@extends('layouts.app')

@section('content')

<div class="container-fluid">
    <div class="card shadow mb-4">
        <div class="card-header bg-primary text-white d-flex align-items-center justify-content-between">
            <div class="d-flex align-items-center">
                <img src="{{ $user->profile_photo_url }}"
                    class="rounded-circle mr-2"
                    width="38" height="38"
                    style="object-fit:cover">
                <strong>{{ $user->name }}</strong>
            </div>
            <a href="{{ route('chat.index') }}" class="btn btn-sm btn-light shadow-sm">
                <i class="fas fa-arrow-left fa-sm"></i> Regresar
            </a>
        </div>

        <div class="card-body overflow-auto flex-grow-1 p-3" id="chat-messages">
        @foreach($messages as $msg)
            <div class="d-flex mb-2 {{ $msg->user_id === auth()->id() ? 'justify-content-end' : 'justify-content-start' }}">
                <div class="px-3 py-2 rounded {{ $msg->user_id === auth()->id() ? 'bg-primary text-white' : 'bg-light' }}"
                        style="max-width:65%">
                    @if($msg->body)
                        <div>{{ $msg->body }}</div>
                    @endif
                    @if($msg->attachment)
                        @if($msg->attachment_type === 'image')
                            <img src="{{ route('files.serve', ['path' => $msg->attachment]) }}" class="img-fluid rounded mt-1" style="max-width:240px; cursor:pointer" onclick="window.open(this.src,'_blank')">
                        @elseif($msg->attachment_type === 'audio')
                            <audio controls class="mt-1" style="max-width:250px">
                                <source src="{{ route('files.serve', ['path' => $msg->attachment]) }}">
                            </audio>
                        @elseif($msg->attachment_type === 'video')
                            <video controls class="mt-1 rounded" style="max-width:250px">
                                <source src="{{ route('files.serve', ['path' => $msg->attachment]) }}">
                            </video>
                        @else
                            <a href="{{ route('files.serve', ['path' => $msg->attachment]) }}" target="_blank" class="btn btn-sm btn-light mt-1">
                                <i class="fas fa-file"></i> Ver archivo
                            </a>
                        @endif
                    @endif
                    <div class="text-right mt-1" style="font-size:0.7rem; opacity:0.7">
                        {{ $msg->created_at->format('H:i') }}
                    </div>
                </div>
            </div>
        @endforeach
        </div>

        <div class="card-footer p-2">
            @if($isFriend)
                <form id="chat-form" enctype="multipart/form-data">
                    @csrf
                    <input type="hidden" name="receiver_id" value="{{ $user->id }}">
                    <div class="input-group">
                        <input type="text" name="body" id="chat-input"
                               class="form-control rounded-pill mr-2"
                               placeholder="Escribe un mensaje..." autocomplete="off">
                        <label class="btn btn-light mr-1 mb-0" title="Adjuntar archivo">
                            <i class="fas fa-paperclip"></i>
                            <input type="file" name="attachment" id="attachment" hidden>
                        </label>
                        <button type="submit" class="btn btn-primary rounded-pill px-4">
                            <i class="fas fa-paper-plane"></i>
                        </button>
                    </div>
                    <div id="attachment-preview" class="mt-1 text-muted small"></div>
                </form>
            @else
                <div class="text-center py-3">
                    <p class="text-muted small mb-2">
                        <i class="fas fa-lock mr-1"></i>
                        Ya no son amigos. No puedes enviar mensajes.
                    </p>
                    @if($friendship && $friendship->status === 'pending' && $friendship->sender_id === auth()->id())
                        <span class="btn btn-sm btn-outline-secondary disabled">
                            <i class="fas fa-user-clock mr-1"></i> Solicitud enviada
                        </span>
                    @elseif($friendship && $friendship->status === 'pending' && $friendship->receiver_id === auth()->id())
                        <form action="{{ route('friendships.accept', $friendship) }}" method="POST" class="d-inline">
                            @csrf
                            <button class="btn btn-sm btn-success">
                                <i class="fas fa-check mr-1"></i> Aceptar solicitud
                            </button>
                        </form>
                    @else
                        <form action="{{ route('friendships.send', $user) }}" method="POST" class="d-inline">
                            @csrf
                            <button class="btn btn-sm btn-primary">
                                <i class="fas fa-user-plus mr-1"></i> Enviar solicitud de amistad
                            </button>
                        </form>
                    @endif
                </div>
            @endif
        </div>
    </div>
</div>


@endsection

@section('scripts')

<style>
    .sticky-footer { display: none !important; }
    .card { height: calc(100vh - 160px); display: flex; flex-direction: column; }
    #chat-messages { flex: 1; overflow-y: auto; }
</style>

<script>
const receiverId = {{ $user->id }};
const authId = {{ auth()->id() }};
const storageBase = '{{ url('/files') }}';
const chatMessages = document.getElementById('chat-messages');

// scroll al fondo
function scrollBottom() {
    chatMessages.scrollTop = chatMessages.scrollHeight;
}
scrollBottom();

const MAX_ATTACHMENT_MB = 50;
const MAX_ATTACHMENT_BYTES = MAX_ATTACHMENT_MB * 1024 * 1024;

const attachmentInput = document.getElementById('attachment');
const chatForm = document.getElementById('chat-form');

if (attachmentInput) {
    attachmentInput.addEventListener('change', function() {
        const file = this.files[0];
        if (!file) return;
        if (file.size > MAX_ATTACHMENT_BYTES) {
            document.getElementById('attachment-preview').innerHTML =
                `<span class="text-danger"><i class="fas fa-exclamation-circle mr-1"></i>El archivo supera el límite de ${MAX_ATTACHMENT_MB} MB.</span>`;
            this.value = '';
            return;
        }
        document.getElementById('attachment-preview').textContent = '📎 ' + file.name;
    });
}

if (chatForm) {
    chatForm.addEventListener('submit', function(e) {
        e.preventDefault();
        const form = this;
        const fileInput = document.getElementById('attachment');
        if (fileInput && fileInput.files[0] && fileInput.files[0].size > MAX_ATTACHMENT_BYTES) {
            document.getElementById('attachment-preview').innerHTML =
                `<span class="text-danger"><i class="fas fa-exclamation-circle mr-1"></i>El archivo supera el límite de ${MAX_ATTACHMENT_MB} MB.</span>`;
            fileInput.value = '';
            return;
        }
        const data = new FormData(form);

        const socketId = (window.Echo && window.Echo.socketId) ? window.Echo.socketId() : null;
        const reqHeaders = {};
        if (socketId) reqHeaders['X-Socket-ID'] = socketId;

        axios.post('{{ route("chat.send") }}', data, { headers: reqHeaders })
        .then(response => {
            appendMessage(response.data, true);
            scrollBottom();
            form.reset();
            document.getElementById('attachment-preview').textContent = '';
            window.dispatchEvent(new CustomEvent('chat:replied', { detail: { receiverId } }));
        }).catch(error => {
            const preview = document.getElementById('attachment-preview');
            const status = error.response ? error.response.status : 0;
            if (status === 413) {
                preview.innerHTML = `<span class="text-danger"><i class="fas fa-exclamation-circle mr-1"></i>El archivo es demasiado grande (máx. 50 MB).</span>`;
            } else if (status === 422) {
                const errors = error.response.data.errors;
                const msg = errors && errors.attachment ? errors.attachment[0]
                    : (errors && errors.receiver_id ? 'Error de sesión, recarga la página.' : 'Archivo no válido.');
                preview.innerHTML = `<span class="text-danger"><i class="fas fa-exclamation-circle mr-1"></i>${msg}</span>`;
            } else {
                preview.innerHTML = `<span class="text-danger"><i class="fas fa-exclamation-circle mr-1"></i>Error al enviar. Intenta de nuevo.</span>`;
            }
        });
    });
}

function buildAttachmentHtml(msg, isMine) {
    if (!msg.attachment) return '';
    const url = storageBase + '/' + msg.attachment;
    const linkClass = isMine ? 'text-white' : 'text-dark';
    switch (msg.attachment_type) {
        case 'image':
            return `<img src="${url}" class="img-fluid rounded mt-1" style="max-width:240px; cursor:pointer"
                        onclick="window.open('${url}','_blank')">`;
        case 'video':
            return `<video controls class="mt-1 rounded" style="max-width:240px">
                        <source src="${url}">Tu navegador no soporta video.
                    </video>`;
        case 'audio':
            return `<audio controls class="mt-1" style="max-width:240px">
                        <source src="${url}">Tu navegador no soporta audio.
                    </audio>`;
        default:
            return `<a href="${url}" target="_blank" class="btn btn-sm ${isMine ? 'btn-light' : 'btn-secondary'} mt-1">
                        <i class="fas fa-file mr-1"></i>Ver archivo
                    </a>`;
    }
}

function appendMessage(msg, isMine) {
    const div = document.createElement('div');
    div.className = `d-flex mb-2 ${isMine ? 'justify-content-end' : 'justify-content-start'}`;

    const time = typeof msg.created_at === 'string' && msg.created_at.length > 5
        ? new Date(msg.created_at).toLocaleTimeString('es-MX', {hour:'2-digit', minute:'2-digit'})
        : msg.created_at;

    div.innerHTML = `
        <div class="px-3 py-2 rounded ${isMine ? 'bg-primary text-white' : 'bg-light'}" style="max-width:65%">
            ${msg.body ? `<div>${msg.body}</div>` : ''}
            ${buildAttachmentHtml(msg, isMine)}
            <div class="text-right mt-1" style="font-size:0.7rem; opacity:0.7">${time}</div>
        </div>`;
    chatMessages.appendChild(div);
}

// esperar a que Echo esté disponible
function waitForEcho(callback) {
    if (window.Echo) {
        callback();
    } else {
        setTimeout(() => waitForEcho(callback), 100);
    }
}

waitForEcho(() => {
    window.Echo.channel(`chat.${authId}`)
        .listen('MessageSent', (e) => {
            if (e.sender.id !== receiverId) return;
            appendMessage(e, false);
            scrollBottom();
        });
});
</script>
@endsection