/*
 * Copyright 2017 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.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** {@link DateFormatConstant}Test */
@RunWith(JUnit4.class)
public class DateFormatConstantTest {
  @Test
  public void positive() {
    CompilationTestHelper.newInstance(DateFormatConstant.class, getClass())
        .addSourceLines(
            "Test.java",
"""
import java.text.DateFormat;
import java.text.SimpleDateFormat;

class Test {
  // BUG: Diagnostic contains:
  private static final DateFormat DATE_FORMAT1 = new SimpleDateFormat("yyyy-MM-dd HH:mm");
  // BUG: Diagnostic contains:
  private static final SimpleDateFormat DATE_FORMAT2 = new SimpleDateFormat("yyyy-MM-dd HH:mm");
}
""")
        .doTest();
  }

  @Test
  public void negative() {
    CompilationTestHelper.newInstance(DateFormatConstant.class, getClass())
        .addSourceLines(
            "Test.java",
"""
import java.text.SimpleDateFormat;

class Test {
  private static final SimpleDateFormat NO_INITIALIZER;

  static {
    NO_INITIALIZER = new SimpleDateFormat("yyyy-MM-dd HH:mm");
  }

  private final SimpleDateFormat NON_STATIC = new SimpleDateFormat("yyyy-MM-dd HH:mm");
  private static SimpleDateFormat NON_FINAL = new SimpleDateFormat("yyyy-MM-dd HH:mm");
  private static final SimpleDateFormat lowerCamelCase = new SimpleDateFormat("yyyy-MM-dd HH:mm");

  static void f() {
    final SimpleDateFormat NOT_A_FIELD = new SimpleDateFormat("yyyy-MM-dd HH:mm");
  }

  private static final String NOT_A_SIMPLE_DATE_FORMAT = "";
}
""")
        .doTest();
  }

  @Test
  public void threadLocalFix() {
    BugCheckerRefactoringTestHelper.newInstance(DateFormatConstant.class, getClass())
        .addInputLines(
            "in/Test.java",
"""
import java.text.SimpleDateFormat;
import java.text.DateFormat;
import java.util.Date;

class Test {
  private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm");

  static String f(Date d) {
    return DATE_FORMAT.format(d);
  }
}
""")
        .addOutputLines(
            "out/Test.java",
            """
            import java.text.SimpleDateFormat;
            import java.text.DateFormat;
            import java.util.Date;

            class Test {
              private static final ThreadLocal<DateFormat> dateFormat =
                  ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyy-MM-dd HH:mm"));

              static String f(Date d) {
                return dateFormat.get().format(d);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void lowerCamelCaseFix() {
    BugCheckerRefactoringTestHelper.newInstance(DateFormatConstant.class, getClass())
        .addInputLines(
            "in/Test.java",
"""
import java.text.SimpleDateFormat;
import java.text.DateFormat;
import java.util.Date;

class Test {
  private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm");

  static String f(Date d) {
    return DATE_FORMAT.format(d);
  }
}
""")
        .addOutputLines(
            "out/Test.java",
"""
import java.text.SimpleDateFormat;
import java.text.DateFormat;
import java.util.Date;

class Test {
  private static final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");

  static String f(Date d) {
    return dateFormat.format(d);
  }
}
""")
        .setFixChooser(FixChoosers.SECOND)
        .doTest();
  }
}
