/**
 * Copyright 2013-2014 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 *
 * @jsx React.DOM
 */

/**
 * This component operates as a "Controller-View".  It listens for changes in
 * the TodoStore and passes the new data to its children.
 */


/**
 * Retrieve the current TODO data from the TodoStore
 */
function getTodoState() {
  return {
    allTodos: TodoStore.getAll(),
    areAllComplete: TodoStore.areAllComplete()
  };
}

var TodoApp = React.createClass({displayName: 'TodoApp',

  getInitialState: function() {
    return getTodoState();
  },

  componentDidMount: function() {
    TodoStore.addChangeListener(this._onChange);
  },

  componentWillUnmount: function() {
    TodoStore.removeChangeListener(this._onChange);
  },

  /**
   * @return {object}
   */
  render: function() {
  	return (
      React.DOM.div(null, 
        Header(null ),
        MainSection(
          {allTodos:this.state.allTodos,
          areAllComplete:this.state.areAllComplete}
        ),
        Footer( {allTodos:this.state.allTodos} )
      )
  	);
  },

  /**
   * Event handler for 'change' events coming from the TodoStore
   */
  _onChange: function() {

    console.log('HEARD CHANGE');
    this.setState(getTodoState());
  }

});
