import { Component, v3, Vec3, _decorator, Node } from "cc";


const { ccclass, property, executeInEditMode } = _decorator;

/**
 * 跟随脚本，挂载跟随的节点上(单个节点保持偏移的方式)
 */
@ccclass
//@executeInEditMode
export class FollowOffset extends Component {

    @property(Node)
    private target: Node = null;

    @property(Vec3)
    private offset: Vec3 = v3();

    @property
    private offsetAngle: number = 0;

    _isPause = false;

    // oldParent: Node = null;

    // protected onEnable(): void {
    //     this.oldParent = this.node.parent;
    // }

    // protected onDisable(): void {
    //     this.node.parent = this.oldParent;
    // }

    protected update(dt: number): void {
        if (this.target.isValid && !this._isPause) {
            this.updatePos();
        }
    }

    updatePos() {
        let p = this.target.worldPosition;
        this.node.worldPosition = v3(p.x + this.offset.x, p.y + this.offset.y, p.z + this.offset.z);
        this.node.angle = this.target.angle + this.offsetAngle;
    }

    setTarget(target: Node, offset: Vec3 = null) {
        this.target = target;
        this.updatePos();
        if (offset)
            this.offset = offset;
    }

    pause() {
        this._isPause = true;
    }

    resume() {
        this._isPause = false;
    }
}