package jetbrains.buildServer.serverSide;

import jetbrains.buildServer.users.SUser;
import jetbrains.buildServer.users.User;
import jetbrains.buildServer.users.UserModel;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author Eugene Petrenko
 *         Created: 31.03.2010 18:17:14
 */
public class UserContextFactory {
  private final UserModel myUserManager;
  public static final String ME = "me";

  public UserContextFactory(UserModel userManager) {
    myUserManager = userManager;
  }

  public UserContext getUserNamesForUserSession(@Nullable final User sessionUser) {
    return new UserContext() {
      public boolean isMe(User user) {
        return user != null && sessionUser != null && user.getId() == sessionUser.getId();
      }

      @NotNull
      public String getUserName(@Nullable User user) {
        if (usersAreEqual(sessionUser, user)) return ME;
        
        return UserContextFactory.this.getUserName(user);
      }
    };
  }

  private boolean usersAreEqual(@Nullable User a, @Nullable User b) {
    return (a != null && b != null && a.getId() == b.getId());
  }

  private String getUserName(@Nullable User user) {
    if (user == null) 
      return "My Boss";

    return user.getUsername();
  }

  @Nullable
  public User findToUser(String userNameFormMessage) {
    final SUser user = myUserManager.findUserAccount(null, userNameFormMessage);
    if (user != null) return user;

    return null;
  }
}