Ext.namespace('Ext.ux.Andrie');

/**
 * @class Ext.ux.Andrie.pPageSize
 * @extends Ext.PagingToolbar
 * A combobox control that glues itself to a PagingToolbar's pageSize configuration property.
 * @constructor
 * Create a new PageSize plugin.
 * @param {Object} config Configuration options
 * @author Andrei Neculau - andrei.neculau@gmail.com / http://andreineculau.wordpress.com
 * @version 0.6
 */
Ext.ux.Andrie.pPageSize = function(config){
	Ext.apply(this, config);
};

Ext.extend(Ext.ux.Andrie.pPageSize, Ext.util.Observable, {
	/**
	 * @cfg {String} beforeText
	 * Text to display before the comboBox
	 */
	beforeText: 'Show',
	
	/**
	 * @cfg {String} afterText
	 * Text to display after the comboBox
	 */
	afterText: 'items',
	
	/**
	 * @cfg {Mixed} addBefore
	 * Toolbar item(s) to add before the PageSizer
	 */
	addBefore: '-',
	
	/**
	 * @cfg {Mixed} addAfter
	 * Toolbar item(s) to be added after the PageSizer
	 */
	addAfter: null,
	
	/**
	 * @cfg {Bool} dynamic
	 * True for dynamic variations, false for static ones
	 */
	dynamic: false,
	
	/**
	 * @cfg {Array} variations
	 * Variations used for determining pageSize options
	 */
	variations: [5, 10, 20, 50, 100, 200, 500, 1000],
	
	/**
	 * @cfg {Object} comboCfg
	 * Combo config object that overrides the defaults
	 */
	comboCfg: undefined,
	
	init: function(pagingToolbar){
		this.pagingToolbar = pagingToolbar;
		this.pagingToolbar.pageSizeCombo = this;
		this.pagingToolbar.setPageSize = this.setPageSize.createDelegate(this);
		this.pagingToolbar.getPageSize = function(){
			return this.pageSize;
		}
		this.pagingToolbar.on('render', this.onRender, this);
	},
	
	//private
	addSize:function(value){
		if (value>0){
			this.sizes.push([value]);
		}
	},
	
	//private
	updateStore: function(){
		if (this.dynamic) {
			var middleValue = this.pagingToolbar.pageSize, start;
			middleValue = (middleValue > 0) ? middleValue : 1;
			this.sizes = [];
			var v = this.variations;
			for (var i = 0, len = v.length; i < len; i++) {
				this.addSize(middleValue - v[v.length - 1 - i]);
			}
			this.addToStore(middleValue);
			for (var i = 0, len = v.length; i < len; i++) {
				this.addSize(middleValue + v[i]);
			}
		}else{
			if (!this.staticSizes){
				this.sizes = [];
				var v = this.variations;
				var middleValue = 0;
				for (var i = 0, len = v.length; i < len; i++) {
					this.addSize(middleValue + v[i]);
				}
				this.staticSizes = this.sizes.slice(0);
			}else{
				this.sizes = this.staticSizes.slice(0);
			}
		}
		this.combo.store.loadData(this.sizes);
		this.combo.collapse();
		this.combo.setValue(this.pagingToolbar.pageSize);
	},

	setPageSize:function(value, forced){
		var pt = this.pagingToolbar;
		this.combo.collapse();
		value = parseInt(value) || parseInt(this.combo.getValue());
		value = (value>0)?value:1;
		if (value == pt.pageSize){
			return;
		}else if (value < pt.pageSize){
			pt.pageSize = value;
			var ap = Math.round(pt.cursor/value)+1;
			var cursor = (ap-1)*value;
			var store = pt.store;
			if (cursor > store.getTotalCount()) {
				this.pagingToolbar.pageSize = value;
				this.pagingToolbar.doLoad(cursor-value);
			}else{
				store.suspendEvents();
				for (var i = 0, len = cursor - pt.cursor; i < len; i++) {
					store.remove(store.getAt(0));
				}
				while (store.getCount() > value) {
					store.remove(store.getAt(store.getCount() - 1));
				}
				store.resumeEvents();
				store.fireEvent('datachanged', store);
				pt.cursor = cursor;
				var d = pt.getPageData();
				pt.afterTextEl.el.innerHTML = String.format(pt.afterPageText, d.pages);
				pt.field.dom.value = ap;
				pt.first.setDisabled(ap == 1);
				pt.prev.setDisabled(ap == 1);
				pt.next.setDisabled(ap == d.pages);
				pt.last.setDisabled(ap == d.pages);
				pt.updateInfo();
			}
		}else{
			this.pagingToolbar.pageSize = value;
			this.pagingToolbar.doLoad(Math.floor(this.pagingToolbar.cursor/this.pagingToolbar.pageSize) * this.pagingToolbar.pageSize);
		}
		this.updateStore();
	},
	
	//private
	onRender: function(){
		this.combo = Ext.ComponentMgr.create(Ext.applyIf(this.comboCfg||{}, {
			store:new Ext.data.SimpleStore({
				fields:['pageSize'],
				data:[]
			}),
			displayField:'pageSize',
			valueField:'pageSize',
			mode:'local',
			triggerAction:'all',
			width:50,
			xtype:'combo'
		}));
		this.combo.on('select', this.setPageSize, this);
		this.updateStore();
		
		if (this.addBefore){
			this.pagingToolbar.add(this.addBefore);
		}
		if (this.beforeText){
			this.pagingToolbar.add(this.beforeText);
		}
		this.pagingToolbar.add(this.combo);
		if (this.afterText){
			this.pagingToolbar.add(this.afterText);
		}
		if (this.addAfter){
			this.pagingToolbar.add(this.addAfter);
		}
	}
})