<?php

// Use the same environment loader and PSR-4 bootstrap as the web API.
// Running this script directly must still load backend/.env.
require_once __DIR__ . '/../app/bootstrap.php';

use App\Core\Database;
use App\Services\CurriculumService;

echo "=== SAQEL ENTERPRISE CURRICULUM DATABASE SYNC ===\n";

// Keep an existing production database compatible with the canonical
// curriculum-key linkage before querying or inserting synchronized lessons.
\App\Services\VideoService::ensureSchema();

$manifestFile = __DIR__ . '/../storage/curriculum/manifest.json';
if (!file_exists($manifestFile)) {
    die("Error: manifest.json not found at $manifestFile\n");
}

$manifest = json_decode(file_get_contents($manifestFile), true);
if (!$manifest) {
    die("Error: Failed to parse manifest.json\n");
}

// 1. Ensure Default Admin/Official Teacher exists for curriculum courses
$teacher = Database::selectOne("SELECT id, uuid FROM teachers LIMIT 1");
if (!$teacher) {
    echo "Creating Default Official Curriculum Teacher...\n";
    $identUuid = sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0x0fff)|0x4000,mt_rand(0,0x3fff)|0x8000,mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0xffff));
    $identId = Database::insert(
        "INSERT INTO auth_identities (uuid, phone_number, phone_hash, status) VALUES (?, ?, ?, 'active')",
        [$identUuid, \App\Core\Security::encrypt('962790000000'), \App\Core\Security::blindIndex('962790000000')]
    );
    $teachUuid = sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0x0fff)|0x4000,mt_rand(0,0x3fff)|0x8000,mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0xffff));
    $teacherId = Database::insert(
        "INSERT INTO teachers (uuid, identity_id, full_name, specialization, bio) VALUES (?, ?, 'فريق صَقِل للمناهج الرسمية', 'المناهج الوزارية المطورة', 'الجهة الرسمية لإعداد وفهرسة المناهج الوزارية المطورة لوزارة التربية والتعليم')",
        [$teachUuid, $identId]
    );
    $teacher = ['id' => $teacherId, 'uuid' => $teachUuid];
}
$teacherId = (int)$teacher['id'];

// 2. Iterate through Grades and Subjects in manifest
foreach ($manifest as $gradeKey => $grade) {
    $gradeName = $grade['name'] ?? $gradeKey;

    foreach ($grade['subjects'] as $subjectKey => $subjectData) {
        $subjectName = $subjectData['name'] ?? $subjectKey;
        $stream = 'scientific';
        if (str_contains($subjectKey, 'english')) {
            $stream = 'common';
        }

        // A. Insert/Update Subject
        $dbSubject = Database::selectOne("SELECT id FROM subjects WHERE code = ? LIMIT 1", [$subjectKey]);
        if (!$dbSubject) {
            $subId = Database::insert(
                "INSERT INTO subjects (name, code, stream, is_active) VALUES (?, ?, ?, 1)",
                [$subjectName, $subjectKey, $stream]
            );
            echo "✅ Created Subject: {$subjectName} (code: {$subjectKey})\n";
        } else {
            $subId = (int)$dbSubject['id'];
            Database::query("UPDATE subjects SET name = ? WHERE id = ?", [$subjectName, $subId]);
        }

        // B. Insert/Update Courses for each Semester
        foreach ($subjectData['semesters'] as $semesterKey => $semesterData) {
            $semType = ($semesterKey === 'semester_2') ? 'second' : 'first';
            $courseTitle = "{$subjectName} — {$gradeName} (" . ($semType === 'first' ? 'الفصل الأول' : 'الفصل الثاني') . ")";
            
            $dbCourse = Database::selectOne("SELECT id FROM courses WHERE subject_id = ? AND semester = ? LIMIT 1", [$subId, $semType]);
            if (!$dbCourse) {
                $cUuid = sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0x0fff)|0x4000,mt_rand(0,0x3fff)|0x8000,mt_rand(0,0xffff),mt_rand(0,0xffff),mt_rand(0,0xffff));
                $courseId = Database::insert(
                    "INSERT INTO courses (uuid, subject_id, teacher_id, title, description, semester, price_jod, is_published) 
                     VALUES (?, ?, ?, ?, ?, ?, 0.00, 1)",
                    [$cUuid, $subId, $teacherId, $courseTitle, "المساق الوزاري الرسمي المعتمد والمفرغ تفاعلياً لمنهاج {$subjectName}", $semType]
                );
                echo "  📚 Created Course: {$courseTitle} (ID: {$courseId})\n";
            } else {
                $courseId = (int)$dbCourse['id'];
                Database::query("UPDATE courses SET title = ? WHERE id = ?", [$courseTitle, $courseId]);
            }

            // C. Insert/Update Lessons under each Unit
            $seqOrder = 1;
            foreach ($semesterData['units'] as $unitKey => $unitData) {
                $unitName = $unitData['name'] ?? $unitKey;

                foreach ($unitData['lessons'] as $les) {
                    $lessonTitle = $les['title'];
                    $filePath = $les['file'];
                    $fullDiskPath = __DIR__ . '/../storage/curriculum/' . $filePath;

                    $mdContent = '';
                    if (file_exists($fullDiskPath)) {
                        $mdContent = file_get_contents($fullDiskPath);
                    }

                    $aiVideoUrl = $les['ai_video_url'] ?? null;
                    $cheatSheet = $les['cheat_sheet'] ?? null;
                    $socraticQuiz = isset($les['socratic_quiz']) ? json_encode($les['socratic_quiz'], JSON_UNESCAPED_UNICODE) : null;

                    // The manifest file path is the canonical, globally unique lesson key.
                    $dbLesson = Database::selectOne(
                        "SELECT id FROM lessons WHERE curriculum_key = ? OR (course_id = ? AND title = ?) LIMIT 1",
                        [$filePath, $courseId, $lessonTitle]
                    );

                    if (!$dbLesson) {
                        $lesId = Database::insert(
                            "INSERT INTO lessons (course_id, title, curriculum_key, sequence_order, ai_video_url, markdown_content, cheat_sheet_markdown, socratic_quiz_json, is_free_preview)
                             VALUES (?, ?, ?, ?, ?, ?, ?, ?, 1)",
                            [$courseId, $lessonTitle, $filePath, $seqOrder, $aiVideoUrl, $mdContent, $cheatSheet, $socraticQuiz]
                        );
                        echo "    📄 [NEW] Lesson inserted: {$lessonTitle} (ID: {$lesId})\n";
                    } else {
                        $lesId = (int)$dbLesson['id'];
                        Database::query(
                            "UPDATE lessons SET curriculum_key = ?, sequence_order = ?, markdown_content = ?, ai_video_url = COALESCE(?, ai_video_url), cheat_sheet_markdown = COALESCE(?, cheat_sheet_markdown), socratic_quiz_json = COALESCE(?, socratic_quiz_json) WHERE id = ?",
                            [$filePath, $seqOrder, $mdContent, $aiVideoUrl, $cheatSheet, $socraticQuiz, $lesId]
                        );
                        echo "    🔄 [UPDATED] Lesson: {$lessonTitle} (ID: {$lesId})\n";
                    }
                    $seqOrder++;
                }
            }

            // D. Insert Resources (Books, Activity Books)
            if (!empty($semesterData['resources'])) {
                foreach ($semesterData['resources'] as $resGroupKey => $resGroup) {
                    foreach ($resGroup['items'] as $resItem) {
                        $resTitle = $resItem['title'];
                        $resFilePath = $resItem['file'];
                        $resDiskPath = __DIR__ . '/../storage/curriculum/' . $resFilePath;
                        $resMd = file_exists($resDiskPath) ? file_get_contents($resDiskPath) : '';

                        // Add as special lesson / resource entry
                        $dbResLesson = Database::selectOne(
                            "SELECT id FROM lessons WHERE course_id = ? AND title = ? LIMIT 1",
                            [$courseId, $resTitle]
                        );
                        if (!$dbResLesson) {
                            Database::insert(
                                "INSERT INTO lessons (course_id, title, sequence_order, markdown_content, is_free_preview) 
                                 VALUES (?, ?, ?, ?, 1)",
                                [$courseId, $resTitle, $seqOrder, $resMd]
                            );
                            echo "    📎 [RESOURCE] Added Resource: {$resTitle}\n";
                        }
                        $seqOrder++;
                    }
                }
            }
        }
    }
}

echo "\n🎉 SUCCESS! All curriculum subjects, courses, and lessons are synchronized with MySQL database!\n";