<?php

namespace App\Services;

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

/**
 * Servicio para envío de mensajes de WhatsApp
 */
class WhatsAppService
{
    protected string $apiUrl;
    protected int $orgId;
    protected string $token;
    protected string $email = 'juan.zapata@golsystems.com.mx';

    public function __construct()
    {
        $this->apiUrl = config('services.whatsapp.api_url', 'https://whatsapp.golsystems.mx/api/send-whatsapp');
        $this->orgId = config('services.whatsapp.org_id', 1);
        $this->token = config('services.whatsapp.token');

        if (!$this->token) {
            throw new \Exception('El token de WhatsApp no está configurado. Agrega WHATSAPP_TOKEN en tu archivo .env');
        }
    }

    /**
     * Enviar documento por WhatsApp usando plantilla facturas_pdv
     */
    public function sendDocument(
        string $phoneNumber,
        string $documentUrl,
        string $filename,
        string $userEmail,
        string $ticket,
        string $customerName
    ): array {
        try {
            // Construir el mensaje de WhatsApp usando plantilla
            $whatsappMessage = json_encode([
                'messaging_product' => 'whatsapp',
                'to' => $this->cleanPhoneNumber($phoneNumber),
                'type' => 'template',
                'template' => [
                    'name' => 'facturas_pdv',
                    'language' => [
                        'code' => 'es_MX',
                    ],
                    'components' => [
                        [
                            'type' => 'header',
                            'parameters' => [
                                [
                                    'type' => 'document',
                                    'document' => [
                                        'filename' => $filename,
                                        'link' => $documentUrl,
                                    ],
                                ],
                            ],
                        ],
                        [
                            'type' => 'body',
                            'parameters' => [
                                [
                                    'type' => 'text',
                                    'text' => $customerName,
                                ],
                                [
                                    'type' => 'text',
                                    'text' => $ticket,
                                ],
                            ],
                        ],
                    ],
                ],
            ]);

            // Preparar payload completo
            $payload = [
                'message' => $whatsappMessage,
                'email' => $userEmail,
                'org_id' => $this->orgId,
                'ticket' => $ticket,
                'customer' => $customerName,
            ];

            // Enviar petición HTTP con token Bearer
            $response = Http::timeout(30)
                ->withHeaders([
                    'Content-Type' => 'application/json',
                    'Accept' => 'application/json',
                    'Authorization' => 'Bearer ' . $this->token,
                ])
                ->post($this->apiUrl, $payload);

            // Registrar en logs
            Log::channel('daily')->info('WhatsApp message sent', [
                'phone' => $phoneNumber,
                'ticket' => $ticket,
                'customer' => $customerName,
                'status_code' => $response->status(),
            ]);

            if ($response->successful()) {
                return [
                    'success' => true,
                    'message' => 'Mensaje enviado correctamente',
                    'data' => $response->json(),
                ];
            }

            // Log detallado del error
            Log::channel('daily')->error('WhatsApp API error', [
                'phone' => $phoneNumber,
                'status_code' => $response->status(),
                'error_body' => $response->body(),
            ]);

            return [
                'success' => false,
                'message' => 'Error al enviar el mensaje',
                'error' => $response->body(),
                'status_code' => $response->status(),
            ];

        } catch (\Exception $e) {
            Log::channel('daily')->error('WhatsApp sending failed', [
                'phone' => $phoneNumber,
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return [
                'success' => false,
                'message' => 'Error al conectar con el servicio de WhatsApp',
                'error' => $e->getMessage(),
            ];
        }
    }

    /**
     * Enviar factura por WhatsApp
     */
    public function sendInvoice(
        string $phoneNumber,
        string $pdfUrl,
        ?string $xmlUrl,
        string $invoiceNumber,
        string $customerName
    ): array {
        // Enviar PDF
        $pdfResult = $this->sendDocument(
            phoneNumber: $phoneNumber,
            documentUrl: $pdfUrl,
            filename: "Factura_{$invoiceNumber}.pdf",
            userEmail: $this->email,
            ticket: $invoiceNumber,
            customerName: $customerName
        );

        // Si hay XML y el PDF se envió correctamente, enviarlo también
        if ($xmlUrl && $pdfResult['success']) {
            $xmlResult = $this->sendDocument(
                phoneNumber: $phoneNumber,
                documentUrl: $xmlUrl,
                filename: "Factura_{$invoiceNumber}.xml",
                userEmail: $this->email,
                ticket: "{$invoiceNumber}_XML",
                customerName: $customerName
            );

            return [
                'success' => $pdfResult['success'] && $xmlResult['success'],
                'pdf' => $pdfResult,
                'xml' => $xmlResult,
            ];
        }

        return $pdfResult;
    }

    /**
     * Limpiar número de teléfono
     */
    protected function cleanPhoneNumber(string $phone): string
    {
        // Eliminar todo excepto números
        $cleaned = preg_replace('/[^0-9]/', '', $phone);

        // Asegurar que tenga código de país (52 para México)
        if (strlen($cleaned) === 10) {
            $cleaned = '52' . $cleaned;
        }

        return $cleaned;
    }
}