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 CancellationToken _cancellationToken;
		private void Awake()
		{
			DialogueTree.OnSubtitlesRequest += OnSubtitlesRequest;
			_cancellationToken = this.GetCancellationTokenOnDestroy();
		}

		private void Start()
		{
			dialogueBuilder.VisualElement.SetActive(false);
		}

		private async void OnSubtitlesRequest(SubtitlesRequestInfo obj)
		{
			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), _cancellationToken);
				}
				else
				{
					await Task.Delay(5000, _cancellationToken);
				}
				obj.Continue.Invoke();
				await Task.Delay(5000, _cancellationToken);
				container.visualElement.AddToClassList("dispose");
				await Task.Delay(1000, _cancellationToken);
				container.visualElement.RemoveFromHierarchy();
			}
			catch (OperationCanceledException)
			{
				obj.Continue.Invoke();
			}
		}

		private void Update()
		{
			dialogueBuilder.VisualElement.SetActive(dialogueBuilder.VisualElement.childCount > 0);
		}

		private void OnDestroy()
		{
			DialogueTree.OnSubtitlesRequest -= OnSubtitlesRequest;
		}
	}

}