/*
 * 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;

/** Tests for {@link UnsafeLocaleUsage}. */
@RunWith(JUnit4.class)
public class UnsafeLocaleUsageTest {

  private final CompilationTestHelper compilationHelper =
      CompilationTestHelper.newInstance(UnsafeLocaleUsage.class, getClass());
  private final BugCheckerRefactoringTestHelper refactoringHelper =
      BugCheckerRefactoringTestHelper.newInstance(UnsafeLocaleUsage.class, getClass());

  @Test
  public void unsafeLocaleUsageCheck_constructorUsageWithOneParam_shouldRefactorNonLiteralParam() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a) {
                   locale = new Locale(a);
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh_hant_tw");

            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a) {
                   locale = Locale.forLanguageTag(a.replace('_', '-'));
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh_hant_tw");

            }
            """)
        .doTest();
  }

  @Test
  public void unsafeLocaleUsageCheck_constructorUsageWithOneParam_shouldRefactorLiteralParam() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              private static final Locale LOCALE = new Locale("zh_hant_tw");
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              private static final Locale LOCALE = Locale.forLanguageTag("zh-hant-tw");
            }
            """)
        .doTest();
  }

  @Test
  public void unsafeLocaleUsageCheck_constructorUsageWithTwoParams_shouldRefactor() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a, String b) {
                   locale = new Locale(a, b);
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh", "tw");

            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a, String b) {
                   locale = new Locale.Builder().setLanguage(a).setRegion(b).build();
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh", "tw");

            }
            """)
        .doTest();
  }

  @Test
  public void unsafeLocaleUsageCheck_constructorUsageWithThreeParams_shouldFlag() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a, String b, String c) {
                   // BUG: Diagnostic contains: forLanguageTag(String)
                   locale = new Locale(a, b, c);
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh", "tw", "hant");

            }
            """)
        .doTest();
  }

  @Test
  public void unsafeLocaleUsageCheck_toStringUsage_shouldRefactor() {
    refactoringHelper
        .addInputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a) {
                   locale = Locale.forLanguageTag(a);
                }

                String getLocaleDisplayString() {
                   return locale.toString();
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh_hant_tw");
            }
            """)
        .addOutputLines(
            "Test.java",
            """
            import java.util.Locale;

            class Test {
              static class Inner {
                private Locale locale;
                Inner(String a) {
                   locale = Locale.forLanguageTag(a);
                }

                String getLocaleDisplayString() {
                   return locale.toLanguageTag();
                }
              }

              private static final Test.Inner INNER_OBJ = new Inner("zh_hant_tw");
            }
            """)
        .doTest();
  }

  @Test
  public void unsafeLocaleUsageCheck_multipleErrors_shouldFlag() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.Locale;
            class Test {
                // BUG: Diagnostic contains: forLanguageTag(String)
                private static final Locale LOCALE = new Locale(
                    // BUG: Diagnostic contains: toLanguageTag()
                    Locale.TAIWAN.toString());
            }
            """)
        .doTest();
  }

  @Test
  public void unsafeLocaleUsageCheck_instanceMethodUsage_shouldNotFlag() {
    compilationHelper
        .addSourceLines(
            "Test.java",
            """
            import java.util.Locale;
            import com.google.common.collect.ImmutableMap;
            class Test {
              private static final ImmutableMap<String, Locale> INTERNAL_COUNTRY_CODE_TO_LOCALE =
                ImmutableMap.of("abc", Locale.KOREAN);
              private static final String DISPLAY_NAME = getLocaleDisplayNameFromCode("abc");

              public static final String getLocaleDisplayNameFromCode(String code) {
                return INTERNAL_COUNTRY_CODE_TO_LOCALE.get(code).getDisplayName();
              }
            }
            """)
        .doTest();
  }
}
