using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using TMPro;
using UnityEngine;

public enum TrafficLightState
{
    Red,
    Yellow,
    Green
}

public class TrafficLightManager : MonoBehaviour
{
    [System.Serializable]
    public class TrafficLightGroup
    {
        public List<TMP_Text> lights = new List<TMP_Text>();
        public bool startsWithGreen; // 标记组是从绿灯开始还是红灯开始
        public float timer; // 计时器
        public TrafficLightState currentState;
        public TrafficLightState previousState; // 新增字段，用于保存黄灯之前的状态
        public List<GameObject> trafficLights = new List<GameObject>();

        public void Initialize()
        {
            // 绿灯开始则设为10秒，否则设为39秒
            currentState = startsWithGreen ? TrafficLightState.Green : TrafficLightState.Red;
            previousState = currentState; // 初始化时，之前的状态与当前状态相同

            timer = startsWithGreen ? 10f : 39;
        }

        public void UpdateTrafficLightTexture(TrafficLightState state)
        {
            // Debug.Log("123");

            foreach (var light in trafficLights)
            {
                if (light != null)
                {
                    // 假设你有一个方法来根据状态获取相应的贴图
                    //Texture newTexture = GetTextureForState(state);
                    light.transform.Find("red2").GetComponent<MeshRenderer>().material.DisableKeyword("_EMISSION");
                    light.transform.Find("yellow1").GetComponent<MeshRenderer>().material.DisableKeyword("_EMISSION");
                    light.transform.Find("green2").GetComponent<MeshRenderer>().material.DisableKeyword("_EMISSION");
                }
            }

            switch (state)
            {
                case TrafficLightState.Red:
                    foreach (var light in trafficLights)
                    {
                        if (light != null)
                        {
                            // 假设你有一个方法来根据状态获取相应的贴图
                            //Texture newTexture = GetTextureForState(state);
                            light.transform.Find("red2").GetComponent<MeshRenderer>().material.EnableKeyword("_EMISSION");
                        }
                    }

                    break;
                case TrafficLightState.Yellow:
                    foreach (var light in trafficLights)
                    {
                        if (light != null)
                        {
                            // 假设你有一个方法来根据状态获取相应的贴图
                            //Texture newTexture = GetTextureForState(state);
                            light.transform.Find("yellow1").GetComponent<MeshRenderer>().material.EnableKeyword("_EMISSION");
                        }
                    }

                    break;
                case TrafficLightState.Green:
                    foreach (var light in trafficLights)
                    {
                        if (light != null)
                        {
                            // 假设你有一个方法来根据状态获取相应的贴图
                            //Texture newTexture = GetTextureForState(state);
                            light.transform.Find("green2").GetComponent<MeshRenderer>().material.EnableKeyword("_EMISSION");
                        }
                    }
                    AddRedLightWarning();
                    break;
                default:
                    throw new ArgumentOutOfRangeException(nameof(state), state, null);
            }
        }

        // private Texture GetTextureForState(TrafficLightState state)
        // {
        //     // 返回根据 state 获取的贴图
        //     // 这里你需要根据你的资源来实现具体的逻辑
        // }
    }

    public List<TrafficLightGroup> lightGroups;

    void Start()
    {
        // 初始化每组红绿灯的计时器
        foreach (var group in lightGroups)
        {
            group.Initialize();
        }
    }


    void FixedUpdate()
    {
        // Debug.Log("Delta Time: " + Time.deltaTime);
        foreach (var group in lightGroups)
        {
            // Debug.Log("Before: " + group.timer);
            // group.timer -= Time.deltaTime;
            // Debug.Log("After: " + group.timer);

            // 更新红绿灯状态
            UpdateTrafficLightGroup(group);
        }
    }

    void AddRedLightWarning(TrafficLightGroup group)
    {
        // 在这里添加提示或更改状态的逻辑
        // 例如，你可以在红灯状态下播放声音或显示警告信息

        // 以下是一个示例，在控制台输出警告信息：
        Debug.LogWarning("红灯警告：请注意停车！");
    }
    
    void UpdateTrafficLightGroup(TrafficLightGroup group)
    {
        group.timer -= Time.deltaTime;

        if (group.timer <= 0f)
        {
            switch (group.currentState)
            {
                case TrafficLightState.Green:
                    group.previousState = TrafficLightState.Green;
                    group.currentState = TrafficLightState.Yellow;
                    group.timer = 3f; // 绿灯到黄灯的持续时间
                    break;

                case TrafficLightState.Yellow:
                    group.currentState = TrafficLightState.Red;
                    group.timer = group.startsWithGreen ? 39 : 20; // 黄灯到红灯的持续时间
                    break;

                case TrafficLightState.Red:
                    group.previousState = TrafficLightState.Red;
                    group.currentState = TrafficLightState.Green;
                    group.timer = 10f; // 红灯到绿灯的持续时间
                    break;
            }
        }

        // 更新交通灯显示
        UpdateLights(group.lights, group.currentState.ToString(), group.timer);

        group.UpdateTrafficLightTexture(group.currentState);
    }


    void UpdateLights(List<TMP_Text> lights, string state, float time)
    {
        int timeInt = Mathf.CeilToInt(time);
        // 使用条件运算符来判断是否需要在前面加上 0
        string formattedTime = timeInt < 10 ? "0" + timeInt.ToString() : timeInt.ToString();
        string text = formattedTime;
        Color color = Color.white;

        switch (state)
        {
            case "Red":
                color = Color.red;
                break;
            case "Yellow":
                color = Color.yellow;
                break;
            case "Green":
                color = Color.green;
                break;
        }

        foreach (var light in lights)
        {
            if (light != null)
            {
                light.text = text;
                light.color = color;
            }
        }
    }
}