;(function(doc, win, undefined) {
    "use strict";

    var start = {  //記錄開始的觸點
            x: 0,
            y: 0
        },
        delta = {  //記錄滑動距離
            x: 0,
            y: 0
        },
        startTime = 0, //開始時間
		curTime=0,     //從開始到現在的事件
        longTime = 200,//200ms觸發長按事件
		longCurTime=1000, //1000ms 手指不移開即可觸發 通過定時器往上加
        target,
        minDelta = 50,//最小滑動距離
		timer=null;

    //建立事件物件
    function createEvent(type) {
        var event;

        try {
            event = new Event(type);
        } catch (e) {
            event = doc.createEvent("Events");
            event.initEvent(type, true, true);
        }

        return event;
    }
    
	//觸發事件
    function fireEvent(type, target) {
        var event = createEvent(type);

        target.dispatchEvent(event);
    }

    
	//觸控時觸發的函式
    function onTouchStart(event) {
		
        var touch = event.touches[0];

        //判斷預設行為是否可以被禁用
		if (event.cancelable) {
			// 判斷預設行為是否已經被禁用
			if (!event.defaultPrevented) {
				event.preventDefault();
			}
		}

        target = event.target;
        
		//獲取開始的觸點
        start.x = touch.pageX;
        start.y = touch.pageY;

        delta.x = 0;
        delta.y = 0;
        
		//當前觸控時的時間
        startTime =new Date();
        
		//持續觸控不動400ms 則生成longCurTap事件
		timer=setInterval(function(){
		  curTime+=10;
		  if(curTime==longCurTime){
		    fireEvent("longCurTap", target);    
		  }
		  //console.log(curTime);
		},1);
    }
    
	//滑動時觸發的函式
    function onTouchMove(event) {
        var touch = event.touches[0];
        
		//計算滑動的距離
        delta.x = touch.pageX - start.x;
        delta.y = touch.pageY - start.y;
        
		
    }
    
	//移開時觸發的函式
    function onTouchEnd(event) {
		
		//手指移開後先清除定時器（服務於longCurTap）
		clearInterval(timer);
        curTime=0;

		//獲取自上次觸控以來發生了什麼改變的touch物件的陣列
        var touch = event.changedTouches[0],
            deltaTime =new Date() - startTime,
			

			//返回滑動距離的絕對值
            deltaX = Math.abs(delta.x),
            deltaY = Math.abs(delta.y);
			//console.log(deltaTime);
		

        //判斷位置是否發生改變
        if (touch.pageX === start.x && touch.pageY === start.y) {
            
			//判斷觸控時間是否小於200ms
            if (deltaTime < longTime) {
                fireEvent("tap", target);//觸控事件
				//console.log(deltaTime);
            } else if(deltaTime > longTime && deltaTime < longCurTime/2){
                fireEvent("longTap", target);//長按事件
            }
        }
        
		//判斷滑動距離是否超過30
        if (deltaX > minDelta || deltaY > minDelta) {
            
			//比較 x,y 滑動邊的長度來判斷方向
            if (deltaX > deltaY) {
                if (delta.x > 0) {
                    fireEvent("swipeRight", target);
                } else {
                    fireEvent("swipeLeft", target);
                }
            } else {
                if (delta.y > 0) {
                    fireEvent("swipeDown", target);
                } else {
                    fireEvent("swipeUp", target);
                }
            }
        }
    }

	//監聽三個觸控事件
    doc.addEventListener("touchstart", onTouchStart);
    doc.addEventListener("touchmove", onTouchMove);
    doc.addEventListener("touchend", onTouchEnd);

}(document, window));