/*
 *    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.NodeGraph = new Class({
    initialize:function(nodeModel) {
        $assert(nodeModel, "model can not be null");
        this._mouseEvents = true;
        this.setModel(nodeModel);
        this._onFocus = false;
    },

    getType : function() {
        var model = this.getModel();
        return model.getType();
    },

    setId : function(id) {
        this.getModel().setId(id);
    },

    _set2DElement : function(elem2d) {
        this._elem2d = elem2d;
    },

    get2DElement : function() {
        $assert(this._elem2d, 'NodeGraph has not been initialized propertly');
        return this._elem2d;
    },

    setPosition : function(point) {
        // Elements are positioned in the center.
        var size = this._model.getSize();
        this._elem2d.setPosition(point.x - (size.width / 2), point.y - (size.height / 2));
        this._model.setPosition(point.x, point.y);
    },

    addEventListener : function(type, listener) {
        var elem = this.get2DElement();
        elem.addEventListener(type, listener);
    },

    isNodeGraph : function() {
        return true;
    },

    setMouseEventsEnabled : function(isEnabled) {
        this._mouseEvents = isEnabled;
    },

    isMouseEventsEnabled : function() {
        return this._mouseEvents;
    },

    getSize : function() {
        return this._model.getSize();
    },

    setSize : function(size) {
        this._model.setSize(size.width, size.height);
    },

    getModel:function() {
        $assert(this._model, 'Model has not been initialized yet');
        return  this._model;
    },

    setModel : function(model) {
        $assert(model, 'Model can not be null');
        this._model = model;
    },

    getId : function() {
        return this._model.getId();
    },

    setOnFocus : function(focus) {
        this._onFocus = focus;
        var outerShape = this.getOuterShape();
        if (focus) {
            outerShape.setFill('#c7d8ff');
            outerShape.setOpacity(1);

        } else {
            // @todo: node must not know about the topic.

            outerShape.setFill(mindplot.Topic.OUTER_SHAPE_ATTRIBUTES.fillColor);
            outerShape.setOpacity(0);
        }
        this.setCursor('move');
    },

    isOnFocus : function() {
        return this._onFocus;
    },

    dispose : function(workspace) {
        workspace.removeChild(this);
    },

    createDragNode : function() {
        var dragShape = this._buildDragShape();
        return  new mindplot.DragTopic(dragShape, this);
    },

    _buildDragShape : function() {
        $assert(false, '_buildDragShape must be implemented by all nodes.');
    },

    getPosition : function() {
        var model = this.getModel();
        return model.getPosition();
    }
});

mindplot.NodeGraph.create = function(nodeModel) {
    $assert(nodeModel, 'Model can not be null');

    var type = nodeModel.getType();
    $assert(type, 'Node model type can not be null');

    var result;
    if (type == mindplot.model.NodeModel.CENTRAL_TOPIC_TYPE) {
        result = new mindplot.CentralTopic(nodeModel);
    } else
    if (type == mindplot.model.NodeModel.MAIN_TOPIC_TYPE) {
        result = new mindplot.MainTopic(nodeModel);
    } else {
        assert(false, "unsupported node type:" + type);
    }

    return result;
}