/*
 * Copyright 2023 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.FixChoosers;
import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link StringCaseLocaleUsage}. */
@RunWith(JUnit4.class)
public final class StringCaseLocaleUsageTest {
  private final CompilationTestHelper compilationTestHelper =
      CompilationTestHelper.newInstance(StringCaseLocaleUsage.class, getClass());
  private final BugCheckerRefactoringTestHelper refactoringTestHelper =
      BugCheckerRefactoringTestHelper.newInstance(StringCaseLocaleUsage.class, getClass());

  @Test
  public void identification() {
    compilationTestHelper
        .addSourceLines(
            "A.java",
            """
            import static java.util.Locale.ROOT;

            import java.util.Locale;

            class A {
              void m() {
                "a".toLowerCase(Locale.ROOT);
                "a".toUpperCase(Locale.ROOT);
                "b".toLowerCase(ROOT);
                "b".toUpperCase(ROOT);
                "c".toLowerCase(Locale.getDefault());
                "c".toUpperCase(Locale.getDefault());
                "d".toLowerCase(Locale.ENGLISH);
                "d".toUpperCase(Locale.ENGLISH);
                "e".toLowerCase(new Locale("foo"));
                "e".toUpperCase(new Locale("foo"));

                // BUG: Diagnostic contains:
                "f".toLowerCase();
                // BUG: Diagnostic contains:
                "g".toUpperCase();

                String h = "h";
                // BUG: Diagnostic contains:
                h.toLowerCase();
                String i = "i";
                // BUG: Diagnostic contains:
                i.toUpperCase();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void replacementFirstSuggestedFix() {
    refactoringTestHelper
        .addInputLines(
            "A.java",
            """
            class A {
              void m() {
                "a".toLowerCase(/* Comment with parens: (). */ );
                "b".toUpperCase();
                "c".toLowerCase().toString();

                toString().toLowerCase();
                toString().toUpperCase /* Comment with parens: (). */();

                this.toString().toLowerCase() /* Comment with parens: (). */;
                this.toString().toUpperCase();
              }
            }
            """)
        .addOutputLines(
            "A.java",
            """
            import java.util.Locale;

            class A {
              void m() {
                "a".toLowerCase(/* Comment with parens: (). */ Locale.ROOT);
                "b".toUpperCase(Locale.ROOT);
                "c".toLowerCase(Locale.ROOT).toString();

                toString().toLowerCase(Locale.ROOT);
                toString().toUpperCase /* Comment with parens: (). */(Locale.ROOT);

                this.toString().toLowerCase(Locale.ROOT) /* Comment with parens: (). */;
                this.toString().toUpperCase(Locale.ROOT);
              }
            }
            """)
        .doTest(TestMode.TEXT_MATCH);
  }

  @Test
  public void replacementSecondSuggestedFix() {
    refactoringTestHelper
        .setFixChooser(FixChoosers.SECOND)
        .addInputLines(
            "A.java",
            """
            class A {
              void m() {
                "a".toLowerCase();
                "b".toUpperCase(/* Comment with parens: (). */ );
                "c".toLowerCase().toString();

                toString().toLowerCase();
                toString().toUpperCase /* Comment with parens: (). */();

                this.toString().toLowerCase() /* Comment with parens: (). */;
                this.toString().toUpperCase();
              }
            }
            """)
        .addOutputLines(
            "A.java",
            """
            import java.util.Locale;

            class A {
              void m() {
                "a".toLowerCase(Locale.getDefault());
                "b".toUpperCase(/* Comment with parens: (). */ Locale.getDefault());
                "c".toLowerCase(Locale.getDefault()).toString();

                toString().toLowerCase(Locale.getDefault());
                toString().toUpperCase /* Comment with parens: (). */(Locale.getDefault());

                this.toString().toLowerCase(Locale.getDefault()) /* Comment with parens: (). */;
                this.toString().toUpperCase(Locale.getDefault());
              }
            }
            """)
        .doTest(TestMode.TEXT_MATCH);
  }

  @Test
  public void replacementThirdSuggestedFix() {
    refactoringTestHelper
        .setFixChooser(FixChoosers.THIRD)
        .addInputLines(
            "A.java",
            """
            class A {
              void m() {
                "a".toLowerCase();
                "c".toLowerCase().toString();
              }
            }
            """)
        .addOutputLines(
            "A.java",
            """
            import com.google.common.base.Ascii;

            class A {
              void m() {
                Ascii.toLowerCase("a");
                Ascii.toLowerCase("c").toString();
              }
            }
            """)
        .doTest();
  }
}
