/*
 * Copyright 2024 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.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class UnnecessaryBreakInSwitchTest {

  private final CompilationTestHelper testHelper =
      CompilationTestHelper.newInstance(UnnecessaryBreakInSwitch.class, getClass());

  @Test
  public void positive() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                switch (i) {
                  default -> {
                    // BUG: Diagnostic contains: break is unnecessary
                    break;
                  }
                }
                ;
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negativeTraditional() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                switch (i) {
                  default:
                    break;
                }
                ;
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negativeEmpty() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                switch (i) {
                  default -> {}
                }
                ;
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negativeNotLast() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                switch (i) {
                  default -> {
                    if (true) {
                      break;
                    }
                    System.err.println();
                  }
                }
                ;
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negativeLabelledBreak() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                outer:
                while (true) {
                  switch (i) {
                    default -> {
                      break outer;
                    }
                  }
                }
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negativeLoop() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                while (true) {
                  switch (i) {
                    default -> {
                      while (true) {
                        break;
                      }
                    }
                  }
                }
              }
            }
            """)
        .doTest();
  }

  @Test
  public void positiveIf() {
    testHelper
        .addSourceLines(
            "Test.java",
            """
            class Test {
              void f(int i) {
                switch (i) {
                  default -> {
                    if (true) {
                      // BUG: Diagnostic contains: break is unnecessary
                      break;
                    } else {
                      // BUG: Diagnostic contains: break is unnecessary
                      break;
                    }
                  }
                }
                ;
              }
            }
            """)
        .doTest();
  }
}
