<?php

declare(strict_types=1);

/**
 * Publishes Grade 10 textbook PDFs into content_assets and publication_bundle_assets
 * so they appear in the student app under "الكتب المقررة" for each subject.
 *
 * Usage:
 *   php backend/scripts/publish_grade10_textbooks.php [--apply]
 */

require_once dirname(__DIR__) . '/app/bootstrap.php';

use App\Core\Database;

$apply = in_array('--apply', $argv, true);
$projectRoot = dirname(__DIR__, 2);
$booksRoot = $projectRoot . '/books';
$curriculumRoot = $projectRoot . '/backend/storage/curriculum';

echo "=== Publishing Grade 10 Textbooks ===\n";

if (!is_dir($booksRoot)) {
    echo "Books directory not found at {$booksRoot}\n";
    exit(1);
}

$pdfFiles = glob($booksRoot . '/*.pdf') ?: [];
echo "Found " . count($pdfFiles) . " textbook PDFs in {$booksRoot}.\n";

$subjectMap = [
    'كيمياء' => 'chemistry_10',
    'الرياضيات' => 'math_10',
    'الفيزياء' => 'physics_10',
    'الأحياء' => 'biology_10',
    'حياتية' => 'biology_10',
    'علوم الأرض' => 'earth_sciences_10',
    'اللغة العربية' => 'arabic_10',
    'العربية' => 'arabic_10',
    'الإنجليزية' => 'english_10',
    'الانجليزية' => 'english_10',
    'التربية الإسلامية' => 'islamic_10',
    'الإسلامية' => 'islamic_10',
    'تاريخ' => 'history_10',
    'جغرافيا' => 'geography_10',
    'الوطنية' => 'civics_10',
    'المالية' => 'financial_10',
    'الرقمية' => 'digital_skills_10',
    'حاسوب' => 'digital_skills_10',
];

$publishedCount = 0;

foreach ($pdfFiles as $filePath) {
    $filename = basename($filePath);
    $sha256 = hash_file('sha256', $filePath);
    $bytes = filesize($filePath);

    // Identify subject
    $matchedSubject = null;
    foreach ($subjectMap as $keyword => $subKey) {
        if (str_contains($filename, $keyword)) {
            $matchedSubject = $subKey;
            break;
        }
    }

    if (!$matchedSubject) {
        echo "  - Skipping unclassified PDF: {$filename}\n";
        continue;
    }

    $semesterKey = str_contains($filename, 'الثاني') ? 'semester_2' : 'semester_1';
    echo "\nProcessing: [{$matchedSubject} - {$semesterKey}] {$filename}\n";

    // Destination in curriculum storage
    $relativeDest = "textbooks/grade_10/{$matchedSubject}/" . basename($filePath);
    $fullDest = $curriculumRoot . '/' . $relativeDest;

    if ($apply) {
        $destDir = dirname($fullDest);
        if (!is_dir($destDir)) {
            mkdir($destDir, 0755, true);
        }
        if (!file_exists($fullDest) || hash_file('sha256', $fullDest) !== $sha256) {
            copy($filePath, $fullDest);
        }
    }

    // Find the representative published bundle for this subject
    $lesson = Database::selectOne(
        "SELECT cl.id, cl.uuid FROM curriculum_lessons cl
         JOIN publication_bundles pb ON pb.curriculum_lesson_id = cl.id
         WHERE cl.grade_key = 'grade_10' AND cl.subject_key = ? AND cl.semester_key = ?
         ORDER BY cl.unit_key ASC, cl.lesson_key ASC LIMIT 1",
        [$matchedSubject, $semesterKey]
    );

    if (!$lesson) {
        // Fallback: any lesson in the subject
        $lesson = Database::selectOne(
            "SELECT cl.id, cl.uuid FROM curriculum_lessons cl
             WHERE cl.grade_key = 'grade_10' AND cl.subject_key = ?
             ORDER BY cl.id ASC LIMIT 1",
            [$matchedSubject]
        );
    }

    if (!$lesson) {
        echo "  - No curriculum lesson found for {$matchedSubject}.\n";
        continue;
    }

    $lessonId = (int)$lesson['id'];

    // Ensure publication bundle exists
    $bundle = Database::selectOne(
        "SELECT id FROM publication_bundles WHERE curriculum_lesson_id = ? AND status = 'published' LIMIT 1",
        [$lessonId]
    );

    $bundleId = 0;
    if ($bundle) {
        $bundleId = (int)$bundle['id'];
    } elseif ($apply) {
        $bUuid = 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));
        $bundleId = (int)Database::insert(
            "INSERT INTO publication_bundles (uuid, curriculum_lesson_id, bundle_version, status, published_at)
             VALUES (?, ?, 'grade10-intake-2026-09-10', 'published', NOW())",
            [$bUuid, $lessonId]
        );
    }

    // Ensure content_asset exists
    $asset = Database::selectOne(
        "SELECT id, uuid FROM content_assets WHERE sha256 = ? LIMIT 1",
        [$sha256]
    );

    $assetId = 0;
    if ($asset) {
        $assetId = (int)$asset['id'];
        echo "  - Asset exists (ID: {$assetId})\n";
        if ($apply) {
            Database::query(
                "UPDATE content_assets SET review_status = 'approved', rights_status = 'cleared', storage_key = ? WHERE id = ?",
                [$relativeDest, $assetId]
            );
        }
    } elseif ($apply) {
        $aUuid = 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));
        $assetId = (int)Database::insert(
            "INSERT INTO content_assets 
                (uuid, asset_type, storage_driver, storage_key, mime_type, byte_size, sha256, rights_status, review_status)
             VALUES (?, 'textbook_pdf', 'local', ?, 'application/pdf', ?, ?, 'cleared', 'approved')",
            [$aUuid, $relativeDest, $bytes, $sha256]
        );
        echo "  - Created content_asset ID {$assetId}\n";
    }

    // Link in publication_bundle_assets
    if ($apply && $bundleId > 0 && $assetId > 0) {
        Database::query(
            "INSERT INTO publication_bundle_assets (publication_bundle_id, content_asset_id, role, sort_order)
             VALUES (?, ?, 'textbook', 1)
             ON DUPLICATE KEY UPDATE role = 'textbook'",
            [$bundleId, $assetId]
        );
        echo "  - Linked to publication bundle {$bundleId} as textbook.\n";
        $publishedCount++;
    }
}

if ($apply) {
    echo "\n=== Successfully published {$publishedCount} textbooks! ===\n";
} else {
    echo "\nDRY RUN complete. Run with --apply to execute.\n";
}