using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public abstract class BasePanel : MonoBehaviour
{
    private CanvasGroup _canvasGroup;   

    private float alphaSpeed = 10;

    private bool isShow;

    private UnityAction hideCallback;
    
    [Header("面板设置")]
    public bool AllowBackButton = true; // 是否允许返回按钮关闭
    public bool IsModal = false; // 是否为模态面板

    protected virtual void Awake(){
        _canvasGroup = GetComponent<CanvasGroup>();
        if (_canvasGroup == null)
        {
            _canvasGroup = gameObject.AddComponent<CanvasGroup>();
        }
    }

    protected virtual void Start(){   
        Init();
    }

    public abstract void Init();

    public virtual void ShowMe(bool isFade = true){
        isShow = true;
        if(isFade){
            _canvasGroup.alpha = 0;
        }else{
            _canvasGroup.alpha = 1;
        }
    }

    public virtual void HideMe(bool isFade =true ,UnityAction callback = null){
        isShow = false;
        if(isFade){
            _canvasGroup.alpha = 1;
        }else{
            _canvasGroup.alpha = 0;
        }
        hideCallback = callback;
    }

    void Update(){
        if(isShow&&_canvasGroup.alpha!=1){
            _canvasGroup.alpha +=alphaSpeed*Time.deltaTime;
            if(_canvasGroup.alpha>=1){
                _canvasGroup.alpha = 1;
            }
        }else if(!isShow){
            _canvasGroup.alpha -=alphaSpeed*Time.deltaTime;
            if(_canvasGroup.alpha<=0){
                _canvasGroup.alpha = 0;
                hideCallback?.Invoke();
            }
        }
        
        // 处理返回键
        HandleBackButton();
    }
    
    /// <summary>
    /// 处理返回按钮逻辑
    /// </summary>
    protected virtual void HandleBackButton()
    {
        if (AllowBackButton && Input.GetKeyDown(KeyCode.Escape))
        {
            OnBackButtonPressed();
        }
    }
    
    /// <summary>
    /// 返回按钮被按下时的处理
    /// 可以被子类重写以实现自定义逻辑
    /// </summary>
    protected virtual void OnBackButtonPressed()
    {
        // 默认行为：关闭当前面板
        ClosePanel();
    }
    
    /// <summary>
    /// 关闭当前面板
    /// </summary>
    protected virtual void ClosePanel()
    {
        // 使用UIManagerAdapter来避免命名冲突
        UIManager.Instance.GoBack();
    }
    
    /// <summary>
    /// 返回主界面
    /// </summary>
    protected void ReturnToHome()
    {
        EnhancedUIManager.Instance.ReturnToHome();
    }
}