using UnityEngine;
using System.Collections.Generic;

public static class ActionHistory
{
    public enum ActionType
    {
        Shose,
        ChanraoTuibu,
        PingFirst,
        PingSecond,
        Woman
    }

    public class HistoryItem
    {
        public ActionType Type;
        public MonoBehaviour Handler;
        public int ExtraInt;
    }

    public static Stack<HistoryItem> History = new Stack<HistoryItem>();

    public static bool TryUndoLast()
    {
        if (History.Count == 0) return false;
        var item = History.Pop();
        
        if (item.Type == ActionType.Shose)
        {
            var h = item.Handler as ShoseClickHandler;
            if (h != null) h.ResetState();
        }
        else if (item.Type == ActionType.ChanraoTuibu)
        {
            var h = item.Handler as ChanraoTuibuHandler;
            if (h != null) h.ResetState();
        }
        else if (item.Type == ActionType.PingSecond)
        {
            var h = item.Handler as PingClickHandler;
            if (h != null) h.UndoSecondClick();
            
            // 撤销对 UI 步骤的影响
            var sm = Object.FindObjectOfType<StepManager>();
            if (sm != null) sm.DecrementPingStep();
        }
        else if (item.Type == ActionType.PingFirst)
        {
            var h = item.Handler as PingClickHandler;
            if (h != null)
            {
                if (h.nextPing != null) h.nextPing.SetActive(false);
                else 
                {
                    var allPings = Object.FindObjectsOfType<PingClickHandler>();
                    foreach (var p in allPings) { if (p != h) p.UndoShow(); }
                }
                h.ResetState();
            }
            
            var sm = Object.FindObjectOfType<StepManager>();
            if (sm != null) sm.DecrementPingStep();
        }
        else if (item.Type == ActionType.Woman)
        {
            var sm = Object.FindObjectOfType<StepManager>();
            if (sm != null) sm.DecrementWomanStep();
            
            // 隐藏下一个小球并恢复当前小球
            var h = item.Handler as TouchPositionHandler;
            if (h != null)
            {
                if (h.nextTouchObject != null) h.nextTouchObject.SetActive(false);
                h.gameObject.SetActive(true);
                var mr = h.GetComponent<MeshRenderer>();
                if (mr != null) mr.enabled = true;
            }
        }
        
        return true;
    }
}