using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace BITKit.SceneManagement
{
	/// <summary>
	/// 场景服务,负责场景的加载和卸载
	/// </summary>
	public interface ISceneService
	{
		/// <summary>
		/// 在场景加载完成后,是否初始化主场景
		/// </summary>
		bool InitializeMainSceneOnLoad { get; }
		public UniTask LoadSceneAsync(string sceneName,CancellationToken cancellationToken, LoadSceneMode loadSceneMode = LoadSceneMode.Additive, bool activateOnLoad = true);
		/// <summary>
		/// 开始加载场景的回调
		/// </summary>
		event Action<string> OnLoadScene;
		/// <summary>
		/// 加载场景进度的回调
		/// </summary>
		event Action<string,float> OnSceneLoadProgress; 
		/// <summary>
		/// 场景加载完成的回调
		/// </summary>
		event Action<string> OnSceneLoaded;
	}
	/// <summary>
	/// 场景服务代理实现,主要用于快速继承
	/// </summary>
	public abstract class SceneServiceImplement:ISceneService
	{
		protected abstract ISceneService _sceneServiceImplementation { get; }
		public bool InitializeMainSceneOnLoad => _sceneServiceImplementation.InitializeMainSceneOnLoad;

		public UniTask LoadSceneAsync(string sceneName,CancellationToken cancellationToken, LoadSceneMode loadSceneMode = LoadSceneMode.Additive,
			bool activateOnLoad = true)
		{
			return _sceneServiceImplementation.LoadSceneAsync(sceneName,cancellationToken, loadSceneMode, activateOnLoad);
		}

		public event Action<string> OnLoadScene
		{
			add => _sceneServiceImplementation.OnLoadScene += value;
			remove => _sceneServiceImplementation.OnLoadScene -= value;
		}

		public event Action<string, float> OnSceneLoadProgress
		{
			add => _sceneServiceImplementation.OnSceneLoadProgress += value;
			remove => _sceneServiceImplementation.OnSceneLoadProgress -= value;
		}

		public event Action<string> OnSceneLoaded
		{
			add => _sceneServiceImplementation.OnSceneLoaded += value;
			remove => _sceneServiceImplementation.OnSceneLoaded -= value;
		}
	}
}