using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Threading;
using System.Threading.Tasks;
using Aitex.Common.Util;
using Aitex.Core.Account;
using Aitex.Core.RT.Event;
using Aitex.Core.RT.Log;
using Aitex.Core.Util;
using Aitex.Core.WCF;
using MECF.Framework.Common.Account.Extends;
using MECF.Framework.Common.Equipment;

namespace MECF.Framework.Common.Account
{
	public class AccountExManager : Singleton<AccountExManager>
	{
		#region Variables

		private readonly Dictionary<string, LoginResult> _dicLoginNameToLoginResult = new();
		private readonly Dictionary<string, LoginResult> _dicTokenToLoginResult = new();

		private readonly string _scAccountTemplateFile = PathManager.GetCfgDir() + "Account//Account.xml";
		private readonly string _scAccountLocalFile = PathManager.GetCfgDir() + "Account//_AccountEx.xml";

		// 旧的_Account.xml文件路径，为兼容已有的账户配置。
		private readonly string _oldAccountXmlFile = PathManager.GetCfgDir() + "Account//_Account.xml";

		private readonly object _syncRoot = new();

		#endregion

		#region COnstructors

		public AccountExManager()
		{
			// 默认不允许多用户登录
			IsSupportMultiUserLogin = false;
		}

		#endregion

		#region Properties

		/// <summary>
		/// 返回角色加载器。
		/// </summary>
		public RoleLoader RoleLoader { get; private set; }

		/// <summary>
		/// 返回是否支持多用户登录RT。
		/// </summary>
		private bool IsSupportMultiUserLogin { get; }

		#endregion

		#region Methods

		/// <summary>
		/// 初始化当前对象。
		/// </summary>
		/// <param name="enableService"></param>
		/// <exception cref="ApplicationException"></exception>
		public void Initialize(bool enableService)
		{
			if (!File.Exists(_scAccountLocalFile))
			{
				if (File.Exists(_oldAccountXmlFile))
				{
					// 如果已存在_Account.xml，则从_Account.xml创建_AccountEx.xml文件。
					File.Copy(_oldAccountXmlFile, _scAccountLocalFile);
					Thread.Sleep(10);
				}
				else if (File.Exists(_scAccountTemplateFile))
				{
					File.Copy(_scAccountTemplateFile, _scAccountLocalFile);
					Thread.Sleep(10);
				}

				// 模板文件不存在
				throw new ApplicationException("Can not initialize account configuration file, " +
				                               _scAccountTemplateFile);

			}

			RoleLoader = new RoleLoader(_scAccountLocalFile);
			RoleLoader.Load();

			if (enableService)
			{
				Singleton<WcfServiceManager>.Instance.Initialize(new Type[1] { typeof(AccountService) });
			}
		}

		private RemoteEndpointMessageProperty GetCurrentEndPoint()
		{
			var context = OperationContext.Current;
			var prop = context.IncomingMessageProperties;
			var endpoint =
				prop[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
			return endpoint;
		}


		private CancellationTokenSource cts;
		
		public async Task<LoginRequestResults> RequestLogin()
		{
			if (cts is { IsCancellationRequested: false })
				throw new InvalidOperationException("some user is requesting login, try again later.");
			
			cts = new CancellationTokenSource();
			var token = cts.Token;
			return await Task.Run(async () =>
			{
				await Task.Delay(5000, token);
				cts = null;
				return LoginRequestResults.Rejected;
			}, token);
		}
		
		public void CancelLoginRequest()
		{
			cts?.Cancel();
		}

		public LoginResult AuthLogin(string loginName, string password, string role, LoginClientInfo clientInfo)
		{
			lock (_syncRoot)
			{
				var endPoint = GetCurrentEndPoint();

				var loginResult = new LoginResult
				{
					ActSucc = true,
					Token = Guid.NewGuid().ToString(),
					LoginIP = endPoint.Address,
					LoginPort = endPoint.Port,
					LoginTime = DateTime.Now
				};

				try
				{
					var accountList = RoleLoader.AccountList;
					var accountEx = accountList.FirstOrDefault(x => x.LoginName == loginName);
					if (accountEx == null)
					{
						loginResult.ActSucc = false;
						loginResult.Description = AuthorizeResult.NoMatchUser.ToString();
					}
					else
					{
						var matchedAccount = accountList.FirstOrDefault(x => x.LoginName == loginName);
						if (matchedAccount == null)
						{
							// 登录失败，当前账户不在指定的角色中。
							loginResult.ActSucc = false;
							loginResult.Description = AuthorizeResult.NoMatchUser.ToString();
							return loginResult;
						}

						if (matchedAccount.Password != password)
						{
							// 登录失败，密码错误
							loginResult.ActSucc = false;
							loginResult.Description = AuthorizeResult.WrongPwd.ToString();
							return loginResult;
						}

						// 查找当前用户的登录角色是否存在
						foreach (var roleId in matchedAccount.RoleIDs)
						{
							if (roleId == role)
							{
								// 用户名、密码、角色匹配，进入登录流程
								loginResult.ActSucc = true;
								loginResult.AccountEx = matchedAccount;
								loginResult.Description = AuthorizeResult.None.ToString();

								if (IsSupportMultiUserLogin)
								{
									// 如果支持多用户登录，并且相同账号异地登录，则踢掉已登录的客户端。
									if (_dicLoginNameToLoginResult.TryGetValue(loginName, out var loggedInfo))
									{
										_dicTokenToLoginResult.Remove(loggedInfo.Token);
										_dicLoginNameToLoginResult.Remove(loginName);

										EV.PostLoginBySameUser(new Credential(loggedInfo.Token, loginName));
									}
								}
								else
								{
									// 如果不支持多用户登录，则踢掉所有已登录的客户端。
									foreach (var user in _dicLoginNameToLoginResult)
										EV.PostLoginBySameUser(new Credential(user.Value.Token, user.Key));

									_dicTokenToLoginResult.Clear();
									_dicLoginNameToLoginResult.Clear();
								}

								_dicLoginNameToLoginResult[loginName] = loginResult;
								_dicTokenToLoginResult[loginResult.Token] = loginResult;
								EV.PostMessage(ModuleName.System.ToString(), EventEnum.UserLoggedIn, loginResult);
								return loginResult;

							}
						}

						// 登录失败，当前账户不在指定的角色中。
						loginResult.ActSucc = false;
						loginResult.Description = AuthorizeResult.NoMatchRole.ToString();
						return loginResult;
					}
				}
				catch (Exception ex)
				{
					LOG.Error(ex.Message, ex);
				}

				return loginResult;
			}
		}

		internal void Logout(string sessionId)
		{
			lock (_syncRoot)
			{
				if (_dicTokenToLoginResult.TryGetValue(sessionId, out var loginResult))
				{
					EV.PostMessage(ModuleName.System.ToString(), EventEnum.UserLoggedOff,
						_dicLoginNameToLoginResult[loginResult.AccountEx.LoginName]);
					_dicLoginNameToLoginResult.Remove(loginResult.AccountEx.LoginName);
					_dicTokenToLoginResult.Remove(sessionId);
				}
			}
		}

		#endregion
	}
}