using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using Prism.Mvvm;
using System.Threading.Tasks;
using System.Windows.Controls;
using Prism.Commands;
using LampInspectionMachine.Log4xml;
using LampInspectionMachine.Model;
using Prism.Events;
using Prism.Ioc;
using Prism.Regions;
using LampInspectionMachine.Views;
using System.Windows.Media;
using System.Threading;
using System.Windows;

namespace LampInspectionMachine.ViewModels
{
    public  class RoleLoginViewModel:BindableBase
    {
        private AppData _appData;
        private IContainerProvider _container;
        private IEventAggregator _eventAggregator;
        private IRegionManager _regionManager;
        private Brush _brush= Brushes.Transparent;
        private string loginstr="";


        private DelegateCommand<RoleLoginView> _LoginCommand;
        public DelegateCommand<RoleLoginView> LogoutCommand =>
            _LoginCommand ?? ( _LoginCommand = new DelegateCommand<RoleLoginView>(OnRoleLogin) );
        private Users loginUser=new Users(){  Role= Roles.操作员     };
        public Users LoginUser { get => loginUser; set { SetProperty(ref loginUser, value); } }

        private  List<string> rolesList=new List<string>(){ Roles.操作员.ToString(),Roles.工程师.ToString(),Roles.管理员.ToString() };

        private  string _CurrRole="操作员";
        public RoleLoginViewModel(IContainerProvider container, IRegionManager regionManager, IEventAggregator eventAggregator) 
        {
            _container = container;
            _eventAggregator = eventAggregator;
            _regionManager = regionManager;
            _appData=_container.Resolve<AppData>();
        }
        void OnRoleLogin(RoleLoginView view)
        {
            loginUser.Password=SecureStringToString(Password);
            if ( loginUser.CheckUserLogin(loginUser, _appData) )
            {
                L_Brush = Brushes.Green;
                Loginstr = "登录成功";
                LogHelper.Info("登录成功");
                Task task=  Task.Run(() =>
                {
                    Thread.Sleep(1000);
                    Application.Current.Dispatcher.Invoke(new Action(() =>
                    {
                        view.Close();
                    }));
                });
               
                
               
            }
            else
            {
                L_Brush = Brushes.Red;
                Loginstr = "登录失败";
                Task task=  Task.Run(() =>
                {
                    Thread.Sleep(1000);
                    L_Brush = Brushes.Transparent;
                    Loginstr = "";
                });
                LogHelper.Info("登录失败");
            }


        }



        public DelegateCommand<object> PasswordChangedCommand => new DelegateCommand<object>(PasswordChanged);
        // 密码变量
        private SecureString _password;

        public SecureString Password
        {
            get
            {
                return _password;
            }
            set
            {
                // 如果新值与旧值不同
                if ( _password != value )
                {
                    // 更新密码

                    // 触发属性更改通知，通知UI层密码已更改
                    SetProperty(ref _password, value);
                }
            }
        }

        public string CurrRole { get => _CurrRole;
            set
            {
                SetProperty(ref _CurrRole, value);
                LoginUser.Role = ( Roles ) Enum.Parse(typeof(Roles), CurrRole);
            }
        }

        public List<string> RolesList { get => rolesList; set { SetProperty(ref rolesList, value); } }

        public Brush L_Brush { get => _brush; set { SetProperty(ref _brush, value); } }

        public string Loginstr { get => loginstr; set { SetProperty(ref loginstr, value); } }

        private void PasswordChanged(object parameter)
        {
            var passwordBox = parameter as PasswordBox;
            if ( passwordBox != null )
            {
                // 设置 ViewModel 中的密码属性
                Password = passwordBox.SecurePassword;
            }
        }


        /// <summary>
        /// 将 SecureString 类型的数据转换为普通的字符串类型。
        /// </summary>
        /// <param name="secureString">要转换的 SecureString 对象。</param>
        /// <returns>转换后的字符串，如果转换失败则返回空字符串。</returns>
        private string SecureStringToString(SecureString secureString)
        {
            // 初始化指针
            IntPtr ptr = IntPtr.Zero;
            try
            {
                // 将 SecureString 转换为指针
                ptr = Marshal.SecureStringToGlobalAllocUnicode(secureString);

                if ( ptr != IntPtr.Zero )
                {
                    // 将指针中的数据复制到一个普通的字符串
                    return Marshal.PtrToStringUni(ptr);
                }
                else
                {
                    return string.Empty;
                }
            }
            catch ( Exception ex )
            {
                // 处理异常
                Console.WriteLine($"转换 SecureString 出错：{ex.Message}");
                return string.Empty;
            }
            finally
            {
                // 清除内存中的敏感数据
                if ( ptr != IntPtr.Zero )
                {
                    Marshal.ZeroFreeGlobalAllocUnicode(ptr);
                }
            }
        }
    }
}