<?php
/* --------------------------------------------------------------
   function.paypal_ec_button.php 2018-10-09
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2018 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

/**
 * Outputs the required Express Checkout PayPal HTML
 *
 * If the "Express Checkout Buttons" are enabled from the admin section this function will
 * output the required HTML that will display the buttons which will load the required JS modules.
 *
 * @param array  $params
 * @param Smarty $smarty
 *
 * @return string Returns the button HTML along with its corresponding "paypal_ec_button" JS widget.
 */
function smarty_function_paypal_ec_button($params, &$smarty)
{
    if (!isset($params['page'])) {
        throw new InvalidArgumentException('The "page" parameter is required but was not provided in the smarty '
                                           . 'function "paypal_ec_button".');
    }
    
    $displayButton = (strpos((string)@constant('MODULE_PAYMENT_INSTALLED'), 'paypal3.php') !== false);
    $displayButton = $displayButton && (strtolower((string)@constant('MODULE_PAYMENT_PAYPAL3_STATUS')) === 'true');
    $html          = '';
    
    if (!$displayButton) {
        return $html;
    }
    
    $paypalConfiguration = MainFactory::create('PayPalConfigurationStorage');
    
    switch ($params['page']) {
        case 'product':
            $displayButton &= $paypalConfiguration->get('use_ecs_products');
            break;
        case 'cart':
            $displayButton &= $paypalConfiguration->get('use_ecs_cart');
            break;
        default:
            $displayButton &= 0;
    }
    
    if ($displayButton) {
        $languageCode = strtoupper($_SESSION['language_code']);
        
        $supportedLanguages = ['DE', 'EN', 'ES', 'FR', 'IT', 'NL'];
        
        if (!in_array($languageCode, $supportedLanguages, true)) {
            $languageCode = 'EN';
        }
        
        $buttonStyle    = $paypalConfiguration->get('ecs_button_style');
        $buttonImageUrl = GM_HTTP_SERVER . DIR_WS_CATALOG . 'images/icons/paypal/' . $buttonStyle . 'Btn_'
                          . $languageCode . '.png';
        
        $html = '<div class="paypal-ec-button-container">' . '<img class="paypal-ec-button" src="' . $buttonImageUrl
                . '" alt="PayPal ECS" ' . 'data-gambio-widget="paypal_ec_button" ' . 'data-paypal_ec_button-page="'
                . $params['page'] . '" ' . 'data-paypal_ec_button-redirect="'
                . (isset($_SESSION['paypal_cart_ecs']) ? 'true' : 'false') . '" '
                . 'data-paypal_ec_button-display-cart="' . DISPLAY_CART . '"/>' . '</div>';
    }
    
    return $html;
}