'use strict';

/* --------------------------------------------------------------
 amazon_payment.js 2016-01-20
 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]
 --------------------------------------------------------------
 */

/* globals OffAmazonPayments */

/**
 * Widget to enable the Amazon payment button @ the checkout
 */
gambio.widgets.module('amazon_payment', [], function (data) {

    'use strict';

    // ########## VARIABLE INITIALIZATION ##########

    var $this = $(this),
        id = null,
        defaults = {
        // The url at which the amazon oder information is send
        url: 'request_port.php?module=AmazonAdvPay',
        // If amazon payment is successfull procced checkout to this url
        target: 'checkout_shipping.php',
        // The Amazon Payment seller ID
        sellerId: null,
        // Use the Amazon address book?
        addressBook: false
    },
        options = $.extend(true, {}, defaults, data),
        module = {};

    // ########## HELPER FUNCTIONS ##########

    /**
     * Helper function that add a class to the button
     * if the amazon payment was chosen in the checkout
     * process and the user gets back to the cart page
     * @private
     */
    var _highlightButton = function _highlightButton() {
        if (location.hash === '#amazonlogin') {
            $this.on('transitionend', function () {
                $this.removeClass('paywithamazonbtn_highlight');
            }).addClass('paywithamazonbtn_highlight');
        }
    };

    // ########## EVENT HANDLER ##########

    /**
     * Submit the "Amazon Order Reference" to
     * the shop system and proceed the checkout
     * @param       {object}        orderReference          The "Amazon Order Reference"
     * @private
     */
    var _signInHandler = function _signInHandler(orderReference) {
        var settings = {
            orderrefid: orderReference.getAmazonOrderReferenceId(),
            action: 'signIn'
        };

        $.post(options.url, settings).done(function (result) {
            if (result.continue === 'true') {
                window.location = options.target;
            }
        });
    };

    /**
     * Basic error handling if
     * something went wrong
     * @private
     */
    var _errorHandler = function _errorHandler() {
        // ToDo: proper error handling
        alert('ERROR in Amazon Payments');
    };

    // ########## INITIALIZATION ##########

    /**
     * Init function of the widget
     * @constructor
     */
    module.init = function (done) {

        id = $this.attr('id');

        try {
            new OffAmazonPayments.Widgets.Button({
                sellerId: options.sellerId,
                useAmazonAddressBook: options.addressBook,
                onSignIn: _signInHandler,
                onError: _errorHandler
            }).bind(id);
        } catch (ignore) {}

        _highlightButton();

        done();
    };

    // Return data to widget engine
    return module;
});
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