//此文件实现将控制命令封装成协议，具体协议内容请看：
//链接：http://note.youdao.com/noteshare?id=dabda6c613adef7a416bd2625cd770a1
 
 //bcc校验码计算
 //arry: 要计算的数组
 //返回计算协议中校验位的校验码
 function calBcc(arry)
 {
	var bcc = 0;
	for(i = 0;i < arry.length;i++)
	{
		bcc ^= arry[i];
	}
	return bcc;
 }
 
 //数组打印，调试用
 function PrintArry(data)
 {
	 var str = "";
	 
	 for(i = 0;i < data.length;i++)
	 {
		 str =  str + data[i].toString(16).padStart(2,'0');
	 }
	 
	 str = str.toUpperCase();
	 return str;
 }
 
 //sn:板卡sn号，stirng
 //type：数据类型，数字
 //jsonCmd: json命令
 //返回值：生成一个Uint8Array，通过websocket发送给板卡
 function makeFrame(sn, dataType, jsonCmd)
 {
	 var index = 0;
	 var dataLen  = jsonCmd.length;
	 var frameLen = dataLen + 26;
	 var outPut = new Uint8Array(frameLen);
	 outPut[index++] = 0x68;
	 outPut[index++] = (dataLen & 0xff000000) >> 24;
	 outPut[index++] = (dataLen & 0x00ff0000) >> 16;
	 outPut[index++] = (dataLen & 0x0000ff00) >> 8;
	 outPut[index++] =  dataLen & 0x000000ff;
	 outPut[index++] = 0;//类型为client
	 
	 //sn号赋值，string转ascii
	 for( i = 0;i< sn.length;i++)
	 {
		 outPut[index++] = sn[i].charCodeAt();
	 }
	 
	 outPut[index++] = dataType;//指定数据类型为json
	 //json string转ascii
	 for( i = 0;i< jsonCmd.length;i++)
	 {
		 outPut[index++] = jsonCmd[i].charCodeAt();
	 }
	 
	 var bccBuffer = outPut.slice(1, frameLen-3 + 1);//忽略协议头和协议尾
	 outPut[index++] = calBcc(bccBuffer);
	 outPut[index++] = 0x16;
	 // console.log("打印数组:%s", PrintArry(outPut));
	 console.log("数组长度:%d", outPut.length);
	 //return PrintArry(outPut);
	 return outPut;
 }
 //触发键盘事件, code表示键盘值
 function ExexuteKeyDown(code,sn)
 {	 
	 var jsonObj = {"data":{"keyCode":code, "event":"keyDown"}};
	 var json = JSON.stringify(jsonObj);
	 console.log("json==================",json);
	 // var sn = "RK3923C1201900139";
	 return makeFrame(sn, 0, json);
 }
 //触发鼠标按下事件，x：x坐标， y：y坐标
 function ExexuteMouseDown(x, y,sn)
 {
	 var jsonObj = {"data":{"action":0, "count":1, "pointerId":0,"x":x, "y":y}, "event":"0"};
	 var json = JSON.stringify(jsonObj);
	 console.log("json==================",json);
	 // var sn = "RK3923C1201900139";
	 return  makeFrame(sn, 0, json);
 }
  //触发鼠标移动事件，x：x坐标， y：y坐标
 function ExexuteMouseMove(x, y,sn)
 {
	 var jsonObj = {"data":{"action":2, "count":1, "pointerId":0,"x":x, "y":y}, "event":"2"};
	 var json = JSON.stringify(jsonObj);
	 // var sn = "RK3923C1201900139";
	 return  makeFrame(sn, 0, json);	 
 }
 
 function ExexuteKeyBoard(keycode,sn)
 {
 	 var jsonObj = {"data":{"keyCode":keycode.toString()},"event":"keyCode"};
 	 var json = JSON.stringify(jsonObj);
 	 // var sn = "RK3923C1201900139";
 	 return  makeFrame(sn, 0, json);	 
 }
 
  //触发鼠标抬起事件，x：x坐标， y：y坐标
 function ExexuteMouseUp(x, y,sn)
 {
	 var jsonObj = {"data":{"action":1, "count":1, "pointerId":0,"x":x, "y":y}, "event":"1"};
	 var json = JSON.stringify(jsonObj);
	 // var sn = "RK3923C1201900139";
	 return makeFrame(sn, 0, json);	 
 }
 //触发滑动事件
 function ExexuteMove(data,sn)
 {
 	 // var jsonObj = {"data":{"action":1, "count":1, "pointerId":0,"x":x, "y":y}, "event":"1"};
 	 // var json = JSON.stringify(jsonObj);
 	 // var sn = "RK3923C1201900139";
 	 return makeFrame(sn, 0, data);	 
 }
 //示例：
 //var sn = "RK3923C1201900139";
 //var json = "{\"data\":{\"keyCode\":24},\"type\":\"keyDown\"}";
// makeFrame(sn, 0, json);
//ExexuteKeyDown()