//公共方法
var util = (function($){
	/*提示组件 参数含义 1.状态 2.提示文字 3.多久消失*/
	function tipHtml(state,text,time){
		var html='<div class="tipHtml">'
			if(state){
				if(state=='loading'){
					html+='<div class="icon weui-icon_toast weui-icon-'+state+'"></div>'
				}else{
					html+='<div class="icon weui-icon-'+state+'"></div>'
				}
			}
			html+='<div>'+ text +'</div>'
		html+='</div>'

		$("body").append(html)

		if(time && typeof time=='number'){
			setTimeout(function(){
				$(".tipHtml").remove()
			},time)
		}
	}
	//旋转动画
	function loading(ele){
		html='<div class="loader-inner ball-clip-rotate">'
			html+='<div class="weui-icon-loading"></div>'
		html+='</div>';

		ele.append(html)
	}

	function hideLoading(){
		$(".loader-inner").remove()
	}
	//隐藏提示
	function hideTip(){
		$(".tipHtml").remove()
	}
	/*	传入的元素，屏蔽默认事件， 
		当多个元素滑动时，ios平台会出现bug ，
		屏蔽默认事件，重新赋值事件	*/
	function overscroll(el) {
	    el.addEventListener('touchstart', function() {
	        var top = el.scrollTop
	            , totalScroll = el.scrollHeight
	            , currentScroll = top + el.offsetHeight;
	        if(top === 0) {
	            el.scrollTop = 1;
	        } else if(currentScroll === totalScroll) {
	            el.scrollTop = top - 1;
	        }
	    })
	    el.addEventListener('touchmove', function(evt) {
	        if(el.offsetHeight < el.scrollHeight)
	            evt._isScroller = true
	    })
	    document.body.addEventListener('touchmove', function(evt) {
	        if(!evt._isScroller) {
	            evt.preventDefault()
	        }
	    })
	}

	// 判断是否支持blob方式
	var hasBlobConstructor = typeof Blob !== "undefined" &&
	function() {
		try {
			return Boolean(new Blob)
		} catch (e) {
			return false
		}
	}();

	var hasArrayBufferViewSupport = hasBlobConstructor && typeof Uint8Array !== "undefined" &&
	function() {
		try {
			return new Blob([new Uint8Array(100)]).size === 100
		} catch (e) {
			return false
		}
	}();

	function toBlob(canvas, type){

		var dataURI = canvas.toDataURL(type);
		var dataURIParts = dataURI.split(",");
		var byteString = undefined;
		if (dataURIParts[0].indexOf("base64") >= 0) {
			byteString = atob(dataURIParts[1])
		} else {
			byteString = decodeURIComponent(dataURIParts[1])
		}
		var arrayBuffer = new ArrayBuffer(byteString.length);
		var intArray = new Uint8Array(arrayBuffer);
		for (var i = 0; i < byteString.length; i += 1) {
			intArray[i] = byteString.charCodeAt(i)
		}
		var mimeString = dataURIParts[0].split(":")[1].split(";")[0];
		var blob = null;
		if (hasBlobConstructor) {
			blob = new Blob([hasArrayBufferViewSupport ? intArray : arrayBuffer], {
				type: mimeString
			})
		} else {
			var bb = new BlobBuilder;
			bb.append(arrayBuffer);
			blob = bb.getBlob(mimeString)
		}
		return blob

	
	}
	//加载图片
	function loadImage(image, file, callback){
		if (typeof URL === "undefined") {
			var reader = new FileReader;
			reader.onload = function(evt) {
				image.src = evt.target.result;
				if (callback) {
					callback()
				}
			};
			reader.readAsDataURL(file)
		} else {
			image.src = URL.createObjectURL(file);
			if (callback) {
				callback()
			}
		}
	}
	//生成一个时间戳
	function returnDataTime(){
		return Date.parse(new Date())/1000
	}
	return {
		tipHtml:tipHtml,
		hideTip:hideTip,
		toBlob:toBlob,
		loadImage:loadImage,
		returnDataTime:returnDataTime,
		loading:loading,
		hideLoading:hideLoading
	}
})(jQuery)

module.exports = util;