'use strict';

/* --------------------------------------------------------------
 paypal_ec_button.js 2016-02-26
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2016 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * PayPal Express Checkout Button
 *
 * This widget handles the "PayPal Express Checkout" button functionality.
 *
 * It needs the following options:
 *
 * - data-paypal_ec_button-page >> (string) The current page of the widget instance will alter its behavior.
 * - data-paypal_ec_button-redirect >> (bool) Whether to redirect to PayPal directly upon widget initialization.
 * - data-paypal_ec_button-display-cart >> (bool) Whether the app will automatically navigate to the shopping cart page
 *   after a product was added to the cart. This settings comes from the admin section.
 *
 * @module Widgets/paypal_ec_button
 */
gambio.widgets.module('paypal_ec_button', [], function (data) {

    'use strict';

    var $this = $(this),
        module = {};

    /**
     * Redirect the browser to the PayPal controller.
     *
     * @private
     */
    var _redirectToPayPal = function _redirectToPayPal() {
        var paypalUrl = jse.core.config.get('appUrl').replace(/\/$/, '') + '/shop.php?do=PayPal/PrepareECS';
        window.location.href = paypalUrl;
    };

    /**
     * On PayPal Button Click
     *
     * This event handle will react differently according to the current page. If we are on the
     * shopping cart page there is only a redirect to the PayPal/PrepareECS page. But if we are
     * on the product details page then we first have to make a get request to the PayPal/CartECS
     * that will prepare.
     *
     * @private
     */
    var _onPayPalButtonClick = function _onPayPalButtonClick() {
        if (data.page === 'cart') {
            _redirectToPayPal();
        } else if (data.page === 'product') {
            var activateUrl = jse.core.config.get('appUrl') + '/shop.php?do=PayPal/CartECS';

            $.get(activateUrl, function () {
                // Click the "Add to Cart" button.
                $('input[name="btn-add-to-cart"]').click();

                if (data.displayCart === false) {
                    // Wait until the cart is display which means that the product was successfully inserted in the
                    // shopping cart and then navigate to PayPal page. If the cart is not displayed after 10 seconds
                    // that means that the item was not added to the shopping cart.
                    var currentDate = new Date(),
                        timeout = 10; // seconds

                    var interval = setInterval(function () {
                        if ($('.cart-dropdown:visible').length > 0) {
                            clearInterval(interval);
                            _redirectToPayPal();
                        }

                        if ((new Date().getTime() - currentDate.getTime()) / 1000 > timeout) {
                            clearInterval(interval); // Check has timed out.
                        }
                    }, 100);
                }
            });
        } else {
            throw new Error('Invalid page attribute provided: ' + data.page);
        }
    };

    /**
     * Initialize Module
     */
    module.init = function (done) {
        // If the "redirect" option is enabled then navigate directly to PayPal page. This option is necessary when
        // the DISPLAY_CART is enabled which means that after a product has been added to the cart the app will
        // automatically redirect to the shopping cart page.
        if (data.redirect === true) {
            _redirectToPayPal();
        }

        // Bind the button event handler.
        $this.on('click', _onPayPalButtonClick);

        done();
    };

    return module;
});
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