@extends('layouts.admin')

@section('title', 'Dispute Chat — Admin')

@push('styles')
<style>
    .chat-page {
        display: flex;
        flex-direction: column;
        height: calc(100vh - var(--topbar-height) - 4rem);
        max-height: 750px;
    }

    .chat-page-header {
        display: flex;
        align-items: center;
        gap: 1rem;
        padding: 1rem 1.5rem;
        background: var(--bg-card);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        border-bottom: none;
    }

    .chat-page-header .back-btn {
        background: var(--bg-hover);
        border: 1px solid var(--border);
        color: var(--text-secondary);
        width: 36px;
        height: 36px;
        border-radius: var(--radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        transition: all var(--transition);
    }

    .chat-page-header .back-btn:hover { color: var(--accent); border-color: var(--accent); }

    .chat-page-header-info { flex: 1; }
    .chat-page-header-info h2 { font-size: 1rem; font-weight: 600; margin-bottom: 0.125rem; }

    .chat-page-header-info .chat-meta {
        font-size: 0.8rem;
        color: var(--text-muted);
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .badge-dispute {
        display: inline-flex;
        align-items: center;
        gap: 0.25rem;
        padding: 0.2rem 0.5rem;
        border-radius: 20px;
        font-size: 0.65rem;
        font-weight: 600;
        background: rgba(255, 71, 87, 0.15);
        color: #ff4757;
    }

    .online-dot {
        width: 8px; height: 8px;
        border-radius: 50%;
        background: var(--success);
        display: inline-block;
        animation: pulse-dot 2s infinite;
    }

    @keyframes pulse-dot {
        0%, 100% { opacity: 1; }
        50% { opacity: 0.4; }
    }

    .dispute-info-bar {
        padding: 0.65rem 1.5rem;
        background: rgba(255, 165, 2, 0.08);
        border-left: 1px solid var(--border);
        border-right: 1px solid var(--border);
        font-size: 0.78rem;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .dispute-info-bar i { color: var(--warning); }

    .chat-messages-container {
        flex: 1;
        overflow-y: auto;
        padding: 1.5rem;
        background: var(--bg-card);
        border-left: 1px solid var(--border);
        border-right: 1px solid var(--border);
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
        scroll-behavior: smooth;
    }

    .chat-bubble {
        max-width: 70%;
        padding: 0.75rem 1rem;
        border-radius: var(--radius-md);
        font-size: 0.875rem;
        line-height: 1.6;
        word-wrap: break-word;
        animation: bubble-in 0.2s ease-out;
    }

    @keyframes bubble-in {
        from { opacity: 0; transform: translateY(8px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .chat-bubble.sent {
        background: var(--warning);
        color: #fff;
        align-self: flex-end;
        border-bottom-right-radius: 4px;
    }

    .chat-bubble.received {
        background: var(--bg-secondary);
        border: 1px solid var(--border);
        color: var(--text-primary);
        align-self: flex-start;
        border-bottom-left-radius: 4px;
    }

    .chat-bubble.system {
        background: var(--warning-light);
        color: var(--warning);
        align-self: center;
        text-align: center;
        font-size: 0.8rem;
        max-width: 85%;
        border-radius: 20px;
        padding: 0.5rem 1rem;
    }

    .chat-bubble .sender-name {
        font-size: 0.7rem;
        font-weight: 600;
        color: var(--accent);
        margin-bottom: 0.2rem;
    }

    .chat-bubble .sender-role {
        font-size: 0.6rem;
        padding: 0.1rem 0.35rem;
        border-radius: 10px;
        margin-left: 0.25rem;
    }

    .role-buyer { background: rgba(16, 191, 255, 0.15); color: #10BFFF; }
    .role-seller { background: rgba(0, 212, 170, 0.15); color: #00d4aa; }

    .chat-bubble-meta { font-size: 0.65rem; margin-top: 0.3rem; opacity: 0.7; }
    .chat-bubble.sent .chat-bubble-meta { text-align: right; }

    .chat-bubble .attachment {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        margin-top: 0.5rem;
        padding: 0.4rem 0.65rem;
        background: rgba(255, 255, 255, 0.1);
        border-radius: var(--radius-sm);
        font-size: 0.8rem;
    }

    .empty-chat {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        gap: 0.75rem;
    }

    .empty-chat i { font-size: 2.5rem; opacity: 0.4; }

    .typing-indicator {
        display: none;
        align-self: flex-start;
        padding: 0.6rem 1rem;
        background: var(--bg-secondary);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        border-bottom-left-radius: 4px;
        font-size: 0.8rem;
        color: var(--text-muted);
        align-items: center;
        gap: 0.5rem;
    }

    .typing-indicator.visible { display: flex; }

    .typing-dots { display: flex; gap: 3px; align-items: center; }

    .typing-dots span {
        width: 6px; height: 6px;
        border-radius: 50%;
        background: var(--text-muted);
        animation: typing-bounce 1.4s infinite ease-in-out;
    }

    .typing-dots span:nth-child(1) { animation-delay: 0s; }
    .typing-dots span:nth-child(2) { animation-delay: 0.2s; }
    .typing-dots span:nth-child(3) { animation-delay: 0.4s; }

    @keyframes typing-bounce {
        0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
        30% { transform: translateY(-4px); opacity: 1; }
    }

    .chat-input-area {
        display: flex;
        gap: 0.5rem;
        padding: 1rem 1.5rem;
        background: var(--bg-secondary);
        border: 1px solid var(--border);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        border-top: none;
        align-items: flex-end;
    }

    .chat-input-wrap { flex: 1; }

    .chat-input-wrap input[type="text"] {
        width: 100%;
        padding: 0.75rem 1rem;
        background: var(--bg-primary);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        color: var(--text-primary);
        font-family: inherit;
        font-size: 0.9rem;
        outline: none;
    }

    .chat-input-wrap input:focus { border-color: var(--accent); }
    .chat-input-wrap input::placeholder { color: var(--text-muted); }

    .send-btn { padding: 0.75rem 1.25rem; }
    .send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

    @media (max-width: 640px) {
        .chat-page { height: calc(100vh - var(--topbar-height) - 2.5rem); max-height: none; }
        .chat-bubble { max-width: 85%; }
    }
</style>
@endpush

@section('content')
    <div class="chat-page">
        <div class="chat-page-header">
            <a href="{{ route('admin.escrow.disputes') }}" class="back-btn"><i class="fas fa-arrow-left"></i></a>
            <div class="chat-page-header-info">
                <h2><i class="fas fa-gavel" style="color: var(--warning); font-size: 0.9rem; margin-right: 0.3rem;"></i> Dispute #{{ $dispute->id }} — Admin Chat</h2>
                <div class="chat-meta">
                    <span>{{ $transaction->title ?? 'Transaction' }}</span>
                    <span class="badge-dispute"><i class="fas fa-exclamation-triangle" style="font-size: 0.55rem;"></i> {{ ucfirst($dispute->status) }}</span>
                    <span class="online-dot"></span>
                </div>
            </div>
        </div>

        <div class="dispute-info-bar">
            <i class="fas fa-shield-halved"></i>
            <span>
                <strong>{{ $transaction->buyer->name ?? 'Buyer' }}</strong> (Buyer)
                &bull;
                <strong>{{ $transaction->seller->name ?? 'Seller' }}</strong> (Seller)
                &bull;
                &#8358;{{ number_format($transaction->amount, 2) }}
                &bull;
                Reason: {{ Str::limit($dispute->reason, 60) }}
            </span>
        </div>

        <div class="chat-messages-container" id="chatMessages">
            @forelse($messages ?? [] as $message)
                @if($message->type === 'system')
                    <div class="chat-bubble system" data-msg-id="{{ $message->id }}">
                        <i class="fas fa-info-circle"></i> {{ $message->content }}
                        <div class="chat-bubble-meta">{{ $message->created_at->format('M d, h:i A') }}</div>
                    </div>
                @elseif($message->sender_id === auth()->id())
                    <div class="chat-bubble sent" data-msg-id="{{ $message->id }}">
                        {{ $message->content }}
                        @if($message->file_url)
                            <div class="attachment">
                                <i class="fas fa-paperclip"></i>
                                <a href="{{ asset('storage/' . $message->file_url) }}" target="_blank" style="color: inherit; text-decoration: underline;">{{ basename($message->file_url) }}</a>
                            </div>
                        @endif
                        <div class="chat-bubble-meta">{{ $message->created_at->format('h:i A') }} (You — Admin)</div>
                    </div>
                @else
                    @php
                        $isBuyer = $message->sender_id === $transaction->buyer_id;
                        $role = $isBuyer ? 'Buyer' : 'Seller';
                        $roleClass = $isBuyer ? 'role-buyer' : 'role-seller';
                    @endphp
                    <div class="chat-bubble received" data-msg-id="{{ $message->id }}">
                        <div class="sender-name">
                            {{ $message->sender->name ?? 'User' }}
                            <span class="sender-role {{ $roleClass }}">{{ $role }}</span>
                        </div>
                        {{ $message->content }}
                        @if($message->file_url)
                            <div class="attachment">
                                <i class="fas fa-paperclip"></i>
                                <a href="{{ asset('storage/' . $message->file_url) }}" target="_blank" style="color: var(--accent); text-decoration: underline;">{{ basename($message->file_url) }}</a>
                            </div>
                        @endif
                        <div class="chat-bubble-meta">{{ $message->created_at->format('h:i A') }}</div>
                    </div>
                @endif
            @empty
                <div class="empty-chat" id="emptyChat">
                    <i class="fas fa-gavel"></i>
                    <p>No messages in this dispute yet.</p>
                </div>
            @endforelse

            <div class="typing-indicator" id="typingIndicator">
                <div class="typing-dots"><span></span><span></span><span></span></div>
                <span id="typingText">typing...</span>
            </div>
        </div>

        <div class="chat-input-area">
            <div class="chat-input-wrap">
                <input type="text" placeholder="Type as admin..." autocomplete="off" id="chatInput">
            </div>
            <button type="button" class="btn btn-primary send-btn" id="sendBtn" onclick="sendMessage()">
                <i class="fas fa-paper-plane"></i>
            </button>
        </div>
    </div>
@endsection

@push('scripts')
<script>
(function() {
    const CURRENT_USER_ID = @json(auth()->id());
    const BUYER_ID = @json($transaction->buyer_id);
    const CSRF_TOKEN = document.querySelector('meta[name="csrf-token"]').content;
    const POLL_URL = @json(route('admin.escrow.disputes.chat.poll', $dispute->id));
    const SEND_URL = @json(route('admin.escrow.disputes.chat.store', $dispute->id));
    const TYPING_URL = @json(route('admin.escrow.disputes.chat.typing', $dispute->id));

    const chatContainer = document.getElementById('chatMessages');
    const chatInput = document.getElementById('chatInput');
    const sendBtn = document.getElementById('sendBtn');
    const typingIndicator = document.getElementById('typingIndicator');
    const typingText = document.getElementById('typingText');
    const emptyChat = document.getElementById('emptyChat');

    let lastMessageId = 0;
    let typingTimeout = null;
    let isTyping = false;
    let pollTimer = null;
    let sending = false;

    function initLastMessageId() {
        const bubbles = chatContainer.querySelectorAll('[data-msg-id]');
        if (bubbles.length > 0) lastMessageId = parseInt(bubbles[bubbles.length - 1].dataset.msgId) || 0;
    }

    function scrollToBottom() { chatContainer.scrollTop = chatContainer.scrollHeight; }

    function escapeHtml(text) {
        const d = document.createElement('div');
        d.textContent = text;
        return d.innerHTML;
    }

    function createBubble(msg) {
        const div = document.createElement('div');
        div.dataset.msgId = msg.id;

        if (msg.type === 'system') {
            div.className = 'chat-bubble system';
            div.innerHTML = '<i class="fas fa-info-circle"></i> ' + escapeHtml(msg.content) +
                '<div class="chat-bubble-meta">' + msg.time + '</div>';
        } else if (msg.sender_id === CURRENT_USER_ID) {
            div.className = 'chat-bubble sent';
            let html = escapeHtml(msg.content);
            if (msg.file_url) {
                html += '<div class="attachment"><i class="fas fa-paperclip"></i>' +
                    '<a href="' + msg.file_url + '" target="_blank" style="color:inherit;text-decoration:underline;">' +
                    escapeHtml(msg.file_name || '') + '</a></div>';
            }
            html += '<div class="chat-bubble-meta">' + msg.time + ' (You — Admin)</div>';
            div.innerHTML = html;
        } else {
            div.className = 'chat-bubble received';
            const isBuyer = msg.sender_id === BUYER_ID;
            const role = isBuyer ? 'Buyer' : 'Seller';
            const roleClass = isBuyer ? 'role-buyer' : 'role-seller';
            let html = '<div class="sender-name">' + escapeHtml(msg.sender_name) +
                ' <span class="sender-role ' + roleClass + '">' + role + '</span></div>';
            html += escapeHtml(msg.content);
            if (msg.file_url) {
                html += '<div class="attachment"><i class="fas fa-paperclip"></i>' +
                    '<a href="' + msg.file_url + '" target="_blank" style="color:var(--accent);text-decoration:underline;">' +
                    escapeHtml(msg.file_name || '') + '</a></div>';
            }
            html += '<div class="chat-bubble-meta">' + msg.time + '</div>';
            div.innerHTML = html;
        }
        return div;
    }

    async function poll() {
        try {
            const res = await fetch(POLL_URL + '?after=' + lastMessageId, {
                headers: { 'Accept': 'application/json', 'X-Requested-With': 'XMLHttpRequest' }
            });
            if (!res.ok) return;
            const data = await res.json();

            if (data.messages && data.messages.length > 0) {
                if (emptyChat) emptyChat.remove();
                data.messages.forEach(function(msg) {
                    if (chatContainer.querySelector('[data-msg-id="' + msg.id + '"]')) return;
                    chatContainer.insertBefore(createBubble(msg), typingIndicator);
                    lastMessageId = Math.max(lastMessageId, msg.id);
                });
                scrollToBottom();
            }

            if (data.typing && data.typing.length > 0) {
                typingText.textContent = data.typing.join(', ') + ' typing...';
                typingIndicator.classList.add('visible');
                scrollToBottom();
            } else {
                typingIndicator.classList.remove('visible');
            }
        } catch (e) {}
        schedulePoll();
    }

    function schedulePoll() {
        if (pollTimer) clearTimeout(pollTimer);
        pollTimer = setTimeout(poll, 2000);
    }

    window.sendMessage = async function() {
        const content = chatInput.value.trim();
        if (!content || sending) return;
        sending = true;
        sendBtn.disabled = true;

        const formData = new FormData();
        formData.append('content', content);
        formData.append('_token', CSRF_TOKEN);

        try {
            const res = await fetch(SEND_URL, {
                method: 'POST',
                headers: { 'Accept': 'application/json', 'X-Requested-With': 'XMLHttpRequest' },
                body: formData,
            });
            const data = await res.json();
            if (data.success && data.message) {
                if (emptyChat) emptyChat.remove();
                chatContainer.insertBefore(createBubble(data.message), typingIndicator);
                lastMessageId = Math.max(lastMessageId, data.message.id);
                scrollToBottom();
                chatInput.value = '';
                stopTyping();
            }
        } catch (e) { console.error('Send failed:', e); }

        sending = false;
        sendBtn.disabled = false;
        chatInput.focus();
    };

    async function sendTypingStatus(typing) {
        try {
            await fetch(TYPING_URL, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json', 'Accept': 'application/json', 'X-CSRF-TOKEN': CSRF_TOKEN, 'X-Requested-With': 'XMLHttpRequest' },
                body: JSON.stringify({ typing: typing }),
            });
        } catch (e) {}
    }

    function startTyping() {
        if (!isTyping) { isTyping = true; sendTypingStatus(true); }
        if (typingTimeout) clearTimeout(typingTimeout);
        typingTimeout = setTimeout(stopTyping, 4000);
    }

    function stopTyping() {
        if (isTyping) { isTyping = false; sendTypingStatus(false); }
        if (typingTimeout) { clearTimeout(typingTimeout); typingTimeout = null; }
    }

    chatInput.addEventListener('keydown', function(e) {
        if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); sendMessage(); }
    });

    chatInput.addEventListener('input', function() {
        this.value.trim().length > 0 ? startTyping() : stopTyping();
    });

    initLastMessageId();
    scrollToBottom();
    schedulePoll();
})();
</script>
@endpush