/*
 *    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 Topic = require('./Topic').default;
const DragTopic = require('./DragTopic').default;
const INodeModel = require('./model/INodeModel').default;

const NodeGraph = new Class(
  /** @lends NodeGraph */ {
    /**
         * @constructs
         * @param {mindplot.model.NodeModel} nodeModel
         * @param {Object<Number, String, Boolean>} options
         * @throws will throw an error if nodeModel is null or undefined
         */
    initialize(nodeModel, options) {
      $assert(nodeModel, 'model can not be null');

      this._options = options;
      this._mouseEvents = true;
      this.setModel(nodeModel);
      this._onFocus = false;
      this._size = { width: 50, height: 20 };
    },

    /** @return true if option is set to read-only */
    isReadOnly() {
      return this._options.readOnly;
    },

    /** @return model type */
    getType() {
      const model = this.getModel();
      return model.getType();
    },

    /**
         * @param {String} id
         * @throws will throw an error if the topic id is not a number
         */
    setId(id) {
      $assert(typeof topic.getId() === 'number', `id is not a number:${id}`);
      this.getModel().setId(id);
    },

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

    /**
         * @return 2D element
         * @throws will throw an error if the element is null or undefined within node graph
         */
    get2DElement() {
      $assert(this._elem2d, 'NodeGraph has not been initialized properly');
      return this._elem2d;
    },

    /** @abstract */
    setPosition(point, fireEvent) {
      throw 'Unsupported operation';
    },

    /** */
    addEvent(type, listener) {
      const elem = this.get2DElement();
      elem.addEvent(type, listener);
    },

    /** */
    removeEvent(type, listener) {
      const elem = this.get2DElement();
      elem.removeEvent(type, listener);
    },

    /** */
    fireEvent(type, event) {
      const elem = this.get2DElement();
      elem.trigger(type, event);
    },

    /** */
    setMouseEventsEnabled(isEnabled) {
      this._mouseEvents = isEnabled;
    },

    /** */
    isMouseEventsEnabled() {
      return this._mouseEvents;
    },

    /** @return {Object<Number>} size */
    getSize() {
      return this._size;
    },

    /** @param {Object<Number>} size */
    setSize(size) {
      this._size.width = parseInt(size.width);
      this._size.height = parseInt(size.height);
    },

    /**
         * @return {mindplot.model.NodeModel} the node model
         */
    getModel() {
      $assert(this._model, 'Model has not been initialized yet');
      return this._model;
    },

    /**
         * @param {mindplot.NodeModel} model the node model
         * @throws will throw an error if model is null or undefined
         */
    setModel(model) {
      $assert(model, 'Model can not be null');
      this._model = model;
    },

    /** */
    getId() {
      return this._model.getId();
    },

    /** */
    setOnFocus(focus) {
      if (this._onFocus != focus) {
        this._onFocus = focus;
        const outerShape = this.getOuterShape();
        if (focus) {
          outerShape.setFill(Topic.OUTER_SHAPE_ATTRIBUTES_FOCUS.fillColor);
          outerShape.setOpacity(1);
        } else {
          outerShape.setFill(Topic.OUTER_SHAPE_ATTRIBUTES.fillColor);
          outerShape.setOpacity(0);
        }
        this.setCursor('move');

        // In any case, always try to hide the editor ...
        this.closeEditors();

        // Fire event ...
        this.fireEvent(focus ? 'ontfocus' : 'ontblur', this);
      }
    },

    /** @return {Boolean} true if the node graph is on focus */
    isOnFocus() {
      return this._onFocus;
    },

    /** */
    dispose(workspace) {
      this.setOnFocus(false);
      workspace.removeChild(this);
    },

    /** */
    createDragNode(layoutManager) {
      const dragShape = this._buildDragShape();
      return new DragTopic(dragShape, this, layoutManager);
    },

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

    /** */
    getPosition() {
      const model = this.getModel();
      return model.getPosition();
    },
  },
);

/**
 * creates a new topic from the given node model
 * @memberof mindplot.Nodegraph
 * @param {mindplot.model.NodeModel} nodeModel
 * @param {Object} options
 * @throws will throw an error if nodeModel is null or undefined
 * @throws will throw an error if the nodeModel's type is null or undefined
 * @throws will throw an error if the node type cannot be recognized as either central or main
 * topic type
 * @return {mindplot.CentralTopic|mindplot.MainTopic} the new topic
 */
NodeGraph.create = function (nodeModel, options) {
  const CentralTopic = require('./CentralTopic').default;
  const MainTopic = require('./MainTopic').default;

  $assert(nodeModel, 'Model can not be null');

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

  let result;
  if (type == INodeModel.CENTRAL_TOPIC_TYPE) {
    result = new CentralTopic(nodeModel, options);
  } else if (type == INodeModel.MAIN_TOPIC_TYPE) {
    result = new MainTopic(nodeModel, options);
  } else {
    $assert(false, `unsupported node type:${type}`);
  }

  return result;
};

export default NodeGraph;