr key={draft.id}>
                        <td>{teacherName}</td>
                        <td>{draft.class_section_name ?? '—'}</td>
                        <td>
                          <div className="fw-semibold">{draft.draft_title ?? 'Untitled'}</div>
                          <div className="small text-muted">{draft.description ?? ''}</div>
                        </td>
                        <td>{draft.exam_type ?? '—'}</td>
                        <td>{draft.version ?? 1}</td>
                        <td><span className="badge text-bg-secondary">{draft.status ?? '—'}</span></td>
                        <td>
                          <div className="d-flex flex-column gap-1">
                            {teacherFileUrl(draft.teacher_file) ? <a href={teacherFileUrl(draft.teacher_file)!} target="_blank" rel="noreferrer">Teacher file</a> : null}
                            {finalFileUrl(draft.final_pdf_file ?? draft.final_file) ? <a href={finalFileUrl(draft.final_pdf_file ?? draft.final_file)!} target="_blank" rel="noreferrer">Final file</a> : null}
                          </div>
                        </td>
                        <td style={{ minWidth: 260 }}>
                          <div className="vstack gap-2">
                            <select className="form-select form-select-sm" value={state.review_status} onChange={(event) => setReviewState((current) => ({ ...current, [draft.id]: { ...state, review_status: event.target.value } }))}>
                              <option value="">Select status</option>
                              {(data?.status_options ?? []).map((status) => <option key={status} value={status}>{status}</option>)}
                            </select>
                            <textarea className="form-control form-control-sm" rows={2} value={state.admin_comments} onChange={(event) => setReviewState((current) => ({ ...current, [draft.id]: { ...state, admin_comments: event.target.value } }))} placeholder="Comments" />
                            <input className="form-control form-control-sm" type="file" accept={(data?.allowed_extensions ?? ['doc','docx','pdf']).map((ext) => `.${ext}`).join(',')} onChange={(event) => setReviewState((current) => ({ ...current, [draft.id]: { ...state, final_file: event.target.files?.[0] ?? null } }))} />
                            <button className="btn btn-sm btn-outline-primary" type="button" onClick={() => void submitReview(draft)}>
                              Save Review
                            </button>
                          </div>
                        </td>
                      </tr>
                    )
                  })
                )}
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

export function AdminGradingManagementPage() {
  const [data, setData] = useState<Awaited<ReturnType<typeof fetchGradingOverview>> | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [activeGradeKey, setActiveGradeKey] = useState<string>('')

  useEffect(() => {
    let cancelled = false
    ;(async () => {
      setLoading(true)
      try {
        const result = await fetchGradingOverview()
        if (cancelled) return
        setData(result)
        setActiveGradeKey(Object.keys(result.grades ?? {})[0] ?? '')
        setError(null)
      } catch (e) {
        if (!cancelled) setError(e instanceof Error ? e.message : 'Unable to load grading management.')
      } finally {
        if (!cancelled) setLoading(false)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [])

  const grades = data?.grades ?? {}
  const studentsBySection = data?.students_by_section ?? {}
  const actionTypes = ['homework', 'quiz', 'project', 'midterm', 'final', 'comments']

  return (
    <AdminParityShell title="Score Management">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      {loading ? (
        <p className="text-muted">Loading grading overview…</p>
      ) : Object.keys(grades).length === 0 ? (
        <p className="text-muted">No grading sections found.</p>
      ) : (
        <>
          <ul className="nav nav-tabs justify-content-center flex-wrap">
            {Object.keys(grades).map((classId) => (
              <li key={classId} className="nav-item">
                <button
                  type="button"
                  className={`nav-link ${classId === activeGradeKey ? 'active' : ''}`}
                  onClick={() => setActiveGradeKey(classId)}
                >
                  {Number(classId) === 12 ? 'Youth' : `Grade ${classId}`}
                </button>
              </li>
            ))}
          </ul>

          <div className="mt-4">
            {(grades[activeGradeKey] ?? []).map((section) => {
              const rows: GradingOverviewStudentRow[] = studentsBySection[String(section.class_section_id)] ?? []
              if (rows.length === 0) return null
              return (
                <div key={section.class_section_id} className="mb-4">
                  <h4 className="text-center mt-4">{section.class_section_name}</h4>
                  <div className="table-responsive">
                    <table className="table table-bordered table-striped align-middle">
                      <thead>
                        <tr>
                          <th>Student Name</th>
                          <th>School ID</th>
                          <th>Actions</th>
                        </tr>
                      </thead>
                      <tbody>
                        {rows.map((student) => (
                          <tr key={student.id}>
                            <td>{`${student.firstname ?? ''} ${student.lastname ?? ''}`.trim()}</td>
                            <td>{student.school_id ?? '—'}</td>
                            <td>
                              {actionTypes.map((type) => (
                                <Link
                                  key={type}
                                  className="btn btn-sm btn-outline-primary m-1"
                                  to={`/app/grading/scores/${type}/${section.class_section_id}/${student.id}`}
                                >
                                  {type.charAt(0).toUpperCase() + type.slice(1)}
                                </Link>
                              ))}
                            </td>
                          </tr>
                        ))}
                      </tbody>
                    </table>
                  </div>
                </div>
              )
            })}
          </div>
        </>
      )}
    </AdminParityShell>
  )
}

export function AdminIpBansPage() {
  const [status, setStatus] = useState<'all' | 'active'>('all')
  const [rows, setRows] = useState<Array<Record<string, unknown>>>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  async function load(currentStatus = status) {
    setLoading(true)
    try {
      const data = await fetchIpBans({ status: currentStatus, perPage: 100 })
      setRows((data.data?.bans as Array<Record<string, unknown>>) ?? [])
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load IP bans.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load(status)
  }, [status])

  async function onUnban(id?: number, all = false) {
    await unbanIp(all ? { all: true } : { id })
    await load()
  }

  async function onBan(id?: number) {
    await banIp({ id, hours: 24 })
    await load()
  }

  return (
    <AdminParityShell title="IP Bans">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <div className="d-flex justify-content-between align-items-center mb-3">
        <div className="d-flex align-items-center gap-2">
          <label>Show</label>
          <select className="form-select form-select-sm" style={{ minWidth: 160 }} value={status} onChange={(e) => setStatus(e.target.value as 'all' | 'active')}>
            <option value="all">All entries</option>
            <option value="active">Active bans only</option>
          </select>
        </div>
        <button className="btn btn-danger btn-sm" type="button" onClick={() => void onUnban(undefined, true)}>
          Unban All
        </button>
      </div>
      <div className="table-responsive">
        <table className="table table-striped table-hover align-middle">
          <thead className="table-dark">
            <tr>
              <th>ID</th>
              <th>IP Address</th>
              <th>Attempts</th>
              <th>Last Attempt</th>
              <th>Blocked Until</th>
              <th>Status</th>
              <th>Created</th>
              <th>Updated</th>
              <th>Actions</th>
            </tr>
          </thead>
          <tbody>
            {loading ? (
              <tr><td colSpan={9} className="text-muted">Loading IP bans…</td></tr>
            ) : rows.length === 0 ? (
              <tr><td colSpan={9} className="text-muted">No IP ban records found.</td></tr>
            ) : rows.map((row) => {
              const id = Number(row.id ?? 0)
              const active = Boolean(row.is_active)
              return (
                <tr key={id}>
                  <td>{id}</td>
                  <td>{String(row.ip_address ?? '—')}</td>
                  <td>{String(row.attempts ?? 0)}</td>
                  <td>{formatDate(String(row.last_attempt_at ?? ''))}</td>
                  <td>{formatDate(String(row.blocked_until ?? ''))}</td>
                  <td><span className={`badge ${active ? 'bg-danger' : 'bg-secondary'}`}>{active ? 'Active' : 'Not Active'}</span></td>
                  <td>{formatDate(String(row.created_at ?? ''))}</td>
                  <td>{formatDate(String(row.updated_at ?? ''))}</td>
                  <td className="d-flex gap-2">
                    {active ? (
                      <button className="btn btn-sm btn-primary" type="button" onClick={() => void onUnban(id)}>
                        Unban
                      </button>
                    ) : (
                      <>
                        <button className="btn btn-sm btn-warning" type="button" onClick={() => void onBan(id)}>
                          Ban 24h
                        </button>
                        <button className="btn btn-sm btn-secondary" type="button" onClick={() => void onUnban(id)}>
                          Clear Attempts
                        </button>
                      </>
                    )}
                  </td>
                </tr>
              )
            })}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminLateSlipLogsPage() {
  const [filters, setFilters] = useState({ schoolYear: '', semester: '', q: '', dateFrom: '', dateTo: '' })
  const [rows, setRows] = useState<Array<Record<string, unknown>>>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  async function load() {
    setLoading(true)
    try {
      const data = await fetchLateSlipLogs({ ...filters, perPage: 100 })
      setRows((data.data?.logs as Array<Record<string, unknown>>) ?? [])
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load late slip logs.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [])

  return (
    <AdminParityShell title="Late Slip Logs">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <form className="row g-2 align-items-end mb-3" onSubmit={(e) => { e.preventDefault(); void load() }}>
        <div className="col-auto"><label className="form-label">School Year</label><input className="form-control" value={filters.schoolYear} onChange={(e) => setFilters((c) => ({ ...c, schoolYear: e.target.value }))} /></div>
        <div className="col-auto"><label className="form-label">Semester</label><select className="form-select" value={filters.semester} onChange={(e) => setFilters((c) => ({ ...c, semester: e.target.value }))}><option value="">—</option><option value="Fall">Fall</option><option value="Spring">Spring</option></select></div>
        <div className="col-auto"><label className="form-label">Student</label><input className="form-control" value={filters.q} onChange={(e) => setFilters((c) => ({ ...c, q: e.target.value }))} /></div>
        <div className="col-auto"><label className="form-label">From</label><input type="date" className="form-control" value={filters.dateFrom} onChange={(e) => setFilters((c) => ({ ...c, dateFrom: e.target.value }))} /></div>
        <div className="col-auto"><label className="form-label">To</label><input type="date" className="form-control" value={filters.dateTo} onChange={(e) => setFilters((c) => ({ ...c, dateTo: e.target.value }))} /></div>
        <div className="col-auto d-flex gap-2"><button className="btn btn-primary" type="submit">Filter</button><button className="btn btn-secondary" type="button" onClick={() => { setFilters({ schoolYear: '', semester: '', q: '', dateFrom: '', dateTo: '' }); }}>Reset</button></div>
      </form>
      <div className="table-responsive">
        <table className="table table-striped align-middle">
          <thead><tr><th>ID</th><th>Printed At</th><th>Student</th><th>Grade</th><th>Date</th><th>Time In</th><th>Reason</th><th>School Year</th><th>Admin</th><th>Action</th></tr></thead>
          <tbody>
            {loading ? <tr><td colSpan={10} className="text-muted">Loading logs…</td></tr> : rows.length === 0 ? <tr><td colSpan={10} className="text-muted">No late slip logs found.</td></tr> : rows.map((row) => (
              <tr key={String(row.id ?? '')}>
                <td>{String(row.id ?? '')}</td>
                <td>{formatDate(String(row.printed_at ?? ''))}</td>
                <td>{String(row.student_name ?? '—')}</td>
                <td>{String(row.grade ?? '—')}</td>
                <td>{formatDate(String(row.slip_date ?? ''))}</td>
                <td>{String(row.time_in ?? '—')}</td>
                <td>{String(row.reason ?? '—')}</td>
                <td>{String(row.school_year ?? '—')}</td>
                <td>{String(row.admin_name ?? '—')}</td>
                <td><button className="btn btn-sm btn-outline-danger" type="button" onClick={() => void deleteLateSlipLog(Number(row.id)).then(load)}>Delete</button></td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminManageUsersPage() {
  const [rows, setRows] = useState<UserListRow[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  async function load() {
    setLoading(true)
    try {
      const data = await fetchUsers({ sort: 'lastname', order: 'asc' })
      setRows(data.users ?? [])
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load users.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => { void load() }, [])

  return (
    <AdminParityShell title="Manage Users">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <div className="table-responsive">
        <table className="table table-bordered mt-3 align-middle">
          <thead><tr><th>ID</th><th>Name</th><th>Email</th><th>Role</th><th>Actions</th></tr></thead>
          <tbody>
            {loading ? <tr><td colSpan={5} className="text-muted">Loading users…</td></tr> : rows.length === 0 ? <tr><td colSpan={5} className="text-muted">No users found.</td></tr> : rows.map((row) => {
              const user = row.user ?? {}
              const id = Number(user.id ?? 0)
              const name = `${String(user.firstname ?? '')} ${String(user.lastname ?? '')}`.trim()
              return (
                <tr key={id}>
                  <td>{id}</td>
                  <td>{name || '—'}</td>
                  <td>{String(user.email ?? '—')}</td>
                  <td>{(row.roles ?? []).map((r) => String(r.name ?? '')).filter(Boolean).join(', ') || '—'}</td>
                  <td><button className="btn btn-sm btn-danger" type="button" onClick={() => void deleteUser(id).then(load)}>Delete</button></td>
                </tr>
              )
            })}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

function AdminNotificationMatrix({
  title,
  admins,
  columns,
  checkedMap,
  onSave,
  tableReady,
}: {
  title: string
  admins: NotificationAdminRow[]
  columns: Array<{ key: string; label: string }>
  checkedMap: Record<string, Record<string, boolean>>
  onSave: (value: Record<string, Record<string, boolean>>) => Promise<void>
  tableReady: boolean
}) {
  const [state, setState] = useState(checkedMap)
  useEffect(() => setState(checkedMap), [checkedMap])
  return (
    <AdminParityShell title={title}>
      {!tableReady ? <div className="alert alert-warning">Notification subject storage is not available.</div> : null}
      <div className="card">
        <div className="card-header d-flex justify-content-between"><span>Admins</span><button className="btn btn-primary btn-sm" type="button" disabled={!tableReady} onClick={() => void onSave(state)}>Save</button></div>
        <div className="card-body p-0">
          <div className="table-responsive">
            <table className="table table-striped align-middle mb-0">
              <thead className="table-dark"><tr><th>#</th><th>Name</th><th>Email</th>{columns.map((c) => <th key={c.key} className="text-center">{c.label}</th>)}</tr></thead>
              <tbody>
                {admins.length === 0 ? <tr><td colSpan={3 + columns.length} className="text-center text-muted">No admins found.</td></tr> : admins.map((admin, index) => {
                  const id = String(admin.id)
                  return (
                    <tr key={id}>
                      <td>{index + 1}</td>
                      <td>{`${admin.firstname ?? ''} ${admin.lastname ?? ''}`.trim() || `Admin #${id}`}</td>
                      <td>{admin.email ?? ''}</td>
                      {columns.map((c) => (
                        <td key={c.key} className="text-center">
                          <input className="form-check-input" type="checkbox" checked={Boolean(state[id]?.[c.key])} disabled={!tableReady} onChange={(e) => setState((current) => ({ ...current, [id]: { ...(current[id] ?? {}), [c.key]: e.target.checked } }))} />
                        </td>
                      ))}
                    </tr>
                  )
                })}
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

export function AdminNotificationsAlertsPage() {
  const [admins, setAdmins] = useState<NotificationAdminRow[]>([])
  const [subjects, setSubjects] = useState<Record<string, string>>({})
  const [assigned, setAssigned] = useState<Record<string, Record<string, boolean>>>({})
  const [tableReady, setTableReady] = useState(false)

  useEffect(() => {
    ;(async () => {
      const data = await fetchNotificationAlerts()
      setAdmins(data.admins ?? [])
      setSubjects(data.subjects ?? {})
      setAssigned(data.assignedSubjects ?? {})
      setTableReady(Boolean(data.tableReady))
    })()
  }, [])

  return (
    <AdminNotificationMatrix
      title="Admin Notification Subjects"
      admins={admins}
      columns={Object.entries(subjects).map(([key, label]) => ({ key, label }))}
      checkedMap={assigned}
      tableReady={tableReady}
      onSave={async (value) => {
        const payload: Record<string, string[]> = {}
        for (const [adminId, map] of Object.entries(value)) {
          payload[adminId] = Object.entries(map).filter(([, checked]) => checked).map(([key]) => key)
        }
        await saveNotificationAlerts(payload)
      }}
    />
  )
}

export function AdminPrintNotificationAdminsPage() {
  const [admins, setAdmins] = useState<NotificationAdminRow[]>([])
  const [assigned, setAssigned] = useState<Record<string, boolean>>({})
  const [tableReady, setTableReady] = useState(false)

  useEffect(() => {
    ;(async () => {
      const data = await fetchPrintNotificationRecipients()
      setAdmins(data.admins ?? [])
      setAssigned(data.assigned ?? {})
      setTableReady(Boolean(data.tableReady))
    })()
  }, [])

  return (
    <AdminNotificationMatrix
      title="Print Notification Recipients"
      admins={admins}
      columns={[{ key: 'print_requests', label: 'Send Print Alerts' }]}
      checkedMap={Object.fromEntries(Object.entries(assigned).map(([id, checked]) => [id, { print_requests: checked }]))}
      tableReady={tableReady}
      onSave={async (value) => {
        const payload: Record<string, number> = {}
        for (const [adminId, map] of Object.entries(value)) {
          if (map.print_requests) payload[adminId] = 1
        }
        await savePrintNotificationRecipients(payload)
      }}
    />
  )
}

export function AdminParentProfilePage() {
  const [guardians, setGuardians] = useState<NotificationAdminRow[]>([])
  const [selectedGuardianId, setSelectedGuardianId] = useState<number | null>(null)
  const [families, setFamilies] = useState<Array<Record<string, unknown>>>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  useEffect(() => {
    ;(async () => {
      setLoading(true)
      try {
        const data = await fetchFamilyAdminIndex()
        setGuardians(data.data?.searchGuardians ?? [])
        setFamilies((data.data?.families as Array<Record<string, unknown>>) ?? [])
        setError(null)
      } catch (e) {
        setError(e instanceof Error ? e.message : 'Unable to load parent profiles.')
      } finally {
        setLoading(false)
      }
    })()
  }, [])

  async function loadGuardian(guardianId: number) {
    setSelectedGuardianId(guardianId)
    const data = await fetchFamilyAdminIndex({ guardianId })
    setFamilies((data.data?.families as Array<Record<string, unknown>>) ?? [])
  }

  return (
    <AdminParityShell title="Parent Profiles">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <div className="row g-3">
        <div className="col-lg-4">
          <div className="card">
            <div className="card-header">Guardians</div>
            <div className="list-group list-group-flush" style={{ maxHeight: 520, overflow: 'auto' }}>
              {loading ? <div className="list-group-item text-muted">Loading guardians…</div> : guardians.map((guardian) => (
                <button key={guardian.id} type="button" className={`list-group-item list-group-item-action ${selectedGuardianId === guardian.id ? 'active' : ''}`} onClick={() => void loadGuardian(guardian.id)}>
                  <div>{`${guardian.firstname ?? ''} ${guardian.lastname ?? ''}`.trim()}</div>
                  <div className="small">{guardian.email ?? ''}</div>
                </button>
              ))}
            </div>
          </div>
        </div>
        <div className="col-lg-8">
          <div className="card">
            <div className="card-header">Families</div>
            <div className="card-body">
              {families.length === 0 ? <p className="text-muted mb-0">Select a guardian to view family details.</p> : families.map((family) => (
                <div key={String(family.id ?? '')} className="border rounded p-3 mb-3">
                  <h5 className="mb-1">{String(family.household_name ?? 'Household')}</h5>
                  <div className="small text-muted mb-2">{String(family.address_line1 ?? '')} {String(family.city ?? '')} {String(family.state ?? '')}</div>
                  <div className="mb-2"><strong>Phone:</strong> {String(family.primary_phone ?? '—')}</div>
                  <div><strong>Students</strong></div>
                  <ul className="mb-0">
                    {Array.isArray(family.students) && family.students.length > 0 ? family.students.map((student, idx) => (
                      <li key={idx}>{`${String(student.firstname ?? '')} ${String(student.lastname ?? '')}`.trim()} {student.class_section_name ? `(${String(student.class_section_name)})` : ''}</li>
                    )) : <li className="text-muted">No students linked.</li>}
                  </ul>
                </div>
              ))}
            </div>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

export function AdminPaypalTransactionsPage() {
  const [q, setQ] = useState('')
  const [rows, setRows] = useState<Array<Record<string, unknown>>>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  async function load(query = q) {
    setLoading(true)
    try {
      const data = await fetchPaypalTransactions({ q: query || undefined, perPage: 100 })
      setRows((data.transactions as Array<Record<string, unknown>>) ?? [])
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load PayPal transactions.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => { void load('') }, [])

  async function exportCsv() {
    const blob = await fetchPaypalTransactionsCsv({ q: q || undefined })
    const url = URL.createObjectURL(blob)
    const anchor = document.createElement('a')
    anchor.href = url
    anchor.download = 'paypal_transactions.csv'
    anchor.click()
    URL.revokeObjectURL(url)
  }

  return (
    <AdminParityShell title="PayPal Transactions">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <div className="d-flex gap-2 mb-3 justify-content-end">
        <input className="form-control" style={{ maxWidth: 320 }} placeholder="Search transactions" value={q} onChange={(e) => setQ(e.target.value)} />
        <button className="btn btn-primary" type="button" onClick={() => void load()}>Search</button>
        <button className="btn btn-success" type="button" onClick={() => void exportCsv()}>Export CSV</button>
      </div>
      <div className="table-responsive">
        <table className="table table-striped align-middle">
          <thead><tr><th>ID</th><th>Transaction ID</th><th>Order ID</th><th>Parent School ID</th><th>Email</th><th>Amount</th><th>Net Amount</th><th>Currency</th><th>Status</th><th>Event Type</th><th>Date</th></tr></thead>
          <tbody>
            {loading ? <tr><td colSpan={11} className="text-muted">Loading transactions…</td></tr> : rows.length === 0 ? <tr><td colSpan={11} className="text-muted">No transactions found.</td></tr> : rows.map((row) => (
              <tr key={String(row.id ?? '')}>
                <td>{String(row.id ?? '')}</td>
                <td>{String(row.transaction_id ?? '—')}</td>
                <td>{String(row.order_id ?? '—')}</td>
                <td>{String(row.parent_school_id ?? '—')}</td>
                <td>{String(row.payer_email ?? '—')}</td>
                <td>{Number(row.amount ?? 0).toFixed(2)}</td>
                <td>{Number(row.net_amount ?? 0).toFixed(2)}</td>
                <td>{String(row.currency ?? '—')}</td>
                <td>{String(row.status ?? '—')}</td>
                <td>{String(row.event_type ?? '—')}</td>
                <td>{formatDate(String(row.created_at ?? ''))}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

function submissionBadgeClass(status?: string | null) {
  const normalized = String(status ?? '').toLowerCase()
  if (normalized === 'submitted') return 'bg-success'
  if (normalized === 'partial') return 'bg-warning text-dark'
  return 'bg-secondary'
}

export function AdminRemovedStudentsPage() {
  const [schoolYear, setSchoolYear] = useState('')
  const [activeStudents, setActiveStudents] = useState<RemovedStudentRow[]>([])
  const [removedStudents, setRemovedStudents] = useState<RemovedStudentRow[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  async function load(year = schoolYear) {
    setLoading(true)
    try {
      const data = await fetchRemovedStudents(year || undefined)
      setActiveStudents(data.active_students ?? [])
      setRemovedStudents(data.removed_students ?? [])
      setSchoolYear(data.school_year ?? year ?? '')
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load removed students.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [])

  async function toggleStudent(studentId: number, isActive: boolean) {
    await setStudentActive({ student_id: studentId, is_active: isActive })
    await load()
  }

  return (
    <AdminParityShell title="Student Removal">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <form className="row g-2 align-items-end mb-3" onSubmit={(e) => { e.preventDefault(); void load() }}>
        <div className="col-sm-4 col-lg-3">
          <label className="form-label">School Year</label>
          <input className="form-control" value={schoolYear} onChange={(e) => setSchoolYear(e.target.value)} placeholder="2025-2026" />
        </div>
        <div className="col-auto">
          <button className="btn btn-primary" type="submit">Apply</button>
        </div>
      </form>
      <div className="row g-4">
        <div className="col-xl-6">
          <div className="card shadow-sm">
            <div className="card-header d-flex justify-content-between align-items-center">
              <span>Active Students</span>
              <span className="badge bg-primary">{activeStudents.length}</span>
            </div>
            <div className="table-responsive">
              <table className="table table-striped table-hover align-middle mb-0">
                <thead className="table-dark">
                  <tr><th>School ID</th><th>First Name</th><th>Last Name</th><th>Class</th><th>Action</th></tr>
                </thead>
                <tbody>
                  {loading ? <tr><td colSpan={5} className="text-muted">Loading students…</td></tr> : activeStudents.length === 0 ? <tr><td colSpan={5} className="text-muted">No active students found.</td></tr> : activeStudents.map((student) => (
                    <tr key={student.id}>
                      <td>{student.school_id ?? '—'}</td>
                      <td>{student.firstname ?? '—'}</td>
                      <td>{student.lastname ?? '—'}</td>
                      <td>{student.class_section_name ?? 'No class assigned'}</td>
                      <td><button className="btn btn-outline-danger btn-sm" type="button" onClick={() => void toggleStudent(student.id, false)}>Remove</button></td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </div>
        </div>
        <div className="col-xl-6">
          <div className="card shadow-sm">
            <div className="card-header d-flex justify-content-between align-items-center">
              <span>Removed Students</span>
              <span className="badge bg-secondary">{removedStudents.length}</span>
            </div>
            <div className="table-responsive">
              <table className="table table-striped table-hover align-middle mb-0">
                <thead className="table-dark">
                  <tr><th>School ID</th><th>First Name</th><th>Last Name</th><th>Last Class</th><th>Action</th></tr>
                </thead>
                <tbody>
                  {loading ? <tr><td colSpan={5} className="text-muted">Loading students…</td></tr> : removedStudents.length === 0 ? <tr><td colSpan={5} className="text-muted">No removed students found.</td></tr> : removedStudents.map((student) => (
                    <tr key={student.id}>
                      <td>{student.school_id ?? '—'}</td>
                      <td>{student.firstname ?? '—'}</td>
                      <td>{student.lastname ?? '—'}</td>
                      <td>{student.class_section_name ?? 'No class assigned'}</td>
                      <td><button className="btn btn-outline-success btn-sm" type="button" onClick={() => void toggleStudent(student.id, true)}>Restore</button></td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

export function AdminSearchResultsPage() {
  const [searchParams, setSearchParams] = useSearchParams()
  const initialQuery = searchParams.get('query') ?? ''
  const [query, setQuery] = useState(initialQuery)
  const [result, setResult] = useState<AdministratorDashboardSearchResponse | null>(null)
  const [loading, setLoading] = useState(Boolean(initialQuery))
  const [error, setError] = useState<string | null>(null)

  async function runSearch(value: string) {
    const trimmed = value.trim()
    if (!trimmed) {
      setResult(null)
      setSearchParams({})
      return
    }
    setLoading(true)
    try {
      const data = await searchAdministratorDashboard(trimmed)
      setResult(data)
      setSearchParams({ query: trimmed })
      setError(null)
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Unable to load search results.')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    if (initialQuery) void runSearch(initialQuery)
  }, [])

  const groups = [
    { key: 'users', label: 'Users' },
    { key: 'students', label: 'Students' },
    { key: 'parents', label: 'Parents' },
    { key: 'staff', label: 'Staff' },
    { key: 'emergency_contacts', label: 'Emergency Contacts' },
  ] as const

  return (
    <AdminParityShell title="Search Results">
      {error ? <div className="alert alert-danger">{error}</div> : null}
      <form className="d-flex gap-2 mb-4" onSubmit={(e) => { e.preventDefault(); void runSearch(query) }}>
        <input className="form-control" value={query} onChange={(e) => setQuery(e.target.value)} placeholder="Enter search term" required />
        <button className="btn btn-primary" type="submit">Search</button>
      </form>
      {!result && !loading ? <p className="text-muted mb-0">Enter a search term to view results.</p> : null}
      {loading ? <p className="text-muted">Loading search results…</p> : null}
      {result && groups.map((group) => {
        const rows = result.results?.[group.key] ?? []
        if (!rows || rows.length === 0) return null
        const columns = Array.from(new Set(rows.flatMap((row) => Object.keys(row))))
        return (
          <div key={group.key} className="card shadow-sm mb-4">
            <div className="card-header">{group.label}</div>
            <div className="table-responsive">
              <table className="table table-bordered table-sm align-middle mb-0">
                <thead className="table-light">
                  <tr>{columns.map((column) => <th key={column}>{column.replace(/_/g, ' ')}</th>)}</tr>
                </thead>
                <tbody>
                  {rows.map((row, index) => (
                    <tr key={`${group.key}-${index}`}>
                      {columns.map((column) => <td key={column}>{String(row[column] ?? '—')}</td>)}
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </div>
        )
      })}
      {result && groups.every((group) => (result.results?.[group.key] ?? []).length === 0) ? (
        <p className="text-muted">No results found.</p>
      ) : null}
    </AdminParityShell>
  )
}

export function AdminSectionsAutoDistributePage() {
  const [schoolYear, setSchoolYear] = useState('')
  const [studentsPerSection, setStudentsPerSection] = useState(20)
  const [rows, setRows] = useState<StudentPromotionTotalsRow[]>([])
  const [loading, setLoading] = useState(true)
  const [message, setMessage] = useState<string | null>(null)
  const [distribution, setDistribution] = useState<Record<string, string[]>>({})

  async function load(year = schoolYear) {
    setLoading(true)
    try {
      const data = await fetchStudentPromotionTotals(year || undefined)
      setRows(data.rows ?? [])
      setSchoolYear(data.year ?? year ?? '')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [])

  async function runDistribution(row: StudentPromotionTotalsRow) {
    const response = await autoDistributeStudents({
      class_id: row.class_id ?? undefined,
      class_section_id: row.class_section_id ?? undefined,
      students_per_section: studentsPerSection,
      school_year: schoolYear || undefined,
    })
    const sections = (response.data?.sections ?? []).map((section) => {
      const name = String(section.class_section_name ?? 'Section')
      const total = Number(section.total ?? 0)
      return `${name}: ${total}`
    })
    setDistribution((current) => ({ ...current, [String(row.class_section_id ?? row.class_id ?? '')]: sections }))
    setMessage(response.message ?? 'Distribution completed.')
  }

  async function runAll() {
    for (const row of rows) {
      // eslint-disable-next-line no-await-in-loop
      await runDistribution(row)
    }
  }

  return (
    <AdminParityShell title="Auto-Distribute Students into Sections">
      {message ? <div className="alert alert-info">{message}</div> : null}
      <div className="row g-2 align-items-end mb-3">
        <div className="col-sm-4 col-lg-3">
          <label className="form-label">School Year</label>
          <input className="form-control" value={schoolYear} onChange={(e) => setSchoolYear(e.target.value)} />
        </div>
        <div className="col-sm-4 col-lg-3">
          <label className="form-label">Students per section</label>
          <input type="number" min={1} className="form-control" value={studentsPerSection} onChange={(e) => setStudentsPerSection(Number(e.target.value) || 1)} />
        </div>
        <div className="col-auto"><button className="btn btn-outline-secondary" type="button" onClick={() => void load()}>Refresh Totals</button></div>
        <div className="col-auto"><button className="btn btn-primary" type="button" onClick={() => void runAll()} disabled={rows.length === 0}>Generate All</button></div>
      </div>
      <div className="table-responsive">
        <table className="table table-sm table-striped align-middle">
          <thead className="table-light">
            <tr><th>Class</th><th>Total</th><th>Sections Needed</th><th>Generated Sections</th><th>Actions</th></tr>
          </thead>
          <tbody>
            {loading ? <tr><td colSpan={5} className="text-muted">Loading totals…</td></tr> : rows.length === 0 ? <tr><td colSpan={5} className="text-muted">No section totals found.</td></tr> : rows.map((row) => {
              const total = Number(row.total ?? 0)
              const needed = studentsPerSection > 0 ? Math.ceil(total / studentsPerSection) : 0
              const key = String(row.class_section_id ?? row.class_id ?? '')
              return (
                <tr key={key}>
                  <td>{row.class_section_name ?? '—'}</td>
                  <td>{total}</td>
                  <td>{needed || '—'}</td>
                  <td>{distribution[key]?.join(', ') ?? '—'}</td>
                  <td><button className="btn btn-sm btn-primary" type="button" onClick={() => void runDistribution(row)}>Generate Sections</button></td>
                </tr>
              )
            })}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminStudentClassAssignmentPage() {
  const [schoolYear, setSchoolYear] = useState('')
  const [students, setStudents] = useState<StudentAssignmentRow[]>([])
  const [classes, setClasses] = useState<StudentAssignmentOption[]>([])
  const [selectedStudentId, setSelectedStudentId] = useState<number | null>(null)
  const [selectedClassIds, setSelectedClassIds] = useState<number[]>([])
  const [eventOnly, setEventOnly] = useState(false)
  const [loading, setLoading] = useState(true)
  const [message, setMessage] = useState<string | null>(null)

  async function load(year = schoolYear) {
    setLoading(true)
    try {
      const data = await fetchStudentAssignments(year || undefined)
      setStudents(data.students ?? [])
      setClasses(data.classes ?? [])
      setSchoolYear(data.selectedYear ?? year ?? '')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [])

  async function submitAssignment() {
    if (!selectedStudentId || selectedClassIds.length === 0) return
    const result = await assignStudentClass({
      student_id: selectedStudentId,
      class_section_id: selectedClassIds,
      is_event_only: eventOnly,
    })
    setMessage(result.message ?? 'Classes assigned successfully.')
    setSelectedStudentId(null)
    setSelectedClassIds([])
    setEventOnly(false)
    await load()
  }

  async function removeAssignment(studentId: number, classSectionId: number) {
    const result = await removeStudentClass({ student_id: studentId, class_section_id: classSectionId })
    setMessage(result.message ?? 'Class removed successfully.')
    await load()
  }

  return (
    <AdminParityShell title="Student Class Assignment">
      {message ? <div className="alert alert-info">{message}</div> : null}
      <div className="row g-3 mb-4">
        <div className="col-lg-4">
          <label className="form-label">School Year</label>
          <div className="d-flex gap-2">
            <input className="form-control" value={schoolYear} onChange={(e) => setSchoolYear(e.target.value)} />
            <button className="btn btn-outline-secondary" type="button" onClick={() => void load()}>Apply</button>
          </div>
        </div>
        <div className="col-lg-8">
          <div className="card shadow-sm">
            <div className="card-body row g-2 align-items-end">
              <div className="col-md-4">
                <label className="form-label">Student</label>
                <select className="form-select" value={selectedStudentId ?? ''} onChange={(e) => setSelectedStudentId(e.target.value ? Number(e.target.value) : null)}>
                  <option value="">Select student…</option>
                  {students.map((student) => <option key={student.student_id} value={student.student_id}>{student.name}</option>)}
                </select>
              </div>
              <div className="col-md-5">
                <label className="form-label">Class(es)</label>
                <select
                  className="form-select"
                  multiple
                  size={6}
                  value={selectedClassIds.map(String)}
                  onChange={(e) => setSelectedClassIds(Array.from(e.target.selectedOptions).map((option) => Number(option.value)))}
                >
                  {classes.map((classRow) => <option key={classRow.class_section_id} value={classRow.class_section_id}>{classRow.class_section_name}</option>)}
                </select>
              </div>
              <div className="col-md-3">
                <div className="form-check mb-2">
                  <input id="eventOnly" className="form-check-input" type="checkbox" checked={eventOnly} onChange={(e) => setEventOnly(e.target.checked)} />
                  <label className="form-check-label" htmlFor="eventOnly">Event class only</label>
                </div>
                <button className="btn btn-primary w-100" type="button" onClick={() => void submitAssignment()} disabled={!selectedStudentId || selectedClassIds.length === 0}>Assign Class</button>
              </div>
            </div>
          </div>
        </div>
      </div>
      <div className="table-responsive">
        <table className="table table-striped table-hover align-middle">
          <thead className="table-dark">
            <tr><th>Student Name</th><th>Age</th><th>Registration Grade</th><th>New Student</th><th>Assigned Classes</th><th>Registration Date</th><th>School Year</th></tr>
          </thead>
          <tbody>
            {loading ? <tr><td colSpan={7} className="text-muted">Loading students…</td></tr> : students.length === 0 ? <tr><td colSpan={7} className="text-muted">No students found.</td></tr> : students.map((student) => (
              <tr key={student.student_id}>
                <td>{student.name}</td>
                <td>{student.age ?? '—'}</td>
                <td>{student.registration_grade ?? '—'}</td>
                <td>{student.new_student ?? '—'}</td>
                <td>
                  {student.class_section_ids && student.class_section_ids.length > 0 ? (
                    <div className="d-flex flex-wrap gap-2">
                      {student.class_section_ids.map((classId, index) => (
                        <span key={`${student.student_id}-${classId}`} className="badge bg-success d-inline-flex align-items-center gap-2">
                          <span>{student.class_section_names?.[index] ?? `Class ${classId}`}</span>
                          <button className="btn-close btn-close-white" style={{ fontSize: 10 }} type="button" aria-label="Remove class" onClick={() => void removeAssignment(student.student_id, classId)} />
                        </span>
                      ))}
                    </div>
                  ) : (
                    <span className="text-muted">No class assigned</span>
                  )}
                </td>
                <td>{formatDate(student.registration_date)}</td>
                <td>{student.school_year ?? '—'}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminStudentProfilesPage() {
  const [schoolYear, setSchoolYear] = useState('')
  const [students, setStudents] = useState<StudentDirectoryRow[]>([])
  const [editing, setEditing] = useState<StudentDirectoryRow | null>(null)
  const [parentDetails, setParentDetails] = useState<Record<string, unknown> | null>(null)
  const [emergencyContacts, setEmergencyContacts] = useState<Array<Record<string, unknown>>>([])
  const [message, setMessage] = useState<string | null>(null)
  const [loading, setLoading] = useState(true)

  async function load(year = schoolYear) {
    setLoading(true)
    try {
      const data = await fetchStudentDirectory(year || undefined)
      setStudents(data.students ?? [])
      setSchoolYear(data.school_year ?? year ?? '')
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void load()
  }, [])

  async function openDetails(student: StudentDirectoryRow) {
    setEditing(student)
    const [parent, contacts] = await Promise.all([
      fetchStudentParent(student.id),
      fetchStudentEmergencyContacts(student.id),
    ])
    setParentDetails(parent.parent ?? null)
    setEmergencyContacts(contacts.rows ?? [])
  }

  async function saveStudent() {
    if (!editing) return
    const result = await updateStudentProfile(editing.id, {
      school_id: editing.school_id ?? '',
      firstname: editing.firstname ?? '',
      lastname: editing.lastname ?? '',
      dob: editing.dob ?? '',
      age: editing.age ?? null,
      gender: editing.gender ?? 'Male',
      registration_grade: editing.registration_grade ?? '',
      photo_consent: Boolean(editing.photo_consent),
      parent_id: editing.parent_id ?? 0,
      registration_date: editing.registration_date ?? null,
      tuition_paid: Boolean(editing.tuition_paid),
      year_of_registration: editing.year_of_registration ?? '',
      school_year: editing.school_year ?? '',
      semester: editing.semester ?? '',
      is_new: Boolean(editing.is_new),
      is_active: Boolean(editing.is_active),
      medical_conditions: editing.medical_conditions ?? '',
      allergies: editing.allergies ?? '',
    })
    setMessage(result.message ?? 'Student updated successfully.')
    setEditing(null)
    await load()
  }

  return (
    <AdminParityShell title="Student Profiles">
      {message ? <div className="alert alert-info">{message}</div> : null}
      <div className="d-flex gap-2 mb-3">
        <input className="form-control" style={{ maxWidth: 240 }} value={schoolYear} onChange={(e) => setSchoolYear(e.target.value)} placeholder="School year" />
        <button className="btn btn-outline-secondary" type="button" onClick={() => void load()}>Apply</button>
      </div>
      <div className="table-responsive">
        <table className="table table-striped table-hover align-middle">
          <thead className="table-dark">
            <tr><th>School ID</th><th>First Name</th><th>Last Name</th><th>DOB</th><th>Age</th><th>Gender</th><th>Assigned Grade</th><th>Active</th><th>Photo Consent</th><th>Registration Date</th><th>Action</th></tr>
          </thead>
          <tbody>
            {loading ? <tr><td colSpan={11} className="text-muted">Loading students…</td></tr> : students.length === 0 ? <tr><td colSpan={11} className="text-muted">No students found.</td></tr> : students.map((student) => (
              <tr key={student.id}>
                <td>{student.school_id ?? '—'}</td>
                <td>{student.firstname ?? '—'}</td>
                <td>{student.lastname ?? '—'}</td>
                <td>{formatDate(student.dob)}</td>
                <td>{student.age ?? '—'}</td>
                <td>{student.gender ?? '—'}</td>
                <td>{student.registration_grade ?? '—'}</td>
                <td>{Boolean(student.is_active) ? 'Yes' : 'No'}</td>
                <td>{Boolean(student.photo_consent) ? 'Yes' : 'No'}</td>
                <td>{formatDate(student.registration_date)}</td>
                <td><button className="btn btn-sm btn-primary" type="button" onClick={() => void openDetails(student)}>View / Edit</button></td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
      {editing ? (
        <div className="modal d-block position-static mt-4" role="dialog" aria-modal="true">
          <div className="modal-dialog modal-xl">
            <div className="modal-content">
              <div className="modal-header">
                <h5 className="modal-title">Edit Student - {`${editing.firstname ?? ''} ${editing.lastname ?? ''}`.trim()}</h5>
                <button className="btn-close" type="button" onClick={() => setEditing(null)} />
              </div>
              <div className="modal-body">
                <div className="row g-3">
                  <div className="col-md-4"><label className="form-label">School ID</label><input className="form-control" value={editing.school_id ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, school_id: e.target.value } : current)} /></div>
                  <div className="col-md-4"><label className="form-label">First Name</label><input className="form-control" value={editing.firstname ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, firstname: e.target.value } : current)} /></div>
                  <div className="col-md-4"><label className="form-label">Last Name</label><input className="form-control" value={editing.lastname ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, lastname: e.target.value } : current)} /></div>
                  <div className="col-md-3"><label className="form-label">DOB</label><input type="date" className="form-control" value={formatDateInput(editing.dob)} onChange={(e) => setEditing((current) => current ? { ...current, dob: e.target.value } : current)} /></div>
                  <div className="col-md-2"><label className="form-label">Age</label><input type="number" className="form-control" value={editing.age ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, age: Number(e.target.value) || null } : current)} /></div>
                  <div className="col-md-3"><label className="form-label">Gender</label><select className="form-select" value={editing.gender ?? 'Male'} onChange={(e) => setEditing((current) => current ? { ...current, gender: e.target.value } : current)}><option value="Male">Male</option><option value="Female">Female</option><option value="Other">Other</option></select></div>
                  <div className="col-md-4"><label className="form-label">Registration Grade</label><input className="form-control" value={editing.registration_grade ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, registration_grade: e.target.value } : current)} /></div>
                  <div className="col-md-6"><label className="form-label">Medical Conditions</label><input className="form-control" value={editing.medical_conditions ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, medical_conditions: e.target.value } : current)} /></div>
                  <div className="col-md-6"><label className="form-label">Allergies</label><input className="form-control" value={editing.allergies ?? ''} onChange={(e) => setEditing((current) => current ? { ...current, allergies: e.target.value } : current)} /></div>
                </div>
                <hr />
                <div className="row g-4">
                  <div className="col-md-6">
                    <h6>Parent Information</h6>
                    {parentDetails ? (
                      <div className="small">
                        <div>{`${String(parentDetails.firstname ?? '')} ${String(parentDetails.lastname ?? '')}`.trim()}</div>
                        <div>{String(parentDetails.email ?? '—')}</div>
                        <div>{String(parentDetails.cellphone ?? '—')}</div>
                      </div>
                    ) : <p className="text-muted small mb-0">No parent record found.</p>}
                  </div>
                  <div className="col-md-6">
                    <h6>Emergency Contacts</h6>
                    {emergencyContacts.length === 0 ? <p className="text-muted small mb-0">No emergency contacts found.</p> : (
                      <ul className="small mb-0">
                        {emergencyContacts.map((contact, index) => <li key={index}>{String(contact.emergency_contact_name ?? contact.name ?? 'Contact')} - {String(contact.cellphone ?? '—')}</li>)}
                      </ul>
                    )}
                  </div>
                </div>
              </div>
              <div className="modal-footer">
                <button className="btn btn-secondary" type="button" onClick={() => setEditing(null)}>Close</button>
                <button className="btn btn-primary" type="button" onClick={() => void saveStudent()}>Save</button>
              </div>
            </div>
          </div>
        </div>
      ) : null}
    </AdminParityShell>
  )
}

export function AdminSubjectCurriculumPage() {
  const [classes, setClasses] = useState<Array<{ id: number; class_name: string }>>([])
  const [entries, setEntries] = useState<SubjectCurriculumEntryRow[]>([])
  const [subjects, setSubjects] = useState<Record<string, string>>({})
  const [form, setForm] = useState({ class_id: '', subject: 'islamic', unit_number: '', unit_title: '', chapter_name: '' })
  const [editingId, setEditingId] = useState<number | null>(null)
  const [message, setMessage] = useState<string | null>(null)

  async function load() {
    const data = await fetchSubjectCurriculum()
    setClasses(data.classes ?? [])
    setEntries(data.entries ?? [])
    setSubjects(data.subject_labels ?? {})
  }

  useEffect(() => {
    void load()
  }, [])

  async function submitForm(e: FormEvent) {
    e.preventDefault()
    const payload = {
      class_id: Number(form.class_id),
      subject: form.subject,
      unit_number: form.unit_number ? Number(form.unit_number) : null,
      unit_title: form.unit_title || null,
      chapter_name: form.chapter_name,
    }
    if (editingId) {
      await updateSubjectCurriculum(editingId, payload)
      setMessage('Curriculum entry updated.')
    } else {
      await createSubjectCurriculum(payload)
      setMessage('Curriculum entry created.')
    }
    setEditingId(null)
    setForm({ class_id: '', subject: 'islamic', unit_number: '', unit_title: '', chapter_name: '' })
    await load()
  }

  return (
    <AdminParityShell title="Subject Curriculum">
      {message ? <div className="alert alert-info">{message}</div> : null}
      <div className="row g-4">
        <div className="col-lg-5">
          <div className="card shadow-sm">
            <div className="card-header">{editingId ? 'Edit curriculum entry' : 'Add new curriculum entry'}</div>
            <div className="card-body">
              <form onSubmit={(e) => void submitForm(e)}>
                <div className="mb-3">
                  <label className="form-label">Class</label>
                  <select className="form-select" value={form.class_id} onChange={(e) => setForm((current) => ({ ...current, class_id: e.target.value }))} required>
                    <option value="">Select a class</option>
                    {classes.map((classRow) => <option key={classRow.id} value={classRow.id}>{classRow.class_name}</option>)}
                  </select>
                </div>
                <div className="mb-3">
                  <label className="form-label">Subject</label>
                  <select className="form-select" value={form.subject} onChange={(e) => setForm((current) => ({ ...current, subject: e.target.value }))} required>
                    {Object.entries(subjects).map(([key, label]) => <option key={key} value={key}>{label}</option>)}
                  </select>
                </div>
                <div className="mb-3"><label className="form-label">Unit / Term number</label><input type="number" className="form-control" value={form.unit_number} onChange={(e) => setForm((current) => ({ ...current, unit_number: e.target.value }))} /></div>
                <div className="mb-3"><label className="form-label">Unit title</label><input className="form-control" value={form.unit_title} onChange={(e) => setForm((current) => ({ ...current, unit_title: e.target.value }))} /></div>
                <div className="mb-3"><label className="form-label">Chapter / Surah</label><input className="form-control" value={form.chapter_name} onChange={(e) => setForm((current) => ({ ...current, chapter_name: e.target.value }))} required /></div>
                <div className="d-flex gap-2">
                  <button className="btn btn-primary flex-grow-1" type="submit">{editingId ? 'Apply changes' : 'Save curriculum entry'}</button>
                  {editingId ? <button className="btn btn-outline-secondary" type="button" onClick={() => { setEditingId(null); setForm({ class_id: '', subject: 'islamic', unit_number: '', unit_title: '', chapter_name: '' }) }}>Cancel</button> : null}
                </div>
              </form>
            </div>
          </div>
        </div>
        <div className="col-lg-7">
          <div className="card shadow-sm">
            <div className="card-header">Current curriculum entries</div>
            <div className="table-responsive">
              <table className="table table-bordered table-hover align-middle mb-0">
                <thead className="table-light"><tr><th>Class</th><th>Subject</th><th>Unit</th><th>Unit title</th><th>Chapter / Surah</th><th>Actions</th></tr></thead>
                <tbody>
                  {entries.length === 0 ? <tr><td colSpan={6} className="text-muted">No curriculum records yet.</td></tr> : entries.map((entry) => (
                    <tr key={entry.id}>
                      <td>{entry.class_name ?? '—'}</td>
                      <td>{subjects[entry.subject] ?? entry.subject}</td>
                      <td>{entry.unit_number ?? '—'}</td>
                      <td>{entry.unit_title ?? '—'}</td>
                      <td>{entry.chapter_name}</td>
                      <td className="d-flex gap-2">
                        <button className="btn btn-sm btn-outline-primary" type="button" onClick={() => { setEditingId(entry.id); setForm({ class_id: String(entry.class_id), subject: entry.subject, unit_number: entry.unit_number ? String(entry.unit_number) : '', unit_title: entry.unit_title ?? '', chapter_name: entry.chapter_name }) }}>Edit</button>
                        <button className="btn btn-sm btn-outline-danger" type="button" onClick={() => void deleteSubjectCurriculum(entry.id).then(load)}>Delete</button>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

export function AdminTeacherClassAssignmentPage() {
  const [schoolYear, setSchoolYear] = useState('')
  const [teachers, setTeachers] = useState<TeacherClassAssignmentRow[]>([])
  const [classes, setClasses] = useState<TeacherClassOption[]>([])
  const [selectedTeacherId, setSelectedTeacherId] = useState<number | null>(null)
  const [selectedClassId, setSelectedClassId] = useState<number | null>(null)
  const [selectedRole, setSelectedRole] = useState('')
  const [message, setMessage] = useState<string | null>(null)

  async function load(year = schoolYear) {
    const data = await fetchTeacherClassAssignments(year || undefined)
    setTeachers(data.teachers ?? [])
    setClasses(data.classes ?? [])
    setSchoolYear(data.school_year ?? year ?? '')
  }

  useEffect(() => {
    void load()
  }, [])

  async function submitAssignment() {
    if (!selectedTeacherId || !selectedClassId) return
    const teacher = teachers.find((row) => row.teacher_id === selectedTeacherId)
      const result = await assignTeacherClass({
      teacher_id: selectedTeacherId,
      class_section_id: selectedClassId,
      teacher_role: selectedRole || (teacher?.role ?? undefined),
      school_year: schoolYear || undefined,
    })
    setMessage(result.message ?? 'Class assigned successfully.')
    setSelectedTeacherId(null)
    setSelectedClassId(null)
    setSelectedRole('')
    await load()
  }

  async function removeAssignment(teacherId: number, classSectionId: number, position: 'main' | 'ta') {
    const result = await deleteTeacherClassAssignment({
      teacher_id: teacherId,
      class_section_id: classSectionId,
      position,
      school_year: schoolYear || undefined,
    })
    setMessage(result.message ?? 'Assignment removed.')
    await load()
  }

  return (
    <AdminParityShell title="Teacher Class Assignments">
      {message ? <div className="alert alert-info">{message}</div> : null}
      <div className="row g-3 mb-4">
        <div className="col-lg-3"><label className="form-label">School Year</label><div className="d-flex gap-2"><input className="form-control" value={schoolYear} onChange={(e) => setSchoolYear(e.target.value)} /><button className="btn btn-outline-secondary" type="button" onClick={() => void load()}>Apply</button></div></div>
        <div className="col-lg-3"><label className="form-label">Teacher</label><select className="form-select" value={selectedTeacherId ?? ''} onChange={(e) => { const id = e.target.value ? Number(e.target.value) : null; setSelectedTeacherId(id); const teacher = teachers.find((row) => row.teacher_id === id); setSelectedRole(String(teacher?.role ?? '')) }}><option value="">Select teacher…</option>{teachers.map((teacher) => <option key={teacher.teacher_id} value={teacher.teacher_id}>{teacher.name ?? `${teacher.firstname ?? ''} ${teacher.lastname ?? ''}`.trim()}</option>)}</select></div>
        <div className="col-lg-4"><label className="form-label">Class</label><select className="form-select" value={selectedClassId ?? ''} onChange={(e) => setSelectedClassId(e.target.value ? Number(e.target.value) : null)}><option value="">Select class…</option>{classes.map((classRow) => <option key={classRow.class_section_id} value={classRow.class_section_id}>{classRow.class_section_name}</option>)}</select></div>
        <div className="col-lg-2 d-grid"><button className="btn btn-primary align-self-end" type="button" onClick={() => void submitAssignment()} disabled={!selectedTeacherId || !selectedClassId}>Assign Class</button></div>
      </div>
      <div className="table-responsive">
        <table className="table table-striped table-hover align-middle">
          <thead className="table-dark"><tr><th>#</th><th>First Name</th><th>Last Name</th><th>Email</th><th>Phone</th><th>Role</th><th>Assigned Classes</th><th>School Year</th></tr></thead>
          <tbody>
            {teachers.length === 0 ? <tr><td colSpan={8} className="text-muted">No teachers found.</td></tr> : teachers.map((teacher, index) => (
              <tr key={teacher.teacher_id}>
                <td>{index + 1}</td>
                <td>{teacher.firstname ?? '—'}</td>
                <td>{teacher.lastname ?? '—'}</td>
                <td>{teacher.email ?? '—'}</td>
                <td>{teacher.cellphone ?? '—'}</td>
                <td>{teacher.role ? teacher.role.replace(/_/g, ' ') : '—'}</td>
                <td>
                  {[...(teacher.main_assignments ?? []), ...(teacher.ta_assignments ?? [])].length === 0 ? <span className="text-muted">No classes assigned</span> : (
                    <ul className="list-unstyled mb-0">
                      {(teacher.main_assignments ?? []).map((assignment) => (
                        <li key={`main-${teacher.teacher_id}-${assignment.section_id}`} className="mb-1 d-flex align-items-center justify-content-between gap-2">
                          <span><strong>{assignment.class_section_name ?? 'Class'}</strong> (Main)</span>
                          <button className="btn btn-outline-danger btn-sm" type="button" onClick={() => void removeAssignment(teacher.teacher_id, Number(assignment.section_id), 'main')}>Remove</button>
                        </li>
                      ))}
                      {(teacher.ta_assignments ?? []).map((assignment) => (
                        <li key={`ta-${teacher.teacher_id}-${assignment.section_id}`} className="mb-1 d-flex align-items-center justify-content-between gap-2">
                          <span><strong>{assignment.class_section_name ?? 'Class'}</strong> (TA)</span>
                          <button className="btn btn-outline-danger btn-sm" type="button" onClick={() => void removeAssignment(teacher.teacher_id, Number(assignment.section_id), 'ta')}>Remove</button>
                        </li>
                      ))}
                    </ul>
                  )}
                </td>
                <td>{teacher.school_year ?? schoolYear ?? '—'}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminTeacherSubmissionsPage() {
  const [rows, setRows] = useState<TeacherSubmissionReportRow[]>([])
  const [summary, setSummary] = useState<{ total_items?: number; missing_items?: number; submitted_items?: number; submission_percentage?: number }>({})
  const [selected, setSelected] = useState<Record<string, boolean>>({})
  const [message, setMessage] = useState<string | null>(null)
  const [semester, setSemester] = useState<string | null>(null)
  const [schoolYear, setSchoolYear] = useState<string | null>(null)

  async function load() {
    const data = await fetchTeacherSubmissions()
    setRows(data.rows ?? [])
    setSummary(data.summary ?? {})
    setSemester(data.semester ?? null)
    setSchoolYear(data.schoolYear ?? null)
  }

  useEffect(() => {
    void load()
  }, [])

  async function sendNotifications() {
    const notify = Object.entries(selected).filter(([, checked]) => checked).map(([id]) => Number(id))
    if (notify.length === 0) return
    const missingItems = Object.fromEntries(
      rows.flatMap((row) =>
        (row.teachers ?? []).map((teacher) => [String(teacher.id), row.missing_items ?? []]),
      ),
    )
    const result = await notifyTeacherSubmissions({ notify, missing_items: missingItems })
    setMessage(result.message ?? 'Notifications sent.')
  }

  return (
    <AdminParityShell title="Teacher Submission Dashboard">
      {message ? <div className="alert alert-info">{message}</div> : null}
      <div className="row g-3 mb-4">
        <div className="col-sm-6 col-xl-3"><div className="card shadow-sm"><div className="card-body"><div className="text-uppercase small text-muted">Completion</div><div className="fs-3 fw-semibold">{summary.submission_percentage ?? 0}%</div></div></div></div>
        <div className="col-sm-6 col-xl-3"><div className="card shadow-sm"><div className="card-body"><div className="text-uppercase small text-muted">Missing Items</div><div className="fs-3 fw-semibold">{summary.missing_items ?? 0}</div></div></div></div>
        <div className="col-sm-6 col-xl-3"><div className="card shadow-sm"><div className="card-body"><div className="text-uppercase small text-muted">Submitted</div><div className="fs-3 fw-semibold">{summary.submitted_items ?? 0}</div></div></div></div>
        <div className="col-sm-6 col-xl-3"><div className="card shadow-sm"><div className="card-body"><div className="text-uppercase small text-muted">Term</div><div className="fs-6 fw-semibold">{`${semester ?? '—'} ${schoolYear ?? ''}`.trim()}</div></div></div></div>
      </div>
      <div className="d-flex justify-content-end mb-3">
        <button className="btn btn-primary" type="button" onClick={() => void sendNotifications()}>Notify Selected Teachers</button>
      </div>
      <div className="table-responsive">
        <table className="table table-striped table-bordered align-middle">
          <thead className="table-light">
            <tr><th>Notify</th><th>Class-Section</th><th>Teachers</th><th>Midterm Score</th><th>Midterm Comment</th><th>Participation</th><th>PTAP Comment</th><th>Attendance</th><th>Missing Items</th><th>Student Count</th></tr>
          </thead>
          <tbody>
            {rows.length === 0 ? <tr><td colSpan={10} className="text-muted">No teacher-class assignments found for this term.</td></tr> : rows.map((row) => (
              <tr key={String(row.class_section_id ?? row.class_section ?? '')}>
                <td>
                  <div className="d-flex flex-column gap-1">
                    {(row.teachers ?? []).map((teacher) => (
                      <label key={teacher.id} className="form-check mb-0">
                        <input className="form-check-input" type="checkbox" checked={Boolean(selected[String(teacher.id)])} onChange={(e) => setSelected((current) => ({ ...current, [String(teacher.id)]: e.target.checked }))} />
                        <span className="form-check-label ms-2">{teacher.label}</span>
                      </label>
                    ))}
                  </div>
                </td>
                <td>{row.class_section ?? '—'}</td>
                <td>{(row.teachers ?? []).map((teacher) => teacher.label).join(', ') || '—'}</td>
                <td><span className={`badge ${submissionBadgeClass(row.midterm_score_status)}`}>{row.midterm_score_status ?? 'missing'}</span></td>
                <td><span className={`badge ${submissionBadgeClass(row.midterm_comment_status)}`}>{row.midterm_comment_status ?? 'missing'}</span></td>
                <td><span className={`badge ${submissionBadgeClass(row.participation_status)}`}>{row.participation_status ?? 'missing'}</span></td>
                <td><span className={`badge ${submissionBadgeClass(row.ptap_comment_status)}`}>{row.ptap_comment_status ?? 'missing'}</span></td>
                <td><span className={`badge ${submissionBadgeClass(row.attendance_status)}`}>{row.attendance_status ?? 'missing'}</span></td>
                <td>{(row.missing_items ?? []).join(', ') || '—'}</td>
                <td>{row.student_count ?? 0}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </AdminParityShell>
  )
}

export function AdminClassWarningModalPage() {
  const [searchParams] = useSearchParams()
  const warningMessage = searchParams.get('message') ?? 'An unexpected class assignment issue occurred.'

  return (
    <AdminParityShell title="Warning">
      <div className="modal d-block position-static" role="alertdialog" aria-modal="true">
        <div className="modal-dialog modal-dialog-centered">
          <div className="modal-content border-warning">
            <div className="modal-header bg-warning text-dark">
              <h5 className="modal-title">
                <i className="bi bi-exclamation-triangle-fill me-2" aria-hidden />Warning
              </h5>
            </div>
            <div className="modal-body text-dark fs-6">{warningMessage}</div>
            <div className="modal-footer justify-content-between">
              <Link to="/app/administrator/class_assignment" className="btn btn-secondary">
                Back to Class Assignment
              </Link>
            </div>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}

export function AdminCourseMaterialsPage() {
  return (
    <AdminParityShell title="Course Materials">
      <div className="alert alert-secondary">
        The legacy `course_materials.php` view only contained hardcoded sample rows, and there is no
        matching course-materials API in the current backend.
      </div>
      <div className="card">
        <div className="card-body">
          <p className="mb-3">
            I converted this page into an explicit admin placeholder instead of wiring a fake upload
            form with no backend. The current API-backed alternatives in this app are class progress,
            assignments, and class sections.
          </p>
          <div className="d-flex gap-2 flex-wrap">
            <Link className="btn btn-outline-primary" to="/app/administrator/class_assignment">
              Class Assignment
            </Link>
            <Link className="btn btn-outline-primary" to="/app/administrator/class_section">
              Class Sections
            </Link>
            <Link className="btn btn-outline-primary" to="/app/administrator/calendar_view">
              Calendar Events
            </Link>
          </div>
        </div>
      </div>
    </AdminParityShell>
  )
}