using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;
using UnityEngine.Events;
using Sirenix.OdinInspector;
using Cysharp.Threading.Tasks;
using System.Threading;
using System.Threading.Tasks;
using System.Linq;
namespace BITKit.UX
{
    public interface IWindowElement
    {
        string GetName();
        UXElement Navigation { get; }
        UXElement Window { get; }
        UXWindowManager SubWindowManager { get; }
        Task Open(CancellationToken cancellationToken = default);
        Task Close(CancellationToken cancellationToken = default);
    }
    [System.Serializable]
    public class UXWindowElement : IWindowElement
    {
        [SerializeField]
        protected string name;
        [SerializeField]
        protected UXElement navigation;
        [SerializeField]
        protected UXElement window;
        [SerializeField]
        protected UXWindowManager subWindowManager;
        [SerializeField]
        protected bool enabled;
        public UXElement Navigation => navigation;
        public UXElement Window => window;
        public UXWindowManager SubWindowManager => subWindowManager;
        public async Task Close(CancellationToken cancellationToken = default)
        {
            try
            {
                await UniTask.SwitchToMainThread(cancellationToken);
                cancellationToken.ThrowIfCancellationRequested();
                await UniTask.Yield();
                try
                {
                    navigation.GetVisualElement().SetEnabled(true);
                }
                catch (System.Exception)
                {
                    Debug.LogWarning($"Navgation:{name} 已丢失");
                    throw;
                }
                try
                {
                    window.Set(false);
                }
                catch (System.Exception)
                {
                    Debug.LogWarning($"Window:{name} 已丢失");
                    throw;
                }
                enabled = false;
            }
            catch (System.Exception)
            {
                Debug.LogWarning(name);
                throw;
            }
        }

        public async Task Open(CancellationToken cancellationToken = default)
        {
            await UniTask.SwitchToMainThread(cancellationToken);
            cancellationToken.ThrowIfCancellationRequested();
            navigation.GetVisualElement().SetEnabled(false);
            window.Set(true);
            enabled = true;
        }
        public string GetName() => name;


    }
    public class UXWindowManager : MonoBehaviour, INextble
    {
        public enum WindowState
        {
            None,
            Flex,
            Hidden
        }
        [Header(Constant.Header.Components)]
        [SerializeReference, SubclassSelector] public List<IWindowElement> windows = new();
        public UXWindowManager subWindowManager;
        [Header(Constant.Header.Settings)]
        public UXElement startElement;
        [SerializeField] bool hidden;
        [Header(Constant.Header.Events)]
        public UnityEvent<string> OnEntry = new();
        public UnityEvent<string> OnExit = new();
        [Header(Constant.Header.InternalVariables)]
        List<IWindowElement> activeWindows = new();
        IWindowElement activeWindow;
        public int index { get; private set; }
        CancellationTokenSource cts;
        public async void Select(UXElement element)
        {
            cts.Cancel();
            cts = new();
            foreach (var activeWindow in activeWindows)
            {
                await activeWindow.Close(cts.Token);
                OnExit.Invoke(activeWindow.GetName());
            
            }

            activeWindows.Clear();
            var window = windows
            .Find(x => x.GetName() == element.name || x.Navigation == element || x.Window == element);
            index = windows.IndexOf(window);
            activeWindows.Add(window);
            activeWindow = window;
            // currentWindow = window;
            try
            {
                await window.Open();
            }
            catch (System.Exception)
            {
                Debug.LogWarning(name);
                if (window is null)
                {
                    Debug.Log("Window is Null");
                }
                throw;
            }

            OnEntry.Invoke(window.GetName());
        }
        public bool Next()
        {
            if (activeWindow is not null && activeWindow.SubWindowManager)
            {
                if (activeWindow.SubWindowManager.Next())
                {
                    return true;
                }
            }
            if (windows.Count > index + 1)
            {
                var element = windows[index + 1].Navigation;
                Select(element);
            }
            else
            {
                return false;
            }
            return true;
        }

        public bool Previous()
        {
            if (activeWindow is not null && activeWindow.SubWindowManager)
            {
                if (activeWindow.SubWindowManager.Previous())
                {
                    return true;
                }
            }
            if (index - 1 >= 0)
            {
                var element = windows[index - 1].Navigation;
                Select(element);
                return true;
            }
            return false;
        }
        public bool Hidden
        {
            get => hidden;
            set
            {
                if (hidden)
                {
                    Exit();
                }
                else
                {
                    Recovery();
                }
            }
        }
        public void Exit()
        {
            hidden = true;
            activeWindow?.Close();
        }
        public void Recovery()
        {
            hidden = false;
            activeWindow?.Open();
        }
        void Awake()
        {
            cts = new();
            var ct = gameObject.GetCancellationTokenOnDestroy();
            ct.Register(cts.Cancel);
        }
        async void Start()
        {
            await UniTask.Yield();
            foreach (var window in windows)
            {
                await window.Close(cts.Token);
            }
            Select(startElement);
        }
    }
}