/*

This file is part of Ext JS 4

Copyright (c) 2011 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as published by the Free Software Foundation and appearing in the file LICENSE included in the packaging of this file.  Please review the following information to ensure the GNU General Public License version 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.

*/
/**
 * @class Ext.ux.grid.menu.ListMenu
 * @extends Ext.menu.Menu
 * This is a supporting class for {@link Ext.ux.grid.filter.ListFilter}.
 * Although not listed as configuration options for this class, this class
 * also accepts all configuration options from {@link Ext.ux.grid.filter.ListFilter}.
 */
Ext.define('Ext.ux.grid.menu.ListMenu', {
    extend: 'Ext.menu.Menu',

    /**
     * @cfg {String} labelField
     * Defaults to 'text'.
     */
    labelField :  'text',
    /**
     * @cfg {String} paramPrefix
     * Defaults to 'Loading...'.
     */
    loadingText : 'Loading...',
    /**
     * @cfg {Boolean} loadOnShow
     * Defaults to true.
     */
    loadOnShow : true,
    /**
     * @cfg {Boolean} single
     * Specify true to group all items in this list into a single-select
     * radio button group. Defaults to false.
     */
    single : false,

    constructor : function (cfg) {
        this.selected = [];
        this.addEvents(
            /**
             * @event checkchange
             * Fires when there is a change in checked items from this list
             * @param {Object} item Ext.menu.CheckItem
             * @param {Object} checked The checked value that was set
             */
            'checkchange'
        );

        this.callParent([cfg = cfg || {}]);

        if(!cfg.store && cfg.options){
            var options = [];
            for(var i=0, len=cfg.options.length; i<len; i++){
                var value = cfg.options[i];
                switch(Ext.type(value)){
                    case 'array':  options.push(value); break;
                    case 'object': options.push([value.id, value[this.labelField]]); break;
                    case 'string': options.push([value, value]); break;
                }
            }

            this.store = Ext.create('Ext.data.ArrayStore', {
                fields: ['id', this.labelField],
                data:   options,
                listeners: {
                    'load': this.onLoad,
                    scope:  this
                }
            });
            this.loaded = true;
        } else {
            this.add({text: this.loadingText, iconCls: 'loading-indicator'});
            this.store.on('load', this.onLoad, this);
        }
    },

    destroy : function () {
        if (this.store) {
            this.store.destroyStore();
        }
        this.callParent();
    },

    /**
     * Lists will initially show a 'loading' item while the data is retrieved from the store.
     * In some cases the loaded data will result in a list that goes off the screen to the
     * right (as placement calculations were done with the loading item). This adapter will
     * allow show to be called with no arguments to show with the previous arguments and
     * thus recalculate the width and potentially hang the menu from the left.
     */
    show : function () {
        var lastArgs = null;
        return function(){
            if(arguments.length === 0){
                this.callParent(lastArgs);
            } else {
                lastArgs = arguments;
                if (this.loadOnShow && !this.loaded) {
                    this.store.load();
                }
                this.callParent(arguments);
            }
        };
    }(),

    /** @private */
    onLoad : function (store, records) {
        var me = this,
            visible = me.isVisible(),
            gid, item, itemValue, i, len;

        me.hide(false);

        me.removeAll(true);

        gid = me.single ? Ext.id() : null;
        for (i = 0, len = records.length; i < len; i++) {
            itemValue = records[i].get('id');
            item = Ext.create('Ext.menu.CheckItem', {
                text: records[i].get(me.labelField),
                group: gid,
                checked: Ext.Array.contains(me.selected, itemValue),
                hideOnClick: false,
                value: itemValue
            });

            item.on('checkchange', me.checkChange, me);

            me.add(item);
        }

        me.loaded = true;

        if (visible) {
            me.show();
        }
        me.fireEvent('load', me, records);
    },

    /**
     * Get the selected items.
     * @return {Array} selected
     */
    getSelected : function () {
        return this.selected;
    },

    /** @private */
    setSelected : function (value) {
        value = this.selected = [].concat(value);

        if (this.loaded) {
            this.items.each(function(item){
                item.setChecked(false, true);
                for (var i = 0, len = value.length; i < len; i++) {
                    if (item.value == value[i]) {
                        item.setChecked(true, true);
                    }
                }
            }, this);
        }
    },

    /**
     * Handler for the 'checkchange' event from an check item in this menu
     * @param {Object} item Ext.menu.CheckItem
     * @param {Object} checked The checked value that was set
     */
    checkChange : function (item, checked) {
        var value = [];
        this.items.each(function(item){
            if (item.checked) {
                value.push(item.value);
            }
        },this);
        this.selected = value;

        this.fireEvent('checkchange', item, checked);
    }
});