<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

/**
 * Servicio de autenticación para WhatsApp API
 */
class WhatsAppAuthService
{
    protected string $loginUrl;
    protected string $email;
    protected string $password;

    public function __construct()
    {
        $this->loginUrl = config('services.whatsapp.login_url', 'https://whatsapp.golsystems.mx/api/login');
        $this->email = config('services.whatsapp.auth_email', 'juan.zapata@golsystems.com.mx');
        $this->password = config('services.whatsapp.auth_password');
    }

    /**
     * Obtener token de acceso
     */
    public function getAccessToken(): string
    {
        if (!$this->email || !$this->password) {
            throw new \Exception('Las credenciales de WhatsApp no están configuradas en .env');
        }

        return Cache::remember('whatsapp_access_token', 3000, function () {
            try {
                $response = Http::timeout(30)
                    ->withHeaders([
                        'Content-Type' => 'application/json',
                        'Accept' => 'application/json',
                    ])
                    ->post($this->loginUrl, [
                        'email' => $this->email,
                        'password' => $this->password,
                    ]);

                if (!$response->successful()) {
                    Log::channel('daily')->error('WhatsApp Auth Error', [
                        'status' => $response->status(),
                        'body' => $response->body(),
                    ]);

                    throw new \Exception('Error al autenticar con WhatsApp API: ' . $response->body());
                }

                $data = $response->json();

                // La API puede retornar el token en diferentes formatos
                // Ajusta según la respuesta real de la API
                $token = $data['token']
                    ?? $data['access_token']
                    ?? $data['data']['token']
                    ?? null;

                if (!$token) {
                    Log::channel('daily')->error('WhatsApp Auth Error: No token in response', [
                        'response' => $data
                    ]);

                    throw new \Exception('La API de WhatsApp no retornó un token válido');
                }

                Log::channel('daily')->info('WhatsApp token obtenido exitosamente');

                return $token;

            } catch (\Exception $e) {
                Log::channel('daily')->error('WhatsApp Auth Exception', [
                    'error' => $e->getMessage(),
                ]);

                throw $e;
            }
        });
    }

    /**
     * Forzar renovación del token
     */
    public function refreshToken(): string
    {
        Cache::forget('whatsapp_access_token');
        return $this->getAccessToken();
    }
}