@extends('layouts.shop')

@section('meta_title', 'Чаты с клиентами')

@section('content')
    @include('partials.breadcrumbs', [
        'items' => [
            ['label' => 'Админка', 'url' => route('admin.dashboard')],
            ['label' => 'Чаты', 'url' => null],
        ],
    ])

    <section class="pc-section">
        <div class="pc-section-title">
            <h2>Чаты с клиентами</h2>
            <p>Отвечайте клиентам прямо из админки.</p>
        </div>

        @if ($conversations->isEmpty())
            <div class="pc-card">
                <p>Пока нет сообщений от клиентов.</p>
            </div>
        @else
            <div class="pc-admin-chat-layout">
                <aside class="pc-card pc-admin-chat-list">
                    @foreach ($conversations as $conversation)
                        @php
                            $isActive = $selectedConversation && $selectedConversation->id === $conversation->id;
                            $subtitle = $conversation->user?->email ?: ('Токен: ' . \Illuminate\Support\Str::limit($conversation->visitor_token, 14, '...'));
                            $preview = $conversation->latestMessage?->body ? \Illuminate\Support\Str::limit($conversation->latestMessage->body, 80) : 'Нет сообщений';
                        @endphp
                        <a class="pc-admin-chat-item {{ $isActive ? 'is-active' : '' }}" href="{{ route('admin.chats.index', ['conversation' => $conversation->id]) }}">
                            <div class="pc-admin-chat-item-top">
                                <strong>{{ $conversation->display_name }}</strong>
                                @if ($conversation->unread_count > 0)
                                    <span class="pc-admin-chat-badge">{{ $conversation->unread_count }}</span>
                                @endif
                            </div>
                            <span class="pc-muted">{{ $subtitle }}</span>
                            @if ($conversation->status === \App\Models\ChatConversation::STATUS_CLOSED)
                                <span class="pc-muted">Чат закрыт</span>
                            @endif
                            <span class="pc-muted">{{ $preview }}</span>
                        </a>
                    @endforeach
                </aside>

                <div class="pc-card pc-admin-chat-panel">
                    @if ($selectedConversation)
                        @php
                            $isClosed = $selectedConversation->status === \App\Models\ChatConversation::STATUS_CLOSED;
                        @endphp
                        <div
                            id="pc-admin-chat"
                            data-fetch-url="{{ route('admin.chats.messages', $selectedConversation) }}"
                            data-send-url="{{ route('admin.chats.messages.store', $selectedConversation) }}"
                            data-csrf="{{ csrf_token() }}"
                        >
                            <div class="pc-admin-chat-head">
                                <div>
                                    <h3>{{ $selectedConversation->display_name }}</h3>
                                    <p class="pc-muted">{{ $selectedConversation->user?->email ?: 'Гость' }}</p>
                                    <p class="pc-muted">{{ $isClosed ? 'Чат закрыт' : 'Чат открыт' }}</p>
                                </div>
                                <div class="pc-admin-chat-actions">
                                    <form method="post" action="{{ route('admin.chats.status', $selectedConversation) }}">
                                        @csrf
                                        @method('patch')
                                        <input type="hidden" name="status" value="{{ $isClosed ? \App\Models\ChatConversation::STATUS_OPEN : \App\Models\ChatConversation::STATUS_CLOSED }}">
                                        <button class="pc-btn ghost" type="submit">{{ $isClosed ? 'Открыть чат' : 'Закрыть чат' }}</button>
                                    </form>
                                    <form method="post" action="{{ route('admin.chats.destroy', $selectedConversation) }}" onsubmit="return confirm('Удалить чат и все сообщения?')">
                                        @csrf
                                        @method('delete')
                                        <button class="pc-btn ghost" type="submit">Удалить чат</button>
                                    </form>
                                </div>
                            </div>

                            <div class="pc-admin-chat-messages" id="pc-admin-chat-messages"></div>

                            <form class="pc-admin-chat-form" id="pc-admin-chat-form">
                                <textarea name="message" rows="3" maxlength="2000" placeholder="{{ $isClosed ? 'Чат закрыт. Сначала откройте его.' : 'Введите ответ клиенту...' }}" required @disabled($isClosed)></textarea>
                                <button class="pc-btn primary" type="submit" @disabled($isClosed)>{{ $isClosed ? 'Чат закрыт' : 'Отправить' }}</button>
                            </form>
                        </div>
                    @else
                        <p>Выберите чат слева.</p>
                    @endif
                </div>
            </div>

            <div class="pc-pagination">
                {{ $conversations->links() }}
            </div>
        @endif
    </section>
@endsection

@if ($selectedConversation)
    @push('scripts')
        <script>
            (() => {
                const root = document.getElementById('pc-admin-chat');
                const list = document.getElementById('pc-admin-chat-messages');
                const form = document.getElementById('pc-admin-chat-form');
                if (!root || !list || !form) {
                    return;
                }

                const fetchUrl = root.dataset.fetchUrl;
                const sendUrl = root.dataset.sendUrl;
                const csrf = root.dataset.csrf;
                const initialMessages = @json($initialMessages);

                const renderMessages = (messages) => {
                    if (!Array.isArray(messages)) {
                        return;
                    }

                    list.innerHTML = '';
                    messages.forEach((message) => {
                        const item = document.createElement('div');
                        item.className = `pc-admin-chat-message ${message.sender === 'admin' ? 'is-admin' : 'is-customer'}`;

                        const bubble = document.createElement('div');
                        bubble.className = 'pc-admin-chat-bubble';
                        bubble.textContent = message.body || '';

                        const meta = document.createElement('span');
                        meta.className = 'pc-muted';
                        meta.textContent = message.time || '';

                        item.appendChild(bubble);
                        item.appendChild(meta);
                        list.appendChild(item);
                    });

                    list.scrollTop = list.scrollHeight;
                };

                const fetchMessages = async () => {
                    try {
                        const response = await fetch(fetchUrl, {
                            method: 'GET',
                            headers: {
                                'Accept': 'application/json',
                            },
                        });

                        if (!response.ok) {
                            return;
                        }

                        const payload = await response.json();
                        renderMessages(payload.messages || []);
                    } catch (error) {
                        // Ignore temporary connection issues and continue polling.
                    }
                };

                form.addEventListener('submit', async (event) => {
                    event.preventDefault();
                    const textarea = form.querySelector('textarea[name="message"]');
                    const button = form.querySelector('button[type="submit"]');
                    if (!textarea || !button) {
                        return;
                    }

                    const message = textarea.value.trim();
                    if (message === '') {
                        return;
                    }

                    button.disabled = true;

                    try {
                        const response = await fetch(sendUrl, {
                            method: 'POST',
                            headers: {
                                'Accept': 'application/json',
                                'Content-Type': 'application/json',
                                'X-CSRF-TOKEN': csrf,
                            },
                            body: JSON.stringify({ message }),
                        });

                        if (!response.ok) {
                            return;
                        }

                        textarea.value = '';
                        await fetchMessages();
                    } finally {
                        button.disabled = false;
                    }
                });

                renderMessages(initialMessages);
                fetchMessages();
                window.setInterval(fetchMessages, 4000);
            })();
        </script>
    @endpush
@endif