define(function(require, exports, module) {
"use strict";
var Util = require('./util'),
	Base = require('./base'),
	XScroll = require('./xscroll');
/** 
 * A master for multi-scrollers.
 * @constructor
 * @param {object} cfg - config for master.
 * @extends Base
 */
var XScrollMaster = function(cfg) {
	XScrollMaster.superclass.constructor.call(this, cfg);
	this.init(cfg);
}

Util.extend(XScrollMaster, Base, {
	/**
	 * init the master
	 * @memberof XScrollMaster
	 * @param {object} cfg config for master
	 * @param {string} selector xscroll root elements,it will be set to xscroll.renderTo
	 * @return {XScrollMaster}
	 */
	init: function(cfg) {
		var self = this;
		self.userConfig = Util.mix({
			selector: ".xscroll"
		}, cfg)
		return self;
	},
	/**
	 * find xscroll instance
	 * @memberof XScrollMaster
	 * @param {string} id element id for xscroll instance
	 * @return {XScroll} xscroll instance
	 */
	get: function(id) {
		var self = this;
		if (!id) return;
		for (var i = 0, l = self.xscrolls.length; i < l; i++) {
			if (self.xscrolls[i].renderTo.id === id) {
				return self.xscrolls[i];
			}
		}
		return;
	},
	getElPos: function() {
		var self = this;
		var elpos = [];
		var els = document.querySelectorAll(self.userConfig.selector);
		for (var i = 0; i < els.length; i++) {
			var content = els[i].querySelector('.xs-content');
			elpos.push({
				el: els[i],
				containerWidth: content.offsetWidth,
				containerHeight: content.offsetHeight,
				width: els[i].offsetWidth,
				height: els[i].offsetHeight
			})
		}
		return elpos;
	},
	/**
	 * render xscrolls
	 * @memberof XScrollMaster
	 * @return {XScrollMaster}
	 */
	render: function() {
		var self = this;
		var findByEl = function(el, xscrolls) {
			if (!el || !xscrolls) return;
			for (var i = 0, l = xscrolls.length; i < l; i++) {
				if (xscrolls[i].renderTo === el) {
					return xscrolls[i];
				}
			}
		}
		var els = document.querySelectorAll(self.userConfig.selector);
		var elpos = self.getElPos();
		for(var i in self.xscrolls){
			//destroy
			self.xscrolls[i].destroy();
		}
		self.xscrolls = [];
		for (var i = 0; i < els.length; i++) {
			self.xscrolls.push(new XScroll({
				renderTo: els[i],
				containerWidth: elpos[i].containerWidth,
				containerHeight: elpos[i].containerHeight,
				width: elpos[i].width,
				height: elpos[i].height
			}).render());
		}
		for (var i = 0, l = self.xscrolls.length; i < l; i++) {
			var innerEls = self.xscrolls[i].renderTo.querySelectorAll(self.userConfig.selector);
			for (var j = 0; j < innerEls.length; j++) {
				var xscroll = findByEl(innerEls[j], self.xscrolls);
				if (xscroll && self.xscrolls[i].controller) {
					self.xscrolls[i].controller.add(xscroll);
				}
			}
		}
		self._bindEvt();
		return self;
	},
	_bindEvt: function() {
		var self = this;
		window.addEventListener("resize", function(e) {
			setTimeout(function() {
				var elpos = self.getElPos();
				for (var i = 0, l = self.xscrolls.length; i < l; i++) {
					var xscroll = self.xscrolls[i];
					xscroll.userConfig.containerWidth = elpos[i].containerWidth;
					xscroll.userConfig.containerHeight = elpos[i].containerHeight;
					xscroll.userConfig.width = elpos[i].width;
					xscroll.userConfig.height = elpos[i].height;
					xscroll.boundry.refresh({
						width: xscroll.userConfig.width,
						height: xscroll.userConfig.height
					});
					xscroll.boundryCheck(0);
					xscroll.render();
				}
			}, 0);
		}, self);
	}
});

if (typeof module == 'object' && module.exports) {
	module.exports = XScrollMaster;
}
/** ignored by jsdoc **/
else {
	return window.XScrollMaster = XScrollMaster;
}
});