using System;
using System.Collections;
using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using Quadtree;
#if UNITY_EDITOR
using UnityEditor.SceneManagement;
#endif
using UnityEngine;
using UnityEngine.SceneManagement;
using YooAsset;

namespace BITKit.OpenWorld
{
	public class WorldTerrainBehaviour : MonoBehaviour,IWorldChunkObject
	{
		public static UniTaskCompletionSource WaitUntilInitialized = new();
		[SerializeReference, SubclassSelector] private IReference sceneName;
		[SerializeField] private Vector3 size;
		[SerializeField] private Vector3 position;
		[SerializeField, ReadOnly] private int lod = -1;
		private SceneHandle _sceneHandle;
		[BIT]
		public async void Load()
		{
			if (_sceneHandle is not null) return;
			var stopWatcher = new System.Diagnostics.Stopwatch();
			stopWatcher.Start();
			_sceneHandle = YooAssets.LoadSceneAsync(sceneName.Value,LoadSceneMode.Additive,priority:8);
			try
			{
				await _sceneHandle.WithCancellation(destroyCancellationToken);
			}
			catch (OperationCanceledException)
			{
		
			}
		
			stopWatcher.Stop();
			Debug.Log($"加载场景 {sceneName.Value} 耗时 {stopWatcher.ElapsedMilliseconds}ms");
		}
		[BIT]
		public async void Unload()
		{
			if (_sceneHandle is null) return;
			var stopWatcher = new System.Diagnostics.Stopwatch();
			stopWatcher.Start();
			await _sceneHandle.UnloadAsync();
			_sceneHandle = null;
			stopWatcher.Stop();
			Debug.Log($"卸载场景 {sceneName.Value} 耗时 {stopWatcher.ElapsedMilliseconds}ms");
		}

		public Bounds GetBounds()=>
			new Bounds(position, size);

		public Node<IWorldChunkObject> ParentNode { get; set; }
		public void QuadTree_Root_Initialized(IQuadtreeRoot<IWorldChunkObject, Node<IWorldChunkObject>> root)
		{
		}
		public int Id { get; set; }

		public int Lod
		{
			get=>lod;
			set
			{
				lod = value;
				switch (value)
				{
					case 0:
						Load();
						break;
					default:
						Unload();
						break;
				}
			}
		}

		private void Start()
		{
			WorldTerrainService.Singleton.Register(this);
			destroyCancellationToken.Register(() => WorldTerrainService.Singleton.Unregister(this));
		}

		private void OnDrawGizmosSelected()
		{
			Gizmos.color = Color.red;
			Gizmos.DrawWireCube(position, size);
		}
	}

}