<?php

namespace App\Controllers\View;

use App\Models\CalendarModel;
use App\Models\AttendanceDataModel;
use App\Models\ReportCardAcknowledgementModel;
use App\Services\SemesterRangeService;

class ReportCardsController extends PrintablesBaseController
{
    protected $calendarModel;
    protected $semesterRangeService;
    protected $ackModel;

    public function __construct()
    {
        parent::__construct();
        $this->calendarModel = new CalendarModel();
        $this->semesterRangeService = new SemesterRangeService($this->configModel);
        $this->ackModel = new ReportCardAcknowledgementModel();
    }

    public function report_card()
    {
        return view('printables_reports/report_card', [
            'schoolYear' => (string)($this->schoolYear ?? ''),
            'semester'   => (string)($this->semester   ?? ''),
        ]);
    }

    /**
     * API: report card meta for UI hydration
     * GET params: school_year
     * Returns: { ok, schoolYears, selectedYear, students:[{id,firstname,lastname}], classSections:[{id,name}] }
     */
    public function reportCardMeta()
    {
        $year = trim((string)($this->request->getGet('school_year') ?? $this->schoolYear ?? ''));
        $sem  = trim((string)($this->request->getGet('semester')     ?? $this->semester   ?? ''));
        if ($year === '') {
            // fallback to latest present in classSection or semester_score
            $yr = $this->db->table('classSection')->select('school_year')->orderBy('school_year', 'DESC')->get(1)->getRowArray();
            $year = (string)($yr['school_year'] ?? '');
        }

        // Build schoolYears from classSection and semester_scores
        $schoolYears = [];
        try {
            $q1 = $this->db->table('classSection')->select('DISTINCT school_year', false)->where('school_year IS NOT NULL', null, false)->orderBy('school_year', 'DESC')->get()->getResultArray();
            $schoolYears = array_values(array_filter(array_map(static fn($r) => (string)($r['school_year'] ?? ''), $q1)));
        } catch (\Throwable $e) {
        }
        try {
            $q2 = $this->db->table('semester_scores')->select('DISTINCT school_year', false)->where('school_year IS NOT NULL', null, false)->orderBy('school_year', 'DESC')->get()->getResultArray();
            foreach ($q2 as $r) {
                $val = (string)($r['school_year'] ?? '');
                if ($val !== '' && !in_array($val, $schoolYears, true)) $schoolYears[] = $val;
            }
        } catch (\Throwable $e) {
        }
        rsort($schoolYears);

        // Semesters available for the selected year (from scores + rosters), with defaults
        $semesters = [];
        try {
            $rs = $this->db->table('semester_scores')
                ->select('DISTINCT semester', false)
                ->where('school_year', $year)
                ->where('semester IS NOT NULL', null, false)
                ->orderBy('semester', 'ASC')
                ->get()->getResultArray();
            $semesters = array_values(array_filter(array_map(static fn($r) => (string)($r['semester'] ?? ''), $rs)));
        } catch (\Throwable $e) {
        }
        // Ensure standard options are present even if data is missing (so Spring can be selected)
        $defaults = array_values(array_filter([(string)($this->semester ?? ''), 'Fall', 'Spring'], static fn($v) => $v !== ''));
        foreach ($defaults as $d) {
            if (!in_array($d, $semesters, true)) $semesters[] = $d;
        }
        $semesters = array_values(array_unique($semesters));
        // Preserve existing selected semester if provided, otherwise pick the first
        if ($sem === '' && !empty($semesters)) {
            $sem = $semesters[0];
        } elseif ($sem !== '' && !in_array($sem, $semesters, true)) {
            array_unshift($semesters, $sem);
            $semesters = array_values(array_unique($semesters));
        }

        // Students: prefer those with scores in selected year (+semester if provided); fallback to all
        $students = [];
        try {
            $builder = $this->db->table('semester_scores ss')
                ->select('s.id, s.firstname, s.lastname, GROUP_CONCAT(DISTINCT cs.class_section_name ORDER BY cs.class_section_name SEPARATOR ", ") AS class_section_name', false)
                ->join('students s', 's.id = ss.student_id', 'inner')
                ->join('student_class sc', 'sc.student_id = s.id AND sc.school_year = ss.school_year', 'left')
                ->join('classSection cs', 'cs.class_section_id = sc.class_section_id', 'left')
                ->where('s.is_active', 1)
                ->where('ss.school_year', $year);
            if ($sem !== '') {
                $this->applySemesterFilter($builder, $sem, 'ss.semester');
            }
            $stuRows = $builder
                ->groupBy('s.id, s.firstname, s.lastname')
                ->orderBy('class_section_name', 'ASC')
                ->orderBy('s.firstname', 'ASC')
                ->orderBy('s.lastname', 'ASC')
                ->get()
                ->getResultArray();
            if (!empty($stuRows)) $students = $stuRows;
        } catch (\Throwable $e) {
        }
        if (empty($students)) {
            $fallback = $this->studentModel
                ->select('students.id, students.firstname, students.lastname, GROUP_CONCAT(DISTINCT cs.class_section_name ORDER BY cs.class_section_name SEPARATOR ", ") AS class_section_name', false)
                ->join('student_class sc', 'sc.student_id = students.id', 'left')
                ->join('classSection cs', 'cs.class_section_id = sc.class_section_id', 'left');
            if ($year !== '') {
                $fallback->where('sc.school_year', $year);
            }
            $students = $fallback
                ->where('students.is_active', 1)
                ->groupBy('students.id, students.firstname, students.lastname')
                ->orderBy('class_section_name', 'ASC')
                ->orderBy('students.firstname', 'ASC')
                ->orderBy('students.lastname', 'ASC')
                ->findAll();
        }

        // Class sections with at least one student for the selected year/semester
        $classSections = [];
        try {
            $builder = $this->db->table('classSection cs')
                ->select('cs.id, cs.class_section_id, cs.class_section_name, cs.school_year')
                ->join('student_class sc', 'sc.class_section_id = cs.class_section_id', 'inner')
                ->join('students s', 's.id = sc.student_id', 'inner')
                ->where('s.is_active', 1)
                ->where('sc.school_year', $year);
            $classSections = $builder
                ->groupBy('cs.id, cs.class_section_id, cs.class_section_name, cs.school_year')
                ->orderBy('cs.class_section_name', 'ASC')
                ->get()
                ->getResultArray();

            // If no matches for the semester filter, retry for the year only
            if (empty($classSections) && $sem !== '') {
                $classSections = $this->db->table('classSection cs')
                    ->select('cs.id, cs.class_section_id, cs.class_section_name, cs.school_year')
                    ->join('student_class sc', 'sc.class_section_id = cs.class_section_id', 'inner')
                    ->join('students s', 's.id = sc.student_id', 'inner')
                    ->where('s.is_active', 1)
                    ->where('sc.school_year', $year)
                    ->groupBy('cs.id, cs.class_section_id, cs.class_section_name, cs.school_year')
                    ->orderBy('cs.class_section_name', 'ASC')
                    ->get()
                    ->getResultArray();
            }
        } catch (\Throwable $e) {
        }

        return $this->response->setJSON([
            'ok'            => true,
            'schoolYears'   => $schoolYears,
            'selectedYear'  => $year,
            'semesters'     => $semesters,
            'selectedSemester' => $sem,
            'students'      => $students,
            'classSections' => array_map(static fn($r) => [
                'id' => (int)($r['id'] ?? 0),
                'class_section_id' => (int)($r['class_section_id'] ?? ($r['id'] ?? 0)),
                'class_section_name' => (string)($r['class_section_name'] ?? 'Section'),
                'school_year' => (string)($r['school_year'] ?? ''),
            ], $classSections),
            'csrf_token'    => csrf_token(),
            'csrf_hash'     => csrf_hash(),
        ]);
    }

    /**
     * API: report card completeness check for a class section.
     * GET params: class_section_id, school_year, semester
     * Returns: { ok, summary, students:[{id,name,missing[],warnings[],complete}] }
     */
    public function reportCardCompleteness()
    {
        $year = trim((string)($this->request->getGet('school_year') ?? $this->schoolYear ?? ''));
        $sem  = trim((string)($this->request->getGet('semester') ?? $this->semester ?? ''));
        $sectionInput = (int)($this->request->getGet('class_section_id') ?? 0);

        if ($year === '' || $sectionInput <= 0) {
            return $this->response->setJSON([
                'ok' => false,
                'message' => 'Missing school year or class section.',
            ]);
        }

        $sectionCode = $sectionInput;
        $sectionId = null;
        $sectionName = '';
        try {
            $row = $this->db->table('classSection')
                ->select('id, class_section_id, class_section_name')
                ->where('class_section_id', $sectionInput)
                ->limit(1)
                ->get()
                ->getRowArray();
            if ($row) {
                $sectionId = (int)$row['id'];
                $sectionCode = (int)$row['class_section_id'];
                $sectionName = (string)($row['class_section_name'] ?? '');
            } else {
                $row = $this->db->table('classSection')
                    ->select('id, class_section_id, class_section_name')
                    ->where('id', $sectionInput)
                    ->limit(1)
                    ->get()
                    ->getRowArray();
                if ($row) {
                    $sectionId = (int)$row['id'];
                    $sectionCode = (int)$row['class_section_id'];
                    $sectionName = (string)($row['class_section_name'] ?? '');
                }
            }
        } catch (\Throwable $e) {
        }

        if ($sectionName === '') {
            $sectionName = (string)($this->resolveClassName($this->db, $sectionCode) ?? '');
        }

        $students = $this->fetchStudentsByClass($sectionCode, $year);
        if (empty($students) && $sectionId && $sectionId !== $sectionCode) {
            $students = $this->fetchStudentsByClass($sectionId, $year);
        }
        $rosterSemester = $sem;
        $usedFallback = false;
        if (empty($students) && $sem !== '') {
            $students = $this->fetchStudentsByClass($sectionCode, $year);
            if (empty($students) && $sectionId && $sectionId !== $sectionCode) {
                $students = $this->fetchStudentsByClass($sectionId, $year);
            }
            $rosterSemester = '';
            $usedFallback = !empty($students);
        }

        if (empty($students)) {
            return $this->response->setJSON([
                'ok' => true,
                'message' => 'No students found for the selected class and year.',
                'summary' => [
                    'total' => 0,
                    'complete' => 0,
                    'incomplete' => 0,
                    'warnings' => 0,
                ],
                'students' => [],
                'roster_semester' => $rosterSemester,
                'used_fallback' => $usedFallback,
            ]);
        }

        $studentIds = array_values(array_filter(array_map(
            static fn($s) => (int)($s['id'] ?? 0),
            $students
        ), static fn($v) => $v > 0));

        if (empty($studentIds)) {
            return $this->response->setJSON([
                'ok' => false,
                'message' => 'No valid students found.',
            ]);
        }

        $scoreRows = $this->semesterScoreModel
            ->whereIn('student_id', $studentIds)
            ->where('school_year', $year);
        if ($sem !== '') {
            $this->applySemesterFilter($scoreRows, $sem, 'semester');
        }
        $scoreRows = $scoreRows
            ->orderBy('updated_at', 'DESC')
            ->orderBy('id', 'DESC')
            ->findAll();

        $scoreByStudent = [];
        foreach ($scoreRows as $row) {
            $sid = (int)($row['student_id'] ?? 0);
            if ($sid > 0 && !isset($scoreByStudent[$sid])) {
                $scoreByStudent[$sid] = $row;
            }
        }

        $semLower = strtolower(trim($sem));
        $isFirst = in_array($semLower, ['fall', 'first', 'semester 1', '1'], true);
        $isSecond = in_array($semLower, ['spring', 'second', 'semester 2', '2'], true);

        $firstScoreByStudent = [];
        if ($isSecond) {
            $otherRows = $this->semesterScoreModel
                ->whereIn('student_id', $studentIds)
                ->where('school_year', $year);
            if ($sem !== '') {
                $this->applySemesterExclusion($otherRows, $sem, 'semester');
            }
            $otherRows = $otherRows
                ->orderBy('updated_at', 'DESC')
                ->orderBy('id', 'DESC')
                ->findAll();
            foreach ($otherRows as $row) {
                $sid = (int)($row['student_id'] ?? 0);
                if ($sid > 0 && !isset($firstScoreByStudent[$sid])) {
                    $firstScoreByStudent[$sid] = $row;
                }
            }
        }

        $examCommentTypes = $isSecond
            ? ['final']
            : ($isFirst ? ['midterm'] : ['midterm', 'final']);
        $commentTypes = array_merge($examCommentTypes, ['ptap', 'attendance', 'attendance_comment']);
        $hasCommentReview = $this->db->fieldExists('comment_review', 'score_comments');
        $commentSelect = $hasCommentReview
            ? 'student_id, score_type, comment, comment_review'
            : 'student_id, score_type, comment';
        $commentBuilder = $this->scoreCommentModel
            ->select($commentSelect)
            ->whereIn('student_id', $studentIds)
            ->where('school_year', $year)
            ->whereIn('score_type', $commentTypes);
        if ($sem !== '') {
            $this->applySemesterFilter($commentBuilder, $sem, 'semester');
        }
        $commentRows = [];
        try {
            $commentRows = $commentBuilder->findAll();
        } catch (\Throwable $e) {
        }

        $commentsByStudent = [];
        foreach ($commentRows as $row) {
            $sid = (int)($row['student_id'] ?? 0);
            if ($sid <= 0) {
                continue;
            }
            $typeRaw = strtolower(trim((string)($row['score_type'] ?? '')));
            if ($typeRaw === '') {
                continue;
            }
            if ($typeRaw === 'attendance_comment') {
                $typeRaw = 'attendance';
            }
            $reviewVal = $hasCommentReview ? trim((string)($row['comment_review'] ?? '')) : '';
            $commentVal = $hasCommentReview ? $reviewVal : trim((string)($row['comment'] ?? ''));
            if ($commentVal === '') {
                continue;
            }
            $commentsByStudent[$sid][$typeRaw] = $commentVal;
        }

        $isNumeric = static fn($v) => $v !== null && $v !== '' && is_numeric($v);

        $ackMap = [];
        try {
            $ackRows = $this->ackModel
                ->whereIn('student_id', $studentIds)
                ->where('school_year', $year)
                ->where('semester', $sem)
                ->orderBy('updated_at', 'DESC')
                ->findAll();
            foreach ($ackRows as $row) {
                $sid = (int) ($row['student_id'] ?? 0);
                if ($sid > 0 && ! isset($ackMap[$sid])) {
                    $ackMap[$sid] = $row;
                }
            }
        } catch (\Throwable $e) {
            $ackMap = [];
        }

        $results = [];
        $completeCount = 0;
        $warningCount = 0;
        foreach ($students as $student) {
            $sid = (int)($student['id'] ?? 0);
            $name = trim(((string)($student['firstname'] ?? '')) . ' ' . ((string)($student['lastname'] ?? '')));
            $missing = [];
            $warnings = [];

            if ($sectionName === '') {
                $missing[] = 'Grade/Section';
            }

            $score = $sid > 0 ? ($scoreByStudent[$sid] ?? null) : null;
            $examScore = null;
            $attendanceScore = null;
            $ptapScore = null;
            $semesterScore = null;
            $hasAllComponents = false;

            if (!$score) {
                $missing[] = 'Score record';
            } else {
                $attendanceScore = $score['attendance_score'] ?? null;
                $ptapScore = $score['ptap_score'] ?? null;
                $semesterScore = $score['semester_score'] ?? null;

                $components = [
                    $score['homework_avg'] ?? null,
                    $score['quiz_avg'] ?? null,
                    $score['project_avg'] ?? null,
                    $score['test_avg'] ?? null,
                ];
                $hasAllComponents = !in_array(false, array_map($isNumeric, $components), true);

                if ($isSecond) {
                    $examScore = $score['final_exam_score'] ?? null;
                    if (!$isNumeric($examScore) && $isNumeric($score['midterm_exam_score'] ?? null)) {
                        $examScore = $score['midterm_exam_score'];
                        $warnings[] = 'Final exam stored as midterm';
                    }
                } elseif ($isFirst) {
                    $examScore = $score['midterm_exam_score'] ?? null;
                } else {
                    $examScore = $score['final_exam_score'] ?? ($score['midterm_exam_score'] ?? null);
                }

                if (!$isNumeric($examScore)) {
                    $missing[] = $isSecond ? 'Final exam score' : ($isFirst ? 'Midterm exam score' : 'Exam score');
                }
                if (!$isNumeric($attendanceScore)) {
                    $missing[] = 'Attendance score';
                }
                if (!$isNumeric($ptapScore)) {
                    if ($hasAllComponents) {
                        $warnings[] = 'PTAP computed from components';
                    } else {
                        $missing[] = 'PTAP score';
                    }
                }

                $canComputeSemester = $isNumeric($examScore) && $isNumeric($attendanceScore) && ($isNumeric($ptapScore) || $hasAllComponents);
                if (!$isNumeric($semesterScore)) {
                    if ($canComputeSemester) {
                        $warnings[] = 'Semester score computed';
                    } else {
                        $missing[] = 'Semester score';
                    }
                }

                if ($isSecond) {
                    $firstScore = $firstScoreByStudent[$sid]['semester_score'] ?? null;
                    if (!$isNumeric($firstScore)) {
                        $missing[] = 'First semester score';
                    }
                }
            }

            $commentKey = $isSecond ? 'final' : ($isFirst ? 'midterm' : '');
            $commentLabel = $isSecond ? 'Final' : ($isFirst ? 'Midterm' : 'Exam');
            $commentSet = $commentsByStudent[$sid] ?? [];
            $examComment = $commentKey !== ''
                ? ($commentSet[$commentKey] ?? '')
                : ($commentSet['final'] ?? ($commentSet['midterm'] ?? ''));
            if (trim((string)$examComment) === '') {
                $missing[] = $commentLabel . ' comment';
            }
            if (trim((string)($commentSet['ptap'] ?? '')) === '') {
                $missing[] = 'PTAP comment';
            }
            if (trim((string)($commentSet['attendance'] ?? '')) === '') {
                $missing[] = 'Attendance comment';
            }

            $isComplete = empty($missing);
            if ($isComplete) {
                $completeCount++;
            }
            if (!empty($warnings)) {
                $warningCount++;
            }

            $ack = $sid > 0 ? ($ackMap[$sid] ?? null) : null;
            $results[] = [
                'id' => $sid,
                'name' => $name !== '' ? $name : 'N/A',
                'missing' => $missing,
                'warnings' => $warnings,
                'complete' => $isComplete,
                'viewed_at' => $ack['viewed_at'] ?? null,
                'signed_at' => $ack['signed_at'] ?? null,
                'signed_name' => $ack['signed_name'] ?? null,
            ];
        }

        $total = count($results);
        $incomplete = $total - $completeCount;

        return $this->response->setJSON([
            'ok' => true,
            'summary' => [
                'total' => $total,
                'complete' => $completeCount,
                'incomplete' => $incomplete,
                'warnings' => $warningCount,
            ],
            'students' => $results,
            'class_section_name' => $sectionName,
            'class_section_id' => $sectionCode,
            'school_year' => $year,
            'semester' => $sem,
            'roster_semester' => $rosterSemester,
            'used_fallback' => $usedFallback,
        ]);
    }

    /**
     * API: report card parent acknowledgement status
     * GET params: student_id, school_year, semester
     */
    public function reportCardAcknowledgement()
    {
        $studentId = (int) ($this->request->getGet('student_id') ?? 0);
        if ($studentId <= 0) {
            return $this->response->setJSON(['ok' => false, 'error' => 'Missing student_id'])->setStatusCode(400);
        }
        $schoolYear = trim((string) ($this->request->getGet('school_year') ?? $this->schoolYear ?? ''));
        $semester = trim((string) ($this->request->getGet('semester') ?? $this->semester ?? ''));

        $row = $this->ackModel
            ->where('student_id', $studentId)
            ->where('school_year', $schoolYear)
            ->where('semester', $semester)
            ->orderBy('updated_at', 'DESC')
            ->first();

        return $this->response->setJSON([
            'ok' => true,
            'student_id' => $studentId,
            'school_year' => $schoolYear,
            'semester' => $semester,
            'viewed_at' => $row['viewed_at'] ?? null,
            'signed_at' => $row['signed_at'] ?? null,
            'signed_name' => $row['signed_name'] ?? null,
        ]);
    }

    protected function fetchStudentsByClass(int $sectionId, ?string $schoolYear)
    {
        $b = $this->studentClassModel
            ->select('s.id, s.firstname, s.lastname, s.registration_grade, s.gender')
            ->join('students s', 's.id = student_class.student_id', 'inner')
            ->where('student_class.class_section_id', $sectionId)
            ->where('s.is_active', 1)
            ->orderBy('s.firstname', 'ASC')
            ->orderBy('s.lastname', 'ASC');

        if (!empty($schoolYear)) {
            $b->where('student_class.school_year', $schoolYear);
        }

        return $b->findAll();
    }

    protected function formatReportPDF($pdf, $data)
    {
        $w = $pdf->GetPageWidth();
        // Layout helpers (mirroring the shared StudentReportPDF style but using DB data)
        $pdf->SetMargins(10, 10, 10);
        $bottomMarginVal = 3;
        $pdf->SetAutoPageBreak(true, $bottomMarginVal);
        $pdf->AddPage('P', 'Letter');

        $leftMargin = 10;

        $leftLogo = $this->firstExisting([
            FCPATH . 'images/Isgl_logo.png',
            FCPATH . 'images/isgl_logo.png',
            FCPATH . 'assets/images/isgl_logo.png',
            FCPATH . 'assets/images/isgl.png',
        ]);
        $rightLogo = $this->firstExisting([
            FCPATH . 'images/logo.png',
            FCPATH . 'assets/images/logo.png',
            FCPATH . 'assets/images/school_logo.png',
        ]);

        if ($leftLogo)  { $pdf->Image($leftLogo, 5, 5, 32); }
        if ($rightLogo) { $pdf->Image($rightLogo, $w - 33, 5, 32); }

        $pdf->SetFont('Times', 'B', 24);
        $pdf->Cell(0, 12, 'Al Rahma Sunday School', 0, 1, 'C');
        $pdf->Cell(0, 12, 'Student Report Card', 0, 1, 'C');
        $pdf->Ln(4);

        $numFmt = static function ($val) {
            if ($val === null || $val === '') return 'N/A';
            if (is_numeric($val)) return number_format((float)$val, 1);
            return (string)$val;
        };
        $splitText = static function ($text, int $limit = 55): array {
            $text = trim((string)$text);
            if ($text === '') {
                return [' ', '']; // keep an extra blank line for spacing
            }
            $lines = explode("\n", wordwrap($text, $limit));
            $lines[] = ''; // extra empty line after the comment
            return $lines;
        };
        $drawLabeledCell = static function (\FPDF $pdf, string $label, string $value, float $width = 95) {
            $pdf->SetFont('Helvetica', 'B', 11);
            $pdf->Cell($width, 10, $label, 1, 0);
            $pdf->SetFont('Helvetica', '', 12);
            $pdf->Cell($width, 10, $value, 1, 1);
        };
        $firstNonNull = static function (...$items) {
            foreach ($items as $item) {
                if ($item !== null) {
                    return $item;
                }
            }
            return null;
        };
        $wrapLinesToWidth = static function (\FPDF $pdf, string $text, float $width) {
            $text = trim((string)$text);
            if ($text === '') {
                return [' '];
            }
            if ($width <= 0) {
                return [$text];
            }
            $segments = preg_split("/\\r?\\n+/", $text);
            $lines = [];
            foreach ($segments as $seg) {
                $seg = trim($seg);
                if ($seg === '') {
                    $lines[] = ' ';
                    continue;
                }
                $words = preg_split('/\\s+/u', $seg);
                $current = '';
                foreach ($words as $word) {
                    $trial = trim($current === '' ? $word : ($current . ' ' . $word));
                    if ($pdf->GetStringWidth($trial) <= $width) {
                        $current = $trial;
                    } else {
                        if ($current !== '') $lines[] = $current;
                        $current = $word;
                    }
                }
                if ($current !== '') $lines[] = $current;
            }
            return $lines;
        };
        $draw3ColumnRow = static function (\FPDF $pdf, string $label, $score, $feedback) use ($wrapLinesToWidth) {
            $w1 = 55;
            $w2 = 30;
            $w3 = 110; // comments column width
            $commentWrapW = $w3 - 4; // allow more horizontal space for comments
            $lineHeight = 6;

            // Wrap using the same font settings as the comment cell to avoid odd line breaks
            $pdf->SetFont('Helvetica', '', 11);
            $cellMargin = 1.0; // FPDF default internal cell margin (protected property)
            $wrapWidth = max(1, $commentWrapW - (2 * $cellMargin));
            $lines = $wrapLinesToWidth($pdf, (string)$feedback, $wrapWidth);
            if (trim((string)$feedback) !== '') {
                $lines[] = ' ';
            }
            $linesCount = max(1, count($lines));
            $rowHeight = max($lineHeight, $linesCount * $lineHeight);
            $textOffsetY = ($rowHeight - ($linesCount * $lineHeight)) / 2;

            $startX = $pdf->GetX();
            $startY = $pdf->GetY();
            $labelPad = 2;

            // Label cell
            $pdf->SetFont('Helvetica', 'B', 11);
            $pdf->SetXY($startX + $labelPad, $startY + $textOffsetY);
            $pdf->Cell($w1 - $labelPad, $lineHeight, $label, 0, 0);

            // Score cell
            $pdf->SetFont('Helvetica', '', 12);
            $scoreStr = is_numeric($score) ? number_format((float)$score, 1) : ((string)$score !== '' ? (string)$score : 'N/A');
            $pdf->SetXY($startX + $w1, $startY + $textOffsetY);
            $pdf->Cell($w2, $lineHeight, $scoreStr, 0, 0, 'C');

            // Comments cell
            $commentX = $pdf->GetX();
            $pdf->SetFont('Helvetica', '', 11);
            $pdf->SetXY($commentX + 2, $startY + $textOffsetY);
            $pdf->MultiCell($commentWrapW, $lineHeight, implode("\n", $lines), 0, 'L');

            // Advance to next row
            $pdf->SetXY($startX, $startY + $rowHeight);
        };
        $drawInfoRows = static function (\FPDF $pdf, array $rows, float $height = 12, ?float $startY = null) use ($leftMargin) {
            $leftW = 130; // Teacher/Name column widened by 10
            $rightW = 65; // School Year column reduced by 10
            $startX = $leftMargin; // ensure all rows start at left margin
            $currentY = $startY !== null ? $startY : $pdf->GetY();
            $lineH = 6;
            $wrapLines = static function (string $text, float $width) use ($pdf) {
                $text = trim($text);
                if ($text === '') {
                    return [' '];
                }
                $segments = preg_split('/\\r?\\n+/', $text);
                $out = [];
                foreach ($segments as $seg) {
                    $seg = trim($seg);
                    if ($seg === '') {
                        // Preserve intentional blank line
                        $out[] = ' ';
                        continue;
                    }
                    $words = preg_split('/\\s+/u', $seg);
                    $current = '';
                    foreach ($words as $word) {
                        $trial = $current === '' ? $word : ($current . ' ' . $word);
                        if ($pdf->GetStringWidth($trial) <= ($width - 2)) {
                            $current = $trial;
                        } else {
                            if ($current !== '') {
                                $out[] = $current;
                            }
                            $current = $word;
                        }
                    }
                    if ($current !== '') {
                        $out[] = $current;
                    }
                }
                return !empty($out) ? $out : [' '];
            };

            if ($startY !== null) {
                $pdf->SetY($startY);
            }
            foreach ($rows as $row) {
                if (!is_array($row) || count($row) < 4) {
                    continue;
                }
                [$labelLeft, $valueLeft, $labelRight, $valueRight] = $row;
                $y = $currentY;
                $labelY = $y+2; // align titles and contents vertically
                $isTeacherRow = stripos($labelLeft, 'teacher') !== false;
                if ($isTeacherRow) {
                    $labelY += 1;
                }
                // For teacher rows, respect the explicit line breaks (two names per line) without extra wrapping
                $leftLines  = $isTeacherRow
                    ? array_values(array_filter(array_map('rtrim', explode("\n", (string)$valueLeft)), static fn($v) => $v !== ''))
                    : $wrapLines((string)$valueLeft,  $leftW - 6);
                $rightLines = $wrapLines((string)$valueRight, $rightW - 6);
                $rowHeight = max($height, max(count($leftLines), count($rightLines)) * $lineH + 4);
                // If teacher names span multiple lines, add a small breathing room (half line) after the second line
                if (stripos($labelLeft, 'teacher') !== false && count($leftLines) > 1) {
                    $rowHeight += ($lineH / 4);
                }
                $pdf->SetXY($startX, $y);
                $pdf->Rect($startX, $y, $leftW, $rowHeight);
                $pdf->Rect($startX + $leftW, $y, $rightW, $rowHeight);
                $pdf->SetFont('Helvetica', 'B', 11);
                $pdf->SetXY($startX + 3, $labelY);
                $pdf->Write($lineH - 1, $labelLeft);
                $pdf->SetFont('Arial', '', 11);
                $labelLeftWidth = $pdf->GetStringWidth($labelLeft);
                $pad = 2; // small gap after the label
                $valLeftWidth = $leftW - 6 - $labelLeftWidth - $pad;
                if ($valLeftWidth < 10) {
                    $valLeftWidth = $leftW - 6 - $pad;
                }
                $pdf->SetXY($startX + 3 + $labelLeftWidth + $pad, $labelY);
                if (count($leftLines) === 1) {
                    $pdf->Write($lineH - 1, $leftLines[0]);
                } else {
                    $pdf->MultiCell($valLeftWidth, $lineH, implode("\n", $leftLines), 0, 'L');
                }
                $pdf->SetFont('Helvetica', 'B', 11);
                $pdf->SetXY($startX + $leftW + 3, $labelY);
                $pdf->Write($lineH - 1, $labelRight);
                $pdf->SetFont('Arial', '', 11);
                $labelRightWidth = $pdf->GetStringWidth($labelRight);
                $valRightWidth = $rightW - 6 - $labelRightWidth - $pad;
                if ($valRightWidth < 10) {
                    $valRightWidth = $rightW - 6 - $pad;
                }
                $pdf->SetXY($startX + $leftW + 3 + $labelRightWidth + $pad, $labelY);
                if (count($rightLines) === 1) {
                    $pdf->Write($lineH - 1, $rightLines[0]);
                } else {
                    $pdf->MultiCell($valRightWidth, $lineH, implode("\n", $rightLines), 0, 'L');
                }
                $currentY += $rowHeight;
                $pdf->SetY($currentY);
            }
            return $currentY;
        };

        $semRaw = (string)($data['score']['semester'] ?? ($data['selected_semester'] ?? ''));
        $semNum = null;
        $semFriendly = 'Second Semester';
        $s = strtolower(trim($semRaw));
        if ($s === 'fall' || $s === 'first' || $s === 'semester 1' || $s === '1') { $semNum = 1; $semFriendly = 'First Semester'; }
        elseif ($s === 'spring' || $s === 'second' || $s === 'semester 2' || $s === '2') { $semNum = 2; $semFriendly = 'Second Semester'; }

        // Teacher names (support multiple main teachers + wrap to a second line if needed)
        $teacherNamesList = $data['teacher_names'] ?? [];
        if (empty($teacherNamesList) && !empty($data['teacher_name'])) {
            $teacherNamesList = [trim((string)$data['teacher_name'])];
        }
        $teacherNamesList = array_values(array_filter(
            array_map('trim', $teacherNamesList),
            static fn($v) => $v !== '' && strcasecmp($v, 'N/A') !== 0
        ));
        $tas = array_values(array_filter(
            array_map(static fn($v) => trim((string)$v), $data['ta_names'] ?? []),
            static fn($v) => $v !== '' && strcasecmp($v, 'N/A') !== 0
        ));
        $allTeacherNames = array_values(array_unique(array_filter(
            array_merge($teacherNamesList, $tas),
            static fn($v) => $v !== ''
        )));
        $teacherNameLines = [];
        $teacherCount = count($allTeacherNames);
        for ($i = 0; $i < $teacherCount; $i += 2) {
            $pair = array_slice($allTeacherNames, $i, 2);
            $isLastPair = ($i + 2) >= $teacherCount;
            if (count($pair) === 2) {
                $teacherNameLines[] = implode($isLastPair ? ' & ' : ', ', $pair);
            } else {
                $teacherNameLines[] = $pair[0];
            }
        }
        if (empty($teacherNameLines)) {
            $teacherNameLines[] = 'N/A';
        }
        $teacherNames = implode("\n", $teacherNameLines);

        $schoolYear = (string)($data['score']['school_year'] ?? ($data['score']['year'] ?? 'N/A'));
        if (preg_match('/^(\\d{4})-(\\d{4})$/', $schoolYear, $m)) {
            $schoolYear = $m[1] . '/' . $m[2];
        }
        $studentName = trim(($data['student']['firstname'] ?? '') . ' ' . ($data['student']['lastname'] ?? ''));
        $gradeLabel  = (string)($data['grade'] ?? ($data['class_section_name'] ?? 'N/A'));
        $today       = (string)($data['report_date_display'] ?? date('m-d-Y'));
        $termRank    = trim((string)($data['term_rank_display'] ?? ''));
        $firstSemScore  = $data['first_semester_score'] ?? null;
        $secondSemScore = $data['second_semester_score'] ?? ($data['total_score'] ?? null);
        $finalAverage   = $data['final_average'] ?? null;
        $comments       = $data['comments'] ?? [];

        $infoRow = function ($labelLeft, $valueLeft, $labelRight, $valueRight, $height = 12) use ($pdf) {
            $x = $pdf->GetX();
            $y = $pdf->GetY();
            $leftW = 115;
            $rightW = 68;
            $pdf->Rect($x, $y, $leftW, $height);
            $pdf->Rect($x + $leftW, $y, $rightW, $height);
            $pdf->SetFont('Helvetica', 'B', 11);
            $pdf->SetXY($x + 3, $y + 3);
            $pdf->Write(5, $labelLeft);
            $pdf->SetFont('Arial', '', 11);
            $pdf->Write(5, $valueLeft);
            $pdf->SetFont('Helvetica', 'B', 11);
            $pdf->SetXY($x + $leftW + 3, $y + 3);
            $pdf->Write(5, $labelRight);
            $pdf->SetFont('Arial', '', 11);
            $pdf->Write(5, $valueRight);
            $pdf->Ln($height);
        };

        // Student + teacher + grade (three stacked rows, edges touching)
        $afterInfoY = $drawInfoRows($pdf, [
            ["Teachers' Names: ", '  ' . ($teacherNames !== '' ? $teacherNames : 'N/A'), 'School Year: ', '  ' . $schoolYear],
            ['Student Name: ', '  ' . ($studentName !== '' ? $studentName : 'N/A'), 'Grade: ', '  ' . ($gradeLabel !== '' ? $gradeLabel : 'N/A')],
            ['Term: ', '  ' . $semFriendly, 'Date: ', '  ' . $today],
        ]);
        $pdf->SetY($afterInfoY);
        // No extra spacing to keep rectangles touching the next block

        $pdf->Ln(2);
        // Scores and comments rows
        $finalExamScore = $data['final_exam_score'] ?? null;
        if ($finalExamScore === null) {
            if ($semNum === 1) {
                $finalExamScore = $data['score']['midterm_exam_score'] ?? null;
            } elseif ($semNum === 2) {
                $finalExamScore = $data['score']['final_exam_score'] ?? ($data['score']['midterm_exam_score'] ?? null);
            } else {
                $finalExamScore = $data['score']['final_exam_score'] ?? ($data['score']['midterm_exam_score'] ?? null);
            }
        }
        $ptapScore      = $data['ptap'] ?? $data['score']['ptap_score'] ?? null;
        $attendance     = $data['score']['attendance_score'] ?? null;

        $examLabel = ($semNum === 1) ? 'Midterm Exam*' : 'Final Exam*';
        // Header for subject table
        $pdf->SetFont('Helvetica', 'B', 11);
        $headerX = $pdf->GetX();
        $headerY = $pdf->GetY();
        $pdf->Cell(55, 15, 'Subject', 1, 0, 'C');
        $scoreHeader = $semNum === 1 ? "1st Semester\nScore (/100)" : "2nd Semester\nScore (/100)";
        $pdf->SetXY($headerX + 55, $headerY);
        $pdf->MultiCell(30, 7.5, $scoreHeader, 1, 'C');
        $pdf->SetXY($headerX + 85, $headerY);
        $pdf->Cell(110, 15, "Teachers' Comments", 1, 1, 'C');

        // Match comment to the correct row
        $examComment = $semNum === 1
            ? $firstNonNull($comments['midterm'] ?? null, $data['score']['midterm_comment'] ?? null, $data['score']['comment'] ?? null)
            : $firstNonNull($comments['final'] ?? null, $data['score']['final_comment'] ?? null, $data['score']['comment'] ?? null);
        $ptapComment = $firstNonNull($comments['ptap'] ?? null, $data['score']['ptap_comment'] ?? null);
        $attendanceComment = $firstNonNull(
            $comments['attendance'] ?? null,
            $comments['attendance_comment'] ?? null,
            $data['score']['attendance_comment'] ?? null
        );

        // Add a blank line before the exam row to separate header from data
        $pdf->Ln(2);
        $draw3ColumnRow($pdf, $examLabel, $numFmt($finalExamScore), $examComment ?? '');
        $draw3ColumnRow($pdf, 'PTAP**', $numFmt($ptapScore), $ptapComment ?? '');
        $attendanceComment = $firstNonNull(
            $comments['attendance'] ?? null,
            $comments['attendance_comment'] ?? null,
            $data['score']['attendance_comment'] ?? null
        );
        $draw3ColumnRow($pdf, 'Attendance***', $numFmt($attendance), $attendanceComment ?? '');

        // Draw outer box and vertical dividers around the score/comment block (no horizontal separators)
        $rowsStartX = $headerX;
        $rowsStartY = $headerY + 15; // header height
        $rowsEndY = $pdf->GetY();
        $blockHeight = $rowsEndY - $rowsStartY;
        $blockWidth = 195; // 55 + 30 + 110
        $pdf->Rect($rowsStartX, $rowsStartY, $blockWidth, $blockHeight);
        $pdf->Line($rowsStartX + 55, $rowsStartY, $rowsStartX + 55, $rowsStartY + $blockHeight);
        $pdf->Line($rowsStartX + 85, $rowsStartY, $rowsStartX + 85, $rowsStartY + $blockHeight);

        // Attendance summary (absences / tardies)
        $totalDays   = $data['total_attendance_days'] ?? $data['score']['total_semester_days'] ?? $data['score']['total_days'] ?? '-';
        $absences    = $data['score']['total_absences'] ?? $data['score']['absences'] ?? '0';
        $tardies     = $data['score']['total_tardies'] ?? $data['score']['tardies'] ?? '0';

        $pdf->Ln(2);
        // Attendance summary on a single row (three columns)
        $statW = 65;
        $statH = 12;
        $startX = $pdf->GetX();
        $startY = $pdf->GetY();
        $stats = [
            ['Total Semester Days: ', (string)$totalDays],
            ['Total Absences: ', (string)$absences],
            ['Tardies (Unjustified): ', (string)$tardies],
        ];
        foreach ($stats as $i => [$lbl, $val]) {
            $x = $startX + ($i * $statW);
            $pdf->Rect($x, $startY, $statW, $statH);
            $pdf->SetXY($x + 2, $startY + 3);
            $pdf->SetFont('Helvetica', 'B', 11);
            $pdf->Write(5, $lbl . ' ');
            $pdf->SetFont('Helvetica', '', 11);
            $pdf->Write(5, $val);
        }
        $pdf->SetY($startY + $statH);

        // Semester scores + final
        $effectiveSecond = $secondSemScore ?? $data['score']['semester_score'] ?? $data['total_score'] ?? null;
        $finalScoreVal = $finalAverage;
        if (!is_numeric($finalScoreVal)) {
            $finalScoreVal  = (is_numeric($firstSemScore) && is_numeric($effectiveSecond))
                ? number_format(((float)$firstSemScore + (float)$effectiveSecond) / 2, 1)
                : $numFmt($effectiveSecond);
        }
        // Keep grade label and value within bordered cells
        $gradeCellWidth = 65; // match Total Semester Days column width
        $gradeCellHeight = 12;
        $gradeX = $pdf->GetX();
        $gradeY = $pdf->GetY();
        $gradePad = max(0, 2 - (4 * 0.3528)); // reduce indentation by 4pt

        $drawGradeCell = static function (
    \FPDF $pdf,
    float $x,
    float $y,
    float $w,
    float $h,
    string $label,
    string $value,
    float $pad
) {
    $pdf->Rect($x, $y, $w, $h);
    $pdf->SetXY($x + $pad, $y + 3);
    $pdf->SetFont('Helvetica', 'B', 11);
    $pdf->Write(5, $label . ' ');
    $labelWidth = $pdf->GetStringWidth($label . ' ');
    $pdf->SetFont('Helvetica', '', 12);
    $pdf->SetXY($x + 2 + $labelWidth, $y + 3);
    $pdf->Write(5, $value);
};
$drawRankCell = static function (
    \FPDF $pdf,
    float $x,
    float $y,
    float $w,
    float $h,
    string $rankValue,
    float $pad
) {
    $rankValue = trim($rankValue) !== '' ? trim($rankValue) : 'N/A';

    $pdf->Rect($x, $y, $w, $h);
    $pdf->SetXY($x + $pad, $y + 3);
    $pdf->SetFont('Helvetica', 'B', 11);
    $pdf->Write(5, ' Class Rank: ');

    $labelWidth = $pdf->GetStringWidth(' Class Rank: ');
    $pdf->SetFont('Helvetica', '', 12);
    $pdf->SetXY($x + 2 + $labelWidth, $y + 3);
    $pdf->Write(5, $rankValue);
};
if ($semNum === 2) {
    $firstLabel = ' 1st Semester Grade:';
    $firstValue = $numFmt($firstSemScore) . '/100';

    $secondLabel = '  2nd Semester Grade:';
    $secondValue = $numFmt($effectiveSecond) . '/100';

    $drawGradeCell($pdf, $gradeX, $gradeY, $gradeCellWidth, $gradeCellHeight, $firstLabel, $firstValue, $gradePad);
    $drawGradeCell($pdf, $gradeX + $gradeCellWidth, $gradeY, $gradeCellWidth, $gradeCellHeight, $secondLabel, $secondValue, $gradePad);
} else {
    $gradeLabel = ' 1st Semester Grade:';
    $gradeValue = $numFmt($effectiveSecond) . '/100';

    $drawGradeCell($pdf, $gradeX, $gradeY, $gradeCellWidth, $gradeCellHeight, $gradeLabel, $gradeValue, $gradePad);

    // Fall: Ranking goes to the right of 1st Semester Grade.
    $drawRankCell($pdf, $gradeX + $gradeCellWidth, $gradeY, $gradeCellWidth, $gradeCellHeight, $termRank, $gradePad);
}

$pdf->SetY($gradeY + $gradeCellHeight);

$finalScoreRowHeight = 12;
$finalScoreEndY = null;

// Show Final Score only for second semester / Spring.
if ($semNum === 2) {
    $finalLabel = 'Final Score****:';
    $finalValue = (is_string($finalScoreVal) ? $finalScoreVal : $numFmt($finalScoreVal)) . '/100';

    $finalCellWidth = 65;
    $finalCellHeight = $finalScoreRowHeight;
    $finalX = $pdf->GetX();
    $finalY = $pdf->GetY();
    $finalPad = max(0, 2 - (4 * 0.3528));

    $drawGradeCell($pdf, $finalX, $finalY, $finalCellWidth, $finalCellHeight, '  ' . $finalLabel, $finalValue, $finalPad);

    // Spring: Ranking goes to the right of Final Score.
    $drawRankCell($pdf, $finalX + $finalCellWidth, $finalY, $finalCellWidth, $finalCellHeight, $termRank, $finalPad);

    $pdf->SetY($finalY + $finalCellHeight);
    $finalScoreEndY = $finalY + $finalCellHeight;
}

$scoresEndY = $pdf->GetY();

        // Legend anchored near bottom with a 3mm buffer (dynamic placement)
        $examLegendLabel = ($semNum === 1) ? 'Midterm Exam' : 'Final Exam';
        $legendLines = [
            "(*) {$examLegendLabel} (Weight: 60% of semester score)",
            "(**) PTAP - Participation, Tests, Assignments, Projects (Weight: 20%)",
            "(***) Attendance = ({$totalDays} - Total Absences + One Sick Day) / {$totalDays} ) x 100 (Weight: 20%)",
        ];
        if ($semNum === 2) {
            $legendLines[] = "(****) Final Score = (1st Semester Score + 2nd Semester Score) / 2";
        }
        $legendLines[] = ['text' => "If you have any questions, please contact the school via email at alrahma.isgl@gmail.com", 'bold' => true];
        $lineHeight = 4;
        $legendHeight = count($legendLines) * $lineHeight;
        $bottomPad = 0.1; // distance from bottom of the page

        // Respect the configured bottom margin so legend stays on-page
        $targetY = $pdf->GetPageHeight() - $bottomMarginVal - $bottomPad - $legendHeight;
        $targetY = max($pdf->GetY(), $targetY); // avoid overlapping prior content
        $legendY = $targetY;

        // Two-column layout: legend on left, signature block on right
        $marginL = 10;
        $sigWidth = 40;
        $sigHeight = $finalScoreRowHeight;
        $sigX = $w - $sigWidth - 15;
        $legendWidth = $sigX - $marginL - 5; // leave gutter before signature

        // Legend (left column)
        $pdf->SetXY($marginL, $legendY);
        foreach ($legendLines as $line) {
            $isBold = is_array($line) ? ($line['bold'] ?? false) : false;
            $text = is_array($line) ? ($line['text'] ?? '') : $line;
            $pdf->SetFont('Arial', $isBold ? 'B' : '', 8);
            $pdf->MultiCell($legendWidth, $lineHeight, $text, 0, 'L');
        }
        $legendEndY = $pdf->GetY();

        // Signature block (right column), bottom-aligned to the score block
        $pdf->SetFont('Times', 'BU', 16);
        $labelHeight = $finalScoreRowHeight;

        $sigPath = $this->firstExisting([
            FCPATH . 'images/signature.png',
            FCPATH . 'assets/images/signature.png',
            WRITEPATH . 'report_assets/signature.png',
        ]);
        $signatureBlockHeight = $labelHeight + ($sigPath ? $sigHeight : 0);
        $anchorEndY = ($semNum === 2 && $finalScoreEndY !== null) ? $finalScoreEndY : $scoresEndY;
        $sigGap = 2;
        $sigY = $anchorEndY + $sigGap;

        $pdf->SetXY($sigX, $sigY);
        $pdf->Cell($sigWidth + 5, $labelHeight, "School Official", 0, 0, "R");

        $signatureEndY = $sigY + $labelHeight;
        if ($sigPath) {
            $imgY = $sigY + $labelHeight;
            $pdf->Image($sigPath, $sigX+3, $imgY-2, $sigWidth+2, $sigHeight+5);
            $signatureEndY = $imgY + $sigHeight;
        }

        // Advance cursor to the lower of legend or signature blocks plus small padding
        $pdf->SetY(max($legendEndY, $signatureEndY) + 4);
    }

    public function generateSingleReport($studentId)
    {
        // Prevent Debug Toolbar from corrupting PDF
        if (ENVIRONMENT !== 'production') {
            // Turn off toolbar manually by unsetting the collector
            unset(service('toolbar')->collectors['CodeIgniter\Debug\Toolbar\Collectors\Timers']);
        }

        $download = $this->request->getGet('download') === '1';
        $schoolYear = $this->request->getGet('school_year') ?? $this->schoolYear;
        $semester   = $this->request->getGet('semester')   ?? $this->semester;
        $reportDate = $this->sanitizeReportDate($this->request->getGet('report_date'));
        $data = $this->prepareStudentReportData((int)$studentId, (string)$schoolYear, (string)$semester);

        if (!$data) {
            return "Student not found or missing scores.";
        }
        $data['report_date'] = $reportDate['iso'];
        $data['report_date_display'] = $reportDate['display'];

        $pdf = new \FPDF('P', 'mm', 'Letter');
        $this->formatReportPDF($pdf, $data);

        $filename = 'ReportCard_' . $data['student']['lastname'] . '.pdf';

        // Important: Clean output buffer to prevent PDF corruption
        if (ob_get_length()) {
            ob_end_clean();
        }
        $pdfContent = $pdf->Output('S');
        $disposition = $download ? 'attachment' : 'inline';
        return $this->response
            ->setHeader('Content-Type', 'application/pdf')
            ->setHeader('Content-Disposition', $disposition . '; filename="' . $filename . '"')
            ->setHeader('Cache-Control', 'private, max-age=0, must-revalidate')
            ->setHeader('Pragma', 'public')
            ->setHeader('Content-Length', (string) strlen($pdfContent))
            ->setBody($pdfContent);
    }

    public function generateClassReport($classSectionId)
    {
        // Disable toolbar output to prevent PDF corruption
        if (ENVIRONMENT !== 'production') {
            unset(service('toolbar')->collectors['CodeIgniter\Debug\Toolbar\Collectors\Timers']);
        }


        $download = $this->request->getGet('download') === '1';
        $schoolYear = $this->request->getGet('school_year') ?? $this->schoolYear;
        $semester   = $this->request->getGet('semester')   ?? $this->semester;
        $reportDate = $this->sanitizeReportDate($this->request->getGet('report_date'));

        $q = $this->semesterScoreModel
            ->select('semester_scores.*')
            ->join('students s', 's.id = semester_scores.student_id', 'inner')
            ->where('s.is_active', 1)
            ->where('semester_scores.class_section_id', (int)$classSectionId);
        if (!empty($schoolYear)) $q->where('semester_scores.school_year', (string)$schoolYear);
        if (!empty($semester)) {
            $this->applySemesterFilter($q, (string)$semester, 'semester_scores.semester');
        }
        $scores = $q
            ->orderBy('s.firstname', 'ASC')
            ->orderBy('s.lastname', 'ASC')
            ->findAll();

        if (!$scores) {
            return "No students found for this class section.";
        }

        $pdf = new \FPDF('P', 'mm', 'Letter');

        foreach ($scores as $score) {
            $studentId = $score['student_id'];

            $data = $this->prepareStudentReportData((int)$studentId, (string)$schoolYear, (string)$semester);

            if ($data) {
                $data['report_date'] = $reportDate['iso'];
                $data['report_date_display'] = $reportDate['display'];
                $this->formatReportPDF($pdf, $data);
            }
        }

        $filename = 'ClassReport_Section_' . $classSectionId . '.pdf';

        // Clean any existing output buffer
        if (ob_get_length()) {
            ob_end_clean();
        }
        $pdfContent = $pdf->Output('S');
        $disposition = $download ? 'attachment' : 'inline';
        return $this->response
            ->setHeader('Content-Type', 'application/pdf')
            ->setHeader('Content-Disposition', $disposition . '; filename="' . $filename . '"')
            ->setHeader('Cache-Control', 'private, max-age=0, must-revalidate')
            ->setHeader('Pragma', 'public')
            ->setHeader('Content-Length', (string) strlen($pdfContent))
            ->setBody($pdfContent);
    }


    protected function normalizeSemester(?string $input): string
    {
        $s = strtolower(trim((string)$input));
        if ($s === 'fall' || $s === 'first' || str_contains($s, 'fall') || str_contains($s, '1')) return 'fall';
        if ($s === 'spring' || $s === 'second' || str_contains($s, 'spring') || str_contains($s, '2')) return 'spring';
        return '';
    }

    protected function semesterVariants(?string $semester): array
    {
        $raw = trim((string)$semester);
        if ($raw === '') {
            return [];
        }

        $norm = $this->normalizeSemester($raw);
        if ($norm === 'fall') {
            $vals = ['Fall', 'fall', 'First', 'first', 'Semester 1', 'semester 1', 'Semester1', 'semester1', 'Sem 1', 'sem 1', '1', '01', 'S1', 's1'];
        } elseif ($norm === 'spring') {
            $vals = ['Spring', 'spring', 'Second', 'second', 'Semester 2', 'semester 2', 'Semester2', 'semester2', 'Sem 2', 'sem 2', '2', '02', 'S2', 's2'];
        } else {
            $vals = [$raw];
        }
        $vals[] = $raw;

        return array_values(array_unique($vals));
    }

    protected function applySemesterFilter($builder, ?string $semester, string $field = 'semester'): void
    {
        $vals = $this->semesterVariants($semester);
        if (!empty($vals)) {
            $builder->whereIn($field, $vals);
        }
    }

    protected function applySemesterExclusion($builder, ?string $semester, string $field = 'semester'): void
    {
        $vals = $this->semesterVariants($semester);
        if (!empty($vals)) {
            $builder->whereNotIn($field, $vals);
        }
    }

    protected function listSundays(string $startDate, string $endDate): array
    {
        try {
            $start = new \DateTimeImmutable($startDate);
        } catch (\Throwable) {
            return [];
        }
        try {
            $end = new \DateTimeImmutable($endDate);
        } catch (\Throwable) {
            return [];
        }

        $sundays = [];
        $cursor = $start;
        $w = (int)$cursor->format('w');
        if ($w !== 0) {
            $cursor = $cursor->modify('next sunday');
        }

        while ($cursor <= $end) {
            $sundays[] = $cursor->format('Y-m-d');
            $cursor = $cursor->modify('+7 days');
        }
        return $sundays;
    }

    protected function resolveAnchorSunday(): string
    {
        $tzName = (string) (config('School')->attendance['timezone'] ?? user_timezone());
        try {
            $tzObj = new \DateTimeZone($tzName ?: 'UTC');
        } catch (\Throwable) {
            try {
                $tzObj = new \DateTimeZone(user_timezone() ?: 'UTC');
            } catch (\Throwable) {
                $tzObj = new \DateTimeZone('UTC');
            }
        }
        try {
            $now = new \DateTime('now', $tzObj);
        } catch (\Throwable) {
            $now = new \DateTime('now');
        }
        $weekday = (int)$now->format('w');
        if ($weekday === 0) {
            return $now->format('Y-m-d');
        }
        return $now->modify('next sunday')->format('Y-m-d');
    }
    protected function prepareStudentReportData(int $studentId, ?string $schoolYear = null, ?string $semester = null)
    {
        // 0) Student
        $student = $this->studentModel->find($studentId);
        if (!$student || (int)($student['is_active'] ?? 1) !== 1) return null;

        helper('attendance_comment');

        // 1) Resolve year/semester
        $refYear     = $schoolYear ?: ($this->schoolYear ?? '');
        $refSemester = $semester   ?: ($this->semester   ?? '');

        // 2) Grade(s) for the year (best effort)
        $grade = $this->studentClassModel->getClassSectionsByStudentId($studentId, $refYear);

        // 3) Pull the semester score (filtered if provided)
        $qb = $this->semesterScoreModel->where('student_id', $studentId);
        if ($refYear     !== '') $qb->where('school_year', $refYear);
        if ($refSemester !== '') {
            $this->applySemesterFilter($qb, $refSemester, 'semester');
        }
        $score = $qb->orderBy('updated_at', 'DESC')->orderBy('id', 'DESC')->first();
        if (!$score) return null;

        // ----------------------------
        // Resolve section PK and code
        // ----------------------------
        $sectionCode = (int)($score['class_section_id'] ?? 0); // may be code or PK (legacy)
        $sectionId   = null;

        if ($sectionCode > 0) {
            // Try as CODE first
            $row = $this->db->table('classSection')
                ->select('id, class_section_id, class_section_name')
                ->where('class_section_id', $sectionCode)->limit(1)->get()->getRowArray();
            if ($row) {
                $sectionId   = (int)$row['id'];
                $sectionCode = (int)$row['class_section_id'];
            } else {
                // Maybe score stored PK directly
                $row2 = $this->db->table('classSection')
                    ->select('id, class_section_id, class_section_name')
                    ->where('id', $sectionCode)->limit(1)->get()->getRowArray();
                if ($row2) {
                    $sectionId   = (int)$row2['id'];
                    $sectionCode = (int)$row2['class_section_id'];
                }
            }
        }

        if (!$sectionId || $sectionCode <= 0) {
            // Fallback to latest student_class for same year
            try {
                $scRow = $this->db->table('student_class')
                    ->select('class_section_id')
                    ->where('student_id', $studentId)
                    ->where('school_year', (string)($score['school_year'] ?? $refYear))
                    ->orderBy('COALESCE(updated_at, created_at)', 'DESC', false)
                    ->limit(1)->get()->getRowArray();
                if (!empty($scRow['class_section_id'])) {
                    $sectionCode = (int)$scRow['class_section_id'];
                    $row = $this->db->table('classSection')
                        ->select('id')->where('class_section_id', $sectionCode)
                        ->limit(1)->get()->getRowArray();
                    if ($row) $sectionId = (int)$row['id'];
                }
            } catch (\Throwable $e) { /* ignore */ }
        }

        // ----------------------------
        // Teacher & TA lookup (single source of truth)
        // ----------------------------
        $teacherName = 'N/A';
        $teacherNamesList = [];
        $taNames     = [];

        // Prefer the section CODE (what teacher_class stores) and fall back to PK if needed
        if ($sectionCode > 0) {
            $names = $this->resolveTeacherAndTAs((int)$sectionCode, $refYear, $refSemester);
            $teacherName = $names['teacher_name'];
            $taNames     = $names['ta_names'];
            $teacherNamesList = $names['teacher_names'] ?? [];
        }
        // If code lookup failed or is empty, try the PK (legacy data may store either)
        if (($teacherName === 'N/A' || empty($taNames)) && $sectionId) {
            $names = $this->resolveTeacherAndTAs((int)$sectionId, $refYear, $refSemester);
            if ($teacherName === 'N/A') {
                $teacherName = $names['teacher_name'];
            }
            if (empty($taNames)) {
                $taNames = $names['ta_names'];
            }
            if (empty($teacherNamesList) && !empty($names['teacher_names'])) {
                $teacherNamesList = $names['teacher_names'];
            }
        }

        $taNames = array_values(array_unique(array_filter($taNames)));
        $taLine  = implode(', ', $taNames);

        // Fallback: if no teacher assignment found, try the user who updated the score
        if (($teacherName === 'N/A' || trim((string)$teacherName) === '') && !empty($score['updated_by'])) {
            try {
                $updId = (int)$score['updated_by'];
                if ($updId > 0) {
                    $u = $this->userModel->find($updId);
                    if ($u) {
                        $fallbackName = trim(((string)($u['firstname'] ?? '')) . ' ' . ((string)($u['lastname'] ?? '')));
                        if ($fallbackName !== '') {
                            log_message(
                                'warning',
                                'ReportCard: No teacher assignment found; using updated_by as teacher. section_id={sectionId} section_code={sectionCode} year={year} sem={sem} updated_by={uid} name={name}',
                                [
                                    'sectionId'   => $sectionId,
                                    'sectionCode' => $sectionCode,
                                    'year'        => (string)($score['school_year'] ?? $refYear),
                                    'sem'         => (string)($score['semester'] ?? $refSemester),
                                    'uid'         => $updId,
                                    'name'        => $fallbackName,
                                ]
                            );
                            $teacherName = $fallbackName;
                        }
                    }
                }
            } catch (\Throwable $e) {
                // ignore fallback errors
            }
        }

        // ----------------------------
        // Class section name (display)
        // ----------------------------
        $classSectionName = 'N/A';
        if ($sectionId) {
            $cs = $this->classSectionModel->find($sectionId);
            if (!empty($cs['class_section_name'])) $classSectionName = $cs['class_section_name'];
        } elseif ($sectionCode > 0) {
            $cs = $this->db->table('classSection')->select('class_section_name')
                ->where('class_section_id', $sectionCode)->limit(1)->get()->getRowArray();
            if (!empty($cs['class_section_name'])) $classSectionName = $cs['class_section_name'];
        }

        // ----------------------------
        // Names & scores
        // ----------------------------
        $studentName = trim(($student['firstname'] ?? '') . ' ' . ($student['lastname'] ?? ''));
        $studentFirstName = trim((string)($student['firstname'] ?? ''));

        $num = fn($v) => is_numeric($v) ? (float)$v : null;
        $hw  = $num($score['homework_avg']        ?? null) ?? 0.0;
        $qz  = $num($score['quiz_avg']            ?? null) ?? 0.0;
        $prj = $num($score['project_avg']         ?? null) ?? 0.0;
        $tst = $num($score['test_avg']            ?? null) ?? 0.0;
        $semesterForAttendance = $refSemester !== '' ? $refSemester : (string)($score['semester'] ?? '');
        $normSemester = $this->normalizeSemester($semesterForAttendance);
        if ($normSemester === 'spring') {
            $finalExam = $num($score['final_exam_score'] ?? null);
            if ($finalExam === null) {
                $finalExam = $num($score['midterm_exam_score'] ?? null);
            }
        } elseif ($normSemester === 'fall') {
            $finalExam = $num($score['midterm_exam_score'] ?? null);
        } else {
            $finalExam = $num($score['final_exam_score']  ?? $score['midterm_exam_score'] ?? null);
        }
        $att = $num($score['attendance_score']    ?? null);

        $ptap = $num($score['ptap_score'] ?? null);
        if ($ptap === null) {
            $ptap = round((($hw + $qz + $prj + $tst) / 4), 1);
        }
        $ptap = max(0, min(100, $ptap));

        $secondSemesterScore = $num($score['semester_score'] ?? null);
        if ($secondSemesterScore === null && $finalExam !== null && $att !== null) {
            $secondSemesterScore = round(($finalExam * 0.6) + ($ptap * 0.2) + ($att * 0.2), 1);
        }
        if ($secondSemesterScore !== null) {
            $secondSemesterScore = max(0, min(100, $secondSemesterScore));
        }

        // Pick up comments from score_comments if available
        $commentMap = [];
        try {
            $commentBuilder = $this->scoreCommentModel
                ->where('student_id', $studentId)
                ->where('school_year', $refYear)
                ->whereIn('score_type', ['final', 'midterm', 'ptap', 'attendance', 'attendance_comment']);
            if ($refSemester !== '') {
                $this->applySemesterFilter($commentBuilder, $refSemester, 'semester');
            }
            $commentRows = $commentBuilder->findAll();
            foreach ($commentRows as $row) {
                $typeRaw = strtolower(trim((string)($row['score_type'] ?? '')));
                if ($typeRaw === '') {
                    continue;
                }
                // Normalize common variants to a single key
                if ($typeRaw === 'attendance_comment') {
                    $typeRaw = 'attendance';
                }
                $reviewVal  = trim((string)($row['comment_review'] ?? ''));
                $commentVal = $this->db->fieldExists('comment_review', 'score_comments')
                    ? $reviewVal
                    : trim((string)($row['comment'] ?? ''));
                if ($commentVal === '') {
                    continue;
                }
                $commentMap[$typeRaw] = $commentVal;
            }
        } catch (\Throwable $e) {
            // ignore comment failures
        }

        // Expose attendance comment alongside scores for easier PDF fallback
        if (isset($commentMap['attendance']) && !isset($score['attendance_comment'])) {
            $score['attendance_comment'] = $commentMap['attendance'];
        }

        // If attendance comment is still missing, auto-generate from attendance score for the PDF
        $attendanceCommentVal = $commentMap['attendance'] ?? $score['attendance_comment'] ?? null;
        if ((!is_string($attendanceCommentVal) || trim($attendanceCommentVal) === '') && $att !== null) {
            $autoAttendance = attendance_comment_from_score($att, $studentFirstName ?? '');
            if ($autoAttendance !== null) {
                $commentMap['attendance'] = $autoAttendance;
                if (!isset($score['attendance_comment'])) {
                    $score['attendance_comment'] = $autoAttendance;
                }
            }
        }

        // First semester score (for second-semester reports) by looking for any other term in the same year
        $firstSemesterScore = null;
        try {
            $other = $this->semesterScoreModel
                ->where('student_id', $studentId)
                ->where('school_year', $refYear);
            if ($refSemester !== '') {
                $this->applySemesterExclusion($other, $refSemester, 'semester');
            }
            $other = $other
                ->orderBy('updated_at', 'DESC')
                ->orderBy('id', 'DESC')
                ->first();
            if ($other && is_numeric($other['semester_score'] ?? null)) {
                $firstSemesterScore = (float)$other['semester_score'];
            }
        } catch (\Throwable $e) {
            // ignore
        }
        if ($firstSemesterScore === null && in_array(strtolower(trim((string)$refSemester)), ['fall', 'first', '1', 'semester 1'], true)) {
            $firstSemesterScore = $secondSemesterScore;
        }

        $rankingScore = $secondSemesterScore;
        if ($normSemester === 'spring' && is_numeric($firstSemesterScore) && is_numeric($secondSemesterScore)) {
            $rankingScore = round(((float)$firstSemesterScore + (float)$secondSemesterScore) / 2, 1);
        }

        $termRanking = $this->calculateTermRanking(
            $studentId,
            $sectionCode,
            $sectionId,
            $refYear,
            $refSemester !== '' ? $refSemester : (string)($score['semester'] ?? ''),
            $rankingScore
        );

        // Total semester days from attendance records (max total_attendance within same term)
        $totalSemesterDays = null;

        if ($refYear !== '' && $normSemester !== '') {
            $semRange = $this->semesterRangeService->getSemesterRange($refYear, ucfirst($normSemester));
            if ($semRange) {
                try {
                    // Fetch all events for the year (no semester filter) so that
                    // no-school events stored with a different semester label or
                    // NULL semester are still picked up. Date-range filtering below.
                    $events = $this->calendarModel->getEventsBySchoolYearAndSemester($refYear, null);
                    $noSchoolDays = [];
                    foreach ($events as $event) {
                        if (empty($event['no_school'])) {
                            continue;
                        }
                        $dateStr = substr((string)($event['date'] ?? ''), 0, 10);
                        if ($dateStr === '' || $dateStr < $semRange[0] || $dateStr > $semRange[1]) {
                            continue;
                        }
                        $noSchoolDays[$dateStr] = true;
                    }
                    $sundays = $this->listSundays($semRange[0], $semRange[1]);
                    $limit = $semRange[1];
                    // Only cap at "today" while the semester is still in progress.
                    // Once the semester end date has passed, count all its Sundays.
                    if ($semRange[1] > date('Y-m-d')) {
                        $anchor = $this->resolveAnchorSunday();
                        if ($anchor !== '' && $anchor >= $semRange[0]) {
                            $limit = min($anchor, $semRange[1]);
                        }
                    }
                    $totalSemesterDays = 0;
                    foreach ($sundays as $date) {
                        if ($date > $limit) {
                            continue;
                        }
                        if (!empty($noSchoolDays[$date])) {
                            continue;
                        }
                        $totalSemesterDays++;
                    }
                } catch (\Throwable $e) {
                    log_message('error', 'Failed to count sundays for report card: ' . $e->getMessage());
                    $totalSemesterDays = null;
                }
            }
        }

        if ($totalSemesterDays === null) {
            try {
                $attRows = $this->attendanceRecordModel
                    ->select('total_attendance')
                    ->where('student_id', $studentId)
                    ->where('school_year', $refYear);
                if ($semesterForAttendance !== '') {
                    $this->applySemesterFilter($attRows, $semesterForAttendance, 'semester');
                }
                $vals = array_values(array_filter(array_map(
                    static fn($r) => isset($r['total_attendance']) ? (int)$r['total_attendance'] : null,
                    $attRows->findAll()
                ), static fn($v) => $v !== null));
                if (!empty($vals)) {
                    $totalSemesterDays = max($vals);
                }
            } catch (\Throwable $e) {
                // ignore attendance lookup errors
            }
        }

        // Load attendance sums (absences, lates)
        $attendanceTotals = [
            'total_absences' => 0,
            'total_tardies'  => 0,
        ];
        try {
            $attendanceDataModel = new AttendanceDataModel();
            $absences = $attendanceDataModel
                ->where('student_id', $studentId)
                ->where('school_year', $refYear)
                ->where('status', 'absent');
            if ($semesterForAttendance !== '') {
                $this->applySemesterFilter($absences, $semesterForAttendance, 'semester');
            }
            $attendanceTotals['total_absences'] = $absences->countAllResults();

            $lates = $attendanceDataModel
                ->where('student_id', $studentId)
                ->where('school_year', $refYear)
                ->where('status', 'late');
            if ($semesterForAttendance !== '') {
                $this->applySemesterFilter($lates, $semesterForAttendance, 'semester');
            }
            $attendanceTotals['total_tardies'] = $lates->countAllResults();
        } catch (\Throwable $e) {
            // ignore attendance lookup errors
        }

        if ($score) {
            $score['total_absences'] = $attendanceTotals['total_absences'];
            $score['total_tardies']  = $attendanceTotals['total_tardies'];
        }

        $finalAverage = null;
        if (is_numeric($firstSemesterScore) && is_numeric($secondSemesterScore)) {
            $finalAverage = number_format(((float)$firstSemesterScore + (float)$secondSemesterScore) / 2, 1);
        }

        return [
            'student'             => $student,
            'student_name'        => ($studentName !== '' ? $studentName : 'N/A'),
            'teacher_name'        => ($teacherName !== '' ? $teacherName : 'N/A'),
            'teacher_names'       => array_values(array_unique(array_filter($teacherNamesList))),
            'ta_names'            => $taNames,
            'ta_names_line'       => ($taLine !== '' ? $taLine : 'N/A'),
            'class_section_name'  => $classSectionName,
            'class_section_code'  => $sectionCode ?: null,
            'class_section_id'    => $sectionId   ?: null,
            'selected_semester'   => $refSemester,
            'grade'               => $grade,
            'score'               => $score,
            'ptap'                => $ptap,
            'final_exam_score'    => $finalExam,
            'second_semester_score' => $secondSemesterScore,
            'first_semester_score'  => $firstSemesterScore,
            'final_average'         => $finalAverage,
            'term_rank'             => $termRanking,
            'term_rank_display'     => $termRanking['display'] ?? null,
            'comments'              => $commentMap,
            'total_score'         => $secondSemesterScore,
            'total_attendance_days' => $totalSemesterDays,
        ];
    }

private function calculateTermRanking(
    int $studentId,
    int $sectionCode,
    ?int $sectionId,
    string $schoolYear,
    ?string $semester,
    ?float $studentScore
): ?array {
    if ($studentId <= 0 || $schoolYear === '' || $studentScore === null) {
        return null;
    }

    $sectionIds = array_values(array_unique(array_filter([
        $sectionCode > 0 ? $sectionCode : null,
        $sectionId && $sectionId > 0 ? $sectionId : null,
    ])));

    if (empty($sectionIds)) {
        return null;
    }

    $semesterForRank  = trim((string)$semester);
    $rankByFinalScore = $this->normalizeSemester($semesterForRank) === 'spring';

    $builder = $this->db->table('semester_scores ss')
        ->select('ss.student_id, ss.semester, ss.semester_score, ss.updated_at, ss.id, s.firstname, s.lastname')
        ->join('students s', 's.id = ss.student_id', 'inner')
        ->where('s.is_active', 1)
        ->where('ss.school_year', $schoolYear)
        ->whereIn('ss.class_section_id', $sectionIds)
        ->orderBy('ss.updated_at', 'DESC')
        ->orderBy('ss.id', 'DESC');

    if ($semesterForRank !== '') {
        $this->applySemesterFilter($builder, $semesterForRank, 'ss.semester');
    }

    $rows = $builder->get()->getResultArray();

    if (empty($rows)) {
        return null;
    }

    $scoresByStudent = [];

    foreach ($rows as $row) {
        $sid = (int)($row['student_id'] ?? 0);

        if ($sid <= 0 || isset($scoresByStudent[$sid])) {
            continue;
        }

        $scoreVal = $row['semester_score'] ?? null;

        if (!is_numeric($scoreVal)) {
            continue;
        }

        $rawScore = (float)$scoreVal;

        $scoresByStudent[$sid] = [
            'student_id' => $sid,
            'score'      => $rawScore,
            'rank_score' => round($rawScore, 1),
            'firstname'  => trim((string)($row['firstname'] ?? '')),
            'lastname'   => trim((string)($row['lastname'] ?? '')),
        ];
    }

    if (empty($scoresByStudent) || !isset($scoresByStudent[$studentId])) {
        return null;
    }

    // For Spring, rank by final year average:
    // (first semester score + second semester score) / 2.
    if ($rankByFinalScore) {
        $studentIds = array_keys($scoresByStudent);

        $firstRowsBuilder = $this->db->table('semester_scores ss')
            ->select('ss.student_id, ss.semester, ss.semester_score, ss.updated_at, ss.id')
            ->where('ss.school_year', $schoolYear)
            ->whereIn('ss.student_id', $studentIds)
            ->whereIn('ss.class_section_id', $sectionIds)
            ->orderBy('ss.updated_at', 'DESC')
            ->orderBy('ss.id', 'DESC');

        if ($semesterForRank !== '') {
            $this->applySemesterExclusion($firstRowsBuilder, $semesterForRank, 'ss.semester');
        }

        $firstRows = $firstRowsBuilder->get()->getResultArray();

        $firstScoresByStudent = [];

        foreach ($firstRows as $row) {
            $sid = (int)($row['student_id'] ?? 0);

            if ($sid <= 0 || isset($firstScoresByStudent[$sid])) {
                continue;
            }

            $scoreVal = $row['semester_score'] ?? null;

            if (!is_numeric($scoreVal)) {
                continue;
            }

            $firstScoresByStudent[$sid] = (float)$scoreVal;
        }

        foreach ($scoresByStudent as $sid => &$rankRow) {
            if (!isset($firstScoresByStudent[$sid])) {
                unset($scoresByStudent[$sid]);
                continue;
            }

            $avg = ((float)$firstScoresByStudent[$sid] + (float)$rankRow['score']) / 2;

            $rankRow['score']      = $avg;
            $rankRow['rank_score'] = round($avg, 1);
        }

        unset($rankRow);

        if (empty($scoresByStudent) || !isset($scoresByStudent[$studentId])) {
            return null;
        }

        // Force the selected student to use the exact score already computed for the report.
        // Then rank using the displayed precision: one decimal.
        $scoresByStudent[$studentId]['score']      = (float)$studentScore;
        $scoresByStudent[$studentId]['rank_score'] = round((float)$studentScore, 1);
    } else {
        // Fall: also force selected student to match the report-card computed score.
        $scoresByStudent[$studentId]['score']      = (float)$studentScore;
        $scoresByStudent[$studentId]['rank_score'] = round((float)$studentScore, 1);
    }

    $rankable = array_values($scoresByStudent);

    usort($rankable, static function (array $a, array $b): int {
        // Highest displayed/rank score first.
        $scoreCmp = $b['rank_score'] <=> $a['rank_score'];

        if ($scoreCmp !== 0) {
            return $scoreCmp;
        }

        // Tie-breakers only control display order.
        // They do NOT change rank.
        $lastCmp = strcasecmp($a['lastname'], $b['lastname']);

        if ($lastCmp !== 0) {
            return $lastCmp;
        }

        $firstCmp = strcasecmp($a['firstname'], $b['firstname']);

        if ($firstCmp !== 0) {
            return $firstCmp;
        }

        return $a['student_id'] <=> $b['student_id'];
    });

    $position      = null;
    $previousScore = null;

    foreach ($rankable as $index => $row) {
        $currentScore = (float)$row['rank_score'];

        // Competition ranking:
        // 1, 1, 3, 4...
        // Same score = same rank.
        if ($previousScore === null || abs($currentScore - $previousScore) > 0.0001) {
            $position = $index + 1;
            $previousScore = $currentScore;
        }

        if ((int)$row['student_id'] === $studentId) {
            $total = count($rankable);

            return [
                'position' => $position,
                'total'    => $total,
                'score'    => $currentScore,
                'display'  => $this->formatOrdinal($position) . ' out of ' . $total,
            ];
        }
    }

    return null;
}

    private function formatOrdinal(?int $value): string
    {
        $n = (int)$value;
        if ($n <= 0) {
            return '';
        }

        $mod100 = $n % 100;
        if ($mod100 >= 11 && $mod100 <= 13) {
            return $n . 'th';
        }

        return match ($n % 10) {
            1 => $n . 'st',
            2 => $n . 'nd',
            3 => $n . 'rd',
            default => $n . 'th',
        };
    }

    /**
     * Resolve teacher & TA names for a class section (by PK or code),
     * relaxing semester/year if needed. Returns ['teacher_name' => string, 'ta_names' => string[]].
     */
    private function resolveTeacherAndTAs(int $sectionIdOrCode, ?string $schoolYear = null, ?string $semester = null): array
    {
        $teacherName = 'N/A';
        $teacherNames = [];
        $taNames = [];

        $withPrefix = static function (array $row): string {
            $first = trim((string)($row['firstname'] ?? ''));
            $last  = trim((string)($row['lastname']  ?? ''));
            $gender = strtolower(trim((string)($row['gender'] ?? '')));
            $name = trim($first . ' ' . $last);
            if ($name === '') return '';
            $prefix = ($gender === 'female') ? 'Sr ' : (($gender === 'male') ? 'Br ' : '');
            return trim($prefix . $name);
        };

        $normalizePos = static function (?string $pos): string {
            $p = strtolower(trim((string)$pos));
            if ($p === 'teacher' || str_contains($p, 'main') || str_contains($p, 'co-teach')) return 'main';
            if ($p === 'ta' || str_contains($p, 'assist')) return 'ta';
            return 'other';
        };

        $consume = static function (array $rows) use (&$teacherName, &$teacherNames, &$taNames, $normalizePos, $withPrefix) {
            $any = false;
            $first = null;
            foreach ($rows as $r) {
                $full = $withPrefix($r);
                if ($full === '') continue;
                if ($first === null) $first = $full;
                $any = true;

                $cls = $normalizePos($r['position'] ?? null);
                if ($cls === 'main') {
                    if ($teacherName === 'N/A') {
                        $teacherName = $full;
                    }
                    $teacherNames[] = $full;
                } elseif ($cls === 'ta') {
                    $taNames[] = $full;
                }
            }
            if ($teacherName === 'N/A' && $any && $first) {
                $teacherName = $first;
                $teacherNames[] = $first;
            }
        };

        // 1) Try your model if available
        if (method_exists($this->teacherClassModel, 'getTeacherTABySection')) {
            $rows = $this->teacherClassModel->getTeacherTABySection($sectionIdOrCode, (string)$semester, (string)$schoolYear) ?? [];
            if (!empty($rows)) {
                if (isset($rows['teacher_names']) || isset($rows['teacher_name']) || isset($rows['tas'])) {
                    $aggTeacherNames = $rows['teacher_names'] ?? [];
                    if (empty($aggTeacherNames) && !empty($rows['teacher_name'])) {
                        $aggTeacherNames = [$rows['teacher_name']];
                    }
                    foreach ($aggTeacherNames as $nm) {
                        $nm = trim((string)$nm);
                        if ($nm !== '') {
                            if ($teacherName === 'N/A') $teacherName = $nm;
                            $teacherNames[] = $nm;
                        }
                    }
                    foreach (($rows['tas'] ?? []) as $taRow) {
                        if (is_array($taRow) && isset($taRow['name'])) {
                            $taNm = trim((string)$taRow['name']);
                            if ($taNm !== '') $taNames[] = $taNm;
                        } elseif (is_string($taRow)) {
                            $taNm = trim($taRow);
                            if ($taNm !== '') $taNames[] = $taNm;
                        }
                    }
                } else {
                    $consume($rows);
                }
            }
        }

        // If still unknown, do robust DB queries that cover PK/code variants and relaxed filters
        if ($teacherName === 'N/A') {
            $ids = [$sectionIdOrCode];

            $runner = function (array $ids, string $yr, string $sm) {
                $qb = $this->db->table('teacher_class tc')
                    ->select('tc.teacher_id, tc.position, u.firstname, u.lastname, u.gender')
                    ->join('users u', 'u.id = tc.teacher_id', 'inner')
                    ->whereIn('tc.class_section_id', array_map('intval', $ids))
                    ->orderBy("CASE WHEN LOWER(tc.position) IN ('main','teacher','main teacher') THEN 0 ELSE 1 END", 'ASC', false)
                    ->orderBy('COALESCE(tc.updated_at, tc.id)', 'DESC', false);
                if ($yr !== '') $qb->where('tc.school_year', $yr);
                return $qb->get()->getResultArray();
            };

            $yr = (string)($schoolYear ?? '');
            $sm = (string)($semester ?? '');

            $rows = $runner($ids, $yr, $sm);
            if (empty($rows)) $rows = $runner($ids, $yr, '');
            if (empty($rows)) $rows = $runner($ids, '',   '');
            if (!empty($rows)) $consume($rows);
        }

        // 3) Final bridge via name-join if PK/code are mixed in tc
        if ($teacherName === 'N/A') {
            // Resolve section name from either PK or code
            $csName = null;
            $byId = $this->db->table('classSection')->select('class_section_name')->where('id', $sectionIdOrCode)->get()->getRowArray();
            if (!empty($byId['class_section_name'])) {
                $csName = $byId['class_section_name'];
            } else {
                $byCode = $this->db->table('classSection')->select('class_section_name')->where('class_section_id', $sectionIdOrCode)->get()->getRowArray();
                if (!empty($byCode['class_section_name'])) $csName = $byCode['class_section_name'];
            }

            if ($csName) {
                $base = $this->db->table('teacher_class tc')
                    ->select('tc.teacher_id, tc.position, u.firstname, u.lastname, u.gender')
                    ->join('users u', 'u.id = tc.teacher_id', 'inner')
                    // unescaped join to allow OR; CI4: escape=false is the 4th arg
                    ->join('classSection cs', 'cs.id = tc.class_section_id OR cs.class_section_id = tc.class_section_id', 'inner', false)
                    ->where('cs.class_section_name', $csName)
                    ->orderBy("CASE WHEN LOWER(tc.position) IN ('main','teacher','main teacher') THEN 0 ELSE 1 END", 'ASC', false)
                    ->orderBy('COALESCE(tc.updated_at, tc.id)', 'DESC', false);

                $yr = (string)($schoolYear ?? '');
                $sm = (string)($semester   ?? '');

                $qb1 = clone $base;
                if ($yr !== '') $qb1->where('tc.school_year', $yr);
                $rows = $qb1->get()->getResultArray();

                if (empty($rows) && $yr !== '') {
                    $qb2 = clone $base;
                    $qb2->where('tc.school_year', $yr);
                    $rows = $qb2->get()->getResultArray();
                }
                if (empty($rows)) $rows = $base->get()->getResultArray();

                if (!empty($rows)) $consume($rows);
            }
        }

        // Clean names
        $taNames = array_values(array_unique(array_filter(array_map('trim', $taNames))));
        $teacherNames = array_values(array_unique(array_filter(array_map('trim', $teacherNames))));
        if (empty($teacherNames) && $teacherName !== 'N/A') {
            $teacherNames[] = $teacherName;
        }

        return [
            'teacher_name'  => $teacherName,
            'teacher_names' => $teacherNames,
            'ta_names'      => $taNames,
        ];
    }

    /**
     * Normalize a report date (YYYY-MM-DD) from input; falls back to today.
     * Returns ['iso' => 'Y-m-d', 'display' => 'F j, Y'].
     */
    private function sanitizeReportDate($input): array
    {
        $raw = trim((string)$input);
        $ts = null;
        if ($raw !== '') {
            $ts = strtotime($raw);
        }
        if ($ts === false || $ts === null) {
            $ts = time();
        }
        $iso = date('Y-m-d', $ts);
        $display = date('F j, Y', $ts);
        return ['iso' => $iso, 'display' => $display];
    }

}