<?php
/**
 * Classe para integração com WhatsApp Business API
 */
class WhatsAppBusinessAPI {
    private $apiUrl;
    private $token;
    private $phoneNumberId;
    
    public function __construct($token, $phoneNumberId) {
        $this->apiUrl = "https://graph.facebook.com/v18.0";
        $this->token = $token;
        $this->phoneNumberId = $phoneNumberId;
    }
    
    /**
     * Envia mensagem de texto
     */
    public function sendTextMessage($to, $message) {
        $data = [
            'messaging_product' => 'whatsapp',
            'recipient_type' => 'individual',
            'to' => $to,
            'type' => 'text',
            'text' => [
                'preview_url' => false,
                'body' => $message
            ]
        ];
        
        return $this->makeRequest('POST', "/{$this->phoneNumberId}/messages", $data);
    }
    
    /**
     * Envia mensagem com template
     */
    public function sendTemplateMessage($to, $templateName, $parameters = []) {
        $data = [
            'messaging_product' => 'whatsapp',
            'to' => $to,
            'type' => 'template',
            'template' => [
                'name' => $templateName,
                'language' => ['code' => 'pt_BR'],
                'components' => [
                    [
                        'type' => 'body',
                        'parameters' => $parameters
                    ]
                ]
            ]
        ];
        
        return $this->makeRequest('POST', "/{$this->phoneNumberId}/messages", $data);
    }
    
    private function makeRequest($method, $endpoint, $data = null) {
        $ch = curl_init($this->apiUrl . $endpoint);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_HTTPHEADER => [
                'Authorization: Bearer ' . $this->token,
                'Content-Type: application/json'
            ],
            CURLOPT_POSTFIELDS => json_encode($data)
        ]);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        return [
            'code' => $httpCode,
            'response' => json_decode($response, true)
        ];
    }
}

// Exemplo de uso
$whatsapp = new WhatsAppBusinessAPI($token, $phoneNumberId);
$whatsapp->sendTextMessage('5538999999999', 'Olá! Mensagem automática do sistema.');
?>

<?php
require 'vendor/autoload.php';

use Aws\S3\S3Client;
use Aws\Exception\AwsException;

/**
 * Classe para gerenciar arquivos no AWS S3
 */
class S3FileManager {
    private $s3Client;
    private $bucket;
    
    public function __construct($region, $bucket) {
        $this->bucket = $bucket;
        $this->s3Client = new S3Client([
            'region' => $region,
            'version' => 'latest'
        ]);
    }
    
    /**
     * Upload de arquivo para S3
     */
    public function uploadFile($filePath, $key, $acl = 'private') {
        try {
            $result = $this->s3Client->putObject([
                'Bucket' => $this->bucket,
                'Key' => $key,
                'SourceFile' => $filePath,
                'ACL' => $acl,
                'StorageClass' => 'STANDARD_IA',
                'Metadata' => [
                    'uploaded-by' => 'system',
                    'upload-date' => date('Y-m-d H:i:s')
                ]
            ]);
            
            return [
                'success' => true,
                'url' => $result['ObjectURL'],
                'etag' => $result['ETag']
            ];
        } catch (AwsException $e) {
            return [
                'success' => false,
                'error' => $e->getMessage()
            ];
        }
    }
    
    /**
     * Gera URL pré-assinada para download
     */
    public function getPresignedUrl($key, $expires = '+20 minutes') {
        $cmd = $this->s3Client->getCommand('GetObject', [
            'Bucket' => $this->bucket,
            'Key' => $key
        ]);
        
        $request = $this->s3Client->createPresignedRequest($cmd, $expires);
        return (string) $request->getUri();
    }
}
?>