/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.net.pop3;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.IOException;
  import java.net.InetAddress;
  
  import org.junit.jupiter.api.Test;
  
  /**
   *
   * The POP3* tests all presume the existence of the following parameters: mailserver: localhost (running on the default port 110) account: username=test;
   * password=password account: username=alwaysempty; password=password. mail: At least four emails in the test account and zero emails in the alwaysempty account
   *
   * If this won't work for you, you can change these parameters in the TestSetupParameters class.
   *
   * The tests were originally run on a default installation of James. Your mileage may vary based on the POP3 server you run the tests against. Some servers are
   * more standards-compliant than others.
   */
  class POP3ClientTest {
      POP3Client p;
  
      String user = POP3Constants.user;
      String emptyUser = POP3Constants.emptyuser;
      String password = POP3Constants.password;
      String mailhost = POP3Constants.mailhost;
  
      private void connect() throws Exception {
          p.connect(InetAddress.getByName(mailhost));
          assertTrue(p.isConnected());
          assertEquals(POP3.AUTHORIZATION_STATE, p.getState());
      }
  
      private void login() throws Exception {
          assertTrue(p.login(user, password));
          assertEquals(POP3.TRANSACTION_STATE, p.getState());
      }
  
      private void reset() throws IOException {
          // Case where this is the first time reset is called
          if (p == null) {
              // Do nothing
          } else if (p.isConnected()) {
              p.disconnect();
          }
          p = null;
          p = new POP3Client();
      }
  
      @Test
      void testInvalidLoginWithBadName() throws Exception {
          reset();
          connect();
  
          // Try with an invalid user that doesn't exist
          assertFalse(p.login("badusername", password));
      }
  
      @Test
      void testInvalidLoginWithBadPassword() throws Exception {
          reset();
          connect();
  
          // Try with a bad password
          assertFalse(p.login(user, "badpassword"));
      }
  
      /*
       * Test to try to run the login method from the disconnected, transaction and update states
       */
      @Test
      void testLoginFromWrongState() throws Exception {
          reset();
  
          // Not currently connected, not in authorization state
          // Try to login with good name/password
          assertFalse(p.login(user, password));
  
          // Now connect and set the state to 'transaction' and try again
          connect();
          p.setState(POP3.TRANSACTION_STATE);
         assertFalse(p.login(user, password));
         p.disconnect();
 
         // Now connect and set the state to 'update' and try again
         connect();
         p.setState(POP3.UPDATE_STATE);
         assertFalse(p.login(user, password));
         p.disconnect();
     }
 
     @Test
     void testLogoutFromAllStates() throws Exception {
         // From 'transaction' state
         reset();
         connect();
         login();
         assertTrue(p.logout());
         assertEquals(POP3.UPDATE_STATE, p.getState());
 
         // From 'update' state
         reset();
         connect();
         login();
         p.setState(POP3.UPDATE_STATE);
         assertTrue(p.logout());
     }
 
     /*
      * Simple test to logon to a valid server using a valid user name and password.
      */
     @Test
     void testValidLoginWithNameAndPassword() throws Exception {
         reset();
         connect();
 
         // Try with a valid user
         login();
     }
 }