using System;
using System.Collections.Generic;
using Logic.CrashSight;
using UnityEngine;


public class Timer
{
    public static Timer Instance { get; private set; }

    private List<TimerTask> tasks = new List<TimerTask>();  // 存储所有定时任务

    private class TimerTask
    {
        public object target;        // 目标对象 A
        public Action method;        // 方法 B
        public float executeTime;   // 任务执行时间（Time.time + C 毫秒） 
        public string errorMessage;
    }

    public Timer()
    {
        Instance = this;
    }

    // 注册定时任务
    public void TimerRegister(object A, Action B, float C,string message)
    {
        if (B == null) return;
        if (IsTargetDestroyed(A)) return;
        tasks.Add(new TimerTask
        {
            target = A,
            method = B,
            executeTime = Time.time + C,
            errorMessage = message
        });
    }

    public void CancelByTarget(object target)
    {
        if (target == null) return;
        for (int i = tasks.Count - 1; i >= 0; i--)
        {
            if (ReferenceEquals(tasks[i].target, target))
                tasks.RemoveAt(i);
        }
    }

    public void CancelByMessage(string message)
    {
        if (string.IsNullOrEmpty(message)) return;
        for (int i = tasks.Count - 1; i >= 0; i--)
        {
            if (tasks[i].errorMessage == message)
                tasks.RemoveAt(i);
        }
    }

    public void Clear()
    {
        tasks.Clear();
    }

    public void Update()
    {
        if (tasks.Count == 0) return;

        float currentTime = Time.time;
        var i = tasks.Count - 1;
        while (i >= 0)
        {
            if (i >= tasks.Count)
            {
                i = tasks.Count - 1;
                continue;
            }

            var task = tasks[i];
            if (IsTargetDestroyed(task.target))
            {
                tasks.RemoveAt(i);
                i = Math.Min(i - 1, tasks.Count - 1);
                continue;
            }

            if (currentTime >= task.executeTime)
            {
                try 
                { 
                    task.method?.Invoke(); 
                }
                catch (Exception e) 
                {
                    LogSystem.LogError($"Timer任务执行异常:\n" +
                        $"错误信息: {task.errorMessage}\n" +
                        $"异常类型: {e.GetType()}\n" +
                        $"异常信息: {e.Message}\n" +
                        $"调用堆栈: {e.StackTrace}\n" +
                        $"目标对象: {(task.target != null ? task.target.GetType().Name : "null")}"
                    );
                }
                
                var taskIndex = tasks.IndexOf(task);
                if (taskIndex >= 0) tasks.RemoveAt(taskIndex);         // 执行完毕后移除
            }

            i = Math.Min(i - 1, tasks.Count - 1);
        }
    }

    private static bool IsTargetDestroyed(object target)
    {
        if (target is UnityEngine.Object unityObject)
            return unityObject == null;
        return false;
    }
}