using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityAsync;
using System;
using System.Threading;
public class DynamicLine : MonoBehaviour
{
    // Start is called before the first frame update

    public LineRenderer lineRenderer;

    public int splitNum = 60;

    public Action<int> OnTouchIndex;
    private CancellationTokenSource cancellationTokenSource;  // 用于取消上一个任务

    private void Start()
    {
        lineRenderer = GetComponent<LineRenderer>();
    }

    public async void SetDynamicPoint(List<Vector3> pos)
    {
        // 如果有正在进行的操作，取消它
        if (cancellationTokenSource != null)
        {
            cancellationTokenSource.Cancel();
        }

        // 创建一个新的 CancellationTokenSource 用于新的操作
        cancellationTokenSource = new CancellationTokenSource();
        CancellationToken token = cancellationTokenSource.Token;

        if (pos.Count > 0)
        {
            int currentIndex = 0;
            await new UnityAsync.WaitForSeconds(1.0f);
            OnTouchIndex?.Invoke(currentIndex);

            // 遍历点，检查是否被取消
            for (currentIndex = 0; currentIndex < pos.Count - 1; currentIndex++)
            {
                lineRenderer.positionCount = currentIndex + 2;
                Vector3 startPos = pos[currentIndex];
                Vector3 endPos = pos[currentIndex + 1];
                Vector3 delta = endPos - startPos;
                Vector3 eachDelta = delta / splitNum;

                for (int i = 0; i < splitNum; i++)
                {
                    // 检查是否取消了当前操作
                    if (token.IsCancellationRequested)
                    {
                        return;  // 取消操作，退出方法
                    }

                    lineRenderer.SetPosition(currentIndex, startPos);
                    lineRenderer.SetPosition(currentIndex + 1, startPos + eachDelta * i);
                    await new WaitForEndOfFrame();
                    await new WaitForEndOfFrame();
                    await new WaitForEndOfFrame();
                    await new WaitForEndOfFrame();
                    await new WaitForEndOfFrame();
                }
                OnTouchIndex?.Invoke(currentIndex + 1);
            }
        }
    }
}