<?php

namespace App\Services;

use App\Support\Enrollment\DeliberationDecision;
use App\Support\Enrollment\EnrollmentEligibility;
use CodeIgniter\Database\BaseConnection;
use DateTimeImmutable;
use DateTimeInterface;
use RuntimeException;

final class EnrollmentTransitionService
{
    public function __construct(private readonly BaseConnection $db)
    {
    }

    public function evaluate(
        int $studentId,
        string $sourceSchoolYear,
        string $targetSchoolYear,
        string $actorRole = 'parent',
        ?DateTimeInterface $now = null
    ): array {
        $now = $now !== null ? DateTimeImmutable::createFromInterface($now) : new DateTimeImmutable('now');
        $targetYear = $this->schoolYearByName($targetSchoolYear);
        $sourceAssignment = $this->sourceAssignment($studentId, $sourceSchoolYear);
        $student = $this->student($studentId);
        $decisionRow = $this->decisionRow($studentId, $sourceSchoolYear);
        $decision = DeliberationDecision::normalize($decisionRow['deliberation_decision_standard'] ?? null)
            ?? DeliberationDecision::normalize($decisionRow['decision'] ?? null);

        $result = [
            'student_id' => $studentId,
            'source_school_year' => $sourceSchoolYear,
            'target_school_year' => $targetSchoolYear,
            'deliberation_decision' => $decision,
            'decision_label' => DeliberationDecision::display($decisionRow['decision'] ?? ''),
            'source_grade_id' => $sourceAssignment['class_id'] ?? null,
            'source_grade_name' => $sourceAssignment['class_name'] ?? null,
            'source_class_section_id' => $sourceAssignment['class_section_id'] ?? null,
            'source_class_section_name' => $sourceAssignment['class_section_name'] ?? null,
            'assigned_grade_id' => null,
            'assigned_class_section_id' => null,
            'placement_status' => 'not_created',
            'academic_eligible' => false,
            'parent_enrollment_allowed' => false,
            'student_self_enrollment_allowed' => false,
            'administrative_enrollment_allowed' => true,
            'age_reference_date' => $this->ageReferenceDate($targetSchoolYear),
            'age_on_reference_date' => null,
            'adult_student' => false,
            'registration_window_status' => 'unknown',
            'blockers' => [],
            'warnings' => [],
            'flags' => [],
        ];

        if ($student === null) {
            $result['blockers'][] = 'Student record was not found.';
            return $result;
        }

        if ($sourceAssignment === null) {
            $result['blockers'][] = 'Student does not belong to the closing school year.';
            return $result;
        }

        if ($decisionRow === null || $decision === null) {
            $result['blockers'][] = EnrollmentEligibility::MISSING_DECISION_MESSAGE;
            $result['flags'][] = $this->flag('DEFERRED_DELIBERATION', 'high', [
                'reason' => 'Missing or unrecognized final deliberation decision.',
            ]);
            return $result;
        }

        if ($decision === DeliberationDecision::EXPELLED) {
            $result['blockers'][] = EnrollmentEligibility::EXPELLED_MESSAGE;
            $result['flags'][] = $this->flag('RESTRICTED_ADMINISTRATIVE_REVIEW', 'high');
            return $result;
        }

        if ($decision === DeliberationDecision::WITHDRAWN) {
            $result['blockers'][] = EnrollmentEligibility::WITHDRAWN_MESSAGE;
            $result['flags'][] = $this->flag('WITHDRAWAL_REVIEW_REQUIRED', 'normal');
            return $result;
        }

        if ($decision === DeliberationDecision::DEFERRED_DECISION) {
            $result['blockers'][] = EnrollmentEligibility::DEFERRED_MESSAGE;
            $result['flags'][] = $this->flag('DEFERRED_DELIBERATION', 'high');
            return $result;
        }

        $placement = $this->placement($decision, $sourceAssignment, $targetSchoolYear);
        $result = array_replace($result, $placement);
        $result['academic_eligible'] = $placement['placement_status'] !== 'exit_required';

        if ($placement['placement_status'] === 'exit_required') {
            $result['blockers'][] = 'The student has passed the highest available grade and must follow the school completion or exit process.';
            $result['flags'][] = $this->flag('COMPLETION_OR_EXIT_PROCESS_REQUIRED', 'normal', [
                'source_class' => $sourceAssignment['class_section_name'] ?? null,
            ]);
        }

        $age = EnrollmentEligibility::ageOnSeptemberFirst($student['dob'] ?? null, $targetSchoolYear);
        $result['age_on_reference_date'] = $age;
        $result['adult_student'] = $age !== null && $age >= 18;
        $result['parent_enrollment_allowed'] = $result['academic_eligible'];
        $result['student_self_enrollment_allowed'] = $result['academic_eligible'] && (bool) ($targetYear['adult_student_registration_enabled'] ?? false);

        if ($result['adult_student']) {
            $result['parent_enrollment_allowed'] = false;
            $result['flags'][] = $this->flag('ADULT_STUDENT_ACTION_REQUIRED', 'normal', [
                'age_on_reference_date' => $age,
            ]);
            if ($actorRole === 'parent') {
                $result['blockers'][] = str_replace('The student', $this->studentName($student), EnrollmentEligibility::ADULT_STUDENT_MESSAGE);
            }
        }

        $this->applyRegistrationWindow($result, $targetYear, $now, $actorRole);
        $this->applyAgeRules($result, $targetSchoolYear, $age);

        if ($result['blockers'] === [] && $result['academic_eligible']) {
            if ($actorRole === 'parent') {
                $result['parent_enrollment_allowed'] = $result['parent_enrollment_allowed'] && ! $result['adult_student'];
            }
        } elseif ($actorRole === 'parent') {
            $result['parent_enrollment_allowed'] = false;
        } elseif ($actorRole === 'student') {
            $result['student_self_enrollment_allowed'] = false;
        }

        return $result;
    }

    public function applyInitialTransition(
        int $studentId,
        string $sourceSchoolYear,
        string $targetSchoolYear,
        ?int $parentId,
        ?int $performedBy = null,
        string $actorRole = 'admin'
    ): array {
        $evaluation = $this->evaluate($studentId, $sourceSchoolYear, $targetSchoolYear, $actorRole);
        if (! $evaluation['academic_eligible'] || $evaluation['blockers'] !== []) {
            $this->writeFlags($evaluation, $performedBy);
            $this->audit($evaluation, 'transition_evaluation_blocked', $performedBy, null, $evaluation);
            return $evaluation;
        }

        $this->db->transStart();
        $original = $this->latestEnrollment($studentId, $targetSchoolYear);
        $student = $this->student($studentId);
        $parentId = $parentId ?? (is_numeric($student['parent_id'] ?? null) ? (int) $student['parent_id'] : null);

        $payload = [
            'student_id' => $studentId,
            'parent_id' => $parentId,
            'school_year' => $targetSchoolYear,
            'source_school_year' => $sourceSchoolYear,
            'deliberation_decision' => $evaluation['deliberation_decision'],
            'source_grade_id' => $evaluation['source_grade_id'],
            'assigned_grade_id' => $evaluation['assigned_grade_id'],
            'source_class_section_id' => $evaluation['source_class_section_id'],
            'assigned_class_section_id' => $evaluation['assigned_class_section_id'],
            'class_section_id' => $evaluation['assigned_class_section_id'],
            'placement_status' => $evaluation['placement_status'],
            'age_reference_date' => $evaluation['age_reference_date'],
            'age_on_reference_date' => $evaluation['age_on_reference_date'],
            'adult_student' => $evaluation['adult_student'] ? 1 : 0,
            'parent_enrollment_allowed' => $evaluation['parent_enrollment_allowed'] ? 1 : 0,
            'student_self_enrollment_allowed' => $evaluation['student_self_enrollment_allowed'] ? 1 : 0,
            'exception_required' => $evaluation['flags'] !== [] ? 1 : 0,
            'exception_reason' => $evaluation['flags'] !== [] ? implode(', ', array_column($evaluation['flags'], 'flag_type')) : null,
            'enrollment_date' => date('Y-m-d'),
            'enrollment_status' => 'admission under review',
            'admission_status' => 'pending',
            'updated_at' => date('Y-m-d H:i:s'),
        ];

        if ($original !== null) {
            $this->db->table('enrollments')->where('id', (int) $original['id'])->update($payload);
        } else {
            $payload['created_at'] = date('Y-m-d H:i:s');
            $this->db->table('enrollments')->insert($payload);
        }

        if ((int) ($evaluation['assigned_class_section_id'] ?? 0) > 0) {
            $this->upsertStudentClass($studentId, (int) $evaluation['assigned_class_section_id'], $targetSchoolYear, $performedBy);
        }

        $this->writeFlags($evaluation, $performedBy);
        $this->audit($evaluation, 'initial_transition_applied', $performedBy, $original, $payload);
        $this->db->transComplete();

        if ($this->db->transStatus() === false) {
            throw new RuntimeException('Unable to apply enrollment transition.');
        }

        return $evaluation;
    }

    private function placement(string $decision, array $sourceAssignment, string $targetSchoolYear): array
    {
        $sourceClassId = (int) ($sourceAssignment['class_id'] ?? 0);
        $sourceClassName = trim((string) ($sourceAssignment['class_name'] ?? $sourceAssignment['class_section_name'] ?? ''));
        $sourceSectionName = trim((string) ($sourceAssignment['class_section_name'] ?? ''));

        if ($decision === DeliberationDecision::PASSED) {
            $targetClass = $this->nextClass($sourceClassName, $targetSchoolYear);
            return [
                'assigned_grade_id' => $targetClass['id'] ?? null,
                'assigned_grade_name' => $targetClass['class_name'] ?? null,
                'assigned_class_section_id' => null,
                'placement_status' => $targetClass === null ? 'exit_required' : 'automatic_distribution_pending',
                'flags' => [],
            ];
        }

        if ($decision === DeliberationDecision::REPEAT_CLASS) {
            $targetSection = $this->matchingSection($sourceSectionName, $sourceClassId, $targetSchoolYear);
            $flags = [];
            if ($targetSection === null) {
                $flags[] = $this->flag('CLASS_REASSIGNMENT_REQUIRED', 'normal', [
                    'previous_class_section_name' => $sourceSectionName,
                ]);
            } elseif ($this->sectionAtCapacity((int) $targetSection['class_section_id'])) {
                $flags[] = $this->flag('CLASS_CAPACITY_EXCEPTION_REQUIRED', 'normal', [
                    'class_section_id' => (int) $targetSection['class_section_id'],
                ]);
            }

            return [
                'assigned_grade_id' => $targetSection['class_id'] ?? $this->sameClassInTargetYear($sourceClassName, $targetSchoolYear)['id'] ?? ($sourceClassId ?: null),
                'assigned_grade_name' => $this->classNameForId((int) ($targetSection['class_id'] ?? 0)) ?? $sourceClassName,
                'assigned_class_section_id' => $targetSection['class_section_id'] ?? null,
                'placement_status' => $targetSection === null ? 'manual_class_required' : 'same_class_assigned',
                'flags' => $flags,
            ];
        }

        if ($decision === DeliberationDecision::MAKE_UP_EXAM) {
            $targetSection = $this->matchingSection($sourceSectionName, $sourceClassId, $targetSchoolYear);
            return [
                'assigned_grade_id' => $targetSection['class_id'] ?? $this->sameClassInTargetYear($sourceClassName, $targetSchoolYear)['id'] ?? ($sourceClassId ?: null),
                'assigned_grade_name' => $this->classNameForId((int) ($targetSection['class_id'] ?? 0)) ?? $sourceClassName,
                'assigned_class_section_id' => $targetSection['class_section_id'] ?? null,
                'placement_status' => $targetSection === null ? 'temporary_manual_class_required' : 'temporary_same_grade',
                'flags' => [
                    $this->flag('PENDING_MAKE_UP_EXAM_PROMOTION', 'high', [
                        'current_grade_id' => $sourceClassId ?: null,
                        'expected_promoted_grade_id' => $this->nextClass($sourceClassName, $targetSchoolYear)['id'] ?? null,
                        'current_class_section_id' => $targetSection['class_section_id'] ?? null,
                    ]),
                ],
            ];
        }

        return ['assigned_grade_id' => null, 'assigned_class_section_id' => null, 'placement_status' => 'not_created', 'flags' => []];
    }

    private function applyRegistrationWindow(array &$result, ?array $targetYear, DateTimeImmutable $now, string $actorRole): void
    {
        if ($targetYear === null) {
            $result['registration_window_status'] = 'missing_school_year';
            $result['blockers'][] = 'Target school year configuration was not found.';
            return;
        }

        $opensAt = $this->dateTimeFromYear($targetYear, 'registration_opens_at', 'registration_starts_on', false);
        $deadlineAt = $this->dateTimeFromYear($targetYear, 'registration_deadline_at', 'registration_ends_on', true);

        if ($opensAt !== null && $now < $opensAt) {
            $result['registration_window_status'] = 'not_open';
            $result['blockers'][] = 'Registration for the new school year has not opened yet. Registration will be available starting on ' . $opensAt->format('F j, Y g:i A') . '.';
            return;
        }

        if ($deadlineAt !== null && $now > $deadlineAt && (int) ($targetYear['late_registration_blocked'] ?? 1) === 1 && $actorRole !== 'admin') {
            $result['registration_window_status'] = 'closed';
            $result['blockers'][] = 'The registration deadline was ' . $deadlineAt->format('F j, Y g:i A') . '. Online registration is no longer available. Please contact the school administration if you believe an exception applies.';
            $result['flags'][] = $this->flag('LATE_REGISTRATION_EXCEPTION', 'normal');
            return;
        }

        $result['registration_window_status'] = 'open';
    }

    private function applyAgeRules(array &$result, string $targetSchoolYear, ?int $age): void
    {
        if ($age === null || ! $this->db->tableExists('enrollment_age_rules')) {
            return;
        }

        $builder = $this->db->table('enrollment_age_rules')
            ->where('school_year', $targetSchoolYear)
            ->groupStart()
                ->where('grade_class_id', null)
                ->orWhere('grade_class_id', $result['assigned_grade_id'])
            ->groupEnd();

        foreach ($builder->get()->getResultArray() as $rule) {
            $min = is_numeric($rule['minimum_age'] ?? null) ? (int) $rule['minimum_age'] : null;
            $max = is_numeric($rule['maximum_age'] ?? null) ? (int) $rule['maximum_age'] : null;
            $violated = ($min !== null && $age < $min) || ($max !== null && $age > $max);
            if (! $violated) {
                continue;
            }

            $message = 'Student age does not satisfy a configured age rule for the target placement.';
            if (($rule['behavior'] ?? 'blocking') === 'warning') {
                $result['warnings'][] = $message;
            } else {
                $result['blockers'][] = $message;
                $result['flags'][] = $this->flag('AGE_EXCEPTION_REQUIRED', 'normal', [
                    'age_rule_id' => (int) $rule['id'],
                    'age_on_reference_date' => $age,
                ]);
            }
        }
    }

    private function sourceAssignment(int $studentId, string $sourceSchoolYear): ?array
    {
        if (! $this->db->tableExists('student_class')) {
            return $this->sourceEnrollmentAssignment($studentId, $sourceSchoolYear);
        }

        $assignment = $this->db->table('student_class sc')
            ->select('sc.class_section_id, cs.class_section_name, cs.class_id, c.class_name')
            ->join('classSection cs', 'cs.class_section_id = sc.class_section_id', 'left')
            ->join('classes c', 'c.id = cs.class_id', 'left')
            ->where('sc.student_id', $studentId)
            ->where('sc.school_year', $sourceSchoolYear)
            ->where('sc.class_section_id IS NOT NULL', null, false)
            ->orderBy('sc.updated_at', 'DESC')
            ->orderBy('sc.id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray();

        return $assignment ?: $this->sourceEnrollmentAssignment($studentId, $sourceSchoolYear);
    }

    private function sourceEnrollmentAssignment(int $studentId, string $sourceSchoolYear): ?array
    {
        if (! $this->db->tableExists('enrollments')) {
            return null;
        }

        return $this->db->table('enrollments e')
            ->select('e.class_section_id, cs.class_section_name, cs.class_id, c.class_name')
            ->join('classSection cs', 'cs.class_section_id = e.class_section_id', 'left')
            ->join('classes c', 'c.id = cs.class_id', 'left')
            ->where('e.student_id', $studentId)
            ->where('e.school_year', $sourceSchoolYear)
            ->where('e.class_section_id IS NOT NULL', null, false)
            ->orderBy('e.updated_at', 'DESC')
            ->orderBy('e.id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray() ?: null;
    }

    private function decisionRow(int $studentId, string $sourceSchoolYear): ?array
    {
        if (! $this->db->tableExists('student_decisions')) {
            return null;
        }

        $select = ['decision', 'source', 'notes', 'class_section_name'];
        if ($this->db->fieldExists('deliberation_decision_standard', 'student_decisions')) {
            $select[] = 'deliberation_decision_standard';
        }

        return $this->db->table('student_decisions')
            ->select($select)
            ->where('student_id', $studentId)
            ->where('school_year', $sourceSchoolYear)
            ->orderBy('updated_at', 'DESC')
            ->orderBy('id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray() ?: null;
    }

    private function student(int $studentId): ?array
    {
        return $this->db->table('students')
            ->select('id, firstname, lastname, dob, parent_id')
            ->where('id', $studentId)
            ->limit(1)
            ->get()
            ->getRowArray() ?: null;
    }

    private function schoolYearByName(string $schoolYear): ?array
    {
        if (! $this->db->tableExists('school_years')) {
            return null;
        }

        return $this->db->table('school_years')->where('name', $schoolYear)->limit(1)->get()->getRowArray() ?: null;
    }

    private function nextClass(string $sourceClassName, string $targetSchoolYear): ?array
    {
        $base = $this->classBaseName($sourceClassName);
        $target = match (true) {
            $base === 'KG' || str_contains($base, 'KINDERGARTEN') => '1',
            ctype_digit($base) => (string) ((int) $base + 1),
            $base === 'YOUTH' => 'YOUTH',
            default => '',
        };

        if ($target === '') {
            return null;
        }

        $targetClass = $this->classByName($target, $targetSchoolYear);
        if ($targetClass !== null) {
            return $targetClass;
        }

        return ctype_digit($base) && (int) $base >= 9
            ? $this->classByName('YOUTH', $targetSchoolYear)
            : null;
    }

    private function sameClassInTargetYear(string $sourceClassName, string $targetSchoolYear): ?array
    {
        $base = $this->classBaseName($sourceClassName);
        if ($base === '') {
            return null;
        }

        if (str_contains($base, 'KINDERGARTEN')) {
            $base = 'KG';
        }

        return $this->classByName($base, $targetSchoolYear);
    }

    private function classBaseName(string $className): string
    {
        $base = strtoupper(trim((string) preg_replace('/-.+$/', '', $className)));
        $base = preg_replace('/\b(CLASS|GRADE)\b/i', '', $base) ?? $base;
        $base = trim(preg_replace('/\s+/', ' ', $base) ?? $base);

        if (str_contains($base, 'KINDERGARTEN')) {
            return 'KG';
        }

        if (preg_match('/\d+/', $base, $matches) === 1) {
            return (string) (int) $matches[0];
        }

        return $base;
    }

    private function classByName(string $className, string $schoolYear): ?array
    {
        $builder = $this->db->table('classes')->where('UPPER(class_name)', strtoupper($className));
        if ($this->db->fieldExists('school_year', 'classes')) {
            $builder->where('school_year', $schoolYear);
        }

        $row = $builder->orderBy('id', 'DESC')->limit(1)->get()->getRowArray();
        if ($row !== null || ! $this->db->fieldExists('school_year', 'classes')) {
            return $row ?: null;
        }

        return $this->db->table('classes')
            ->where('UPPER(class_name)', strtoupper($className))
            ->orderBy('id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray() ?: null;
    }

    private function classNameForId(int $classId): ?string
    {
        if ($classId <= 0 || ! $this->db->tableExists('classes')) {
            return null;
        }

        $row = $this->db->table('classes')
            ->select('class_name')
            ->where('id', $classId)
            ->limit(1)
            ->get()
            ->getRowArray();

        $name = trim((string) ($row['class_name'] ?? ''));

        return $name !== '' ? $name : null;
    }

    private function matchingSection(string $sourceSectionName, int $sourceClassId, string $targetSchoolYear): ?array
    {
        $builder = $this->db->table('classSection')->select('class_section_id, class_id, class_section_name')->orderBy('id', 'DESC');
        if ($sourceSectionName !== '') {
            $builder->where('class_section_name', $sourceSectionName);
        } else {
            $builder->where('class_id', $sourceClassId)->where("class_section_name NOT LIKE '%-%'", null, false);
        }

        if ($this->db->fieldExists('school_year', 'classSection')) {
            $builder->where('school_year', $targetSchoolYear);
        }

        return $builder->limit(1)->get()->getRowArray() ?: null;
    }

    private function sectionAtCapacity(int $classSectionId): bool
    {
        $section = $this->db->table('classSection cs')
            ->select('cs.class_section_id, c.capacity')
            ->join('classes c', 'c.id = cs.class_id', 'left')
            ->where('cs.class_section_id', $classSectionId)
            ->orderBy('cs.id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray();

        $capacity = is_numeric($section['capacity'] ?? null) ? (int) $section['capacity'] : 0;
        if ($capacity <= 0) {
            return false;
        }

        $count = $this->db->table('student_class')->where('class_section_id', $classSectionId)->countAllResults();
        return $count >= $capacity;
    }

    private function latestEnrollment(int $studentId, string $schoolYear): ?array
    {
        if (! $this->db->tableExists('enrollments')) {
            return null;
        }

        return $this->db->table('enrollments')
            ->where('student_id', $studentId)
            ->where('school_year', $schoolYear)
            ->orderBy('updated_at', 'DESC')
            ->orderBy('id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray() ?: null;
    }

    private function upsertStudentClass(int $studentId, int $classSectionId, string $schoolYear, ?int $performedBy): void
    {
        $existing = $this->db->table('student_class')
            ->where('student_id', $studentId)
            ->where('school_year', $schoolYear)
            ->orderBy('id', 'DESC')
            ->limit(1)
            ->get()
            ->getRowArray();

        $payload = [
            'student_id' => $studentId,
            'class_section_id' => $classSectionId,
            'school_year' => $schoolYear,
            'updated_by' => $performedBy,
            'updated_at' => date('Y-m-d H:i:s'),
        ];

        if ($existing !== null) {
            $this->db->table('student_class')->where('id', (int) $existing['id'])->update($payload);
        } else {
            $payload['created_at'] = date('Y-m-d H:i:s');
            $this->db->table('student_class')->insert($payload);
        }
    }

    private function writeFlags(array $evaluation, ?int $performedBy): void
    {
        if (! $this->db->tableExists('enrollment_flags')) {
            return;
        }

        foreach ($evaluation['flags'] as $flag) {
            $existing = $this->db->table('enrollment_flags')
                ->where('student_id', (int) $evaluation['student_id'])
                ->where('school_year', (string) $evaluation['target_school_year'])
                ->where('flag_type', (string) $flag['flag_type'])
                ->where('status', 'open')
                ->limit(1)
                ->get()
                ->getRowArray();

            if ($existing !== null) {
                continue;
            }

            $this->db->table('enrollment_flags')->insert([
                'flag_type' => $flag['flag_type'],
                'student_id' => (int) $evaluation['student_id'],
                'school_year' => (string) $evaluation['target_school_year'],
                'source_school_year' => (string) $evaluation['source_school_year'],
                'status' => 'open',
                'priority' => $flag['priority'] ?? 'normal',
                'assigned_to' => $performedBy,
                'details_json' => json_encode($flag['details'] ?? [], JSON_UNESCAPED_SLASHES),
                'created_at' => date('Y-m-d H:i:s'),
            ]);
        }
    }

    private function audit(array $evaluation, string $action, ?int $performedBy, ?array $original, array $new): void
    {
        if (! $this->db->tableExists('enrollment_transition_audits')) {
            return;
        }

        $this->db->table('enrollment_transition_audits')->insert([
            'student_id' => (int) $evaluation['student_id'],
            'school_year' => (string) $evaluation['target_school_year'],
            'source_school_year' => (string) $evaluation['source_school_year'],
            'action' => $action,
            'performed_by' => $performedBy,
            'original_values_json' => $original !== null ? json_encode($original, JSON_UNESCAPED_SLASHES) : null,
            'new_values_json' => json_encode($new, JSON_UNESCAPED_SLASHES),
            'reason' => implode(' ', $evaluation['blockers'] ?? []),
            'created_at' => date('Y-m-d H:i:s'),
        ]);
    }

    private function flag(string $type, string $priority, array $details = []): array
    {
        return ['flag_type' => $type, 'priority' => $priority, 'details' => $details];
    }

    private function ageReferenceDate(string $schoolYear): string
    {
        return preg_match('/^(\d{4})/', $schoolYear, $matches) ? $matches[1] . '-09-01' : date('Y') . '-09-01';
    }

    private function dateTimeFromYear(array $year, string $dateTimeField, string $dateField, bool $endOfDay): ?DateTimeImmutable
    {
        $value = trim((string) ($year[$dateTimeField] ?? ''));
        if ($value === '') {
            $date = trim((string) ($year[$dateField] ?? ''));
            $value = $date !== '' ? $date . ($endOfDay ? ' 23:59:59' : ' 00:00:00') : '';
        }

        if ($value === '') {
            return null;
        }

        try {
            return new DateTimeImmutable($value);
        } catch (\Throwable) {
            return null;
        }
    }

    private function studentName(array $student): string
    {
        $name = trim((string) ($student['firstname'] ?? '') . ' ' . (string) ($student['lastname'] ?? ''));
        return $name !== '' ? $name : 'The student';
    }
}