@extends('layouts.admin')

@section('title', $set->title)
@section('header', $set->title)

@section('breadcrumb')
<li class="breadcrumb-item"><a href="{{ route('admin.questionnaires.index') }}">Soalselidik</a></li>
<li class="breadcrumb-item active">{{ Str::limit($set->title, 35) }}</li>
@endsection

@section('header-actions')
<div class="d-flex gap-2">
    <a href="{{ route('admin.questionnaires.edit', $set) }}" class="btn btn-sm btn-outline-secondary">
        <i class="bi bi-pencil me-1"></i> Edit
    </a>
    @if($set->status === 'draft')
    <form method="POST" action="{{ route('admin.questionnaires.publish', $set) }}">
        @csrf
        <button class="btn btn-sm btn-success" onclick="return confirm('Terbitkan set soalselidik ini?')">
            <i class="bi bi-send me-1"></i> Terbitkan
        </button>
    </form>
    @elseif($set->status === 'published')
    <form method="POST" action="{{ route('admin.questionnaires.archive', $set) }}">
        @csrf
        <button class="btn btn-sm btn-outline-secondary" onclick="return confirm('Arkibkan set soalselidik ini?')">
            <i class="bi bi-archive me-1"></i> Arkib
        </button>
    </form>
    @endif
</div>
@endsection

@push('styles')
<style>
.tajuk-block { border-left: 3px solid #6c757d; }
.tajuk-header { background: #f8f9fa; }
.children-list { border-top: 1px solid #dee2e6; }
.children-list .list-group-item { background: #fff; }
.children-list .list-group-item:last-child { border-bottom: 0; }
.drag-handle { cursor: grab; color: #adb5bd; }
.drag-handle:active { cursor: grabbing; }
.sortable-ghost { opacity: .4; background: #e9f0ff !important; }
</style>
@endpush

@section('content')

<div class="row g-4">
    {{-- Left: Questions --}}
    <div class="col-md-8">

        @if($set->status === 'draft')
        <div class="alert alert-warning mb-3 small">
            <i class="bi bi-exclamation-triangle me-2"></i>
            Set ini masih dalam status <strong>Draf</strong>. Terbitkan setelah siap untuk dilampirkan ke program.
        </div>
        @elseif($set->status === 'archived')
        <div class="alert alert-secondary mb-3 small">
            <i class="bi bi-archive me-2"></i>
            Set ini telah <strong>diarkibkan</strong> dan tidak boleh dilampirkan ke program baru.
        </div>
        @endif

        {{-- Question List --}}
        <div class="card border-0 shadow-sm mb-4">
            <div class="card-header bg-white d-flex justify-content-between align-items-center py-3">
                <h6 class="mb-0 fw-semibold">
                    <i class="bi bi-list-ul me-2 text-primary"></i>Senarai Soalan
                    <span class="badge bg-secondary ms-2">{{ $totalCount }}</span>
                </h6>
                <small class="text-muted"><i class="bi bi-grip-vertical me-1"></i>Seret untuk susun semula</small>
            </div>

            @if($totalCount === 0)
            <div class="card-body text-center py-5 text-muted">
                <i class="bi bi-question-circle d-block fs-1 mb-3 opacity-25"></i>
                Belum ada soalan. Tambah soalan menggunakan borang di sebelah kanan.
            </div>
            @else
            <ul class="list-group list-group-flush" id="questionList">
                @foreach($topLevel as $q)

                @if($q->question_type === 'tajuk')
                {{-- ── TAJUK BLOCK ── --}}
                <li class="list-group-item p-0 tajuk-block" data-id="{{ $q->id }}">
                    {{-- Tajuk header row --}}
                    <div class="tajuk-header d-flex align-items-center gap-2 px-3 py-2">
                        <i class="bi bi-grip-vertical drag-handle drag-handle-top fs-5"></i>
                        <span class="badge bg-dark small">Tajuk</span>
                        <div class="flex-grow-1 fw-semibold">{{ $q->question_text }}</div>
                        @if($q->rating_labels)
                        <div class="small text-muted text-nowrap d-none d-md-block">
                            @php $labels = array_filter($q->rating_labels); @endphp
                            @if(!empty($labels))
                                <i class="bi bi-tag me-1"></i>{{ implode(' · ', $labels) }}
                            @endif
                        </div>
                        @endif
                        <div class="d-flex gap-1 flex-shrink-0">
                            <button class="btn btn-sm btn-outline-secondary"
                                    onclick="editQuestion({{ $q->id }}, @json($q->question_text), 'tajuk', false, [], null, @json($q->rating_labels ?? []))">
                                <i class="bi bi-pencil"></i>
                            </button>
                            <form method="POST" action="{{ route('admin.questions.destroy', $q) }}"
                                  onsubmit="return confirm('Padam bahagian '{{ addslashes($q->question_text) }}' dan semua soalan di dalamnya?')">
                                @csrf @method('DELETE')
                                <button class="btn btn-sm btn-outline-danger"><i class="bi bi-trash"></i></button>
                            </form>
                        </div>
                    </div>
                    {{-- Rating labels pills --}}
                    @if($q->rating_labels && array_filter($q->rating_labels))
                    <div class="px-3 py-1 bg-light border-bottom d-flex gap-2 flex-wrap d-md-none">
                        @foreach(array_filter($q->rating_labels) as $val => $lbl)
                        <span class="badge bg-light text-dark border small">{{ $val }}: {{ $lbl }}</span>
                        @endforeach
                    </div>
                    @endif
                    {{-- Children list --}}
                    <ul class="children-list list-group list-group-flush" data-parent-id="{{ $q->id }}">
                        @foreach($q->children as $child)
                        <li class="list-group-item d-flex align-items-start gap-2 py-2 ps-4" data-id="{{ $child->id }}">
                            <i class="bi bi-grip-vertical drag-handle drag-handle-child fs-5 mt-1"></i>
                            <div class="flex-grow-1">
                                <div class="d-flex align-items-center gap-2 mb-1">
                                    <span class="badge bg-light text-dark border small">{{ $loop->iteration }}</span>
                                    <span class="badge bg-primary bg-opacity-10 text-primary small">Rating 1–5</span>
                                    @if($child->is_required)
                                    <span class="badge bg-danger bg-opacity-10 text-danger small">Wajib</span>
                                    @endif
                                </div>
                                <div class="small">{{ $child->question_text }}</div>
                            </div>
                            <div class="d-flex gap-1 flex-shrink-0">
                                <button class="btn btn-sm btn-outline-secondary"
                                        onclick="editQuestion({{ $child->id }}, @json($child->question_text), 'rating', {{ $child->is_required ? 'true' : 'false' }}, [], {{ $child->parent_id ?? 'null' }}, [])">
                                    <i class="bi bi-pencil"></i>
                                </button>
                                <form method="POST" action="{{ route('admin.questions.destroy', $child) }}"
                                      onsubmit="return confirm('Padam soalan ini?')">
                                    @csrf @method('DELETE')
                                    <button class="btn btn-sm btn-outline-danger"><i class="bi bi-trash"></i></button>
                                </form>
                            </div>
                        </li>
                        @endforeach
                        @if($q->children->isEmpty())
                        <li class="list-group-item text-muted small text-center py-2 fst-italic ps-4">
                            <i class="bi bi-arrow-down-short me-1"></i>Tiada soalan dalam bahagian ini
                        </li>
                        @endif
                    </ul>
                </li>

                @else
                {{-- ── STANDALONE QUESTION ── --}}
                <li class="list-group-item py-3" data-id="{{ $q->id }}">
                    <div class="d-flex justify-content-between align-items-start gap-2">
                        <div class="d-flex align-items-start gap-2 flex-grow-1">
                            <i class="bi bi-grip-vertical drag-handle drag-handle-top fs-5 mt-1"></i>
                            <div>
                                <div class="d-flex align-items-center gap-2 mb-1">
                                    <span class="badge bg-light text-dark border small">{{ $loop->iteration }}</span>
                                    <span class="badge bg-primary bg-opacity-10 text-primary small">
                                        {{ match($q->question_type) {
                                            'rating'          => 'Rating 1–5',
                                            'single_choice'   => 'Pilihan Tunggal',
                                            'multiple_choice' => 'Pilihan Berganda',
                                            'short_text'      => 'Teks Pendek',
                                            'long_text'       => 'Teks Panjang',
                                            default           => $q->question_type,
                                        } }}
                                    </span>
                                    @if($q->is_required)
                                    <span class="badge bg-danger bg-opacity-10 text-danger small">Wajib</span>
                                    @endif
                                </div>
                                <div class="fw-medium">{{ $q->question_text }}</div>
                                @if($q->options_json)
                                <div class="mt-1">
                                    @foreach($q->options_json as $opt)
                                    <span class="badge bg-light text-dark border me-1 small">{{ $opt }}</span>
                                    @endforeach
                                </div>
                                @endif
                            </div>
                        </div>
                        <div class="d-flex gap-1 flex-shrink-0">
                            <button class="btn btn-sm btn-outline-secondary"
                                    onclick="editQuestion({{ $q->id }}, @json($q->question_text), '{{ $q->question_type }}', {{ $q->is_required ? 'true' : 'false' }}, @json($q->options_json ?? []), null, [])">
                                <i class="bi bi-pencil"></i>
                            </button>
                            <form method="POST" action="{{ route('admin.questions.destroy', $q) }}"
                                  onsubmit="return confirm('Padam soalan ini?')">
                                @csrf @method('DELETE')
                                <button class="btn btn-sm btn-outline-danger"><i class="bi bi-trash"></i></button>
                            </form>
                        </div>
                    </div>
                </li>
                @endif

                @endforeach
            </ul>
            @endif
        </div>

        {{-- Used In Programs --}}
        @if($usedInPrograms->count())
        <div class="card border-0 shadow-sm">
            <div class="card-header bg-white py-3">
                <h6 class="mb-0 fw-semibold"><i class="bi bi-diagram-3 me-2 text-secondary"></i>Digunakan Dalam Program</h6>
            </div>
            <ul class="list-group list-group-flush">
                @foreach($usedInPrograms as $program)
                <li class="list-group-item d-flex justify-content-between align-items-center py-2">
                    <a href="{{ route('admin.programs.show', $program) }}" class="text-decoration-none small">
                        {{ $program->title }}
                    </a>
                    @if($program->pivot->is_confirmed ?? false)
                    <span class="badge bg-success">Disahkan</span>
                    @else
                    <span class="badge bg-warning text-dark">Belum Disahkan</span>
                    @endif
                </li>
                @endforeach
            </ul>
        </div>
        @endif
    </div>

    {{-- Right: Add / Edit Question Form --}}
    <div class="col-md-4">
        <div class="card border-0 shadow-sm sticky-top" style="top:80px;">
            <div class="card-header bg-white py-3">
                <h6 class="mb-0 fw-semibold" id="formTitle">
                    <i class="bi bi-plus-circle me-2 text-primary"></i>Tambah Soalan
                </h6>
            </div>
            <div class="card-body">

                <form method="POST" id="questionForm" action="{{ route('admin.questions.store', $set) }}">
                    @csrf
                    <input type="hidden" name="_method" id="formMethod" value="POST">
                    <input type="hidden" name="_question_id" id="questionId" value="">

                    {{-- Question text --}}
                    <div class="mb-3">
                        <label class="form-label small fw-medium">Teks Soalan / Tajuk <span class="text-danger">*</span></label>
                        <textarea name="question_text" id="questionText" rows="3"
                                  class="form-control form-control-sm @error('question_text') is-invalid @enderror"
                                  placeholder="Taip soalan atau nama bahagian..."></textarea>
                        @error('question_text')<div class="invalid-feedback">{{ $message }}</div>@enderror
                    </div>

                    {{-- Question type --}}
                    <div class="mb-3">
                        <label class="form-label small fw-medium">Jenis <span class="text-danger">*</span></label>
                        <select name="question_type" id="questionType" class="form-select form-select-sm" onchange="onTypeChange()">
                            <option value="tajuk">Tajuk Bahagian</option>
                            <option value="rating">Rating (1–5)</option>
                            <option value="single_choice">Pilihan Tunggal</option>
                            <option value="multiple_choice">Pilihan Berganda</option>
                            <option value="short_text">Teks Pendek</option>
                            <option value="long_text">Teks Panjang</option>
                        </select>
                    </div>

                    {{-- Required (hidden for tajuk) --}}
                    <div class="mb-3 form-check d-none" id="requiredSection">
                        <input type="checkbox" name="is_required" id="isRequired"
                               class="form-check-input" value="1" checked>
                        <label class="form-check-label small" for="isRequired">Wajib dijawab</label>
                    </div>

                    {{-- Parent selector (rating only) --}}
                    <div id="parentSection" class="mb-3 d-none">
                        <label class="form-label small fw-medium">Bahagian (Tajuk) <span class="text-danger">*</span></label>
                        <select name="parent_id" id="parentId" class="form-select form-select-sm">
                            <option value="">— Pilih Tajuk —</option>
                        </select>
                        @error('parent_id')
                        <div class="text-danger small mt-1">{{ $message }}</div>
                        @enderror
                    </div>

                    {{-- Rating labels (tajuk only) --}}
                    <div id="ratingLabelsSection" class="mb-3">
                        <label class="form-label small fw-medium">Label Skala Rating</label>
                        <div class="d-flex flex-column gap-1">
                            @for ($i = 1; $i <= 5; $i++)
                            <div class="input-group input-group-sm">
                                <span class="input-group-text fw-bold" style="width:32px;justify-content:center;">{{ $i }}</span>
                                <input type="text" name="rating_labels[{{ $i }}]" id="ratingLabel{{ $i }}"
                                       class="form-control"
                                       placeholder="{{ $i === 1 ? 'cth: Sangat Tidak Setuju' : ($i === 5 ? 'cth: Sangat Setuju' : '') }}">
                            </div>
                            @endfor
                        </div>
                        <div class="form-text">Kosongkan jika tiada label untuk nilai tersebut.</div>
                    </div>

                    {{-- Options (choice types) --}}
                    <div id="optionsSection" class="mb-3 d-none">
                        <label class="form-label small fw-medium">Pilihan Jawapan</label>
                        <div id="optionsList">
                            <div class="input-group input-group-sm mb-2">
                                <input type="text" name="options[]" class="form-control" placeholder="Pilihan 1">
                                <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>
                            </div>
                            <div class="input-group input-group-sm mb-2">
                                <input type="text" name="options[]" class="form-control" placeholder="Pilihan 2">
                                <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>
                            </div>
                        </div>
                        <button type="button" class="btn btn-sm btn-outline-secondary w-100" onclick="addOption()">
                            <i class="bi bi-plus me-1"></i> Tambah Pilihan
                        </button>
                        @error('options')
                        <div class="text-danger small mt-1">{{ $message }}</div>
                        @enderror
                    </div>

                    <div class="d-flex gap-2">
                        <button type="submit" class="btn btn-primary btn-sm w-100">
                            <i class="bi bi-check-lg me-1"></i> <span id="submitLabel">Tambah</span>
                        </button>
                        <button type="button" class="btn btn-outline-secondary btn-sm" id="cancelEdit"
                                style="display:none;" onclick="resetForm()">
                            Batal
                        </button>
                    </div>
                </form>

            </div>
        </div>
    </div>
</div>

@endsection

@push('scripts')
<script src="https://cdn.jsdelivr.net/npm/sortablejs@1.15.3/Sortable.min.js"></script>
<script>
const setId      = {{ $set->id }};
const storeUrl   = "{{ route('admin.questions.store', $set) }}";
const updateBase = "{{ url('admin/questions') }}/";
const reorderUrl = "{{ route('admin.questions.reorder') }}";
const csrfToken  = document.querySelector('meta[name="csrf-token"]').content;

// Tajuk questions available as parents for rating questions
const tajukList  = @json($topLevel->where('question_type', 'tajuk')->map(fn($q) => ['id' => $q->id, 'text' => $q->question_text])->values());

// ── UI helpers ──────────────────────────────────────────────────────────────

function populateParentDropdown(selectedId) {
    const sel = document.getElementById('parentId');
    sel.innerHTML = '<option value="">— Pilih Tajuk —</option>';
    tajukList.forEach(function(t) {
        const opt = document.createElement('option');
        opt.value = t.id;
        opt.textContent = t.text;
        if (selectedId && t.id == selectedId) opt.selected = true;
        sel.appendChild(opt);
    });
}

function onTypeChange() {
    const type    = document.getElementById('questionType').value;
    const isTajuk = type === 'tajuk';
    const isRating = type === 'rating';
    const isChoice = ['single_choice', 'multiple_choice'].includes(type);

    document.getElementById('requiredSection').classList.toggle('d-none', isTajuk);
    document.getElementById('ratingLabelsSection').classList.toggle('d-none', !isTajuk);
    document.getElementById('parentSection').classList.toggle('d-none', !isRating);
    document.getElementById('optionsSection').classList.toggle('d-none', !isChoice);

    if (isRating) populateParentDropdown(null);
}

function addOption() {
    const list  = document.getElementById('optionsList');
    const count = list.querySelectorAll('input').length + 1;
    const div   = document.createElement('div');
    div.className = 'input-group input-group-sm mb-2';
    div.innerHTML = `<input type="text" name="options[]" class="form-control" placeholder="Pilihan ${count}">
                     <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>`;
    list.appendChild(div);
}

function removeOption(btn) {
    const list = document.getElementById('optionsList');
    if (list.querySelectorAll('.input-group').length > 1) {
        btn.closest('.input-group').remove();
    }
}

function editQuestion(id, text, type, required, options, parentId, ratingLabels) {
    document.getElementById('formTitle').innerHTML = '<i class="bi bi-pencil me-2 text-warning"></i>Edit Soalan';
    document.getElementById('submitLabel').textContent = 'Kemaskini';
    document.getElementById('cancelEdit').style.display = '';
    document.getElementById('questionId').value = id;
    document.getElementById('questionText').value = text;
    document.getElementById('questionType').value = type;
    document.getElementById('isRequired').checked = required;

    const form = document.getElementById('questionForm');
    form.action = updateBase + id;
    document.getElementById('formMethod').value = 'PUT';

    onTypeChange(); // show/hide sections

    // Set parent if rating
    if (type === 'rating' && parentId) {
        populateParentDropdown(parentId);
    }

    // Set rating labels if tajuk
    if (type === 'tajuk') {
        for (let i = 1; i <= 5; i++) {
            const el = document.getElementById('ratingLabel' + i);
            if (el) el.value = (ratingLabels && (ratingLabels[i] || ratingLabels[String(i)])) || '';
        }
    }

    // Options list
    const list = document.getElementById('optionsList');
    list.innerHTML = '';
    if (options && options.length) {
        options.forEach(function(opt, i) {
            const div = document.createElement('div');
            div.className = 'input-group input-group-sm mb-2';
            div.innerHTML = `<input type="text" name="options[]" class="form-control" value="${opt}" placeholder="Pilihan ${i+1}">
                             <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>`;
            list.appendChild(div);
        });
    } else {
        // Restore default empty options for choice types
        list.innerHTML = `<div class="input-group input-group-sm mb-2">
            <input type="text" name="options[]" class="form-control" placeholder="Pilihan 1">
            <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>
        </div>
        <div class="input-group input-group-sm mb-2">
            <input type="text" name="options[]" class="form-control" placeholder="Pilihan 2">
            <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>
        </div>`;
    }

    form.scrollIntoView({ behavior: 'smooth' });
}

function resetForm() {
    document.getElementById('formTitle').innerHTML = '<i class="bi bi-plus-circle me-2 text-primary"></i>Tambah Soalan';
    document.getElementById('submitLabel').textContent = 'Tambah';
    document.getElementById('cancelEdit').style.display = 'none';
    document.getElementById('questionForm').reset();
    document.getElementById('questionForm').action = storeUrl;
    document.getElementById('formMethod').value = 'POST';
    document.getElementById('questionId').value = '';
    // Clear rating labels
    for (let i = 1; i <= 5; i++) {
        const el = document.getElementById('ratingLabel' + i);
        if (el) el.value = '';
    }
    document.getElementById('parentId').value = '';
    onTypeChange();
    document.getElementById('optionsList').innerHTML = `
        <div class="input-group input-group-sm mb-2">
            <input type="text" name="options[]" class="form-control" placeholder="Pilihan 1">
            <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>
        </div>
        <div class="input-group input-group-sm mb-2">
            <input type="text" name="options[]" class="form-control" placeholder="Pilihan 2">
            <button type="button" class="btn btn-outline-danger" onclick="removeOption(this)"><i class="bi bi-x"></i></button>
        </div>`;
}

// ── Drag & Drop ──────────────────────────────────────────────────────────────

function sendReorder(order, parentId) {
    fetch(reorderUrl, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', 'X-CSRF-TOKEN': csrfToken },
        body: JSON.stringify({ order: order, parent_id: parentId }),
    });
}

document.addEventListener('DOMContentLoaded', function () {
    // Init: show sections for default type (tajuk)
    onTypeChange();

    // Top-level sortable — sorts tajuk blocks + standalone questions
    const topList = document.getElementById('questionList');
    if (topList) {
        Sortable.create(topList, {
            animation:   150,
            handle:      '.drag-handle-top',
            ghostClass:  'sortable-ghost',
            onEnd: function() {
                const order = [...topList.querySelectorAll(':scope > [data-id]')].map(el => +el.dataset.id);
                sendReorder(order, null);
            },
        });
    }

    // Per-tajuk sortable — sorts rating children within a group
    document.querySelectorAll('.children-list').forEach(function(list) {
        Sortable.create(list, {
            animation:   150,
            handle:      '.drag-handle-child',
            ghostClass:  'sortable-ghost',
            onEnd: function() {
                const parentId = +list.dataset.parentId;
                const order    = [...list.querySelectorAll(':scope > [data-id]')].map(el => +el.dataset.id);
                sendReorder(order, parentId);
            },
        });
    });
});
</script>
@endpush