import { _decorator, Component, Node, Enum, Vec2, Vec3, v3, EventHandler } from 'cc';
const { ccclass, property } = _decorator;

export enum WalkTargetType {
    Line,
    Random
}
export enum WalkDeleyDataType {
    Const,
    Random
}
export enum WalkDeleyType {
    Step,
    Round
}

@ccclass("WalkDeleyData")
export class WalkDeleyData {
    @property({
        type: Enum(WalkDeleyDataType),
        tooltip: "延迟类型：\nConst:固定时间\nRandom：随机时间"
    })
    type: WalkDeleyDataType = WalkDeleyDataType.Const;
    @property({
        tooltip: "延迟时间（常量）", visible() {
            return this.type == WalkDeleyDataType.Const;
        }
    })
    private deley_const: number = 0;
    @property({
        tooltip: "延迟时间（随机值）", visible() {
            return this.type == WalkDeleyDataType.Random;
        }
    })
    private deley_random: Vec2 = new Vec2();

    public get deley(): number {
        if (this.type == WalkDeleyDataType.Const) {
            return this.deley_const;
        } else if (this.type == WalkDeleyDataType.Random) {
            return this.random(this.deley_random.x, this.deley_random.y);
        }
        return 0;
    }

    private random(min: number, max: number): number {
        return min + Math.random() * (max - min);
    }
}

@ccclass('TakeAWalk')
export class TakeAWalk extends Component {
    @property({ type: [Node], tooltip: "散步目标点" }) points: Array<Node> = [];
    @property({ tooltip: "速度系数(每帧)" }) speed = 1;

    @property({
        type: Enum(WalkTargetType),
        tooltip: "散步目标选择方式：\nLine：根据目标点集合，逐个前往\nRandom：在目标点集合中随机选择前往"
    }) walkTargetType: WalkTargetType = WalkTargetType.Random;

    @property({
        type: Enum(WalkDeleyType),
        tooltip: "散步延迟方式：\nStep：每到一个点开始延迟（随机目标，固定使用这个方式）\nRound：所有目标点都经过后开始延迟",
        visible() {
            return this.walkTargetType == WalkTargetType.Line;
        }
    }) deleyType: WalkDeleyType = WalkDeleyType.Step;
    @property({
        tooltip: "线性行走完成后是否循环",
        visible() {
            return this.walkTargetType == WalkTargetType.Line;
        }
    }) loop: boolean = true;
    @property({
        type: EventHandler, tooltip: "非循环模式，完成后的回调",
        visible() {
            return this.walkTargetType == WalkTargetType.Line && !this.loop;
        }
    }) complete: EventHandler;

    @property({
        type: WalkDeleyData, tooltip: "散步延迟数据"
    }) deley: WalkDeleyData = new WalkDeleyData();

    @property({ tooltip: "初始化时是否设置散步节点到第一个目标点位置" }) resetPosOnLoad = false;
    @property({ tooltip: "是否初始化后开始移动" }) walkOnLoad = false;


    private curPointIndex = -1;
    private walkTotleFarme = 0;
    private beenStop = false;
    /**当前目标点 */
    public curTargetPoint: Vec3;
    /**当前状态 */
    public state: WalkState = WalkState.Stop;
    start() {
        if (this.resetPosOnLoad) {
            this.curPointIndex = 0;
            this.node.setPosition(this.points[this.curPointIndex].position);
        }
        if (this.walkTargetType == WalkTargetType.Random) {
            this.deleyType = WalkDeleyType.Step;
        }
        this.walkOnLoad && this.walk();
    }

    public walk(): void {
        this.beenStop = false;
        this.next(0);
    }

    public stop(): void {
        this.beenStop = true;
        this.state = WalkState.Stop;
    }

    private next(deley: number = -1): void {
        if (this.walkTargetType == WalkTargetType.Random) {
            this.curPointIndex = this.random_int(0, this.points.length - 1);
        } else {
            this.curPointIndex++;
            if (this.curPointIndex >= this.points.length) {
                if (this.loop) {
                    this.curPointIndex = 0;
                } else {
                    this.curPointIndex = -1;
                    this.stop();
                    this.complete && this.complete.emit(null);
                    return;
                }
            }
        }
        let d = 0;
        if (this.deleyType == WalkDeleyType.Step || (this.deleyType == WalkDeleyType.Round && this.curPointIndex == 0)) {
            d = this.deley.deley;
        }
        deley >= 0 && (d = deley);
        this.curTargetPoint = this.points[this.curPointIndex].position;
        let distance = Vec3.distance(this.node.position, this.curTargetPoint);
        this.walkTotleFarme = distance / this.speed;
        this.scheduleOnce(() => {
            this.state = WalkState.Walk;
        }, d);
    }

    update() {
        if (this.state == WalkState.Walk && !this.beenStop) {
            let angle = Math.atan2(this.curTargetPoint.y - this.node.position.y, this.curTargetPoint.x - this.node.position.x);
            let x = Math.cos(angle) * this.speed;
            let y = Math.sin(angle) * this.speed;
            this.node.setPosition(this.node.position.add(v3(x, y, 0)));
            this.walkTotleFarme--;
            if (this.walkTotleFarme <= 0) {
                this.node.setPosition(this.curTargetPoint);
                this.next();
                this.state = WalkState.Stop;
            }
        }
    }

    private random_int(min: number, max: number): number {
        return min + Math.round(Math.random() * (max - min))
    }
}

export enum WalkState {
    Walk,
    Stop,
}