/**
    * Copyright (c) 2004-2011 QOS.ch
    * All rights reserved.
    *
    * Permission is hereby granted, free  of charge, to any person obtaining
    * a  copy  of this  software  and  associated  documentation files  (the
    * "Software"), to  deal in  the Software without  restriction, including
    * without limitation  the rights to  use, copy, modify,  merge, publish,
    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
   * permit persons to whom the Software  is furnished to do so, subject to
   * the following conditions:
   *
   * The  above  copyright  notice  and  this permission  notice  shall  be
   * included in all copies or substantial portions of the Software.
   *
   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   */
  package org.slf4j.helpers;
  
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.event.EventRecordingLogger;
  
  /**
   * @author Chetan Mehrotra
   * @author Ceki Gülcü
   */
  public class SubstitutableLoggerTest {
  
      // NOTE: previous implementations of this class performed a hand crafted conversion of 
      // a method to a string. In this implementation we just invoke method.toString().
      
      // WARNING: if you need to add an excluded method to have tests pass, ask yourself whether you
      // forgot to implement the said method with delegation in SubstituteLogger. You probably did.
      private static final Set<String> EXCLUDED_METHODS = new HashSet<>(
              Arrays.asList("getName"));
  
      
      /**
       * Test that all SubstituteLogger methods invoke the delegate, except for explicitly excluded  methods.
       */
      @Test
      public void delegateIsInvokedTest() throws Exception {
          SubstituteLogger substituteLogger = new SubstituteLogger("foo", null, false);
          assertTrue(substituteLogger.delegate() instanceof EventRecordingLogger);
  
          Set<String> expectedMethodSignatures = determineMethodSignatures(Logger.class);
          LoggerInvocationHandler loggerInvocationHandler = new LoggerInvocationHandler();
          Logger proxyLogger = (Logger) Proxy.newProxyInstance(getClass().getClassLoader(), new Class[] { Logger.class }, loggerInvocationHandler);
          substituteLogger.setDelegate(proxyLogger);
  
          invokeAllMethodsOf(substituteLogger);
  
          // Assert that all methods are delegated
          expectedMethodSignatures.removeAll(loggerInvocationHandler.getInvokedMethodSignatures());
          if (!expectedMethodSignatures.isEmpty()) {
              fail("Following methods are not delegated " + expectedMethodSignatures.toString());
          }
      }
  
      private void invokeAllMethodsOf(Logger logger) throws InvocationTargetException, IllegalAccessException {
          for (Method m : Logger.class.getDeclaredMethods()) {
              if (!EXCLUDED_METHODS.contains(m.getName())) {
                  m.invoke(logger, new Object[m.getParameterTypes().length]);
              }
          }
      }
  
      private static Set<String> determineMethodSignatures(Class<Logger> loggerClass) {
          Set<String> methodSignatures = new HashSet<>();
          // Note: Class.getDeclaredMethods() does not include inherited methods
          for (Method m : loggerClass.getDeclaredMethods()) {
              if (!EXCLUDED_METHODS.contains(m.getName())) {
                  methodSignatures.add(m.toString());
              }
          }
          return methodSignatures;
      }
  
      
      // implements InvocationHandler 
     private class LoggerInvocationHandler implements InvocationHandler {
         private final Set<String> invokedMethodSignatures = new HashSet<>();
 
         public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
             invokedMethodSignatures.add(method.toString());
             if (method.getName().startsWith("is")) {
                 return true;
             }
             return null;
         }
 
         public Set<String> getInvokedMethodSignatures() {
             return invokedMethodSignatures;
         }
     }
 }