/*
*    Copyright [2011] [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.
*/

mindplot.commands.DeleteTopicCommand = new Class(
{
    Extends:mindplot.Command,
    initialize: function(topicsIds)
    {
        $assert(topicsIds, "topicsIds must be defined");
        this._selectedObjectsIds = topicsIds;
        this._deletedTopicModels = [];
        this._parentTopicIds = [];
        this._deletedRelationships = [];
        this._id = mindplot.Command._nextUUID();
    },
    execute: function(commandContext)
    {
        var topics = commandContext.findTopics(this._selectedObjectsIds.nodes);
        if(topics.length>0){
        topics.forEach(
                function(topic, index)
                {
                    var model = topic.getModel().clone();

                     //delete relationships
                    var relationships = topic.getRelationships();
                    while(relationships.length>0){
                        var relationship = relationships[0];
                        this._deletedRelationships.push(relationship.getModel().clone());
                        commandContext.removeRelationship(relationship.getModel());
                    }

                    this._deletedTopicModels.push(model);

                    // Is connected?.
                    var outTopic = topic.getOutgoingConnectedTopic();
                    var outTopicId = null;
                    if (outTopic != null)
                    {
                        outTopicId = outTopic.getId();
                    }
                    this._parentTopicIds.push(outTopicId);

                    // Finally, delete the topic from the workspace...
                    commandContext.deleteTopic(topic);

                }.bind(this)
                ); }
        var lines = commandContext.findRelationships(this._selectedObjectsIds.relationshipLines);
        if(lines.length>0){
            lines.forEach(function(line,index){
                if(line.isInWorkspace()){
                    this._deletedRelationships.push(line.getModel().clone());
                        commandContext.removeRelationship(line.getModel());
                }
            }.bind(this));
        }
    },
    undoExecute: function(commandContext)
    {

        var topics = commandContext.findTopics(this._selectedObjectsIds);
        var parent = commandContext.findTopics(this._parentTopicIds);

        this._deletedTopicModels.forEach(
                function(model, index)
                {
                    var topic = commandContext.createTopic(model);

                    // Was the topic connected?
                    var parentTopic = parent[index];
                    if (parentTopic != null)
                    {
                        commandContext.connect(topic, parentTopic);
                    }

                }.bind(this)
                );
        this._deletedRelationships.forEach(
            function(relationship, index){
            commandContext.createRelationship(relationship);
        }.bind(this));

        this._deletedTopicModels = [];
        this._parentTopicIds = [];
        this._deletedRelationships = [];
    }
});