/*
 * Copyright 2019 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 org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * @author amalloy@google.com (Alan Malloy)
 */
@RunWith(JUnit4.class)
public class UnnecessaryMethodInvocationMatcherTest {
  private final BugCheckerRefactoringTestHelper refactoringTestHelper =
      BugCheckerRefactoringTestHelper.newInstance(
          UnnecessaryMethodInvocationMatcher.class, getClass());

  @Test
  public void replace() {
    refactoringTestHelper
        .addInputLines(
            "Test.java",
            """
            import static com.google.errorprone.matchers.Matchers.*;
            import com.google.errorprone.matchers.Matcher;
            import com.sun.source.tree.ExpressionTree;

            public class Test {
              private static final Matcher<ExpressionTree> TO_STRING =
                  methodInvocation(instanceMethod().anyClass().named("toString"));
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import static com.google.errorprone.matchers.Matchers.*;
            import com.google.errorprone.matchers.Matcher;
            import com.sun.source.tree.ExpressionTree;

            public class Test {
              private static final Matcher<ExpressionTree> TO_STRING =
                  instanceMethod().anyClass().named("toString");
            }
            """)
        .doTest();
  }

  @Test
  public void descendIntoCombinators() {
    refactoringTestHelper
        .addInputLines(
            "Test.java",
"""
import static com.google.errorprone.matchers.Matchers.*;
import com.google.errorprone.matchers.Matcher;
import com.sun.source.tree.ExpressionTree;

public class Test {
  private static final Matcher<ExpressionTree> STRINGIFY =
      methodInvocation(anyOf(instanceMethod().anyClass().named("toString"), allOf(staticMethod())));
}
""")
        .addOutputLines(
            "Test.java",
            """
            import static com.google.errorprone.matchers.Matchers.*;
            import com.google.errorprone.matchers.Matcher;
            import com.sun.source.tree.ExpressionTree;

            public class Test {
              private static final Matcher<ExpressionTree> STRINGIFY =
                  anyOf(instanceMethod().anyClass().named("toString"), allOf(staticMethod()));
            }
            """)
        .doTest();
  }

  @Test
  public void onlyChangeMethodMatchers() {
    refactoringTestHelper
        .addInputLines(
            "Test.java",
            """
            import static com.google.errorprone.matchers.Matchers.*;
            import com.google.errorprone.matchers.Matcher;
            import com.sun.source.tree.ExpressionTree;

            public class Test {
              private static final Matcher<ExpressionTree> STRINGIFY =
                  methodInvocation(
                      anyOf(
                          instanceMethod().anyClass().named("toString"),
                          allOf(hasAnnotation("java.lang.SuppressWarnings"))));
            }
            """)
        .expectUnchanged()
        .doTest();
  }

  @Test
  public void permitWithArguments() {
    refactoringTestHelper
        .addInputLines(
            "Test.java",
"""
import static com.google.errorprone.matchers.ChildMultiMatcher.MatchType.ALL;
import static com.google.errorprone.matchers.Matchers.*;
import com.google.errorprone.matchers.Matcher;
import com.sun.source.tree.ExpressionTree;

public class Test {
  private static final Matcher<ExpressionTree> TO_STRING =
      methodInvocation(instanceMethod().anyClass().named("toString"), ALL, isVariable());
}
""")
        .expectUnchanged()
        .doTest();
  }

  @Test
  public void expressionStatement() {
    refactoringTestHelper
        .addInputLines(
            "Test.java",
"""
import static com.google.errorprone.matchers.Matchers.*;
import com.google.errorprone.matchers.Matcher;
import com.sun.source.tree.StatementTree;

public class Test {
  private static final Matcher<StatementTree> TARGETED =
      expressionStatement(
          methodInvocation(
              instanceMethod().onDescendantOfAny("java.lang.Class", "java.lang.String")));
}
""")
        .addOutputLines(
            "Test.java",
            """
            import static com.google.errorprone.matchers.Matchers.*;
            import com.google.errorprone.matchers.Matcher;
            import com.sun.source.tree.StatementTree;

            public class Test {
              private static final Matcher<StatementTree> TARGETED =
                  expressionStatement(
                      instanceMethod().onDescendantOfAny("java.lang.Class", "java.lang.String"));
            }
            """)
        .doTest();
  }
}
