import o0 from "./o0.js"

module.exports = {
    SandbagAlgorithm: class{
        constructor() {

			this.stableAcc = new o0.Vector2(0,0);
			this.stableGyr = new o0.Vector2(0,0);
			this.stableCount = 0;
			this.stableCountMax = 3000;

			this.frameCapacity = 6;
			this.frame = [];
			this.frameLength = 5;
			this.frameOffset = 0;

			this.frameHitCapacity = 11;
			this.frameHit = [];//打击后的n帧

			for(var i = 0;i<this.frameCapacity;++i){
				var o = new Object();
				o.acc = new o0.Vector2(0,0);
				o.gyr = new o0.Vector2(0,0);
				
				o.timeGap = 20;
				o.accFixed = 0;
				o.accSlope = 0;

				o.pos = new o0.Vector2(0,0);
				o.predict = new o0.Vector2(0,0);

				o.shake = 0;
				o.shakeFixed = 0;
				o.shakeSlope = 0;

				o.hit = 0;
				this.frame.push(o);
			}
		}
		//这个函数不建议外部调用
		GetDirection(){
            var direction = new o0.Vector2(0,0);
			var directionDistance = 0.0;
			for (var fi = 0;fi < this.frameHit.length - 1;++fi) {
				for (var li = fi + 1;li < this.frameHit.length;++li) {
					var newDirection = this.frameHit[li].gyr - this.frameHit[fi].gyr;
					var newDirectionDistance = newDirection.length;
					if (directionDistance < newDirectionDistance) {
						directionDistance = newDirectionDistance;
						direction = newDirection.multiply(this.frameHit[this.frameHit.length -1].time - this.frameHit[0].time);
					}
					else {
						//cout << "false" << endl;
					}
				}
			}
			return direction;
		}
		// 输入俯视的平面坐标系下的xy轴坐标 的 加速计向量/陀螺仪向量。
		// timeGap 代表当前帧读取传感器与上一帧读取传感器 之间的时间差
		Update(accX, accY, gyrX,gyrY,timeGap,callback){
			var rawAcc = new o0.Vector2(accX,accY);
			var rawGyr = new o0.Vector2(gyrX,gyrY);

			let lastFrame = this.frame[(this.frameOffset + this.frameLength - 1) % this.frameCapacity];
			let last2Frame = this.frame[(this.frameOffset + this.frameLength - 2) % this.frameCapacity];
			let last3Frame = this.frame[(this.frameOffset + this.frameLength - 3) % this.frameCapacity];
			let last4Frame = this.frame[(this.frameOffset + this.frameLength - 4) % this.frameCapacity];
			let last5Frame = this.frame[(this.frameOffset + this.frameLength - 5) % this.frameCapacity];
			var newFrame = this.frame[(this.frameOffset + this.frameLength) % this.frameCapacity];

			newFrame.timeGap = timeGap;

			newFrame.acc = rawAcc.minus(this.stableAcc);
			newFrame.gyr = rawGyr.minus(this.stableGyr);

			if (this.stableCount < this.stableCountMax){
				this.stableCount += 1;
			}
			this.stableAcc = this.stableAcc.multiply((this.stableCount - 1.0) / this.stableCount).plus(rawAcc.multiply(1/this.stableCount));
			this.stableGyr = this.stableGyr.multiply((this.stableCount - 1.0) / this.stableCount).plus(rawGyr.multiply(1/this.stableCount));
			//////////////////////////////////////////////////////////////////////////////////
			newFrame.accFixed = newFrame.acc.length * 100;

			if(newFrame.accFixed < lastFrame.accFixed * 0.85){
				newFrame.accFixed = lastFrame.accFixed * 0.85;
			}
			lastFrame.accFixed = Math.max(lastFrame.accFixed, Math.min(newFrame.accFixed,last2Frame.accFixed), Math.min(newFrame.accFixed,last3Frame.accFixed));
			///////////////////////////////////////////////////////////////////////
			//newFrame.pos = lastFrame.pos.plus(lastFrame.acc.plus(newFrame.acc).multiply(timeGap/60)).multiply(Math.max(1-timeGap/200,0));
			newFrame.pos = lastFrame.pos.plus(newFrame.acc.multiply(timeGap/30)).multiply(Math.max(1-timeGap/1000,0));
			////////////////////////////////////////////
			newFrame.accSlope = Math.max(newFrame.accFixed-lastFrame.accFixed,0);


			var lastI = this.frame.length-1;
			var t2 = this.frame[lastI-1].timeGap;
			var t3 = this.frame[lastI].timeGap + t2;
			var t4 = newFrame.timeGap + t3;
			
			newFrame.predict = new o0.Vector2(
				new o0.QuadraticEquation(0,this.frame[lastI-2].pos.x,t2,this.frame[lastI-1].pos.x,t3,this.frame[lastI].pos.x).y(t4),
				new o0.QuadraticEquation(0,this.frame[lastI-2].pos.y,t2,this.frame[lastI-1].pos.y,t3,this.frame[lastI].pos.y).y(t4));/** */

			newFrame.shake = o0.distance2(newFrame.predict,newFrame.pos) * 100;


			if(isNaN(newFrame.shake)){
				newFrame.shake = 0.0;
			}
			
			newFrame.shakeFixed = lastFrame.shakeFixed * 0.85;
			if(newFrame.shake > newFrame.shakeFixed){
				newFrame.shakeFixed = newFrame.shake;
			}/* */
			lastFrame.shakeFixed = Math.max(lastFrame.shakeFixed, Math.min(newFrame.shakeFixed,last2Frame.shakeFixed), Math.min(newFrame.shakeFixed,last3Frame.shakeFixed));
			////////////////////////////////////////////////////////////////
			newFrame.shakeSlope = Math.max(newFrame.shakeFixed-lastFrame.shakeFixed,0);
			///////////////////////////////////////////////////////////////

			var direction = new o0.Vector2(0,0);

			if(lastFrame.hit==0
				&& last2Frame.hit==0
				&& last3Frame.hit==0
				&& last4Frame.hit==0
				&& last5Frame.hit==0
				&& (newFrame.accSlope >= 15 || lastFrame.accSlope >= 20)
				&& (newFrame.shakeSlope >= 20 || lastFrame.shakeSlope >= 40)){
				newFrame.hit = 1;
				if (this.frameHit.length < this.frameHitCapacity) {
					direction = this.GetDirection();
				}/**/
				this.frameHit = [];
				var o = new Object();
				o.time = 0;
				o.gyr = lastFrame.gyr;
				this.frameHit.push(o);
			}else{
				newFrame.hit = 0;
			}

			if (this.frameHit.length < this.frameHitCapacity) {
				var o = new Object();
				o.time = this.frameHit[this.frameHit.length - 1].time + newFrame.timeGap;
				o.gyr = newFrame.gyr; 
				if (this.frameHit.length == this.frameHitCapacity) {
					direction =  this.GetDirection();
				}
			}
			if ((this.frameOffset+=1) >= this.frameCapacity){
				this.frameOffset -= this.frameCapacity;
			}
			
			if(newFrame.hit != 0){
				console.log(newFrame.hit, direction);
			}
			return (newFrame.hit, direction);
		}
        test(){
            return "123123131";
        }
    }
};