<?php
declare(strict_types=1);
namespace App\Services;
use App\Core\Database;

/** Reads only the reviewed package attached to the exact published curriculum lesson. */
final class LearningPackageService {
    public static function publishedEnglish(string $lessonUuid,int $studentId,?string $nationalId):array {
        if(!preg_match('/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i',$lessonUuid))return ['http_status'=>400,'status'=>'error','message'=>'هوية الدرس غير صالحة.'];
        $lesson=Database::selectOne("SELECT cl.id,cl.uuid,cl.grade_key,cl.title FROM curriculum_lessons cl WHERE cl.uuid=? AND cl.source_status='approved' LIMIT 1",[$lessonUuid]);
        if(!$lesson)return ['http_status'=>404,'status'=>'error','message'=>'الدرس غير منشور.'];
        $access=StudentAccessControlService::validateLessonAccess($studentId,$nationalId,StudentAccessControlService::normalizeGrade((string)$lesson['grade_key']),null,null,false);
        if(empty($access['allowed']))return ['http_status'=>403,'status'=>'forbidden','message'=>$access['message']??'غير مصرح بالوصول إلى الدرس.'];
        $package=Database::selectOne("SELECT lp.id,lp.structure_json,pb.bundle_version FROM lesson_learning_packages lp JOIN publication_bundles pb ON pb.id=lp.bundle_id AND pb.status='published' WHERE lp.curriculum_lesson_id=? AND lp.package_type='english' AND lp.status='published' LIMIT 1",[$lesson['id']]);
        if(!$package)return ['http_status'=>404,'status'=>'not_ready','message'=>'حزمة الإنجليزية المعتمدة لهذا الدرس لم تُنشر بعد.'];
        $entries=Database::select("SELECT e.lemma,e.part_of_speech,e.meaning_ar,e.ipa_verified,a.uuid AS audio_asset_id FROM english_lexical_entries e LEFT JOIN content_assets a ON a.id=e.audio_asset_id AND a.review_status='approved' WHERE e.lesson_learning_package_id=? AND e.review_status='approved' ORDER BY e.id",[$package['id']]);
        return ['http_status'=>200,'status'=>'success','data'=>['curriculum_lesson_id'=>$lesson['uuid'],'title'=>$lesson['title'],'bundle_version'=>$package['bundle_version'],'structure'=>json_decode((string)$package['structure_json'],true)??[],'lexical_entries'=>$entries]];
    }
}