<?php
declare(strict_types=1);

class WhatsAppSender
{
    private const API_VERSION = 'v18.0';
    private const BASE_URL = 'https://graph.facebook.com';

    public static function sendText(string $to, string $text, string $phoneNumberId): array
    {
        return self::callApi($phoneNumberId, [
            'messaging_product' => 'whatsapp',
            'recipient_type'    => 'individual',
            'to'                => $to,
            'type'              => 'text',
            'text'              => ['body' => $text],
        ]);
    }

    public static function sendTemplate(string $to, string $templateName, string $phoneNumberId, array $components = []): array
    {
        $payload = [
            'messaging_product' => 'whatsapp',
            'recipient_type'    => 'individual',
            'to'                => $to,
            'type'              => 'template',
            'template'          => [
                'name'       => $templateName,
                'language'   => ['code' => 'es'],
            ],
        ];

        if (!empty($components)) {
            $payload['template']['components'] = $components;
        }

        return self::callApi($phoneNumberId, $payload);
    }

    public static function sendImage(string $to, string $mediaIdOrUrl, string $phoneNumberId, ?string $caption = null): array
    {
        $payload = [
            'messaging_product' => 'whatsapp',
            'recipient_type'    => 'individual',
            'to'                => $to,
            'type'              => 'image',
            'image'             => [
                (str_starts_with($mediaIdOrUrl, 'http') ? 'link' : 'id') => $mediaIdOrUrl,
            ],
        ];

        if ($caption !== null) {
            $payload['image']['caption'] = $caption;
        }

        return self::callApi($phoneNumberId, $payload);
    }

    public static function sendInteractive(string $to, array $interactive, string $phoneNumberId): array
    {
        return self::callApi($phoneNumberId, [
            'messaging_product' => 'whatsapp',
            'recipient_type'    => 'individual',
            'to'                => $to,
            'type'              => 'interactive',
            'interactive'       => $interactive,
        ]);
    }

    public static function uploadMedia(string $filePath, string $mimeType, string $phoneNumberId): array
    {
        $url = self::BASE_URL . '/' . self::API_VERSION . '/' . $phoneNumberId . '/media';
        $token = env('WHATSAPP_ACCESS_TOKEN', '');

        if ($token === '') {
            return ['success' => false, 'error' => 'WHATSAPP_ACCESS_TOKEN no configurado'];
        }

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => [
                'messaging_product' => 'whatsapp',
                'file'              => new \CURLFile($filePath, $mimeType, basename($filePath)),
            ],
            CURLOPT_HTTPHEADER     => [
                'Authorization: Bearer ' . $token,
            ],
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT        => 60,
        ]);

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error    = curl_error($ch);
        curl_close($ch);

        $decoded = $response ? json_decode($response, true) : null;
        unlink($filePath);

        return [
            'success'   => $httpCode >= 200 && $httpCode < 300,
            'http_code' => $httpCode,
            'media_id'  => $decoded['id'] ?? null,
            'response'  => $decoded ?? $response,
            'error'     => $error ?: null,
        ];
    }

    public static function sendDocument(string $to, string $mediaId, string $phoneNumberId, ?string $caption = null, ?string $filename = null): array
    {
        $document = ['id' => $mediaId];
        if ($filename !== null) {
            $document['filename'] = $filename;
        }
        if ($caption !== null) {
            $document['caption'] = $caption;
        }

        return self::callApi($phoneNumberId, [
            'messaging_product' => 'whatsapp',
            'recipient_type'    => 'individual',
            'to'                => $to,
            'type'              => 'document',
            'document'          => $document,
        ]);
    }

    private static function callApi(string $phoneNumberId, array $payload): array
    {
        $url = self::BASE_URL . '/' . self::API_VERSION . '/' . $phoneNumberId . '/messages';
        $token = env('WHATSAPP_ACCESS_TOKEN', '');

        if ($token === '') {
            return ['success' => false, 'error' => 'WHATSAPP_ACCESS_TOKEN no configurado'];
        }

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => json_encode($payload),
            CURLOPT_HTTPHEADER     => [
                'Authorization: Bearer ' . $token,
                'Content-Type: application/json',
            ],
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT        => 15,
        ]);

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error    = curl_error($ch);
        curl_close($ch);

        $decoded = $response ? json_decode($response, true) : null;

        return [
            'success'   => $httpCode >= 200 && $httpCode < 300,
            'http_code' => $httpCode,
            'response'  => $decoded ?? $response,
            'error'     => $error ?: ($decoded['error']['message'] ?? null),
            'wam_id'    => $decoded['messages'][0]['id'] ?? null,
        ];
    }
}