/*
 * Copyright 2022 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.common.base.Predicates;
import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link MissingRefasterAnnotation}. */
@RunWith(JUnit4.class)
public final class MissingRefasterAnnotationTest {
  private final CompilationTestHelper compilationTestHelper =
      CompilationTestHelper.newInstance(MissingRefasterAnnotation.class, getClass())
          .expectErrorMessage(
              "X",
              Predicates.containsPattern(
                  "The Refaster template contains a method without any Refaster annotations"));

  @Test
  public void testIdentification() {
    compilationTestHelper
        .addSourceLines(
            "A.java",
            """
            import com.google.errorprone.refaster.annotation.AfterTemplate;
            import com.google.errorprone.refaster.annotation.AlsoNegation;
            import com.google.errorprone.refaster.annotation.BeforeTemplate;
            import java.util.Map;

            class A {
              // BUG: Diagnostic matches: X
              static final class MethodLacksBeforeTemplateAnnotation {
                @BeforeTemplate
                boolean before1(String string) {
                  return string.equals("");
                }

                // @BeforeTemplate is missing
                boolean before2(String string) {
                  return string.length() == 0;
                }

                @AfterTemplate
                @AlsoNegation
                boolean after(String string) {
                  return string.isEmpty();
                }
              }

              // BUG: Diagnostic matches: X
              static final class MethodLacksAfterTemplateAnnotation {
                @BeforeTemplate
                boolean before(String string) {
                  return string.equals("");
                }

                // @AfterTemplate is missing
                boolean after(String string) {
                  return string.isEmpty();
                }
              }

              // BUG: Diagnostic matches: X
              abstract class MethodLacksPlaceholderAnnotation<K, V> {
                // @Placeholder is missing
                abstract V function(K key);

                @BeforeTemplate
                void before(Map<K, V> map, K key) {
                  if (!map.containsKey(key)) {
                    map.put(key, function(key));
                  }
                }

                @AfterTemplate
                void after(Map<K, V> map, K key) {
                  map.computeIfAbsent(key, k -> function(k));
                }
              }

              static final class ValidRefasterTemplate {
                @BeforeTemplate
                void unusedPureFunctionCall(Object o) {
                  o.toString();
                }
              }

              static final class NotARefasterTemplate {
                @Override
                public String toString() {
                  return "This is not a Refaster template";
                }
              }
            }
            """)
        .doTest();
  }
}
