/**
 * Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
define([
    'jquery',
    'Magento_Customer/js/customer-data',
    'Magento_Customer/js/section-config',
    'Amazon_Payment/js/model/amazonPaymentConfig',
    'amazonCsrf',
    'modernizr/modernizr',
    'amazonCore',
    'jquery/ui',
    'uiRegistry'
], function ($, customerData, sectionConfig, amazonPaymentConfig, amazonCsrf) {
    'use strict';
    var _this;

    if (amazonPaymentConfig.isDefined()) {

        $.widget('amazon.AmazonButton', {
            options: {
                merchantId: null,
                buttonType: 'LwA',
                buttonColor: 'Gold',
                buttonSize: 'medium',
                redirectUrl: null,
                loginPostUrl: null
            },

            /**
             * Create button
             */
            _create: function () {
                _this = this;

                this._verifyAmazonConfig();

                if (typeof OffAmazonPayments === 'undefined') {
                    // async render
                    $(window).on('OffAmazonPayments', $.proxy(function () {
                        this._renderAmazonButton();
                    }, this));
                } else {
                    this._renderAmazonButton();
                }
            },

            /**
             * Verify if checkout config is available
             * @private
             */
            _verifyAmazonConfig: function () {
                if (amazonPaymentConfig.isDefined()) {
                    this.options.merchantId = amazonPaymentConfig.getValue('merchantId');
                    this.options.buttonType = this.options.buttonType === 'LwA' ?
                        amazonPaymentConfig.getValue('buttonTypeLwa') : amazonPaymentConfig.getValue('buttonTypePwa');
                    this.options.buttonColor = amazonPaymentConfig.getValue('buttonColor');
                    this.options.buttonSize = amazonPaymentConfig.getValue('buttonSize');
                    this.options.redirectUrl = amazonPaymentConfig.getValue('redirectUrl');
                    this.options.loginPostUrl = amazonPaymentConfig.getValue('loginPostUrl');
                    this.options.loginScope = amazonPaymentConfig.getValue('loginScope');
                    this.options.buttonLanguage = amazonPaymentConfig.getValue('displayLanguage');
                }
            },

            /**
             * Validate CSRF cookie and redirect to HTTPS
             */
            secureHttpsCallback: function (event) {
                var sections = sectionConfig.getAffectedSections(_this.options.loginPostUrl);

                if (!event.state || !amazonCsrf.isValid(event.state)) {
                    window.location = amazonPaymentConfig.getValue('customerLoginPageUrl');

                    return window.location;
                }

                // jscs:disable requireCamelCaseOrUpperCaseIdentifiers
                if (!event.access_token || !!event.error) {
                    window.location = amazonPaymentConfig.getValue('customerLoginPageUrl');

                    return window.location;
                }

                if (sections) {
                    customerData.invalidate(sections);
                }
                window.location = _this.options.redirectUrl + '?access_token=' + event.access_token;
                // jscs:enable requireCamelCaseOrUpperCaseIdentifiers
            },

            /**
             * Use popup or redirect URI
             *
             * @return {String}
             */
            _popupCallback: function () {
                return _this.usePopUp() ? _this.secureHttpsCallback :
                    amazonPaymentConfig.getValue('oAuthHashRedirectUrl');
            },

            /**
             * Are touch events available
             * (Supports both v2 and v3 Modernizr)
             * @returns {Boolean}
             * @private
             */
            _touchSupported: function () {
                //eslint-disable-next-line no-undef
                return Modernizr.touch !== undefined ? Modernizr.touch : Modernizr.touchevents;
            },

            /**
             * Should we use the pop up login flow?
             *  - are we on an HTTPS page (required for popup)
             *  - confirm we are not on the product detail page (items are added asynchronously to the cart,
             *    hence popups will be blocked)
             *  - confirm we are not using a touch device (redirect provides a better mobile experience)
             * @returns {Boolean}
             * @public
             */
            usePopUp: function () {
                return window.location.protocol === 'https:' && !$('body').hasClass('catalog-product-view') &&
                    !this._touchSupported();
            },

            /**
             * onAmazonPaymentsReady
             * @private
             */
            _renderAmazonButton: function () {
                OffAmazonPayments.Button(this.element[0].id, this.options.merchantId, { //eslint-disable-line no-undef
                    type: this.options.buttonType,
                    color: this.options.buttonColor,
                    size: this.options.buttonSize,
                    language: this.options.buttonLanguage,

                    /**
                     * Authorization callback
                     */
                    authorization: function () {
                        //eslint-disable-next-line no-undef
                        amazon.Login.authorize(_this._getLoginOptions(), _this._popupCallback());
                    }
                });
                $('.amazon-button-container .field-tooltip').fadeIn();
            },

            /**
             * Build login options
             * @returns {{scope: *, popup: *, state: *}}
             * @private
             */
            _getLoginOptions: function () {
                return {
                    scope: this.options.loginScope,
                    popup: this.usePopUp(),
                    state: amazonCsrf.generateNewValue()
                };
            }
        });

        return $.amazon.AmazonButton;
    }
});