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/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
define([
    'jquery',
    'jquery/ui'
], function ($) {
    'use strict';

    $.widget('mage.form', {
        options: {
            handlersData: {
                save: {},
                saveAndContinueEdit: {
                    action: {
                        args: {
                            back: 'edit'
                        }
                    }
                },
                preview: {
                    target: '_blank'
                }
            }
        },

        /**
         * Form creation
         * @protected
         */
        _create: function () {
            this._bind();
        },

        /**
         * Set form attributes to initial state
         * @protected
         */
        _rollback: function () {
            if (this.oldAttributes) {
                this.element.prop(this.oldAttributes);
            }
        },

        /**
         * Check if field value is changed
         * @protected
         * @param {Object} e - event object
         */
        _changesObserver: function (e) {
            var target = $(e.target),
                changed;

            if (e.type === 'focus' || e.type === 'focusin') {
                this.currentField = {
                    statuses: {
                        checked: target.is(':checked'),
                        selected: target.is(':selected')
                    },
                    val: target.val()
                };

            } else {
                if (this.currentField) { //eslint-disable-line no-lonely-if
                    changed = target.val() !== this.currentField.val ||
                        target.is(':checked') !== this.currentField.statuses.checked ||
                        target.is(':selected') !== this.currentField.statuses.selected;

                    if (changed) { //eslint-disable-line max-depth
                        target.trigger('changed');
                    }
                }
            }
        },

        /**
         * Get array with handler names
         * @protected
         * @return {Array} Array of handler names
         */
        _getHandlers: function () {
            var handlers = [];

            $.each(this.options.handlersData, function (key) {
                handlers.push(key);
            });

            return handlers;
        },

        /**
         * Store initial value of form attribute
         * @param {String} attrName - name of attribute
         * @protected
         */
        _storeAttribute: function (attrName) {
            var prop;

            this.oldAttributes = this.oldAttributes || {};

            if (!this.oldAttributes[attrName]) {
                prop = this.element.attr(attrName);
                this.oldAttributes[attrName] = prop ? prop : '';
            }
        },

        /**
         * Bind handlers
         * @protected
         */
        _bind: function () {
            this.element
                .on(this._getHandlers().join(' '), $.proxy(this._submit, this))
                .on('focus blur focusin focusout', $.proxy(this._changesObserver, this));
        },

        /**
         * Get action url for form
         * @param {Object|String} data - object with parameters for action url or url string
         * @return {String} action url
         */
        _getActionUrl: function (data) {
            if (typeof data === 'object') {
                return this._buildURL(this.oldAttributes.action, data.args);
            }

            return typeof data === 'string' ? data : this.oldAttributes.action;
        },

        /**
         * Add additional parameters into URL
         * @param {String} url - original url
         * @param {Object} params - object with parameters for action url
         * @return {String} action url
         * @private
         */
        _buildURL: function (url, params) {
            var concat = /\?/.test(url) ? ['&', '='] : ['/', '/'];

            url = url.replace(/[\/&]+$/, '');
            $.each(params, function (key, value) {
                url += concat[0] + key + concat[1] + window.encodeURIComponent(value);
            });

            return url + (concat[0] === '/' ? '/' : '');
        },

        /**
         * Prepare data for form attributes
         * @protected
         * @param {Object} data
         * @return {Object}
         */
        _processData: function (data) {
            $.each(data, $.proxy(function (attrName, attrValue) {
                this._storeAttribute(attrName);

                if (attrName === 'action') {
                    data[attrName] = this._getActionUrl(attrValue);
                }
            }, this));

            return data;
        },

        /**
         * Get additional data before form submit
         * @protected
         * @param {String} handlerName
         * @param {Object} data
         */
        _beforeSubmit: function (handlerName, data) {
            var submitData = {},
                event = new $.Event('beforeSubmit');

            this.element.trigger(event, [submitData, handlerName]);
            data = $.extend(
                true, {},
                this.options.handlersData[handlerName] || {},
                submitData,
                data
            );
            this.element.prop(this._processData(data));

            return !event.isDefaultPrevented();
        },

        /**
         * Submit the form
         * @param {Object} e - event object
         * @param {Object} data - event data object
         */
        _submit: function (e, data) {
            this._rollback();

            if (this._beforeSubmit(e.type, data) !== false) {
                this.element.trigger('submit', e);
            }
        }
    });

    return $.mage.form;
});