add_action('woocommerce_checkout_order_processed', 'custom_api_call_send_file', 10, 1);

function custom_api_call_send_file($order_id) {
    // Get order details if needed
    $order = wc_get_order($order_id);

    // Path to the file you want to send
    $file_path = get_template_directory() . '/path-to-your-file/example.pdf'; // Update the path to your file
    
    if (!file_exists($file_path)) {
        error_log('File not found: ' . $file_path);
        return;
    }

    // Prepare file data for the API call
    $file_data = array(
        'file' => curl_file_create($file_path, mime_content_type($file_path), basename($file_path))
    );

    // Additional data to send with the file
    $expiry_date = date('Y-m-d H:i:s', strtotime('+7 days')); //expires in 7 days
    $expiry_time = '11:00';
    
    $body = array(
        'ExpiryDate'        => $expiry_date,
        'ExpiryTime'           => $expiry_time,
        'ExpiryMessage'  => 'The document has expired',
    );

    // Combine file data and additional data
    $post_data = array_merge($body, $file_data);

    // Make the API call
    $api_url = 'https://allaboutpdfapi.com/api/applydrm';
    $response = wp_remote_post($api_url, array(
        'method'    => 'POST',
        'body'      => $post_data,
        'headers'   => array(
            'Content-Type' => 'multipart/form-data',
            'x-api-key' => 'YOUR API KEY'
        ),
    ));

    $response_body = wp_remote_retrieve_body($response);
    $response_data = json_decode($response_body, true);

    if (isset($response_data['filename']) && isset($response_data['filedata'])) {
        $decoded_file = base64_decode($response_data['filedata']);
        if ($decoded_file === false) {
            error_log('Failed to decode the Base64 file from the API response.');
            return;
        }

        // Save the file to the server
        $save_path = get_template_directory() . '/path-to-save/' . sanitize_file_name($response_data['filename']);
        $file_written = file_put_contents($save_path, $decoded_file);

        if ($file_written === false) {
            error_log('Failed to save the file: ' . $save_path);
        } else {
            error_log('File saved successfully: ' . $save_path);
        }
    } else {
        error_log('API response did not include expected file data.');
    }
}