@ccclass
export default class Game extends cc.Component {
    // 木桩（投掷目标）节点
    @property(cc.Node)
    targetNode:cc.Node = null
    // 小刀（投掷物示意）节点
    @property(cc.Node)
    knifeNode:cc.Node = null
    //小刀预制件
    @property(cc.Prefab)
    knifePrefab:cc.Prefab = null
    // 已投出的小刀列表
    knifeList:cc.Node[] = []
    // 当前是否可以投掷
    canThrow:boolean = true
    // 旋转速度
    rotateSpeed:number = 150
    // 旋转半径（木桩半径）
    rotateRadius:number = 0
    onLoad () {
        // 点击屏幕，触发丢出飞刀事件
        this.node.on(cc.Node.EventType.TOUCH_START, this.throwKnife, this)
        this.rotateRadius = this.targetNode.width / 2
    }
    onDestroy(): void {
        // 销毁飞刀事件
        this.node.off(cc.Node.EventType.TOUCH_START, this.throwKnife, this)
    }
    // 每隔2s进行变速
    changeSpeed(){
        let dir = Math.random() > 0.5? 1: -1
        let speedNum = Math.max(200, Math.abs(this.rotateSpeed) + 150 * (Math.random() - 0.5))
        if(speedNum > 200){
            speedNum -= Math.random() * 150
        }
        this.rotateSpeed = dir * speedNum
    }

    // 丢出飞刀
    throwKnife(){
        if(this.canThrow) {
            this.canThrow = false
            this.targetNode.zIndex = 1
            let action = cc.sequence(
                // 垂直飞到木桩的圆周上
                cc.moveTo(0.15, new cc.Vec2(this.knifeNode.x, this.targetNode.y - this.targetNode.height / 2)),
                cc.callFunc(()=>{
                    // 判定是否和已经插在上面的飞刀碰撞：遍历knifeList，判断是否有旋转角小于gap的小刀
                    let isHit = this.knifeList.some(knife=>{
                        let gap = 5
                        let angle = Math.abs(knife.angle)
                        return angle < gap || (360 - angle) < gap
                    })
                    // 当检查到小刀旋转的角度小于5时，判定撞击
                    if(isHit){
                        // 弹回
                        let action = cc.sequence(
                            cc.spawn(
                                cc.moveTo(0.5, this.knifeNode.x, -cc.winSize.height),
                                cc.rotateBy(0.5, -360)
                            ),
                            cc.callFunc(()=>{
                                // 游戏重新开始
                                cc.director.loadScene('game')
                            })
                        )
                        this.knifeNode.runAction(action)
                    }else{
                        // 没有碰撞，创建一把新的小刀，代替knifeNode插在上面，knifeNode复位
                        this.canThrow = true
                        let newKnife = cc.instantiate(this.knifePrefab)
                        newKnife.setPosition(this.knifeNode.position)
                        this.node.addChild(newKnife)
                        this.knifeList.push(newKnife)
                        this.knifeNode.setPosition(new cc.Vec2(0, -300))
                    }
                })
            )
            this.knifeNode.runAction(action)
        }       
    }
    start () {
        // 定时变速
        setInterval(()=>this.changeSpeed(), 2000)
    }
    update (dt) {
        // 木桩旋转
        this.targetNode.angle = (this.targetNode.angle + this.rotateSpeed * dt) % 360
        //小刀和木桩旋转一致，要计算相对木桩圆心的位移位置
        this.knifeList.forEach((knife:cc.Node)=>{
            knife.angle = (knife.angle + this.rotateSpeed * dt) % 360
            let rad = Math.PI * (knife.angle - 90) / 180
            knife.x = this.targetNode.x + this.rotateRadius * Math.cos(rad) 
            knife.y = this.targetNode.y + this.rotateRadius * Math.sin(rad)
            
        })
    }
}