/*
 * Copyright 2020 The Error Prone 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.errorprone.bugpatterns;

import com.google.errorprone.BugCheckerRefactoringTestHelper;
import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@link IdentityHashMapUsage} bug pattern. */
@RunWith(JUnit4.class)
public class IdentityHashMapUsageTest {
  private final CompilationTestHelper compilationHelper =
      CompilationTestHelper.newInstance(IdentityHashMapUsage.class, getClass());
  private final BugCheckerRefactoringTestHelper refactoringHelper =
      BugCheckerRefactoringTestHelper.newInstance(IdentityHashMapUsage.class, getClass());

  @Test
  public void equals_putAll_positive() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              boolean test(Map map, IdentityHashMap ihm) {
                // BUG: Diagnostic contains: IdentityHashMapUsage
                return ihm.equals(map);
              }

              void putAll(Map map, IdentityHashMap ihm) {
                // BUG: Diagnostic contains: IdentityHashMapUsage
                ihm.putAll(map);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void equals_putAll_negative() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              boolean test(Map map, IdentityHashMap ihm) {
                return map.equals(ihm);
              }

              boolean equalsSameType(IdentityHashMap ihm, IdentityHashMap ihm2) {
                return ihm.equals(ihm2);
              }

              void putAll(Map map, IdentityHashMap ihm) {
                map.putAll(ihm);
              }

              void putAllSameType(IdentityHashMap ihm, IdentityHashMap ihm2) {
                ihm.putAll(ihm2);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void assignmentToMap() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              Map putAll(IdentityHashMap ihm) {
                Map map;
                // BUG: Diagnostic contains: IdentityHashMapUsage
                map = ihm;
                return map;
              }
            }
            """)
        .doTest();
  }

  @Test
  public void variableInitializationToSuperType() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              Map putAll(IdentityHashMap ihmArg) {
                Map map = ihmArg;
                return map;
              }
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              Map putAll(IdentityHashMap ihmArg) {
                IdentityHashMap map = ihmArg;
                return map;
              }
            }
            """)
        .doTest();
  }

  @Test
  public void ihmInitializationWithNonIhm() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              IdentityHashMap something(Map mapArg) {
                // BUG: Diagnostic contains: IdentityHashMapUsage
                return new IdentityHashMap(mapArg);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void fieldType() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              private final Map<String, Integer> m = new IdentityHashMap<>();
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import java.util.IdentityHashMap;
            import java.util.Map;

            class Test {
              private final IdentityHashMap<String, Integer> m = new IdentityHashMap<>();
            }
            """)
        .doTest();
  }
}
