milojs/milo

'use strict';


var ComponentFacet = require('../c_facet')
    , facetsRegistry = require('./cf_registry')
    , miloCore = require('milo-core')
    , logger = miloCore.util.logger
    , _ = miloCore.proto;


var ItemFacet = _.createSubclass(ComponentFacet, 'Item');

_.extendProto(ItemFacet, {
    getState: ItemFacet$getState,
    setState: ItemFacet$setState,
    getIndex: ItemFacet$getIndex,
    setIndex: ItemFacet$setIndex,
    removeItem: ItemFacet$removeItem,
    extractItem: ItemFacet$extractItem,
    isSample: ItemFacet$isSample,
    require: ['Container', 'Dom', 'Data']
});

facetsRegistry.add(ItemFacet);

module.exports = ItemFacet;


function ItemFacet$getState() {
    return { state: {
        index: this.getIndex()
    }};
}


function ItemFacet$setState(state) {
    this.setIndex(state.state.index);
}


/**
 * Facet instance method
 * Returns the index of the owner component in it's parent list component
 * @return {Integer} The index
 */
function ItemFacet$getIndex() {
    return this.index;
}


/**
 * Facet instance method
 * Sets the index of this component
 * @param {Integer} index The index to be set
 */
function ItemFacet$setIndex(index) {
    var oldIndex = this.index;
    this.index = index;
    this.postMessage('indexchanged', { oldIndex: oldIndex, newIndex: index });
}


/**
 * ItemFacet instance method
 * Removes component from the list, component gets destroyed
 */
function ItemFacet$removeItem() {
    // this.list and this.index are set by the list when the item is added
    if (this.owner.isDestroyed())
        return logger.warn('ItemFacet: Attempted to call removeItem on destroyed component.');
    this.list.removeItem(this.index);
}


/**
 * ItemFacet instance method
 * Removes component from the list, component is NOT destroyed
 */
function ItemFacet$extractItem() {
    this.list.extractItem(this.index);
}


/**
* Returns true if the component is a sample for the containing list, false if not
* @return {Boolean}
*/
function ItemFacet$isSample() {
   return this.list.itemSample == this.owner;
}