using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Threading;
#if UNITY_5_3_OR_NEWER && UNITY_WINDOW
using AnotherFileBrowser.Windows;
#endif
using BITKit.Mod;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.UX
{
	public class UXModService:UIToolKitPanel,IDisposable
	{
		protected override string DocumentPath => "ux_mod_Service";
		private const string TemplatePath = "ux_mod_service_template";
		public override bool AllowCursor => true;

		public UXModService(IUXService uxService) : base(uxService)
		{
			ModService.OnModInstalled+=OnModInstalled;
			ModService.OnModUnInstalled+=OnModUnInstalled;
			ModService.OnModLoaded+=OnModLoaded;
			ModService.OnModUnLoaded+=OnModUnLoaded;
			ModService.OnLocked+=OnLocked;
		}
		private VisualTreeAsset _modTemplate;
		
		[UXBindPath("open-mod-button")]
		private Button _openModButton;
		[UXBindPath("mods-container")]
		private VisualElement _modsContainer;
		[UXBindPath("return-button")]
		private Button _returnButton;
		[UXBindPath("mod-name-label")]
		private Label _modNameLabel;
		[UXBindPath("mod-description-label")]
		private Label _modDescriptionLabel;
		[UXBindPath("reload-mod-button",true)]
		private Button _reloadModButton;
		
		private readonly ConcurrentDictionary<string,VisualElement> _modContainers=new();

		private void OnLocked(bool obj)
		{
			RootVisualElement?.SetEnabled(!obj);
		}
		public override async UniTask EntryAsync()
		{
			await base.EntryAsync();
			_modTemplate =await ModService.LoadAsset<VisualTreeAsset>(TemplatePath);
			UXUtils.Inject(this);
			if (_openModButton is not null)
			{
				_openModButton.clicked += OpenMod;
			}

			if (_returnButton is not null)
			{
				_returnButton.clicked += UXService.Return;
			}

			_modsContainer.Clear();
			foreach (var x in ModService.Mods)
			{
				OnModInstalled(x);
			}

			if (_reloadModButton is not null)
				_reloadModButton.clicked += async () =>
				{
					_reloadModButton.SetEnabled(false);
					await ModService.Reload();
					await UniTask.SwitchToMainThread();
					_reloadModButton.SetEnabled(true);
				};
		}
		private async void OnModUnInstalled(IMod obj)
		{
			await UniTask.SwitchToMainThread();
			_modContainers.TryRemove(obj.Name, out var container);
			container.RemoveFromHierarchy();
		}

		private async void OnModInstalled(IMod obj)
		{
			await UniTask.SwitchToMainThread();
			var container = _modContainers.GetOrAdd(obj.Name,_=> Create(obj));
			container.RegisterCallback<MouseDownEvent>(x =>
			{
				if (x.button != 1) return;
				ContextMenuBuilder.Create().BuildAction("卸载",  () =>
				{
					ModService.UnLoad(obj);
					ModService.UnInstall(obj);
				}).Build();
			});
		}
		private async void OnModUnLoaded(IMod obj)
		{
			await UniTask.SwitchToMainThread();
			//var container = _modContainers.GetOrAdd(obj.Name,_=> Create(obj));
			if(_modContainers.TryGetValue(obj.Name,out var container))
			{
				container.Get<Toggle>().SetValueWithoutNotify(false);
			}
		}

		private async void OnModLoaded(IMod obj)
		{
			await UniTask.SwitchToMainThread();
			var container = _modContainers.GetOrAdd(obj.Name,_=> Create(obj));
			container.Get<Toggle>().SetValueWithoutNotify(true);
		}

		private static void OpenMod()
		{
			BIT4Log.Log("正在打开选择文件对话框");
#if  UNITY_EDITOR
			new Thread(OpenModInternal).Start();
			#else
			OpenModInternal();
#endif
		
			return;
			void OpenModInternal()
			{
				#if UNITY_5_3_OR_NEWER && UNITY_WINDOW
				BIT4Log.Log<UXModService>("已进入文件对话框线程");
				new FileBrowser().OpenFileBrowser(new BrowserProperties()
				{
					//filterIndex = 0,
					//filter = "C Sharp files (*.cs)|*.cs |Dll files (*.dll)|*.dll",
				}, Filepath);
#else
				throw new NotSupportedException($"{Application.platform} 不支持打开文件对话框");
				#endif
				return;
				async void Filepath(string path)
				{
					BIT4Log.Log<UXModService>("已选择文件:"+path);
					await BITApp.SwitchToMainThread();
					try
					{
						var file = new FileInfo(path);
					
						switch (file.Extension)
						{
							case ".cs":
								#if UNITY_5_3_OR_NEWER
								var code = await File.ReadAllTextAsync(path);
								var assembly = BITSharp.Compile(code);
								await ModService.Load(assembly,Path.GetDirectoryName(path));
#else
								throw new NotSupportedException($"{Application.platform} 不支持编译C#代码");
								#endif
								break;
							case ".dll":
								var bytes = await File.ReadAllBytesAsync(path);
								await ModService.Load(Assembly.Load(bytes),Path.GetDirectoryName(path));
								break;
							case ".json" when file.Name is ModPackage.DefaultFileName:
								await ModService.LoadFromPackage(path);
								break;
							default:
								Alert.Print(new AlertMessage()
								{
									title = "加载失败",
									message = "不支持的文件类型"
								});
								break;
						}
					}
					catch (Exception e)
					{
						Alert.Print(new AlertMessage()
						{
							title = "加载失败",
							message = e.Message
						});
						BIT4Log.LogException(e);
					}
				}
			}
			
		}
		private VisualElement Create(IMod mod)
		{
			var container =_modsContainer.Create(_modTemplate);
			container.Get<Toggle>().RegisterValueChangedCallback(evt =>
			{
				if (evt.newValue)
				{
					ModService.Load(mod);
				}
				else
				{
					ModService.UnLoad(mod);
				}
			});
			container.tooltip = mod.Name+"\n"+mod.Description;
			
			container.Get<Button>().clicked += () =>
			{
				_modNameLabel.text = mod.Name;
				_modDescriptionLabel.text = mod.Description;
			};
			return container;
		}

		public void Dispose()
		{
			ModService.OnModInstalled-=OnModInstalled;
			ModService.OnModUnInstalled-=OnModUnInstalled;
			ModService.OnModLoaded-=OnModLoaded;
			ModService.OnModUnLoaded-=OnModUnLoaded;
			ModService.OnLocked-=OnLocked;
		}
	}

}