using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Enumerations;
using Tango.Core.Commands;
using Tango.Core.Cryptography;
using Tango.Core.DI;
using Tango.MachineStudio.Common;
using Tango.MachineStudio.Common.Authentication;
using Tango.MachineStudio.Common.EventLogging;
using Tango.MachineStudio.Common.Navigation;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.Common.Web;
using Tango.MachineStudio.UI.Authentication;
using Tango.MachineStudio.UI.Messages;
using Tango.Settings;
using Tango.SharedUI;
using Tango.Web;
using SimpleValidator.Extensions;
using Tango.BL.Entities;
using System.Data.Entity;
using Tango.MachineStudio.Common.Buid;
using System.Diagnostics;

namespace Tango.MachineStudio.UI.ViewModels
{
    /// <summary>
    /// Represents the Machine Studio login view, view model.
    /// </summary>
    /// <seealso cref="Tango.SharedUI.ViewModel" />
    public class LoginViewVM : ViewModel
    {
        private IAuthenticationProvider _authenticationProvider;
        private INavigationManager _navigationManager;
        private INotificationProvider _notificationProvider;
        private IEventLogger _eventLogger;
        private Rfc2898Cryptographer cryptographer;
        private MachineStudioSettings _settings;
        private MachineStudioWebClient _machineStudioWebClient;
        private TaskCompletionSource<object> _updatePasswordCompletionSource;
        private IBuildProvider _buildProvider;

        private String _email;
        /// <summary>
        /// Gets or sets the email.
        /// </summary>
        [Required(ErrorMessage = "Email is required")]
        [EmailAddress(ErrorMessage = "Please enter a valid email")]
        public String Email
        {
            get { return _email; }
            set { _email = value; RaisePropertyChangedAuto(); }
        }

        private String _password;
        /// <summary>
        /// Gets or sets the password.
        /// </summary>
        [Required(ErrorMessage = "Password is required")]
        public String Password
        {
            get { return _password; }
            set { _password = value; RaisePropertyChangedAuto(); }
        }

        private String _serialNumber;
        /// <summary>
        /// Gets or sets the password.
        /// </summary>
        [Required(ErrorMessage = "Serial Number is required")]
        public String SerialNumber
        {
            get { return _serialNumber; }
            set { _serialNumber = value; RaisePropertyChangedAuto(); }
        }

        private DeploymentSlot _deploymentSlot;
        /// <summary>
        /// Gets or sets the deployment slot.
        /// </summary>
        public DeploymentSlot DeploymentSlot
        {
            get { return _deploymentSlot; }
            set { _deploymentSlot = value; RaisePropertyChangedAuto(); }
        }

        private bool _isLogging;
        /// <summary>
        /// Gets or sets a value indicating whether this instance is logging.
        /// </summary>
        public bool IsLogging
        {
            get { return _isLogging; }
            set { _isLogging = value; RaisePropertyChangedAuto(); }
        }

        private bool _showLogginDetails;
        public bool ShowLoggingDetails
        {
            get { return _showLogginDetails; }
            set { _showLogginDetails = value; RaisePropertyChangedAuto(); }
        }


        private bool _rememberMe;
        /// <summary>
        /// Gets or sets a value indicating whether to remember the last user email and password.
        /// </summary>
        public bool RememberMe
        {
            get { return _rememberMe; }
            set { _rememberMe = value; RaisePropertyChangedAuto(); }
        }

        private bool _enableSlotSelection;
        /// <summary>
        /// Gets or sets a value indicating whether to enable the deployment slot selection.
        /// </summary>
        public bool EnableSlotSelection
        {
            get { return _enableSlotSelection; }
            set { _enableSlotSelection = value; RaisePropertyChangedAuto(); }
        }

        private bool _isActiveDirectory;
        public bool IsActiveDirectory
        {
            get { return _isActiveDirectory; }
            set { _isActiveDirectory = value; RaisePropertyChangedAuto(); if (value) IsStandardUser = false; }
        }

        private bool _isStandardUser;
        public bool IsStandardUser
        {
            get { return _isStandardUser; }
            set { _isStandardUser = value; RaisePropertyChangedAuto(); if (value) IsActiveDirectory = false; }
        }

        private String _progressLog;
        public String ProgressLog
        {
            get { return _progressLog; }
            set { _progressLog = value; RaisePropertyChangedAuto(); }
        }

        private bool _isChangingPassword;
        public bool IsChangingPassword
        {
            get { return _isChangingPassword; }
            set { _isChangingPassword = value; RaisePropertyChangedAuto(); }
        }

        private String _newPassword1;
        public String NewPassword1
        {
            get { return _newPassword1; }
            set { _newPassword1 = value; RaisePropertyChangedAuto(); }
        }

        private String _newPassword2;
        public String NewPassword2
        {
            get { return _newPassword2; }
            set { _newPassword2 = value; RaisePropertyChangedAuto(); }
        }

        public List<DeploymentSlot> Environments { get; set; }

        /// <summary>
        /// Gets or sets the login command.
        /// </summary>
        public RelayCommand LoginCommand { get; set; }

        /// <summary>
        /// Gets or sets the update password command.
        /// </summary>
        public RelayCommand UpdatePasswordCommand { get; set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="LoginViewVM"/> class.
        /// </summary>
        /// <param name="authenticationProvider">The authentication provider.</param>
        /// <param name="navigationManager">The navigation manager.</param>
        /// <param name="notificationProvider">The notification provider.</param>
        public LoginViewVM(IBuildProvider buildProvider, MachineStudioWebClient machineStudioWebClient, IAuthenticationProvider authenticationProvider, INavigationManager navigationManager, INotificationProvider notificationProvider, IEventLogger eventLogger)
        {
            EnableSlotSelection = true;
            ShowLoggingDetails = true;

            _machineStudioWebClient = machineStudioWebClient;
            _buildProvider = buildProvider;
            _settings = SettingsManager.Default.GetOrCreate<MachineStudioSettings>();

            if (_buildProvider.BuildType == MSBuildType.Default)
            {
                Environments = Enum.GetValues(typeof(DeploymentSlot)).Cast<DeploymentSlot>().ToList();
            }
            else
            {
                Environments = new List<DeploymentSlot>();

                Environments.Add(DeploymentSlot.DEV);
                Environments.Add(DeploymentSlot.TEST);
                Environments.Add(DeploymentSlot.BETA);
                Environments.Add(DeploymentSlot.PROD);
            }

            _notificationProvider = notificationProvider;
            _navigationManager = navigationManager;
            _authenticationProvider = authenticationProvider;
            _buildProvider = buildProvider;
            _eventLogger = eventLogger;
            LoginCommand = new RelayCommand(Login, () => !IsLogging);
            UpdatePasswordCommand = new RelayCommand(UpdatePassword, () => IsChangingPassword);

            cryptographer = new Rfc2898Cryptographer();
            Email = _settings.LastLoginEmail;
            SerialNumber = _settings.LastLoginSerialNumber;
            DeploymentSlot = _settings.DeploymentSlot;

            RememberMe = _settings.RememberMe;

            if (_settings.LastLoginMethod == LoginMethod.ActiveDirectory)
            {
                IsActiveDirectory = true;
            }
            else
            {
                IsStandardUser = true;
            }

            if (_buildProvider.BuildType == MSBuildType.Lite)
            {
                IsStandardUser = true;
            }


            try
            {
                Password = cryptographer.Decrypt(_settings.LastLoginPassword);
            }
            catch (Exception ex)
            {
                LogManager.Log(ex);
            }
        }

        /// <summary>
        /// Logins the requested user.
        /// </summary>
        private async void Login()
        {
            if (Validate())
            {
                try
                {
                    IsLogging = true;
                    ShowLoggingDetails = false;
                    NewPassword1 = String.Empty;
                    NewPassword2 = String.Empty;

                    InvalidateRelayCommands();

                    LoginMethod loginMethod = IsActiveDirectory ? LoginMethod.ActiveDirectory : LoginMethod.StandardUser;

                    await Task.Factory.StartNew(() =>
                    {
                        _settings.DeploymentSlot = DeploymentSlot;

                        LoginResponse result = _authenticationProvider.Login(Email, Password, loginMethod, _settings.ByPassEnvironmentVersionCheck, (progress) =>
                        {
                            ProgressLog = progress;
                        }, SerialNumber).Response;

                        if (result.VersionChangeRequired && !_settings.ByPassEnvironmentVersionCheck)
                        {
                            InvokeUI(() =>
                            {
                                if (_notificationProvider.ShowErrorQuestion($"Your version of Machine Studio is different from the version specified for the selected environment.\nMachine Studio must be changed to version '{result.RequiredVersion}' in order to continue.\nDo you wish to update your local version?"))
                                {
                                    TangoMessenger.Default.Send(new ChangeVersionMessage()
                                    {
                                        LoginResponse = result,
                                    });
                                    _navigationManager.NavigateTo(NavigationView.UpdateView);
                                }
                            });

                            return;
                        }

                        if (result.PasswordChangeRequired)
                        {
                            StartUpdatePassword().Task.GetAwaiter().GetResult();
                            Password = NewPassword1;
                            Login();
                            return;
                        }

                        //_eventLogger.Log(EventTypes.APPLICATION_STARTED, "Application Started!");

                        _navigationManager.NavigateTo(NavigationView.MainView);

                        _settings.LastLoginEmail = Email;
                        _settings.RememberMe = RememberMe;
                        _settings.LastLoginMethod = loginMethod;
                        _settings.LastLoginPassword = RememberMe ? cryptographer.Encrypt(Password) : null;
                        _settings.LastLoginSerialNumber = SerialNumber;
                        _settings.Save();

                        EnableSlotSelection = false;

                        IsLogging = false;
                        ShowLoggingDetails = true;
                        IsChangingPassword = false;
                        InvalidateRelayCommands();

                        InvokeUI(() =>
                        {
                            MainWindow.Instance.Title += $" - {_settings.DeploymentSlot}";
                        });

                    });
                }
                catch (Exception ex)
                {
                    IsLogging = false;
                    ShowLoggingDetails = true;
                    IsChangingPassword = false;
                    InvalidateRelayCommands();
                    LogManager.Log(ex, "Login Error.");
                    _notificationProvider.ShowError($"An error occurred while trying to perform the log-in operation.\n{ex.FlattenMessage()}");
                }
            }
        }

        private TaskCompletionSource<object> StartUpdatePassword()
        {
            _updatePasswordCompletionSource = new TaskCompletionSource<object>();

            IsChangingPassword = true;
            ShowLoggingDetails = false;
            IsLogging = false;
            InvalidateRelayCommands();

            return _updatePasswordCompletionSource;
        }

        private async void UpdatePassword()
        {
            await Task.Factory.StartNew(() =>
            {
                try
                {
                    if (!Validate())
                    {
                        return;
                    }

                    ProgressLog = "Updating your password...";
                    IsChangingPassword = false;
                    IsLogging = true;
                    InvalidateRelayCommands();

                    using (var db = ObservablesContext.CreateDefault())
                    {
                        var user = db.Users.SingleOrDefault(x => x.Email == Email);
                        user.PasswordChangeRequired = false;
                        user.Password = User.GetPasswordHash(NewPassword1);
                        db.SaveChanges();
                    }

                    _updatePasswordCompletionSource.SetResult(true);
                }
                catch (Exception ex)
                {
                    IsLogging = false;
                    IsChangingPassword = false;
                    ShowLoggingDetails = true;
                    InvalidateRelayCommands();
                    _updatePasswordCompletionSource.SetException(ex);
                }
                finally
                {
                    InvalidateRelayCommands();
                }
            });
        }

        protected override void OnValidating()
        {
            if (IsChangingPassword)
            {
                if (!NewPassword1.IsBetweenLength(6, 8))
                {
                    InsertError(nameof(NewPassword1), "Password must be 6 to 8 characters long");
                }

                if (NewPassword1 != NewPassword2)
                {
                    InsertError(nameof(NewPassword2), "Passwords do not match");
                }
            }

            base.OnValidating();
        }
    }
}