Sistema-Educativo-Laravel/app/Http/Controllers/ChatController.php

<?php

namespace App\Http\Controllers;

use App\Events\MessageSent;
use App\Models\Message;
use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;

class ChatController extends Controller
{
    // Lista de conversaciones (amigos + historial con no-amigos)
    public function index()
    {
        $me = auth()->user();

        // IDs de usuarios con quienes hay mensajes intercambiados
        $sentTo    = Message::where('user_id', $me->id)->pluck('receiver_id');
        $receivedFrom = Message::where('receiver_id', $me->id)->pluck('user_id');
        $conversationIds = $sentTo->merge($receivedFrom)->unique()->values();

        // Amigos (con o sin historial de mensajes)
        $friendIds = collect($me->friendIds());
        $allIds    = $conversationIds->merge($friendIds)->unique()->values();

        $users = User::whereIn('id', $allIds)->orderBy('name')->get()
            ->map(function (User $user) use ($me) {
                $user->is_friend = $me->isFriendWith($user);
                return $user;
            });

        return view('chat.index', compact('users'));
    }

    // Mensajes entre yo y otro usuario
    public function show(User $user)
    {
        $me         = auth()->user();
        $isFriend   = $me->isFriendWith($user);
        $friendship = $me->friendshipWith($user);

        $messages = Message::where(function ($q) use ($user) {
                $q->where('user_id', auth()->id())
                  ->where('receiver_id', $user->id);
            })
            ->orWhere(function ($q) use ($user) {
                $q->where('user_id', $user->id)
                  ->where('receiver_id', auth()->id());
            })
            ->with('sender')
            ->orderBy('created_at', 'asc')
            ->get();

        // marcar como leídos solo si son amigos
        if ($isFriend) {
            Message::where('user_id', $user->id)
                ->where('receiver_id', $me->id)
                ->whereNull('read_at')
                ->update(['read_at' => now()]);
        }

        return view('chat.show', compact('user', 'messages', 'isFriend', 'friendship'));
    }

    // Enviar mensaje
    public function send(Request $request)
    {
        $request->validate([
            'receiver_id' => 'required|exists:users,id',
            'body'        => 'nullable|string',
            'attachment'  => 'nullable|file|max:51200',
        ]);

        $receiver = User::findOrFail($request->receiver_id);
        abort_unless(auth()->user()->isFriendWith($receiver), 403, 'No puedes enviar mensajes a esta persona.');

        $attachment = null;
        $attachmentType = null;

        if ($request->hasFile('attachment')) {
            $file = $request->file('attachment');
            $attachment = $file->store('chat', 'local');
            $mime = $file->getMimeType();

            if (str_starts_with($mime, 'image')) $attachmentType = 'image';
            elseif (str_starts_with($mime, 'video')) $attachmentType = 'video';
            elseif (str_starts_with($mime, 'audio')) $attachmentType = 'audio';
            else $attachmentType = 'file';
        }

        $message = Message::create([
            'user_id'         => auth()->id(),
            'receiver_id'     => $request->receiver_id,
            'body'            => $request->body,
            'attachment'      => $attachment,
            'attachment_type' => $attachmentType,
        ]);

        $message->load('sender');

        try {
            broadcast(new MessageSent($message))->toOthers();
        } catch (\Exception $e) {
            \Log::warning('Chat broadcast failed: ' . $e->getMessage());
        }

        $message->created_at = $message->created_at->format('H:i');

        return response()->json($message);
    }
}