/*
    * 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
    *
    *     http://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.configuration2.io;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  import static org.mockito.Mockito.when;
  
  import org.apache.commons.configuration2.AbstractConfiguration;
  import org.apache.commons.configuration2.BaseConfiguration;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.impl.Log4JLogger;
  import org.apache.commons.logging.impl.NoOpLog;
  import org.junit.jupiter.api.Test;
  
  /**
   * Test class for {@code ConfigurationLogger}.
   */
  public class TestConfigurationLogger {
      /** Constant for a message to be logged. */
      private static final String MSG = "Interesting log output";
  
      /**
       * Tests the logger set per default.
       */
      @Test
      public void testAbstractConfigurationDefaultLogger() {
          final AbstractConfiguration config = new BaseConfiguration();
          assertInstanceOf(NoOpLog.class, config.getLogger().getLog());
      }
  
      /**
       * Tests whether the logger can be set.
       */
      @Test
      public void testAbstractConfigurationSetLogger() {
          final ConfigurationLogger logger = new ConfigurationLogger(getClass());
          final AbstractConfiguration config = new BaseConfiguration();
  
          config.setLogger(logger);
          assertSame(logger, config.getLogger());
      }
  
      /**
       * Tests that the logger can be disabled by setting it to null.
       */
      @Test
      public void testAbstractConfigurationSetLoggerNull() {
          final AbstractConfiguration config = new BaseConfiguration();
          config.setLogger(new ConfigurationLogger(getClass()));
  
          config.setLogger(null);
          assertInstanceOf(NoOpLog.class, config.getLogger().getLog());
      }
  
      /**
       * Tests whether debug logging is possible.
       */
      @Test
      public void testDebug() {
          final Log log = mock(Log.class);
          final ConfigurationLogger logger = new ConfigurationLogger(log);
  
          logger.debug(MSG);
  
          verify(log).debug(MSG);
          verifyNoMoreInteractions(log);
      }
  
      /**
       * Tests whether a dummy logger can be created.
       */
      @Test
      public void testDummyLogger() {
          final ConfigurationLogger logger = ConfigurationLogger.newDummyLogger();
 
         assertInstanceOf(NoOpLog.class, logger.getLog());
     }
 
     /**
      * Tests whether error logging is possible.
      */
     @Test
     public void testError() {
         final Log log = mock(Log.class);
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         logger.error(MSG);
 
         verify(log).error(MSG);
         verifyNoMoreInteractions(log);
     }
 
     /**
      * Tests whether an exception can be logged on error level.
      */
     @Test
     public void testErrorWithException() {
         final Log log = mock(Log.class);
         final Throwable ex = new Exception("Test exception");
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         logger.error(MSG, ex);
 
         verify(log).error(MSG, ex);
         verifyNoMoreInteractions(log);
     }
 
     /**
      * Tests whether info logging is possible.
      */
     @Test
     public void testInfo() {
         final Log log = mock(Log.class);
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         logger.info(MSG);
 
         verify(log).info(MSG);
         verifyNoMoreInteractions(log);
     }
 
     /**
      * Tries to create an instance without passing a logger class.
      */
     @Test
     public void testInitNoLoggerClass() {
         assertThrows(IllegalArgumentException.class, () -> new ConfigurationLogger((Class<?>) null));
     }
 
     /**
      * Tries to create an instance without passing in a logger name.
      */
     @Test
     public void testInitNoLoggerName() {
         assertThrows(IllegalArgumentException.class, () -> new ConfigurationLogger((String) null));
     }
 
     /**
      * Tests whether a correct internal logger is created.
      */
     @Test
     public void testInitWithLoggerSpec() {
         final ConfigurationLogger logger1 = new ConfigurationLogger(getClass().getName());
         final ConfigurationLogger logger2 = new ConfigurationLogger(getClass());
 
         assertNotNull(logger1.getLog());
         if (logger1.getLog() instanceof Log4JLogger) {
             assertEquals(logger1.getLog(), logger2.getLog());
         }
         // else: TODO assert what for the Slf4j adapter?
     }
 
     /**
      * Tests whether the debug status can be queried.
      */
     @Test
     public void testIsDebugEnabled() {
         final Log log = mock(Log.class);
 
         when(log.isDebugEnabled()).thenReturn(Boolean.TRUE);
 
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         assertTrue(logger.isDebugEnabled());
 
         verify(log).isDebugEnabled();
         verifyNoMoreInteractions(log);
     }
 
     /**
      * Tests whether the info status can be queried.
      */
     @Test
     public void testIsInfoEnabled() {
         final Log log = mock(Log.class);
 
         when(log.isInfoEnabled()).thenReturn(Boolean.FALSE);
 
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         assertFalse(logger.isInfoEnabled());
 
         verify(log).isInfoEnabled();
         verifyNoMoreInteractions(log);
     }
 
     /**
      * Tests that a derived class can be created for a logger.
      */
     @Test
     public void testSubClass() {
         final StringBuilder buf = new StringBuilder();
         final ConfigurationLogger logger = new ConfigurationLogger() {
             @Override
             public void info(final String msg) {
                 buf.append(msg);
             }
         };
 
         assertNull(logger.getLog());
         logger.info(MSG);
         assertEquals(MSG, buf.toString());
     }
 
     /**
      * Tests whether warn logging is possible.
      */
     @Test
     public void testWarn() {
         final Log log = mock(Log.class);
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         logger.warn(MSG);
 
         verify(log).warn(MSG);
         verifyNoMoreInteractions(log);
     }
 
     /**
      * Tests whether an exception can be logged on warn level.
      */
     @Test
     public void testWarnWithException() {
         final Log log = mock(Log.class);
         final Throwable ex = new Exception("Test exception");
         final ConfigurationLogger logger = new ConfigurationLogger(log);
 
         logger.warn(MSG, ex);
 
         verify(log).warn(MSG, ex);
         verifyNoMoreInteractions(log);
     }
 }