<?php

namespace App\Http\Controllers;

use App\Events\NuevoMensajeWhatsApp;
use App\Models\Alumno;
use App\Models\WhatsappLog;
use App\Services\WhatsAppService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;

class WhatsAppWebhookController extends Controller
{
    private array $optOutKeywords = ['stop', 'no', 'cancelar', 'detener', 'baja', 'salir'];

    public function verify(Request $request)
    {
        $verifyToken = config('services.whatsapp.verify_token');

        if (
            $request->get('hub_mode') === 'subscribe' &&
            $request->get('hub_verify_token') === $verifyToken
        ) {
            return response($request->get('hub_challenge'), 200);
        }

        return response('Forbidden', 403);
    }

    public function handle(Request $request, WhatsAppService $whatsapp)
    {
        $payload = $request->all();

        try {
            $entry   = $payload['entry'][0]  ?? null;
            $changes = $entry['changes'][0]  ?? null;
            $value   = $changes['value']     ?? null;
            $message = $value['messages'][0] ?? null;

            if (!$message) {
                return response()->json(['status' => 'ok']);
            }

            $telefono = $message['from'] ?? null;
            $tipo     = $message['type'] ?? 'text';
            $alumno   = $this->alumnoPorTelefono($telefono);
            $alumnoId = $alumno?->id;

            $logData = [
                'alumno_id' => $alumnoId,
                'telefono'  => $telefono,
                'tipo'      => 'recibido',
                'payload'   => $payload,
            ];

            if ($tipo === 'text') {
                $texto = $message['text']['body'] ?? '';
                $logData['mensaje']    = $texto;
                $logData['media_type'] = null;

                if ($this->esOptOut($texto)) {
                    $whatsapp->procesarOptOut($telefono);
                    $logData['tipo'] = 'opt_out';
                }
            } elseif (in_array($tipo, ['image', 'video', 'audio', 'document'])) {
                $mediaId = $message[$tipo]['id'] ?? null;

                if ($mediaId) {
                    $ruta = $whatsapp->descargarMedia($mediaId);
                    $logData['mensaje']    = $ruta;
                    $logData['media_type'] = $tipo;
                }
            }

            $log = WhatsappLog::create($logData);

            if ($alumnoId) {
                broadcast(new NuevoMensajeWhatsApp($log));

                // Marcar como no leído para el badge
                WhatsappLog::where('id', $log->id)->update(['leido' => false]);
            }
        } catch (\Throwable $e) {
            Log::error('WhatsApp webhook error', ['error' => $e->getMessage(), 'payload' => $payload]);
        }

        return response()->json(['status' => 'ok']);
    }

    private function alumnoPorTelefono(?string $telefono): ?Alumno
    {
        if (!$telefono) {
            return null;
        }

        $limpio = preg_replace('/\D/', '', $telefono);
        $sinCodigo = strlen($limpio) === 12 ? substr($limpio, 2) : $limpio;

        return Alumno::whereHas('alumnos', function ($q) use ($limpio, $sinCodigo) {
            $q->where('telefono', $limpio)->orWhere('telefono', $sinCodigo);
        })->first();
    }

    private function esOptOut(string $texto): bool
    {
        $normalizado = strtolower(trim($texto));

        foreach ($this->optOutKeywords as $keyword) {
            if ($normalizado === $keyword || str_contains($normalizado, $keyword)) {
                return true;
            }
        }

        return false;
    }
}