// 文件位置: TH1_Presentation/Sequencer/Task/UISequencerTask.cs
using System;
using TH1_UI.Controller.Announce;
using TH1_UI.Controller.Base;
using TH1_UI.Core;
using UnityEngine;

namespace TH1_Presentation.Sequencer.Task
{
    /// <summary>
    /// 一个专门用于按顺序显示 UI (ViewController) 的任务。
    /// </summary>
    public class UISequencerTask : ISequencerTask
    {
        private readonly IViewControllerInterface _viewController;
        private readonly object _data; // 用于传递给UI的数据，可以是任何类型
        private Action _onCompleteCallback; // 保存来自 PresentationManager 的完成回调
        private bool _callbackRegistered = false;
        
        /// <summary>
        /// 创建一个UI显示任务。
        /// </summary>
        /// <param name="viewController">要显示的UI的控制器实例。</param>
        /// <param name="data">可选，需要传递给UI的数据（例如，包含标题和内容的自定义类或元组）。</param>
        public UISequencerTask(IViewControllerInterface viewController, object data = null)
        {
            if (viewController == null)
            {
                throw new ArgumentNullException(nameof(viewController), "UISequencerTask cannot be created with a null ViewController.");
            }
            _viewController = viewController;
            _data = data;
        }

        public object GetData()
        {
            return _data;
        }

        public Type GetControllerType()
        {
            return _viewController.GetType();
        }
        public string GetDescString()
        {
            return "UISequencerTask : " + _viewController.GetType().ToString();
        }

        /// <summary>
        /// 执行任务：打开UI，并等待其关闭。
        /// </summary>
        public void Execute(Action onComplete)
        {
            // 1. 保存 PresentationManager 的完成回调
            _onCompleteCallback = onComplete;
            // 添加调试日志
            //Debug.Log($"[TASK] Execute: {_viewController.Name}. Subscribing 'OnViewClosed'. Callback is currently '{(object)_viewController.OnClosedCallback ?? "null"}'.");
            // 2. 注册自己的回调到 ViewController 的关闭事件上
            _viewController.OnClosedCallback += OnViewClosed;
            _callbackRegistered = true;
            // 添加调试日志
            //Debug.Log($"[TASK] After Subscribe: {_viewController.Name}. Callback is now '{(object)_viewController.OnClosedCallback ?? "null"}'.");
    
            // 3. 打开界面
            if (_data != null)
                _viewController.OpenWithParam(_data);
            else 
                _viewController.Open();
        }
        private void OnViewClosed()
        {
            // step #1 在通知前，立刻注销自己的回调
            if (_callbackRegistered)
            {
                _viewController.OnClosedCallback -= OnViewClosed;
                _callbackRegistered = false;
            }
            //_viewController.OnClosedCallback -= OnViewClosed;
            
            // step #2. 通知 PresentationManager 任务已完成
            _onCompleteCallback?.Invoke();
        }
        
        public IViewControllerInterface GetController()
        {
            return _viewController;
        }

        /// <summary>
        /// 检查是否可以通过Esc/右键关闭
        /// </summary>
        public bool CanCloseByEsc()
        {
            if (_viewController is IEscClosable closable)
                return closable.CanCloseByEsc();
            return false; // 默认可关闭
        }

        public void CancelMapHighlights()
        {
            if (_viewController is IEscClosable closable)
                closable.CancelMapHighlightsOrDoNothing();
        }
    }
    
    
    
}