/*
This file is part of Ext JS 3.4

Copyright (c) 2011-2013 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.

Build date: 2013-04-03 15:07:25
*/
/**
 * @class Ext.tree.TreeFilter
 * Note this class is experimental and doesn't update the indent (lines) or expand collapse icons of the nodes
 * @param {TreePanel} tree
 * @param {Object} config (optional)
 */
Ext.tree.TreeFilter = function(tree, config){
    this.tree = tree;
    this.filtered = {};
    Ext.apply(this, config);
};

Ext.tree.TreeFilter.prototype = {
    clearBlank:false,
    reverse:false,
    autoClear:false,
    remove:false,

     /**
     * Filter the data by a specific attribute.
     * @param {String/RegExp} value Either string that the attribute value
     * should start with or a RegExp to test against the attribute
     * @param {String} attr (optional) The attribute passed in your node's attributes collection. Defaults to "text".
     * @param {TreeNode} startNode (optional) The node to start the filter at.
     */
    filter : function(value, attr, startNode){
        attr = attr || "text";
        var f;
        if(typeof value == "string"){
            var vlen = value.length;
            // auto clear empty filter
            if(vlen == 0 && this.clearBlank){
                this.clear();
                return;
            }
            value = value.toLowerCase();
            f = function(n){
                return n.attributes[attr].substr(0, vlen).toLowerCase() == value;
            };
        }else if(value.exec){ // regex?
            f = function(n){
                return value.test(n.attributes[attr]);
            };
        }else{
            throw 'Illegal filter type, must be string or regex';
        }
        this.filterBy(f, null, startNode);
	},

    /**
     * Filter by a function. The passed function will be called with each
     * node in the tree (or from the startNode). If the function returns true, the node is kept
     * otherwise it is filtered. If a node is filtered, its children are also filtered.
     * @param {Function} fn The filter function
     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node.
     */
    filterBy : function(fn, scope, startNode){
        startNode = startNode || this.tree.root;
        if(this.autoClear){
            this.clear();
        }
        var af = this.filtered, rv = this.reverse;
        var f = function(n){
            if(n == startNode){
                return true;
            }
            if(af[n.id]){
                return false;
            }
            var m = fn.call(scope || n, n);
            if(!m || rv){
                af[n.id] = n;
                n.ui.hide();
                return false;
            }
            return true;
        };
        startNode.cascade(f);
        if(this.remove){
           for(var id in af){
               if(typeof id != "function"){
                   var n = af[id];
                   if(n && n.parentNode){
                       n.parentNode.removeChild(n);
                   }
               }
           }
        }
    },

    /**
     * Clears the current filter. Note: with the "remove" option
     * set a filter cannot be cleared.
     */
    clear : function(){
        var t = this.tree;
        var af = this.filtered;
        for(var id in af){
            if(typeof id != "function"){
                var n = af[id];
                if(n){
                    n.ui.show();
                }
            }
        }
        this.filtered = {};
    }
};
