/*
 *    Copyright [2015] [wisemapping]
 *
 *   Licensed under WiseMapping Public License, Version 1.0 (the "License").
 *   It is basically the Apache License, Version 2.0 (the "License") plus the
 *   "powered by wisemapping" text requirement on every single page;
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the license at
 *
 *       http://www.wisemapping.org/license
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License 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.
 */
const Command = require('../Command').default;

const AddTopicCommand = new Class(
    /** @lends AddTopicCommand */ {
        Extends: Command,
        /**
         * @classdesc This command class handles do/undo of adding one or multiple topics to
         * the mindmap.
         * @constructs
         * @param {Array<mindplot.model.NodeModel>} models one or multiple models
         * @param {Array<String>} parentTopicsId ids of the parent topics to add the children to, or null
         * when attaching a dragged node or a node/branch from clipboard
         * @extends mindplot.Command
         */
        initialize: function (models, parentTopicsId) {
            $assert(models, 'models can not be null');
            $assert(
                parentTopicsId == null || parentTopicsId.length == models.length,
                'parents and models must have the same size'
            );

            this.parent();
            this._models = models;
            this._parentsIds = parentTopicsId;
        },

        /**
         * Overrides abstract parent method
         */
        execute: function (commandContext) {
            var me = this;
            _.each(this._models, function (model, index) {
                // Add a new topic ...
                var topic = commandContext.createTopic(model);

                // Connect to topic ...
                if (me._parentsIds) {
                    var parentId = me._parentsIds[index];
                    if ($defined(parentId)) {
                        var parentTopic = commandContext.findTopics(parentId)[0];
                        commandContext.connect(topic, parentTopic);
                    }
                } else {
                    commandContext.addTopic(topic);
                }

                // Select just created node ...
                var designer = commandContext._designer;
                designer.onObjectFocusEvent(topic);
                topic.setOnFocus(true);

                // Render node ...
                topic.setVisibility(true);
            });
        },

        /**
         * Overrides abstract parent method
         * @see {@link mindplot.Command.undoExecute}
         */
        undoExecute: function (commandContext) {
            // Delete disconnected the nodes. Create a copy of the topics ...
            var clonedModel = [];
            _.each(this._models, function (model) {
                clonedModel.push(model.clone());
            });

            // Finally, remove the nodes ...
            _.each(this._models, function (model) {
                var topicId = model.getId();
                var topic = commandContext.findTopics(topicId)[0];
                commandContext.deleteTopic(topic);
            });

            this._models = clonedModel;
        },
    }
);

export default AddTopicCommand;