import { _decorator, Component, Node, tween, Vec3, Sprite, UITransform } from "cc";
const { ccclass, property } = _decorator;

@ccclass("HintManager")
export class HintManager extends Component {
    @property(Node)
    handNode: Node | null = null; // 编辑器里拖一只手的 sprite 节点

    private runningTween: any = null;

    // 传入 getHint 的结果
    showHint(hint: any, getPos: (r: number, c: number) => Vec3) {
        if (!this.handNode) return;
    
        // 清理之前的动画
        if (this.runningTween) {
            this.runningTween.stop();
            this.runningTween = null;
        }
    
        if (!hint.from || !hint.dir || hint.steps == null) return;
    
        const { from, dir, steps } = hint;
        const dr = dir.dr;
        const dc = dir.dc;
    
        // 生成路径格子（起点 + dir * step）
        const pathCells: { r: number; c: number }[] = [];
        for (let s = 0; s <= steps; s++) {
            pathCells.push({ r: from.r + dr * s, c: from.c + dc * s });
        }
    
        // 转换成 UI 坐标
        const positions: Vec3[] = pathCells.map(cell => getPos(cell.r, cell.c));
    
        const startPos = positions[0];
        this.handNode.active = true;
        this.handNode.setSiblingIndex(this.handNode.parent.children.length - 1);
        this.handNode.setPosition(startPos);
    
        // 构建单向滑动动画（格子之间平均时间）
        const durationPerCell = 1 / steps;
        let tw = tween(this.handNode);
        for (let i = 1; i < positions.length; i++) {
            tw = tw.to(durationPerCell, { position: positions[i] });
        }
    
        // 到终点瞬间回起点
        tw = tw.call(() => this.handNode.setPosition(startPos));
    
        // 重复 3 次
        this.runningTween = tween(this.handNode)
            .repeat(3, tw)
            .call(() => {
                this.handNode.active = false;
                this.runningTween = null;
            })
            .start();
    }

    cancelHint() {
        if (this.runningTween) {
            try {
                this.runningTween.stop();
            } catch (e) {
                console.warn("停止手势动画失败", e);
            }
            this.runningTween = null;
        }
        if (this.handNode) {
            this.handNode.active = false;
        }
    }
    
}