/*
    * Copyright (C) 2012 The Guava Authors
    *
    * Licensed 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 com.google.common.reflect;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.testing.MapTestSuiteBuilder;
  import com.google.common.collect.testing.features.CollectionFeature;
  import com.google.common.collect.testing.features.CollectionSize;
  import com.google.common.collect.testing.features.MapFeature;
  import com.google.common.collect.testing.testers.MapPutTester;
  import com.google.common.reflect.ImmutableTypeToInstanceMapTest.TestTypeToInstanceMapGenerator;
  
  import junit.framework.Test;
  import junit.framework.TestCase;
  import junit.framework.TestSuite;
  
  import java.lang.reflect.Method;
  import java.util.Map;
  import java.util.Map.Entry;
  
  /**
   * Unit test of {@link MutableTypeToInstanceMap}.
   *
   * @author Ben Yu
   */
  public class MutableTypeToInstanceMapTest extends TestCase {
  
    public static Test suite() {
      TestSuite suite = new TestSuite();
      suite.addTestSuite(MutableTypeToInstanceMapTest.class);
  
      // Suppress this one because the tester framework doesn't understand that
      // *some* remappings will be allowed and others not.
      Method remapTest = null;
      try {
        remapTest = MapPutTester.class.getMethod(
            "testPut_replaceNullValueWithNonNullSupported");
      } catch (NoSuchMethodException e) {
        throw new AssertionError();
      }
  
      suite.addTest(MapTestSuiteBuilder
          .using(new TestTypeToInstanceMapGenerator() {
            // Other tests will verify what real, warning-free usage looks like
            // but here we have to do some serious fudging
            @Override
            @SuppressWarnings("unchecked")
            public Map<TypeToken, Object> create(Object... elements) {
              MutableTypeToInstanceMap<Object> map
                  = new MutableTypeToInstanceMap<Object>();
              for (Object object : elements) {
                Entry<TypeToken, Object> entry = (Entry<TypeToken, Object>) object;
                map.putInstance(entry.getKey(), entry.getValue());
              }
              return (Map) map;
            }
          })
          .named("MutableTypeToInstanceMap")
          .withFeatures(
              MapFeature.SUPPORTS_REMOVE,
              MapFeature.RESTRICTS_KEYS,
              MapFeature.ALLOWS_NULL_VALUES,
              CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
              CollectionSize.ANY,
              MapFeature.ALLOWS_ANY_NULL_QUERIES)
          .suppressing(remapTest)
          .createTestSuite());
  
      return suite;
    }
  
    private TypeToInstanceMap<Object> map;
  
    @Override protected void setUp() throws Exception {
      map = new MutableTypeToInstanceMap<Object>();
    }
  
    public void testPutThrows() {
      try {
        map.put(TypeToken.of(Integer.class), new Integer(5));
        fail();
      } catch (UnsupportedOperationException expected) {}
   }
 
   public void testPutAllThrows() {
     try {
       map.putAll(ImmutableMap.of(TypeToken.of(Integer.class), new Integer(5)));
       fail();
     } catch (UnsupportedOperationException expected) {}
   }
 
   public void testEntrySetMutationThrows() {
     map.putInstance(String.class, "test");
     assertEquals(TypeToken.of(String.class), map.entrySet().iterator().next().getKey());
     assertEquals("test", map.entrySet().iterator().next().getValue());
     try {
       map.entrySet().iterator().next().setValue(1);
       fail();
     } catch (UnsupportedOperationException expected) {}
   }
 
   public void testEntrySetToArrayMutationThrows() {
     map.putInstance(String.class, "test");
     @SuppressWarnings("unchecked") // Should get a CCE later if cast is wrong
     Entry<Object, Object> entry = (Entry<Object, Object>) map.entrySet().toArray()[0];
     assertEquals(TypeToken.of(String.class), entry.getKey());
     assertEquals("test", entry.getValue());
     try {
       entry.setValue(1);
       fail();
     } catch (UnsupportedOperationException expected) {}
   }
 
   public void testEntrySetToTypedArrayMutationThrows() {
     map.putInstance(String.class, "test");
     @SuppressWarnings("unchecked") // Should get a CCE later if cast is wrong
     Entry<Object, Object> entry = map.entrySet().toArray(new Entry[0])[0];
     assertEquals(TypeToken.of(String.class), entry.getKey());
     assertEquals("test", entry.getValue());
     try {
       entry.setValue(1);
       fail();
     } catch (UnsupportedOperationException expected) {}
   }
 
   public void testPutAndGetInstance() {
     assertNull(map.putInstance(Integer.class, new Integer(5)));
 
     Integer oldValue = map.putInstance(Integer.class, new Integer(7));
     assertEquals(5, (int) oldValue);
 
     Integer newValue = map.getInstance(Integer.class);
     assertEquals(7, (int) newValue);
     assertEquals(7, (int) map.getInstance(TypeToken.of(Integer.class)));
 
     // Won't compile: map.putInstance(Double.class, new Long(42));
   }
 
   public void testNull() {
     try {
       map.putInstance((TypeToken) null, new Integer(1));
       fail();
     } catch (NullPointerException expected) {
     }
     map.putInstance(Integer.class, null);
     assertNull(map.get(Integer.class));
     assertNull(map.getInstance(Integer.class));
 
     map.putInstance(Long.class, null);
     assertNull(map.get(Long.class));
     assertNull(map.getInstance(Long.class));
   }
 
   public void testPrimitiveAndWrapper() {
     assertNull(map.getInstance(int.class));
     assertNull(map.getInstance(Integer.class));
 
     assertNull(map.putInstance(int.class, 0));
     assertNull(map.putInstance(Integer.class, 1));
     assertEquals(2, map.size());
 
     assertEquals(0, (int) map.getInstance(int.class));
     assertEquals(1, (int) map.getInstance(Integer.class));
 
     assertEquals(0, (int) map.putInstance(int.class, null));
     assertEquals(1, (int) map.putInstance(Integer.class, null));
 
     assertNull(map.getInstance(int.class));
     assertNull(map.getInstance(Integer.class));
     assertEquals(2, map.size());
   }
 
   public void testParameterizedType() {
     TypeToken<ImmutableList<Integer>> type = new TypeToken<ImmutableList<Integer>>() {};
     map.putInstance(type, ImmutableList.of(1));
     assertEquals(1, map.size());
     assertEquals(ImmutableList.of(1), map.getInstance(type));
   }
 
   public void testGenericArrayType() {
     @SuppressWarnings("unchecked") // Trying to test generic array
     ImmutableList<Integer>[] array = new ImmutableList[] {ImmutableList.of(1)};
     TypeToken<ImmutableList<Integer>[]> type = new TypeToken<ImmutableList<Integer>[]>() {};
     map.putInstance(type, array);
     assertEquals(1, map.size());
     assertThat(map.getInstance(type)).asList().has().exactly(array[0]).inOrder();
   }
 
   public void testWildcardType() {
     TypeToken<ImmutableList<?>> type = new TypeToken<ImmutableList<?>>() {};
     map.putInstance(type, ImmutableList.of(1));
     assertEquals(1, map.size());
     assertEquals(ImmutableList.of(1), map.getInstance(type));
   }
 
   public void testGetInstance_withTypeVariable() {
     try {
       map.getInstance(this.<Number>anyIterableType());
       fail();
     } catch (IllegalArgumentException expected) {}
   }
 
   public void testPutInstance_withTypeVariable() {
     try {
       map.putInstance(this.<Integer>anyIterableType(), ImmutableList.of(1));
       fail();
     } catch (IllegalArgumentException expected) {}
   }
 
   private <T> TypeToken<Iterable<T>> anyIterableType() {
     return new TypeToken<Iterable<T>>() {};
   }
 }