<?php
/**
 * Proxy class for forwarding Deal API requests.
 * Compatible with PHP 5.6.
 */
class DealProxy
{
    /** Path to log file */
    private $logFile;

    public function __construct()
    {
        $this->logFile = __DIR__ . '/proxy.log';
    }

    /** Simple logger */
    private function logMessage($message)
    {
        $date = date('Y-m-d H:i:s');
        file_put_contents($this->logFile, "[$date] $message\n", FILE_APPEND);
    }

    /** Build the target URL based on incoming request */
    private function buildTargetUrl()
    {
        $path = isset($_GET['path']) ? $_GET['path'] : '';
        unset($_GET['path']);
        $query = http_build_query($_GET);
        $apiUrl = "https://llar.joyworkdev.ru/api/" . ltrim($path, '/');
        if ($query) {
            $apiUrl .= '?' . $query;
        }
        return $apiUrl;
    }

    /** Build headers for the forwarded request */
    private function buildHeaders()
    {
        $headers = array(
            'Accept: application/json',
        );

        // Preserve original Content-Type if present
        $originalContentType = isset($_SERVER['CONTENT_TYPE']) ? $_SERVER['CONTENT_TYPE'] : '';
        if ($originalContentType) {
            $headers[] = 'Content-Type: ' . $originalContentType;
            $this->logMessage("Incoming Content-Type: '$originalContentType'");
        } else {
            $this->logMessage('WARNING: Incoming Content-Type not detected');
        }

        // Pass session cookie if exists
        if (!empty($_COOKIE['PHPSESSID'])) {
            $headers[] = 'Cookie: PHPSESSID=' . $_COOKIE['PHPSESSID'];
        }
        // Pass custom header from Vue if present
        if (!empty($_SERVER['HTTP_X_SESSION_ID'])) {
            $headers[] = 'X-Session-ID: ' . $_SERVER['HTTP_X_SESSION_ID'];
        }
        return $headers;
    }

    /** Forward the request using cURL and output the response */
    private function forwardRequest($targetUrl, $headers, $method, $body)
    {
        $ch = curl_init();
        curl_setopt_array($ch, array(
            CURLOPT_URL => $targetUrl,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_POSTFIELDS => $body,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_HEADER => false,
        ));

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $curlError = curl_error($ch);
        if ($curlError) {
            $this->logMessage('cURL Error: ' . $curlError);
        }
        curl_close($ch);

        http_response_code($httpCode);
        echo $response;
    }

    /** Main handler – called from index.php */
    public function handle()
    {
        // CORS headers – must be sent before any output
        header('Access-Control-Allow-Origin: *');
        header('Access-Control-Allow-Credentials: true');
        header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');
        header('Access-Control-Allow-Headers: Accept, Content-Type, X-Requested-With, Authorization');
        if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
            http_response_code(204);
            exit;
        }

        $targetUrl = $this->buildTargetUrl();
        $headers   = $this->buildHeaders();
        $method    = $_SERVER['REQUEST_METHOD'];
        $body      = file_get_contents('php://input');
        $this->logMessage('Forwarding request to ' . $targetUrl);
        $this->forwardRequest($targetUrl, $headers, $method, $body);
    }
}
?>