Untitled

    public function index()
    {
        $title = 'Trang chủ';
        $courses = Course::all();
        $enrollments = Auth::check() ? Enrollment::where('user_id', Auth::id())->get() : null;
        $userId = Auth::check() ? Auth::id() : null;
        $courseProgress = [];

        $enrollmentStatus = [];
        $links = [];
        $posts = Post::with('course')->latest()->get();

        if ($userId) {
            foreach ($courses as $course) {
                $isEnrolled = Enrollment::where('user_id', $userId)->where('course_id', $course->id)->exists();
                $enrollmentStatus[$course->id] = $isEnrolled;

                if ($isEnrolled) {
                    $firstSection = Section::where('course_id', $course->id)->first();
                    if ($firstSection) {
                        $firstLesson = Lesson::where('section_id', $firstSection->id)->first();
                        $lessonId = $firstLesson ? $firstLesson->id : null;
                        $links[$course->id] = $lessonId ? route('lesson', $lessonId) : route('detail', $course->id);
                    } else {
                        $links[$course->id] = route('detail', $course->id);
                    }
                } else {
                    $links[$course->id] = route('detail', $course->id);
                }
            }
        }

        if ($userId) {
            foreach ($courses as $course) {
                $progress = UserCourseProgress::where('course_id', $course->id)->where('user_id', $userId)->first();
                $courseProgress[$course->id] = $progress ? $progress->progress : 0;
            }
        }

        return view('index', compact('title', 'courses', 'enrollmentStatus', 'enrollments', 'links', 'courseProgress', 'posts'));
    }