@extends('layouts.dashboard')
@section('title', __('Curriculum'))
@section('page_title', __('Curriculum'))

@section('content')
<div class="d-flex align-items-center justify-content-between mb-4">
    <div class="d-flex align-items-center">
        <a href="{{ route('instructor.courses.index') }}" class="btn btn-light btn-sm me-3"><i class="bi bi-arrow-left"></i></a>
        <div>
            <h4 class="mb-0 fw-bold">{{ __('Curriculum') }}</h4>
            <p class="text-muted small mb-0">{{ $course->title }}</p>
        </div>
    </div>
    <a href="{{ route('instructor.courses.show', $course) }}" class="btn btn-outline-secondary"><i class="bi bi-eye me-1"></i> {{ __('Preview') }}</a>
</div>

<div class="row g-4">
    <div class="col-lg-8">
        @if($course->sections->isNotEmpty())
            <p class="text-muted small mb-2"><i class="bi bi-grip-vertical me-1"></i>{{ __('Drag sections and lessons to reorder them — lessons can also be moved between sections. Order saves automatically.') }} <span id="lfOrderStatus" class="ms-1"></span></p>
        @endif
        <div class="accordion lf-section-list" id="curriculumAccordion">
            @forelse ($course->sections as $section)
                <div class="accordion-item border-0 shadow-sm mb-3 rounded overflow-hidden lf-section-item" data-id="{{ $section->id }}">
                    <h2 class="accordion-header d-flex align-items-stretch">
                        <span class="lf-drag lf-section-drag d-flex align-items-center px-3 text-muted" style="cursor:grab" title="{{ __('Drag to reorder') }}"><i class="bi bi-grip-vertical"></i></span>
                        <button class="accordion-button {{ $loop->first ? '' : 'collapsed' }} ps-0" type="button"
                                data-bs-toggle="collapse" data-bs-target="#section{{ $section->id }}">
                            <span class="fw-semibold"><span class="lf-section-no">{{ __('Section') }} {{ $loop->iteration }}</span>: {{ $section->title }}</span>
                            <span class="badge bg-light text-dark ms-2 lf-lesson-count">{{ $section->lessons->count() }} {{ __('lessons') }}</span>
                        </button>
                    </h2>
                    <div id="section{{ $section->id }}" class="accordion-collapse collapse {{ $loop->first ? 'show' : '' }}" data-bs-parent="#curriculumAccordion">
                        <div class="accordion-body">
                            <ul class="list-group mb-3 lf-lesson-list" data-section="{{ $section->id }}">
                                @forelse ($section->lessons as $lesson)
                                    <li class="list-group-item lf-lesson-item" data-id="{{ $lesson->id }}">
                                    <div class="d-flex justify-content-between align-items-center">
                                        <span class="lf-drag text-muted me-2 flex-shrink-0" style="cursor:grab" title="{{ __('Drag to reorder') }}"><i class="bi bi-grip-vertical"></i></span>
                                        <span class="flex-grow-1">
                                            <i class="bi bi-{{ $lesson->lesson_type === 'video' ? 'play-circle' : ($lesson->lesson_type === 'audio' ? 'music-note-beamed' : ($lesson->lesson_type === 'scorm' ? 'box-seam' : 'file-text')) }} me-2 text-primary"></i>
                                            {{ $lesson->title }}
                                            <span class="badge bg-secondary-subtle text-secondary-emphasis text-capitalize ms-1">{{ status_label($lesson->lesson_type) }}</span>
                                            @if ($lesson->is_preview)
                                                <span class="badge bg-info-subtle text-info-emphasis ms-1">{{ __('Preview') }}</span>
                                            @endif
                                            @if ($lesson->duration)
                                                <small class="text-muted ms-1">{{ __(':count min', ['count' => $lesson->duration]) }}</small>
                                            @endif
                                        </span>
                                        <span class="d-inline-flex align-items-center gap-1 flex-shrink-0">
                                            @if($lesson->file_path)<span class="badge bg-light text-dark border" title="{{ __('Protected upload') }}"><i class="bi bi-shield-lock"></i></span>@endif
                                            @if(!empty($lesson->subtitles))<span class="badge bg-light text-dark border" title="{{ __('Subtitles') }}"><i class="bi bi-badge-cc"></i> {{ count($lesson->subtitles) }}</span>@endif
                                            <button class="btn btn-sm btn-outline-secondary" type="button" data-bs-toggle="collapse" data-bs-target="#editLesson{{ $lesson->id }}" title="{{ __('Edit') }}"><i class="bi bi-pencil"></i></button>
                                            <form action="{{ route('instructor.lessons.destroy', $lesson) }}" method="POST" data-confirm="{{ __('Delete this lesson?') }}" class="d-inline-flex">
                                                @csrf @method('DELETE')
                                                <button class="btn btn-sm btn-outline-danger" title="{{ __('Delete') }}"><i class="bi bi-trash"></i></button>
                                            </form>
                                        </span>
                                    </div>
                                    <div class="collapse" id="editLesson{{ $lesson->id }}">
                                        @foreach($lesson->subtitles ?? [] as $sub)
                                            <form id="rmsub{{ $lesson->id }}-{{ $sub['lang'] }}" action="{{ route('instructor.lessons.subtitles.destroy', $lesson) }}" method="POST" class="d-none">@csrf @method('DELETE')<input type="hidden" name="lang" value="{{ $sub['lang'] }}"></form>
                                        @endforeach
                                        <form action="{{ route('instructor.lessons.update', $lesson) }}" method="POST" enctype="multipart/form-data" class="border rounded p-3 bg-light mt-2" data-lf-lesson-form>
                                            @csrf @method('PUT')
                                            @php($lessonRow = $lesson)
                                            <div class="row g-2">
                                                <div class="col-md-8"><input type="text" name="title" value="{{ $lesson->title }}" class="form-control form-control-sm" required></div>
                                                <div class="col-md-4">
                                                    <select name="lesson_type" class="form-select form-select-sm js-lesson-type" required>
                                                        @foreach(['video' => 'Video', 'text' => 'Text', 'pdf' => 'PDF', 'audio' => 'Audio', 'file' => 'File', 'live' => 'Live', 'scorm' => 'SCORM'] as $lt => $ltl)<option value="{{ $lt }}" @selected($lesson->lesson_type === $lt)>{{ __($ltl) }}</option>@endforeach
                                                    </select>
                                                </div>
                                        <div class="col-md-4" data-lf-field="source">
                                            <select name="video_source" class="form-select form-select-sm js-video-source">
                                                <option value="">{{ __('Source (video/audio)') }}</option>
                                                @foreach(\App\Support\Video::SOURCES as $srcKey => $srcLabel)
                                                    <option value="{{ $srcKey }}" @selected(($lesson->video_source ?? '') === $srcKey)>{{ __($srcLabel) }}</option>
                                                @endforeach
                                            </select>
                                        </div>
                                        <div class="col-md-8" data-lf-field="url">
                                            <input type="text" name="video_url" value="{{ $lesson->video_url ?? '' }}" class="form-control form-control-sm js-video-url" placeholder="{{ __('Video URL, or Bunny/Cloudflare video ID') }}">
                                        </div>
                                        <div class="col-md-6" data-lf-field="upload">
                                            <label class="form-label small text-muted mb-1">{{ __('Upload video / audio / PDF (protected, streamed via expiring links)') }}</label>
                                            <input type="file" name="video_file" class="form-control form-control-sm" accept="video/*,audio/*,application/pdf">
                                            @if(!empty($lesson->file_path))<div class="form-text"><i class="bi bi-shield-lock me-1"></i>{{ __('Current file') }}: {{ basename($lesson->file_path) }}</div>@endif
                                        </div>
                                        <div class="col-md-6" data-lf-field="poster">
                                            <label class="form-label small text-muted mb-1">{{ __('Poster image (optional)') }}</label>
                                            <input type="file" name="poster" class="form-control form-control-sm" accept="image/*">
                                        </div>
                                        <div class="col-md-6" data-lf-field="subtitles">
                                            <label class="form-label small text-muted mb-1">{{ __('Subtitle file (.vtt or .srt)') }}</label>
                                            <input type="file" name="subtitle_file" class="form-control form-control-sm" accept=".vtt,.srt,text/vtt">
                                        </div>
                                        <div class="col-md-3" data-lf-field="subtitles"><label class="form-label small text-muted mb-1">{{ __('Subtitle lang') }}</label><input type="text" name="subtitle_lang" class="form-control form-control-sm" placeholder="en"></div>
                                        <div class="col-md-3" data-lf-field="subtitles"><label class="form-label small text-muted mb-1">{{ __('Subtitle label') }}</label><input type="text" name="subtitle_label" class="form-control form-control-sm" placeholder="English"></div>
                                        <div class="col-md-6" data-lf-field="scorm">
                                            <label class="form-label small text-muted mb-1">{{ __('SCORM package (.zip, 1.2 or 2004)') }}</label>
                                            <input type="file" name="scorm_file" class="form-control form-control-sm" accept=".zip,application/zip">
                                            @if(!empty($lesson->scorm_launch))<div class="form-text"><i class="bi bi-box-seam me-1"></i>SCORM {{ $lesson->scorm_version }} · {{ basename($lesson->scorm_launch) }}</div>@endif
                                        </div>
                                        @php($lfAsr = app(\App\Support\Transcription\TranscriptionService::class))
                                        @if($lfAsr->isConfigured() && in_array($lesson->lesson_type, ['video', 'audio'], true))
                                            <div class="col-12" data-lf-field="subtitles">
                                                {{-- Speech-to-text: builds the first track from the lesson's own audio. Fields post to the asr form below via form="…". --}}
                                                <div class="d-flex flex-wrap align-items-end gap-2 border rounded p-2 bg-body">
                                                    <div>
                                                        <label class="form-label small mb-1">{{ __('Generate subtitles from audio') }}</label>
                                                        <div class="form-text mt-0">{{ __('Using :provider — runs in the background.', ['provider' => $lfAsr->label()]) }}</div>
                                                    </div>
                                                    <input type="text" name="lang" form="asr{{ $lesson->id }}" class="form-control form-control-sm" style="width:90px" placeholder="auto">
                                                    <input type="text" name="label" form="asr{{ $lesson->id }}" class="form-control form-control-sm" style="width:120px" placeholder="{{ __('Label') }}">
                                                    <button type="submit" form="asr{{ $lesson->id }}" class="btn btn-sm btn-outline-primary">
                                                        <i class="bi bi-badge-cc me-1"></i>{{ __('Transcribe') }}
                                                    </button>
                                                </div>
                                            </div>
                                        @endif
                                        @if(!empty($lesson->subtitles))
                                            <div class="col-12 d-flex flex-wrap gap-2" data-lf-field="subtitles">
                                                @foreach($lesson->subtitles as $sub)
                                                    <span class="badge bg-light text-dark border d-inline-flex align-items-center gap-1"><i class="bi bi-badge-cc"></i>{{ $sub['label'] ?? $sub['lang'] }}
                                                        <button type="submit" form="rmsub{{ $lesson->id }}-{{ $sub['lang'] }}" class="btn btn-link btn-sm p-0 text-danger" title="{{ __('Remove') }}"><i class="bi bi-x"></i></button></span>
                                                @endforeach
                                            </div>
                                        @endif
                                                <div class="col-12" data-lf-field="content"><textarea name="content" rows="3" class="form-control form-control-sm" placeholder="{{ __('Text content') }}">{{ $lesson->content }}</textarea></div>
                                                <div class="col-md-4"><input type="number" name="duration" min="0" value="{{ $lesson->duration }}" class="form-control form-control-sm" placeholder="{{ __('Duration (minutes)') }}"></div>
                                                <div class="col-md-4 d-flex align-items-center"><div class="form-check"><input type="hidden" name="is_preview" value="0"><input class="form-check-input" type="checkbox" name="is_preview" value="1" id="epreview{{ $lesson->id }}" @checked($lesson->is_preview)><label class="form-check-label small" for="epreview{{ $lesson->id }}">{{ __('Free preview') }}</label></div></div>
                                                <div class="col-md-4 d-flex align-items-center" data-lf-field="downloadable"><div class="form-check"><input type="hidden" name="is_downloadable" value="0"><input class="form-check-input" type="checkbox" name="is_downloadable" value="1" id="edl{{ $lesson->id }}" @checked($lesson->is_downloadable)><label class="form-check-label small" for="edl{{ $lesson->id }}">{{ __('Downloadable') }}</label></div></div>
                                                @include('instructor.courses._drip-fields', ['uid' => 'l'.$lesson->id, 'lesson' => $lesson, 'lessons' => $allLessons, 'quizzes' => $quizzes])
                                                <div class="col-12 text-end"><button class="btn btn-sm btn-primary">{{ __('Update Lesson') }}</button></div>
                                            </div>
                                        </form>

                                        @if(app(\App\Support\Transcription\TranscriptionService::class)->isConfigured())
                                            {{-- The fields live in the edit form above and post here via form="…". --}}
                                            <form id="asr{{ $lesson->id }}" method="POST" action="{{ route('instructor.lessons.subtitles.transcribe', $lesson) }}" class="d-none">
                                                @csrf
                                            </form>
                                        @endif
                                    </div>
                                    </li>
                                @empty
                                    <li class="list-group-item text-muted small lf-lesson-empty">{{ __('No lessons yet.') }}</li>
                                @endforelse
                            </ul>

                            <button class="btn btn-sm btn-outline-primary mb-2" type="button" data-bs-toggle="collapse" data-bs-target="#addLesson{{ $section->id }}">
                                <i class="bi bi-plus-lg me-1"></i> {{ __('Add Lesson') }}
                            </button>

                            <button class="btn btn-sm btn-outline-danger mb-2" type="button" data-bs-toggle="collapse" data-bs-target="#importPlaylist{{ $section->id }}">
                                <i class="bi bi-youtube me-1"></i> {{ __('Import YouTube playlist') }}
                            </button>

                            <div class="collapse {{ $errors->has('playlist_url') && old('_section') == $section->id ? 'show' : '' }}" id="importPlaylist{{ $section->id }}">
                                <form action="{{ route('instructor.lessons.import-playlist', $section) }}" method="POST" class="border rounded p-3 bg-light mb-2">
                                    @csrf
                                    <input type="hidden" name="_section" value="{{ $section->id }}">
                                    <label class="form-label small text-muted mb-1">{{ __('Playlist link') }}</label>
                                    <div class="input-group input-group-sm">
                                        <input type="text" name="playlist_url" value="{{ old('_section') == $section->id ? old('playlist_url') : '' }}" class="form-control @if($errors->has('playlist_url') && old('_section') == $section->id) is-invalid @endif" placeholder="https://www.youtube.com/playlist?list=PL…" required>
                                        <button class="btn btn-danger">{{ __('Import') }}</button>
                                    </div>
                                    @if($errors->has('playlist_url') && old('_section') == $section->id)<div class="text-danger small mt-1">{{ $errors->first('playlist_url') }}</div>@endif
                                    <div class="form-text">{{ __('Every video becomes a lesson in this section, in playlist order. The playlist must be public or unlisted.') }}</div>
                                </form>
                            </div>

                            <div class="collapse" id="addLesson{{ $section->id }}">
                                <form action="{{ route('instructor.lessons.store', $section) }}" method="POST" enctype="multipart/form-data" class="border rounded p-3 bg-light" data-lf-lesson-form>
                                    @csrf
                                    <div class="row g-2">
                                        <div class="col-md-8">
                                            <input type="text" name="title" class="form-control form-control-sm" placeholder="{{ __('Lesson title') }}" required>
                                        </div>
                                        <div class="col-md-4">
                                            <select name="lesson_type" class="form-select form-select-sm js-lesson-type" required>
                                                <option value="video">{{ __('Video') }}</option>
                                                <option value="text">{{ __('Text') }}</option>
                                                <option value="pdf">PDF</option>
                                                <option value="audio">{{ __('Audio') }}</option>
                                                <option value="file">{{ __('File') }}</option>
                                                <option value="live">{{ __('Live') }}</option>
                                                <option value="scorm">SCORM</option>
                                            </select>
                                        </div>
                                        @php($lessonRow = null)
                                        <div class="col-md-4" data-lf-field="source">
                                            <select name="video_source" class="form-select form-select-sm js-video-source">
                                                <option value="">{{ __('Source (video/audio)') }}</option>
                                                @foreach(\App\Support\Video::SOURCES as $srcKey => $srcLabel)
                                                    <option value="{{ $srcKey }}" @selected(($lessonRow->video_source ?? '') === $srcKey)>{{ __($srcLabel) }}</option>
                                                @endforeach
                                            </select>
                                        </div>
                                        <div class="col-md-8" data-lf-field="url">
                                            <input type="text" name="video_url" value="{{ $lessonRow->video_url ?? '' }}" class="form-control form-control-sm js-video-url" placeholder="{{ __('Video URL, or Bunny/Cloudflare video ID') }}">
                                        </div>
                                        <div class="col-md-6" data-lf-field="upload">
                                            <label class="form-label small text-muted mb-1">{{ __('Upload video / audio / PDF (protected, streamed via expiring links)') }}</label>
                                            <input type="file" name="video_file" class="form-control form-control-sm" accept="video/*,audio/*,application/pdf">
                                            @if(!empty($lessonRow->file_path))<div class="form-text"><i class="bi bi-shield-lock me-1"></i>{{ __('Current file') }}: {{ basename($lessonRow->file_path) }}</div>@endif
                                        </div>
                                        <div class="col-md-6" data-lf-field="poster">
                                            <label class="form-label small text-muted mb-1">{{ __('Poster image (optional)') }}</label>
                                            <input type="file" name="poster" class="form-control form-control-sm" accept="image/*">
                                        </div>
                                        <div class="col-md-6" data-lf-field="subtitles">
                                            <label class="form-label small text-muted mb-1">{{ __('Subtitle file (.vtt or .srt)') }}</label>
                                            <input type="file" name="subtitle_file" class="form-control form-control-sm" accept=".vtt,.srt,text/vtt">
                                        </div>
                                        <div class="col-md-3" data-lf-field="subtitles"><label class="form-label small text-muted mb-1">{{ __('Subtitle lang') }}</label><input type="text" name="subtitle_lang" class="form-control form-control-sm" placeholder="en"></div>
                                        <div class="col-md-3" data-lf-field="subtitles"><label class="form-label small text-muted mb-1">{{ __('Subtitle label') }}</label><input type="text" name="subtitle_label" class="form-control form-control-sm" placeholder="English"></div>
                                        <div class="col-md-6" data-lf-field="scorm">
                                            <label class="form-label small text-muted mb-1">{{ __('SCORM package (.zip, 1.2 or 2004)') }}</label>
                                            <input type="file" name="scorm_file" class="form-control form-control-sm" accept=".zip,application/zip">
                                            @if(!empty($lessonRow->scorm_launch))<div class="form-text"><i class="bi bi-box-seam me-1"></i>SCORM {{ $lessonRow->scorm_version }} · {{ basename($lessonRow->scorm_launch) }}</div>@endif
                                        </div>
                                        @if(!empty($lessonRow->subtitles))
                                            <div class="col-12 d-flex flex-wrap gap-2" data-lf-field="subtitles">
                                                @foreach($lessonRow->subtitles as $sub)
                                                    <span class="badge bg-light text-dark border d-inline-flex align-items-center gap-1"><i class="bi bi-badge-cc"></i>{{ $sub['label'] ?? $sub['lang'] }}
                                                        <button type="submit" form="rmsub{{ $lessonRow->id }}-{{ $sub['lang'] }}" class="btn btn-link btn-sm p-0 text-danger" title="{{ __('Remove') }}"><i class="bi bi-x"></i></button></span>
                                                @endforeach
                                            </div>
                                        @endif
                                        <div class="col-12" data-lf-field="content">
                                            <textarea name="content" rows="2" class="form-control form-control-sm" placeholder="{{ __('Text content (for text lessons)') }}"></textarea>
                                        </div>
                                        <div class="col-md-6">
                                            <input type="number" name="duration" min="0" class="form-control form-control-sm" placeholder="{{ __('Duration (minutes)') }}">
                                        </div>
                                        <div class="col-md-3 d-flex align-items-center">
                                            <div class="form-check">
                                                <input type="hidden" name="is_preview" value="0">
                                                <input class="form-check-input" type="checkbox" name="is_preview" value="1" id="preview{{ $section->id }}">
                                                <label class="form-check-label small" for="preview{{ $section->id }}">{{ __('Free preview') }}</label>
                                            </div>
                                        </div>
                                        <div class="col-md-3 d-flex align-items-center" data-lf-field="downloadable">
                                            <div class="form-check">
                                                <input type="hidden" name="is_downloadable" value="0">
                                                <input class="form-check-input" type="checkbox" name="is_downloadable" value="1" id="downloadable{{ $section->id }}">
                                                <label class="form-check-label small" for="downloadable{{ $section->id }}">{{ __('Downloadable') }}</label>
                                            </div>
                                        </div>
                                        @include('instructor.courses._drip-fields', ['uid' => 's'.$section->id, 'lesson' => null, 'lessons' => $allLessons, 'quizzes' => $quizzes])
                                        <div class="col-12 text-end">
                                            <button class="btn btn-sm btn-primary">{{ __('Save Lesson') }}</button>
                                        </div>
                                    </div>
                                </form>
                            </div>

                            <button class="btn btn-sm btn-outline-secondary mb-2 ms-2" type="button" data-bs-toggle="collapse" data-bs-target="#secRules{{ $section->id }}">
                                <i class="bi bi-clock-history me-1"></i> {{ __('Section rules') }}
                            </button>
                            <div class="collapse" id="secRules{{ $section->id }}">
                                <form action="{{ route('instructor.sections.update', $section) }}" method="POST" class="border rounded p-3 bg-light mb-2">
                                    @csrf @method('PUT')
                                    <div class="row g-2">
                                        <div class="col-md-4">
                                            <label class="form-label small mb-1">{{ __('Section title') }}</label>
                                            <input type="text" name="title" value="{{ $section->title }}" class="form-control form-control-sm" required>
                                        </div>
                                        <div class="col-md-4">
                                            <label class="form-label small mb-1">{{ __('Release') }}</label>
                                            <select name="drip_type" class="form-select form-select-sm lf-drip-type" data-uid="sec{{ $section->id }}">
                                                <option value="none" @selected($section->drip_type === 'none')>{{ __('Immediately') }}</option>
                                                <option value="days_after_enroll" @selected($section->drip_type === 'days_after_enroll')>{{ __('N days after enrolment') }}</option>
                                                <option value="fixed_date" @selected($section->drip_type === 'fixed_date')>{{ __('On a fixed date') }}</option>
                                            </select>
                                        </div>
                                        <div class="col-md-2 lf-drip-days-sec{{ $section->id }}">
                                            <label class="form-label small mb-1">{{ __('Days') }}</label>
                                            <input type="number" name="drip_days" min="0" max="3650" value="{{ $section->drip_days }}" class="form-control form-control-sm">
                                        </div>
                                        <div class="col-md-2 lf-drip-date-sec{{ $section->id }}">
                                            <label class="form-label small mb-1">{{ __('Date') }}</label>
                                            <input type="datetime-local" name="drip_date" value="{{ optional($section->drip_date)->format('Y-m-d\TH:i') }}" class="form-control form-control-sm">
                                        </div>
                                        <div class="col-12 text-end"><button class="btn btn-sm btn-primary">{{ __('Save rules') }}</button></div>
                                    </div>
                                </form>
                            </div>

                            <form action="{{ route('instructor.sections.destroy', $section) }}" method="POST" class="d-inline ms-2" data-confirm="{{ __('Delete this section and all its lessons?') }}">
                                @csrf @method('DELETE')
                                <button class="btn btn-sm btn-outline-danger mb-2"><i class="bi bi-trash me-1"></i> {{ __('Delete Section') }}</button>
                            </form>
                        </div>
                    </div>
                </div>
            @empty
                <div class="card border-0 shadow-sm">
                    <div class="card-body text-center text-muted py-5">
                        <i class="bi bi-list-task display-6 d-block mb-2"></i>
                        {{ __('No sections yet. Add your first section to start building the curriculum.') }}
                    </div>
                </div>
            @endforelse
        </div>
    </div>

    <div class="col-lg-4">
        <div class="card border-0 shadow-sm">
            <div class="card-header bg-white fw-semibold py-3">{{ __('Add Section') }}</div>
            <div class="card-body">
                @if(module_enabled('ai') && setting('ai_generator_enabled', '1') === '1')
                    <a href="{{ route('instructor.ai.index', [$course, 'tab' => 'outline']) }}" class="btn btn-outline-primary btn-sm w-100 mb-3"><i class="bi bi-stars me-1"></i> {{ __('Generate outline with AI') }}</a>
                @endif
                <form action="{{ route('instructor.sections.store', $course) }}" method="POST">
                    @csrf
                    <div class="mb-3">
                        <label class="form-label">{{ __('Section Title') }}</label>
                        <input type="text" name="title" class="form-control" placeholder="{{ __('e.g. Getting Started') }}" required>
                    </div>
                    <button class="btn btn-primary w-100"><i class="bi bi-plus-lg me-1"></i> {{ __('Add Section') }}</button>
                </form>
            </div>
        </div>
    </div>
</div>
@endsection

@push('scripts')
<script src="https://cdn.jsdelivr.net/npm/sortablejs@1.15.2/Sortable.min.js"></script>
<script>
(function () {
    if (!window.Sortable) return;
    var status = document.getElementById('lfOrderStatus');
    var url = @json(route('instructor.courses.curriculum.reorder', $course));
    var timer = null;

    function flash(text, cls) {
        if (!status) return;
        status.textContent = text;
        status.className = 'ms-1 ' + cls;
        clearTimeout(timer);
        timer = setTimeout(function () { status.textContent = ''; }, 2500);
    }

    function renumber() {
        document.querySelectorAll('.lf-section-item').forEach(function (sec, i) {
            var no = sec.querySelector('.lf-section-no');
            if (no) no.textContent = @json(__('Section')) + ' ' + (i + 1);
            var count = sec.querySelectorAll('.lf-lesson-item').length;
            var badge = sec.querySelector('.lf-lesson-count');
            if (badge) badge.textContent = count + ' ' + @json(__('lessons'));
            var empty = sec.querySelector('.lf-lesson-empty');
            if (empty) empty.hidden = count > 0;
        });
    }

    function save() {
        var payload = [];
        document.querySelectorAll('.lf-section-item').forEach(function (sec) {
            payload.push({
                id: parseInt(sec.dataset.id, 10),
                lessons: Array.prototype.map.call(sec.querySelectorAll('.lf-lesson-item'), function (li) { return parseInt(li.dataset.id, 10); })
            });
        });
        renumber();
        flash(@json(__('Saving…')), 'text-muted');
        fetch(url, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', 'X-CSRF-TOKEN': (window.LEARNIFY && window.LEARNIFY.csrf) || document.querySelector('meta[name=csrf-token]').content, 'Accept': 'application/json' },
            body: JSON.stringify({ sections: payload })
        }).then(function (r) { return r.ok ? r.json() : Promise.reject(r); })
          .then(function () { flash(@json(__('Order saved')), 'text-success'); })
          .catch(function () { flash(@json(__('Could not save order — reload and try again.')), 'text-danger'); });
    }

    Sortable.create(document.getElementById('curriculumAccordion'), {
        handle: '.lf-section-drag', draggable: '.lf-section-item', animation: 150, ghostClass: 'opacity-50', onEnd: save
    });
    document.querySelectorAll('.lf-lesson-list').forEach(function (list) {
        Sortable.create(list, {
            group: 'lessons', handle: '.lf-drag', draggable: '.lf-lesson-item', animation: 150, ghostClass: 'opacity-50', onEnd: save
        });
    });
})();

// Show only the fields relevant to the selected lesson type / video source.
// Hidden fields are disabled so they never submit.
(function () {
    var NO_SOURCE = ['text', 'live', 'scorm'];
    var HAS_SOURCE = ['video', 'audio'];
    var UPLOAD_ONLY_TYPES = ['pdf', 'file'];
    var EXTERNAL_SOURCES = ['youtube', 'vimeo', 'bunny', 'cloudflare'];
    var DIRECT_SOURCES = ['s3', 'external', 'url', ''];

    function setGroup(form, name, visible) {
        form.querySelectorAll('[data-lf-field="' + name + '"]').forEach(function (el) {
            el.hidden = !visible;
            el.querySelectorAll('input, select, textarea, button').forEach(function (field) {
                field.disabled = !visible;
            });
        });
    }

    function applyLessonForm(form) {
        var typeSelect = form.querySelector('.js-lesson-type');
        var sourceSelect = form.querySelector('.js-video-source');
        var type = typeSelect ? typeSelect.value : 'video';
        var source = sourceSelect ? sourceSelect.value : '';

        var hasSource = HAS_SOURCE.indexOf(type) !== -1;
        var uploadOnly = UPLOAD_ONLY_TYPES.indexOf(type) !== -1;
        var isLocal = source === 'local' || source === '';
        var isExternalProvider = EXTERNAL_SOURCES.indexOf(source) !== -1;
        var isDirect = DIRECT_SOURCES.indexOf(source) !== -1;

        setGroup(form, 'source', hasSource);
        setGroup(form, 'url', (hasSource && !isLocal) || uploadOnly);
        setGroup(form, 'upload', (hasSource && isLocal) || uploadOnly);
        setGroup(form, 'poster', type === 'video' && isDirect);
        setGroup(form, 'subtitles', hasSource && isDirect);
        setGroup(form, 'downloadable', (hasSource || uploadOnly) && !isExternalProvider);
        setGroup(form, 'scorm', type === 'scorm');
        setGroup(form, 'content', type === 'text' || type === 'live');

        if (sourceSelect) sourceSelect.disabled = !hasSource;

        var urlField = form.querySelector('.js-video-url');
        if (urlField && hasSource) {
            var placeholders = {
                youtube: @json(__('YouTube URL')),
                vimeo: @json(__('Vimeo URL')),
                bunny: @json(__('Bunny video ID or embed URL')),
                cloudflare: @json(__('Cloudflare Stream video ID or URL')),
                s3: @json(__('Direct .mp4 / .m3u8 URL')),
                external: @json(__('Direct .mp4 / .m3u8 URL')),
                url: @json(__('Direct .mp4 / .m3u8 URL'))
            };
            urlField.placeholder = placeholders[source] || {{ \Illuminate\Support\Js::from(__('Video URL, or Bunny/Cloudflare video ID')) }};
        }
    }

    function applyAll() {
        document.querySelectorAll('[data-lf-lesson-form]').forEach(applyLessonForm);
    }

    document.addEventListener('change', function (e) {
        if (e.target.matches('.js-lesson-type, .js-video-source')) {
            var form = e.target.closest('[data-lf-lesson-form]');
            if (form) applyLessonForm(form);
        }
    });

    applyAll();
    // Re-apply once Bootstrap finishes expanding a collapsed edit/add panel,
    // since hidden-but-not-yet-initialised forms are otherwise fine, but this keeps it robust.
    document.addEventListener('shown.bs.collapse', function (e) {
        e.target.querySelectorAll('[data-lf-lesson-form]').forEach(applyLessonForm);
    });
})();
</script>
@endpush