/*
    * MIT License
    * Copyright (c) 2006-2025 JMockit developers
    * See LICENSE file for full license text.
    */
   package jmockit.loginExample.domain.userLogin;
   
   import edu.umd.cs.findbugs.annotations.NonNull;
   import edu.umd.cs.findbugs.annotations.Nullable;
  
  import org.checkerframework.checker.index.qual.NonNegative;
  
  import jmockit.loginExample.domain.userAccount.UserAccount;
  
  public final class LoginService {
      private static final int MAX_LOGIN_ATTEMPTS = 3;
  
      @NonNegative
      private int loginAttemptsRemaining = MAX_LOGIN_ATTEMPTS;
      @Nullable
      private String previousAccountId;
      @Nullable
      private UserAccount account;
  
      public void login(@NonNull String accountId, @NonNull String password)
              throws UserAccountNotFoundException, UserAccountRevokedException, AccountLoginLimitReachedException {
          account = UserAccount.find(accountId);
  
          if (account == null) {
              throw new UserAccountNotFoundException();
          }
  
          if (account.passwordMatches(password)) {
              registerNewLogin();
          } else {
              handleFailedLoginAttempt(accountId);
          }
      }
  
      private void registerNewLogin() throws AccountLoginLimitReachedException, UserAccountRevokedException {
          // noinspection ConstantConditions
          if (account.isLoggedIn()) {
              throw new AccountLoginLimitReachedException();
          }
  
          if (account.isRevoked()) {
              throw new UserAccountRevokedException();
          }
  
          account.setLoggedIn(true);
          loginAttemptsRemaining = MAX_LOGIN_ATTEMPTS;
      }
  
      private void handleFailedLoginAttempt(@NonNull String accountId) {
          if (previousAccountId == null) {
              loginAttemptsRemaining--;
              previousAccountId = accountId;
          } else if (accountId.equals(previousAccountId)) {
              loginAttemptsRemaining--;
  
              if (loginAttemptsRemaining == 0) {
                  // noinspection ConstantConditions
                  account.setRevoked(true);
                  loginAttemptsRemaining = MAX_LOGIN_ATTEMPTS;
              }
          } else {
              loginAttemptsRemaining = MAX_LOGIN_ATTEMPTS;
              previousAccountId = accountId;
          }
      }
  }