/*
 * 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.BugCheckerRefactoringTestHelper.TestMode;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** {@link UseEnumSwitch}Test */
@RunWith(JUnit4.class)
public class UseEnumSwitchTest {
  private final BugCheckerRefactoringTestHelper refactoringHelper =
      BugCheckerRefactoringTestHelper.newInstance(UseEnumSwitch.class, getClass());

  @Test
  public void refactoring() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            class Test {
              enum E {
                ONE,
                TWO,
                THREE
              }

              int f(E e) {
                if (e.equals(E.ONE)) {
                  return 1;
                } else if (e.equals(E.TWO)) {
                  return 2;
                } else {
                  return 3;
                }
              }
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            class Test {
              enum E {
                ONE,
                TWO,
                THREE
              }

              int f(E e) {
                switch (e) {
                  case ONE:
                    return 1;
                  case TWO:
                    return 2;
                  default:
                    return 3;
                }
              }
            }
            """)
        .doTest(TestMode.TEXT_MATCH);
  }

  @Test
  public void nonConstantEnum() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            class Test {
              enum E {
                ONE,
                TWO,
                THREE;

                E one() {
                  return ONE;
                }
              }

              int f(E e) {
                if (e == e.one()) {
                  return 1;
                } else if (e == E.TWO) {
                  return 2;
                } else {
                  return 3;
                }
              }
            }
            """)
        .expectUnchanged()
        .doTest(TestMode.TEXT_MATCH);
  }

  @Test
  public void notActuallyEnum_noFinding() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            class Test {
              interface A {}

              enum E implements A {
                ONE,
                TWO,
                THREE
              }

              int f(A e) {
                if (e.equals(E.ONE)) {
                  return 1;
                } else if (e.equals(E.TWO)) {
                  return 2;
                } else {
                  return 3;
                }
              }
            }
            """)
        .expectUnchanged()
        .doTest(TestMode.TEXT_MATCH);
  }
}
