using System;
using System.Collections;
using System.Collections.Generic;
using BITKit;
using MeshCombineStudio;
using UnityEngine;

namespace BITFALL.OpenWorld
{
	public class RuntimeChunkCombineService<T> : MonoBehaviour
	{
		public static RuntimeChunkCombineService<T> Singleton { get; private set; }
		public void Register(GameObject root)
		{
			_Roots.Add(root);
			_IsDirty = true;
		}

		public void UnRegister(GameObject root)
		{
			_Roots.Remove(root);
			_IsDirty = true;
		}

		private readonly List<GameObject> _Roots = new();
		[SerializeField] private MeshCombiner meshCombiner;
		private bool _IsDirty;

		[SerializeReference, SubclassSelector] private ITicker ticker;

		private void Awake()
		{
			Singleton = this;
		}

		private void Start()
		{
			ticker.Add(Tick);
			destroyCancellationToken.Register(Dispose);
			_Roots.AddRange(meshCombiner.searchOptions.parentGOs);
		}

		private void Dispose()
		{
			ticker.Remove(Tick);
		}

		private void Tick(float obj)
		{
			if (!_IsDirty) return;
			meshCombiner.ClearMeshCombineJobs();
			meshCombiner.searchOptions.parentGOs = _Roots.ToArray();
			meshCombiner.CombineAll();
		}
	}
}