/*
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
*/

/* Fix for Opera, which does not seem to include the map function on Array's */
if (!Array.prototype.map) {
    Array.prototype.map = function(fun){
        var len = this.length;
        if (typeof fun != 'function') {
            throw new TypeError();
        }
        var res = new Array(len);
        var thisp = arguments[1];
        for (var i = 0; i < len; i++) {
            if (i in this) {
                res[i] = fun.call(thisp, this[i], i, this);
            }
        }
        return res;
    };
}

Ext.ns('Ext.ux.data');

/**
 * @class Ext.ux.data.PagingMemoryProxy
 * @extends Ext.data.MemoryProxy
 * <p>Paging Memory Proxy, allows to use paging grid with in memory dataset</p>
 */
Ext.ux.data.PagingMemoryProxy = Ext.extend(Ext.data.MemoryProxy, {
    constructor : function(data){
        Ext.ux.data.PagingMemoryProxy.superclass.constructor.call(this);
        this.data = data;
    },
    doRequest : function(action, rs, params, reader, callback, scope, options){
        params = params ||
        {};
        var result;
        try {
            result = reader.readRecords(this.data);
        } 
        catch (e) {
            this.fireEvent('loadexception', this, options, null, e);
            callback.call(scope, null, options, false);
            return;
        }
        
        // filtering
        if (params.filter !== undefined) {
            result.records = result.records.filter(function(el){
                if (typeof(el) == 'object') {
                    var att = params.filterCol || 0;
                    return String(el.data[att]).match(params.filter) ? true : false;
                }
                else {
                    return String(el).match(params.filter) ? true : false;
                }
            });
            result.totalRecords = result.records.length;
        }
        
        // sorting
        if (params.sort !== undefined) {
            // use integer as params.sort to specify column, since arrays are not named
            // params.sort=0; would also match a array without columns
            var dir = String(params.dir).toUpperCase() == 'DESC' ? -1 : 1;
            var fn = function(v1, v2){
                return v1 > v2 ? 1 : (v1 < v2 ? -1 : 0);
            };
            result.records.sort(function(a, b){
                var v = 0;
                if (typeof(a) == 'object') {
                    v = fn(a.data[params.sort], b.data[params.sort]) * dir;
                }
                else {
                    v = fn(a, b) * dir;
                }
                if (v == 0) {
                    v = (a.index < b.index ? -1 : 1);
                }
                return v;
            });
        }
        // paging (use undefined cause start can also be 0 (thus false))
        if (params.start !== undefined && params.limit !== undefined) {
            result.records = result.records.slice(params.start, params.start + params.limit);
        }
        callback.call(scope, result, options, true);
    }
});

//backwards compat.
Ext.data.PagingMemoryProxy = Ext.ux.data.PagingMemoryProxy;