<?php

namespace App\Controllers;

use App\Core\Database;
use App\Core\Request;
use App\Core\Response;
use App\Services\VideoService;

class DirectorateSupervisorController
{
    public function getDirectorateDashboard(Request $request, Response $response): void
    {
        $directorateId = $this->resolveDirectorateId($request);
        if (!$directorateId) {
            $response->status(403)->json(['status' => 'error', 'message' => 'لا توجد مديرية ضمن نطاق صلاحيات الحساب']);
            return;
        }

        $directorate = Database::selectOne(
            "SELECT d.id, d.code, d.name, d.type, d.commander_name, d.annual_contract_value,
                    (SELECT COUNT(*) FROM schools s WHERE s.directorate_id = d.id AND s.is_active = 1) AS total_schools,
                    (SELECT COUNT(*) FROM students st JOIN schools s ON s.id = st.school_id WHERE s.directorate_id = d.id) AS total_students,
                    (SELECT COUNT(*) FROM teachers t JOIN schools s ON s.id = t.school_id WHERE s.directorate_id = d.id) AS total_teachers,
                    (SELECT COUNT(*) FROM field_recorded_lessons f JOIN schools s ON s.id = f.school_id
                      WHERE s.directorate_id = d.id AND f.recorded_at >= DATE_FORMAT(NOW(), '%Y-%m-01')) AS recorded_lessons_month,
                    COALESCE((SELECT AVG(f.ai_alignment_score) FROM field_recorded_lessons f JOIN schools s ON s.id = f.school_id
                      WHERE s.directorate_id = d.id AND f.ai_alignment_score IS NOT NULL), 0) AS ai_average_score,
                    (SELECT COUNT(*) FROM unified_exams ue WHERE ue.directorate_id = d.id AND ue.status IN ('scheduled','in_progress')) AS active_unified_exams
             FROM directorates d WHERE d.id = ? AND d.is_active = 1 LIMIT 1",
            [$directorateId]
        );
        if (!$directorate) {
            $response->status(404)->json(['status' => 'error', 'message' => 'المديرية غير موجودة']);
            return;
        }

        $schools = Database::select(
            "SELECT s.id, s.code, s.name, s.governorate, s.weight_tier, s.annual_fee,
                    (SELECT COUNT(*) FROM students st WHERE st.school_id = s.id) AS student_count,
                    (SELECT COUNT(*) FROM teachers t WHERE t.school_id = s.id) AS teacher_count,
                    (SELECT COUNT(DISTINCT f.teacher_id) FROM field_recorded_lessons f
                      WHERE f.school_id = s.id AND f.recorded_at >= DATE_SUB(NOW(), INTERVAL 14 DAY)) AS teachers_recorded
             FROM schools s WHERE s.directorate_id = ? AND s.is_active = 1 ORDER BY s.name",
            [$directorateId]
        );
        $totalCompliance = 0.0;
        foreach ($schools as &$school) {
            $teacherCount = (int)$school['teacher_count'];
            $compliance = $teacherCount > 0 ? min(100, ((int)$school['teachers_recorded'] / $teacherCount) * 100) : 0.0;
            $school['compliance'] = round($compliance, 2);
            $school['status'] = $compliance >= 95 ? 'excellent' : ($compliance >= 80 ? 'good' : 'warning_under_quota');
            unset($school['teachers_recorded']);
            $totalCompliance += $compliance;
        }
        unset($school);
        $directorate['compliance_rate'] = count($schools) > 0 ? round($totalCompliance / count($schools), 2) : 0.0;

        $anomalies = Database::select(
            "SELECT ess.id, 'exam_integrity' AS type, s.name AS school_name, ue.subject,
                    CONCAT('شذوذ سرعة: ', ess.speed_anomalies_count, '، تجمع أخطاء: ', ess.error_clustering_count) AS description,
                    'high' AS severity, ess.created_at AS timestamp
             FROM exam_school_sessions ess
             JOIN schools s ON s.id = ess.school_id
             JOIN unified_exams ue ON ue.id = ess.unified_exam_id
             WHERE s.directorate_id = ? AND ess.status = 'flagged_investigation'
             ORDER BY ess.id DESC LIMIT 50",
            [$directorateId]
        );

        $response->json([
            'status' => 'success',
            'directorate' => $directorate,
            'schools' => $schools,
            'anomalies' => $anomalies,
            'radar' => ['top_teachers' => [], 'needing_support' => []],
        ]);
    }

    public function getSchoolDashboard(Request $request, Response $response): void
    {
        $requestedId = (int)$request->getQuery('school_id', 0);
        $schoolId = $this->resolveSchoolId($request, $requestedId);
        if (!$schoolId) {
            $response->status(403)->json(['status' => 'error', 'message' => 'المدرسة خارج نطاق صلاحيات الحساب']);
            return;
        }
        $school = Database::selectOne(
            "SELECT s.id, s.name, s.governorate, s.weight_tier, s.director_name,
                    (SELECT COUNT(*) FROM students st WHERE st.school_id = s.id) AS student_count,
                    (SELECT COUNT(*) FROM teachers t WHERE t.school_id = s.id) AS teacher_count
             FROM schools s WHERE s.id = ? AND s.is_active = 1 LIMIT 1",
            [$schoolId]
        );
        if (!$school) {
            $response->status(404)->json(['status' => 'error', 'message' => 'المدرسة غير موجودة']);
            return;
        }
        $teachers = Database::select(
            "SELECT t.id, t.full_name AS name, t.specialization AS subject,
                    COALESCE(f.grade_level, '') AS grade,
                    CASE WHEN f.recorded_at >= DATE_SUB(NOW(), INTERVAL 14 DAY) THEN 'completed' ELSE 'pending' END AS quota_status,
                    COALESCE(f.lesson_title, '') AS last_lesson,
                    COALESCE(f.ai_alignment_score, 0) AS ai_score,
                    COALESCE(DATE_FORMAT(f.recorded_at, '%Y-%m-%d %H:%i'), '') AS recorded_at
             FROM teachers t
             LEFT JOIN field_recorded_lessons f ON f.id = (
               SELECT f2.id FROM field_recorded_lessons f2 WHERE f2.teacher_id = t.id ORDER BY f2.recorded_at DESC LIMIT 1
             )
             WHERE t.school_id = ? ORDER BY t.full_name",
            [$schoolId]
        );
        $activeExams = Database::select(
            "SELECT ue.id, ess.id AS session_id, ue.title, ue.subject, ue.grade_level, ue.scheduled_at AS scheduled_time,
                    ue.duration_minutes, ess.pushed_to_lab, ess.status
             FROM exam_school_sessions ess JOIN unified_exams ue ON ue.id = ess.unified_exam_id
             WHERE ess.school_id = ? AND ue.status IN ('scheduled','in_progress') ORDER BY ue.scheduled_at",
            [$schoolId]
        );
        $recorded = count(array_filter($teachers, fn($t) => $t['quota_status'] === 'completed'));
        $school['biweekly_cycle'] = date('Y-m-d', strtotime('-14 days')) . ' — ' . date('Y-m-d');
        $school['cycle_progress'] = $recorded . ' من ' . count($teachers) . ' معلم';

        $response->json(['status' => 'success', 'school' => $school, 'teachers' => $teachers, 'active_exams' => $activeExams, 'computer_labs' => []]);
    }

    public function recordLesson(Request $request, Response $response): void
    {
        $body = $request->getBody();
        $schoolId = $this->resolveSchoolId($request, (int)($body['school_id'] ?? 0));
        $teacherId = (int)($body['teacher_id'] ?? 0);
        $subject = trim((string)($body['subject'] ?? ''));
        $grade = trim((string)($body['grade_level'] ?? ''));
        $title = trim((string)($body['lesson_title'] ?? ''));
        if (!$schoolId || !$teacherId || $subject === '' || $grade === '' || $title === '' || empty($_FILES['video'])) {
            $response->status(422)->json(['status' => 'error', 'message' => 'المدرسة والمعلم والمبحث والصف والعنوان وملف الفيديو مطلوبة']);
            return;
        }
        $teacher = Database::selectOne("SELECT id, full_name FROM teachers WHERE id = ? AND school_id = ? LIMIT 1", [$teacherId, $schoolId]);
        if (!$teacher) {
            $response->status(404)->json(['status' => 'error', 'message' => 'المعلم غير مرتبط بهذه المدرسة']);
            return;
        }
        $file = $_FILES['video'];
        if (($file['error'] ?? UPLOAD_ERR_NO_FILE) !== UPLOAD_ERR_OK || (int)$file['size'] > 400 * 1024 * 1024) {
            $response->status(422)->json(['status' => 'error', 'message' => 'ملف الفيديو غير صالح أو يتجاوز 400 ميجابايت']);
            return;
        }
        $uuid = $this->uuid();
        $extension = strtolower(pathinfo((string)$file['name'], PATHINFO_EXTENSION));
        if (!in_array($extension, ['mp4', 'mov', 'webm'], true)) {
            $response->status(422)->json(['status' => 'error', 'message' => 'صيغة الفيديو غير مدعومة']);
            return;
        }
        $videoUrl = VideoService::uploadToR2((string)$file['tmp_name'], "field-lessons/{$schoolId}/{$uuid}.{$extension}", (string)($file['type'] ?? 'video/mp4'));
        if (!$videoUrl) {
            $response->status(502)->json(['status' => 'error', 'message' => 'تعذر رفع الفيديو إلى Cloudflare R2']);
            return;
        }
        Database::insert(
            "INSERT INTO field_recorded_lessons
             (uuid, school_id, teacher_id, subject, grade_level, lesson_title, video_path, file_size_mb, duration_minutes, status, recorded_by_name, recorded_by_role)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, 'pending_ai', ?, ?)",
            [$uuid, $schoolId, $teacherId, $subject, $grade, $title, $videoUrl, round((int)$file['size'] / 1048576, 2), (int)($body['duration_minutes'] ?? 0), (string)($request->full_name ?? $request->uuid ?? 'staff'), $request->role === 'school_admin' ? 'principal' : 'supervisor']
        );
        $response->status(201)->json(['status' => 'success', 'message' => 'تم رفع الحصة وبانتظار التحليل الفعلي', 'data' => ['lesson_uuid' => $uuid, 'teacher_name' => $teacher['full_name'], 'subject' => $subject, 'lesson_title' => $title, 'file_size_mb' => round((int)$file['size'] / 1048576, 2), 'duration_minutes' => (int)($body['duration_minutes'] ?? 0), 'ai_alignment_score' => 0, 'teacher_talk_ratio' => '', 'status' => 'pending_ai', 'socratic_checkpoints' => [], 'report_summary' => 'بانتظار التحليل']]);
    }

    public function pushExamToLab(Request $request, Response $response): void
    {
        $body = $request->getBody();
        $examId = (int)($body['exam_id'] ?? 0);
        $schoolId = $this->resolveSchoolId($request, (int)($body['school_id'] ?? 0));
        if (!$examId || !$schoolId) {
            $response->status(422)->json(['status' => 'error', 'message' => 'معرف الامتحان والمدرسة مطلوبان']);
            return;
        }
        $exam = Database::selectOne("SELECT id FROM unified_exams WHERE id = ? LIMIT 1", [$examId]);
        if (!$exam) {
            $response->status(404)->json(['status' => 'error', 'message' => 'الامتحان غير موجود']);
            return;
        }
        Database::query("INSERT INTO exam_school_sessions (unified_exam_id, school_id, pushed_to_lab, pushed_to_lab_at) VALUES (?, ?, 1, NOW()) ON DUPLICATE KEY UPDATE pushed_to_lab = 1, pushed_to_lab_at = NOW()", [$examId, $schoolId]);
        $response->json(['status' => 'success', 'message' => 'تم تفعيل الامتحان للمختبر المسجل', 'exam_id' => $examId, 'school_id' => $schoolId, 'pushed_at' => date('Y-m-d H:i:s')]);
    }

    public function uploadPanoramicSample(Request $request, Response $response): void
    {
        $body = $request->getBody();
        $sessionId = (int)($body['session_id'] ?? 0);
        $session = Database::selectOne("SELECT ess.id, ess.school_id FROM exam_school_sessions ess WHERE ess.id = ? LIMIT 1", [$sessionId]);
        if (!$session || !$this->resolveSchoolId($request, (int)$session['school_id']) || empty($_FILES['video'])) {
            $response->status(422)->json(['status' => 'error', 'message' => 'جلسة صحيحة وملف فيديو بانورامي مطلوبان']);
            return;
        }
        $file = $_FILES['video'];
        $url = VideoService::uploadToR2((string)$file['tmp_name'], "exam-samples/{$sessionId}/{$this->uuid()}.mp4", (string)($file['type'] ?? 'video/mp4'));
        if (!$url) {
            $response->status(502)->json(['status' => 'error', 'message' => 'تعذر رفع العينة إلى R2']);
            return;
        }
        $size = round((int)$file['size'] / 1048576, 2);
        Database::query("UPDATE exam_school_sessions SET panoramic_video_path = ?, panoramic_size_mb = ? WHERE id = ?", [$url, $size, $sessionId]);
        $response->json(['status' => 'success', 'message' => 'تم حفظ العينة وربطها بالجلسة', 'file_size_mb' => $size]);
    }

    public function generateDualForms(Request $request, Response $response): void
    {
        $forms = \App\Services\UnifiedExamService::generateDualForms((string)$request->getQuery('subject', ''), (string)$request->getQuery('grade_level', ''));
        $response->json(['status' => 'success', 'data' => $forms]);
    }

    public function evaluateExamSessionIntegrity(Request $request, Response $response): void
    {
        $submissions = $request->getBody()['submissions'] ?? [];
        if (!is_array($submissions) || !$submissions) {
            $response->status(422)->json(['status' => 'error', 'message' => 'لا يمكن تقييم النزاهة دون تسليمات امتحان حقيقية']);
            return;
        }
        $response->json(['status' => 'success', 'data' => \App\Services\UnifiedExamService::evaluateExamSessionIntegrity($submissions)]);
    }

    public function dispatchParentReports(Request $request, Response $response): void
    {
        $body = $request->getBody();
        $schoolId = $this->resolveSchoolId($request, (int)($body['school_id'] ?? 0));
        if (!$schoolId) {
            $response->status(403)->json(['status' => 'error', 'message' => 'المدرسة خارج نطاق الصلاحية']);
            return;
        }
        $studentId = (int)($body['student_id'] ?? 0);
        if ($studentId) {
            $student = Database::selectOne("SELECT id FROM students WHERE id = ? AND school_id = ? LIMIT 1", [$studentId, $schoolId]);
            if (!$student) {
                $response->status(404)->json(['status' => 'error', 'message' => 'الطالب غير موجود في المدرسة']);
                return;
            }
        }
        $result = $studentId ? \App\Services\ParentReportService::dispatchReportToGuardian($studentId) : \App\Services\ParentReportService::dispatchBatchReports($schoolId);
        $response->json($result);
    }

    public function importSchoolRoster(Request $request, Response $response): void
    {
        $body = $request->getBody();
        $schoolId = $this->resolveSchoolId($request, (int)($body['school_id'] ?? 0));
        $records = $body['records'] ?? [];
        if (!$schoolId || !is_array($records) || !$records) {
            $response->status(422)->json(['status' => 'error', 'message' => 'المدرسة وكشف حقيقي غير فارغ مطلوبان']);
            return;
        }
        $response->json(\App\Services\SchoolRosterService::importStudentRoster($schoolId, $records));
    }

    private function resolveDirectorateId(Request $request): int
    {
        if ($request->role === 'super_admin') {
            $requested = (int)$request->getQuery('directorate_id', 0);
            if ($requested) return $requested;
        }
        if ($request->directorate_id) return (int)$request->directorate_id;
        if ($request->school_id) {
            $row = Database::selectOne("SELECT directorate_id FROM schools WHERE id = ? LIMIT 1", [$request->school_id]);
            return (int)($row['directorate_id'] ?? 0);
        }
        return 0;
    }

    private function resolveSchoolId(Request $request, int $requested): int
    {
        if (in_array($request->role, ['school_admin', 'supervisor'], true)) {
            return $request->school_id && (!$requested || $requested === $request->school_id) ? (int)$request->school_id : 0;
        }
        if ($request->role === 'directorate_admin') {
            if (!$requested || !$request->directorate_id) return 0;
            $row = Database::selectOne("SELECT id FROM schools WHERE id = ? AND directorate_id = ? LIMIT 1", [$requested, $request->directorate_id]);
            return $row ? $requested : 0;
        }
        return $request->role === 'super_admin' ? $requested : 0;
    }

    private function uuid(): string
    {
        $data = random_bytes(16);
        $data[6] = chr((ord($data[6]) & 0x0f) | 0x40);
        $data[8] = chr((ord($data[8]) & 0x3f) | 0x80);
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }
}