using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using BITKit;
using BITKit.Entities;
using BITKit.Entities.Player;
using Cysharp.Threading.Tasks;
using JetBrains.Annotations;
using NodeCanvas.DialogueTrees;
using UnityEngine;
using UnityEngine.InputSystem;

namespace BITFALL.UX
{
	/// <summary>
	/// 对话组件,基于NodeCanvas.DialogueTrees
	/// </summary>
	public class UXDialogue : MonoBehaviour
	{
		[SerializeReference,SubclassSelector] private IPlayerService playerService;
		[SerializeField] private UXBuilder dialogueBuilder;
		[SerializeField] private InputActionReference[] choosesActions;

		private readonly ValidHandle allowBackground = new();
		private readonly List<int> _dialogueIds = new();

		[Inject] private InputActionGroup _inputActionGroup;

		[CanBeNull] private MultipleChoiceRequestInfo _multipleChoiceRequestInfo;
		
		private void Start()
		{
			allowBackground.AddListener(dialogueBuilder.VisualElement.SetActive);
			allowBackground.Invoke();
			
			playerService.OnPlayerInitialized += OnPlayerInitialized;
			playerService.OnPlayerDisposed += OnPlayerDisposed;
			
			DialogueTree.OnSubtitlesRequest += OnSubtitlesRequest;
			DialogueTree.OnMultipleChoiceRequest += OnMultipleChoiceRequest;
			
			destroyCancellationToken.Register(() =>
			{
				playerService.OnPlayerInitialized -= OnPlayerInitialized;
				DialogueTree.OnSubtitlesRequest -= OnSubtitlesRequest;
				DialogueTree.OnMultipleChoiceRequest -= OnMultipleChoiceRequest;
				playerService.OnPlayerDisposed -= OnPlayerDisposed;
			});

		
			
		}
		private void OnPlayerDisposed(Entity obj)
		{
			foreach (var action in choosesActions)
			{
				UXOnScreenPrompts.Release(action.GetKeyMap());
			}
		}

		private void OnPlayerInitialized(Entity obj)
		{
			obj.Inject(this);
			
			for (var i = 0; i < choosesActions.Length; i++)
			{
				var action = choosesActions[i];
				var index = i;
				
				_inputActionGroup.RegisterCallback(action, OnAction);
				
				continue;
			
				void OnAction(InputAction.CallbackContext context)
				{
					if (_multipleChoiceRequestInfo is null) return;
					_multipleChoiceRequestInfo.SelectOption?.Invoke(index);
					_multipleChoiceRequestInfo = null;
				}
			}
		}

		private void OnMultipleChoiceRequest(MultipleChoiceRequestInfo obj)
		{
			_multipleChoiceRequestInfo = obj;
			foreach (var (statement,index) in obj.options)
			{
				UXOnScreenPrompts.Get(choosesActions[index].GetKeyMap(),statement.text);
				obj.SelectOption+=i =>
				{
					UXOnScreenPrompts.Release(choosesActions[index].GetKeyMap());
				};
			}
		}

		private async void OnSubtitlesRequest(SubtitlesRequestInfo obj)
		{
			
			var id = obj.GetHashCode();
			
			
			_dialogueIds.Add(id);
			
			dialogueBuilder.VisualElement.SetActive(true);
			var container = dialogueBuilder.BuildAsContainer();
			container.contextLabel.text = $"{obj.actor.name}:{obj.statement}";
			var tags = obj.statement.meta.ToLower().Split(",");
			try
			{
				var skip = tags.Contains("skip");
				if (double.TryParse( obj.statement.meta,out var duration))
				{
					await Task.Delay(TimeSpan.FromSeconds(duration), destroyCancellationToken);
				}
				else if(skip is false)
				{
					await Task.Delay(5000, destroyCancellationToken);
				}
				obj.Continue.Invoke();
				await Task.Delay(5000, destroyCancellationToken);
				container.visualElement.AddToClassList("dispose");
				await Task.Delay(1000, destroyCancellationToken);
				container.visualElement.RemoveFromHierarchy();
			}
			catch (OperationCanceledException)
			{
				obj.Continue.Invoke();
			}

			_dialogueIds.Remove(id);
		}

		private void Update()
		{
			allowBackground.SetElements(this, _dialogueIds.Count is not 0);
		}
	}

}