using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using BITKit;
using Cysharp.Threading.Tasks;
using NodeCanvas.DialogueTrees;
using UnityEngine;

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

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

		private void Start()
		{
			allowBackground.AddListener(dialogueBuilder.VisualElement.SetActive);
			allowBackground.Invoke();
			destroyCancellationToken.Register(() =>
			{
				DialogueTree.OnSubtitlesRequest -= OnSubtitlesRequest;
			});
		}

		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}";
			try
			{
				if (double.TryParse( obj.statement.meta,out var duration))
				{
					await Task.Delay(TimeSpan.FromSeconds(duration), destroyCancellationToken);
				}
				else
				{
					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);
		}
	}

}