/* --------------------------------------------------------------
 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 () {
        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 (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 () {
        // 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;
});