using System.Threading;
using UnityEngine;
using System.Threading.Tasks;

public enum TurnSignalState
{
    左转向,
    右转向,
    双闪,
    空
}

public class TurnSignalController : MonoBehaviour
{
    public GameObject leftTurnSignal;
    public GameObject rightTurnSignal;
    public GameObject rightTurnSignalGame;
    public GameObject leftTurnSignalGame;
    private Task currentBlinkTask = null;
    private CancellationTokenSource cancellationTokenSource;
    private int currentSignalType = 0; // 当前的信号类型


    public GameObject HighBeamLight;
    public GameObject LowBeamLight;

    public GameObject leftTurnSignal2;
    public GameObject rightTurnSignal2;

    public TurnSignalState turnSignalState;
    public void SetSignal(int signalType)
    {
        // 如果当前信号类型与请求的信号类型相同，则不执行任何操作
        if (currentSignalType == signalType)
        {
            return;
        }

        currentSignalType = signalType; // 更新当前信号类型

        // 取消当前的动画任务（如果存在）
        if (cancellationTokenSource != null)
        {
            cancellationTokenSource.Cancel();
            cancellationTokenSource.Dispose();
            
            
            // HighBeamLight.SetActive(false);
            // LowBeamLight.SetActive(false);
            // rightTurnSignalGame.SetActive(false);
            // leftTurnSignalGame.SetActive(false);
        }

        turnSignalState = TurnSignalState.空;
        cancellationTokenSource = new CancellationTokenSource();

        switch (signalType)
        {
            case 1: // 左转向灯
                turnSignalState = TurnSignalState.左转向;
                currentBlinkTask = BlinkSignalAsync(leftTurnSignal, leftTurnSignal2,leftTurnSignalGame,cancellationTokenSource.Token);
                rightTurnSignal.SetActive(false);
                break;
            case 2: // 右转向灯
                turnSignalState = TurnSignalState.右转向;
                currentBlinkTask = BlinkSignalAsync(rightTurnSignal, rightTurnSignal2,rightTurnSignalGame,cancellationTokenSource.Token);
                leftTurnSignal.SetActive(false);
                break;
            case 3: // 双闪灯
                turnSignalState = TurnSignalState.双闪;
                currentBlinkTask = BlinkBothSignalsAsync(cancellationTokenSource.Token);
                break;
            // case 4://远光灯
            //     HighBeamLight.SetActive(true);
            //     break;
            // case 5://近光灯
            //     LowBeamLight.SetActive(true);
            //     break;
            // case 0: // 全部停止
            //     StopAllSignals();
            //     break;
        }
    }

    public void OpenLight()
    {
        HighBeamLight.SetActive(true);
    }
    public void CloseLight()
    {
        HighBeamLight.SetActive(false);
    }

    private async Task BlinkSignalAsync(GameObject signal,GameObject signal2, GameObject sinGame,CancellationToken ct)
    {
        bool isOn = false;

        try
        {
            while (!ct.IsCancellationRequested)
            {
                isOn = !isOn;
                signal.SetActive(isOn);
                signal2.SetActive(isOn);
                sinGame.SetActive(isOn);
                await Task.Delay(500, ct); // 等待500毫秒
            }
        }
        catch (TaskCanceledException)
        {
            // 任务被取消时执行
        }

        signal.SetActive(false); // 确保灯光关闭
        signal2.SetActive(false);
        sinGame.SetActive(false);
    }

    private async Task BlinkBothSignalsAsync(CancellationToken ct)
    {
        bool isOn = false;

        try
        {
            while (!ct.IsCancellationRequested)
            {
                isOn = !isOn;
                leftTurnSignal.SetActive(isOn);
                rightTurnSignal.SetActive(isOn);
                
                leftTurnSignal2.SetActive(isOn);
                rightTurnSignal2.SetActive(isOn);
                
                rightTurnSignalGame.SetActive(isOn);
                leftTurnSignalGame.SetActive(isOn);
                
                rightTurnSignalGame.SetActive(isOn);
                leftTurnSignalGame.SetActive(isOn);
                await Task.Delay(500, ct); // 等待500毫秒 
            }
        }
        catch (TaskCanceledException)
        {
            // 任务被取消时执行
        }

        leftTurnSignal.SetActive(false);
        rightTurnSignal.SetActive(false);
        
        leftTurnSignal2.SetActive(false);
        rightTurnSignal2.SetActive(false);
    }

    public void StopAllSignals()
    {
        if (cancellationTokenSource != null)
        {
            cancellationTokenSource.Cancel();
            cancellationTokenSource.Dispose();
        }

        leftTurnSignal.SetActive(false);
        rightTurnSignal.SetActive(false);
        
        leftTurnSignal2.SetActive(false);
        rightTurnSignal2.SetActive(false);
    }
}