/*!
 * Ext JS Library 3.2.0
 * Copyright(c) 2006-2010 Ext JS, Inc.
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
Ext.ns('Ext.ux.tree');

/**
 * @class Ext.ux.tree.TreeGridSorter
 * @extends Ext.tree.TreeSorter
 * Provides sorting of nodes in a {@link Ext.ux.tree.TreeGrid}.  The TreeGridSorter automatically monitors events on the
 * associated TreeGrid that might affect the tree's sort order (beforechildrenrendered, append, insert and textchange).
 * Example usage:<br />
 * <pre><code>
 new Ext.ux.tree.TreeGridSorter(myTreeGrid, {
     folderSort: true,
     dir: "desc",
     sortType: function(node) {
         // sort by a custom, typed attribute:
         return parseInt(node.id, 10);
     }
 });
 </code></pre>
 * @constructor
 * @param {TreeGrid} tree
 * @param {Object} config
 */
Ext.ux.tree.TreeGridSorter = Ext.extend(Ext.tree.TreeSorter, {
    /**
     * @cfg {Array} sortClasses The CSS classes applied to a header when it is sorted. (defaults to <tt>['sort-asc', 'sort-desc']</tt>)
     */
    sortClasses : ['sort-asc', 'sort-desc'],
    /**
     * @cfg {String} sortAscText The text displayed in the 'Sort Ascending' menu item (defaults to <tt>'Sort Ascending'</tt>)
     */
    sortAscText : 'Sort Ascending',
    /**
     * @cfg {String} sortDescText The text displayed in the 'Sort Descending' menu item (defaults to <tt>'Sort Descending'</tt>)
     */
    sortDescText : 'Sort Descending',

    constructor : function(tree, config) {
        if(!Ext.isObject(config)) {
            config = {
                property: tree.columns[0].dataIndex || 'text',
                folderSort: true
            }
        }

        Ext.ux.tree.TreeGridSorter.superclass.constructor.apply(this, arguments);

        this.tree = tree;
        tree.on('headerclick', this.onHeaderClick, this);
        tree.ddAppendOnly = true;

        me = this;
        this.defaultSortFn = function(n1, n2){

            var dsc = me.dir && me.dir.toLowerCase() == 'desc';
            var p = me.property || 'text';
            var sortType = me.sortType;
            var fs = me.folderSort;
            var cs = me.caseSensitive === true;
            var leafAttr = me.leafAttr || 'leaf';

            if(fs){
                if(n1.attributes[leafAttr] && !n2.attributes[leafAttr]){
                    return 1;
                }
                if(!n1.attributes[leafAttr] && n2.attributes[leafAttr]){
                    return -1;
                }
            }
            var v1 = sortType ? sortType(n1) : (cs ? n1.attributes[p] : n1.attributes[p].toUpperCase());
            var v2 = sortType ? sortType(n2) : (cs ? n2.attributes[p] : n2.attributes[p].toUpperCase());
            if(v1 < v2){
                return dsc ? +1 : -1;
            }else if(v1 > v2){
                return dsc ? -1 : +1;
            }else{
                return 0;
            }
        };

        tree.on('afterrender', this.onAfterTreeRender, this, {single: true});
        tree.on('headermenuclick', this.onHeaderMenuClick, this);
    },

    onAfterTreeRender : function() {
        if(this.tree.hmenu){
            this.tree.hmenu.insert(0,
                {itemId:'asc', text: this.sortAscText, cls: 'xg-hmenu-sort-asc'},
                {itemId:'desc', text: this.sortDescText, cls: 'xg-hmenu-sort-desc'}
            );
        }
        this.updateSortIcon(0, 'asc');
    },

    onHeaderMenuClick : function(c, id, index) {
        if(id === 'asc' || id === 'desc') {
            this.onHeaderClick(c, null, index);
            return false;
        }
    },

    onHeaderClick : function(c, el, i) {
        if(c && !this.tree.headersDisabled){
            var me = this;

            me.property = c.dataIndex;
            me.dir = c.dir = (c.dir === 'desc' ? 'asc' : 'desc');
            me.sortType = c.sortType;
            me.caseSensitive === Ext.isBoolean(c.caseSensitive) ? c.caseSensitive : this.caseSensitive;
            me.sortFn = c.sortFn || this.defaultSortFn;

            this.tree.root.cascade(function(n) {
                if(!n.isLeaf()) {
                    me.updateSort(me.tree, n);
                }
            });

            this.updateSortIcon(i, c.dir);
        }
    },

    // private
    updateSortIcon : function(col, dir){
        var sc = this.sortClasses;
        var hds = this.tree.innerHd.select('td').removeClass(sc);
        hds.item(col).addClass(sc[dir == 'desc' ? 1 : 0]);
    }
});