#region License Information
/* HeuristicLab 
 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL) 
 * 
 * This file is part of HeuristicLab. 
 * 
 * HeuristicLab is free software: you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version. 
 * 
 * HeuristicLab is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * GNU General Public License for more details. 
 * 
 * You should have received a copy of the GNU General Public License 
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>. 
 */
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Services.Authentication;
using System.ServiceModel.Security;
using System.ServiceModel;
using HeuristicLab.Core;
using HeuristicLab.Collections;

namespace HeuristicLab.Services.Authentication {
  public class AuthenticationClient {

    private static AuthenticationClient instance;
    public static AuthenticationClient Instance {
      get {
        if (instance == null) instance = new AuthenticationClient();
        return instance;
      }
    }

    #region Properties

    private ItemCollection<User> users;
    public ItemCollection<User> Users {
      get { return users; }
    }
    private ItemCollection<Application> applications;
    public ItemCollection<Application> Applications {
      get { return applications; }
    }

    private ItemCollection<Role> roles;
    public ItemCollection<Role> Roles {
      get { return roles; }
    }

    #endregion


    private AuthenticationClient() {
      applications = new ItemCollection<Application>();
      applications.ItemsRemoved += new CollectionItemsChangedEventHandler<Application>(applications_ItemsRemoved);

      users = new ItemCollection<User>();
      users.ItemsRemoved += new CollectionItemsChangedEventHandler<User>(users_ItemsRemoved);

      roles = new ItemCollection<Role>();
      roles.ItemsRemoved += new CollectionItemsChangedEventHandler<Role>(roles_ItemsRemoved);
    }


    #region Store

    public bool Store(AuthenticationItem item) {
      try {
        if (item.Id == Guid.Empty) {
          if (item is Role)
            item.Id = CallService<Guid>(s => s.AddRole((Role)item));
          else if (item is User)
            item.Id = CallService<Guid>(s => s.AddUser((User)item));
          else if (item is Application)
            item.Id = CallService<Guid>(s => s.AddApplication((Application)item));
        } else {
          if (item is Role)
            CallService(s => s.UpdateRole((Role)item));
          else if (item is User)
            CallService(s => s.UpdateUser((User)item));
          else if (item is Application)
            CallService(s => s.UpdateApplication((Application)item));
        }

        return true;
      }
      catch (Exception ex) {
        //ErrorHandling.ShowErrorDialog("Store failed.", ex);
        return false;
      }
    }

    #endregion

    #region Refresh

    public void Refresh(Guid applicationId) {
      OnRefreshing();

      users.Clear();
      roles.Clear();
      applications.Clear();

      var call = new Func<Exception>(delegate() {
        try {
          applications.AddRange(CallService<Application[]>(s => s.GetApplications()).OrderBy(x => x.Name).ToArray());
          if (!applicationId.Equals(Guid.Empty)) {
            users.AddRange(CallService<User[]>(s => s.GetUsersForApplication(applicationId)).OrderBy(x => x.Name).ToArray());
            roles.AddRange(CallService<Role[]>(s => s.GetRolesForApplication(applicationId)).OrderBy(x => x.Name).ToArray());
          }
          return null;
        }
        catch (Exception ex) {
          return ex;
        }
      });
      call.BeginInvoke(delegate(IAsyncResult result) {
        Exception ex = call.EndInvoke(result);
        if (ex != null) {
          //ErrorHandling.ShowErrorDialog("Refresh failed.", ex);
        }
        OnRefreshed();
      }, null);
    }


    #endregion

    #region Helpers

    private void CallService(Action<IAuthenticationService> call) {
      AuthenticationServiceClient client = new AuthenticationServiceClient();
      client.ClientCredentials.UserName.UserName = "Alice";
      client.ClientCredentials.UserName.Password = "YouWillNeverKnow";
      client.ClientCredentials.ServiceCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.None;
      //AuthenticationServiceClient client = ClientFactory.Create<AuthenticationClient, IAuthenticationService>();
      try {
        call(client);
      }
      finally {
        try {
          client.Close();
        }
        catch (Exception) {
          client.Abort();
        }
      }
    }

    private T CallService<T>(Func<IAuthenticationService, T> call) {
      AuthenticationServiceClient client = new AuthenticationServiceClient();
      client.ClientCredentials.UserName.UserName = "Alice";
      client.ClientCredentials.UserName.Password = "YouWillNeverKnow";
      client.ClientCredentials.ServiceCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.None;
      //AuthenticationServiceClient client = ClientFactory.Create<AuthenticationClient, IAuthenticationService>();
      try {
        return call(client);
      }
      finally {
        try {
          client.Close();
        }
        catch (Exception) {
          client.Abort();
        }
      }
    }

    #endregion

    #region Application methods

    public Application GetApplication(Guid applicationId) {
      try {
        return CallService<Application>(s => s.GetApplication(applicationId));
      }
      catch (Exception ex) {
        //ErrorHandling.ShowErrorDialog("Refresh problem data failed.", ex);
        return null;
      }
    }

    public IEnumerable<Application> GetApplications() {
      try {
        return CallService<IEnumerable<Application>>(s => s.GetApplications());
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return null;

      }
    }



    #endregion

    #region Role Methods

    public Role GetRole(Guid Id) {
      try {
        return CallService<Role>(s => s.GetRole(Id));
      }
      catch (Exception ex) {
        // todo Errorhandling
        return null;
      }
    }

    public IEnumerable<Guid> GetRolesForUser(Guid userId) {
      try {
        return CallService<IEnumerable<Guid>>(s => s.GetRolesForUser(userId));
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return null;
      }
    }


    #endregion

    #region User methods

    public User GetUser(Guid Id) {
      try {
        return CallService<User>(s => s.GetUser(Id));
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return null;
      }
    }

    public IEnumerable<User> GetUsers() {
      try {
        return CallService<IEnumerable<User>>(s => s.GetUsers());
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return null;
      }
    }


    public bool IsUserInRole(Guid userId, Guid roleId) {
      try {
        return CallService<bool>(s => s.IsUserInRole(userId, roleId));
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return false;
      }
    }


    public void AddUserToRole(Guid roleId, Guid userId) {
      try {
        CallService(s => s.AddUserToRole(roleId, userId));
      }
      catch (Exception ex) {
        // Todo Errorhandling

      }
    }

    public void RemoveUserFromRole(Guid roleId, Guid userId) {
      try {
        CallService(s => s.RemoveUserFromRole(roleId, userId));
      }
      catch (Exception ex) {
        // Todo Errorhandling

      }
    }


    public IEnumerable<Guid> GetUsersInRole(Guid roleId) {
      try {
        return CallService<IEnumerable<Guid>>(s => s.GetUsersInRole(roleId));
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return null;
      }
    }

    public User ResetPassword(string applicationName, string userName, string password) {
      try {
        return CallService<User>(s => s.ResetPassword(applicationName, userName, password));
      }
      catch (Exception ex) {
        // Todo Errorhandling
        return null;
      }
    }

    #endregion

    #region Events
    public event EventHandler Refreshing;
    private void OnRefreshing() {
      EventHandler handler = Refreshing;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Refreshed;
    private void OnRefreshed() {
      EventHandler handler = Refreshed;
      if (handler != null) handler(this, EventArgs.Empty);
    }


    void roles_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<Role> e) {
      try {
        foreach (Role r in e.Items)
          CallService(s => s.DeleteRole(r.Id));
      }
      catch (Exception ex) {
        // ErrorHandling.ShowErrorDialog("Delete failed.", ex);
      }
    }

    void users_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<User> e) {
      try {
        foreach (User u in e.Items)
          CallService(s => s.DeleteUser(u.Id));
      }
      catch (Exception ex) {
        // ErrorHandling.ShowErrorDialog("Delete failed.", ex);
      }
    }

    void applications_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<Application> e) {
      try {
        foreach (Application a in e.Items)
          CallService(s => s.DeleteApplication(a.Id));
      }
      catch (Exception ex) {
        // ErrorHandling.ShowErrorDialog("Delete failed.", ex);
      }
    }

    #endregion
  }
}