/*
 * 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.auto.value.processor.AutoValueProcessor;
import com.google.common.collect.ImmutableList;
import com.google.errorprone.CompilationTestHelper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link AutoValueSubclassLeaked}. */
@RunWith(JUnit4.class)
public final class AutoValueSubclassLeakedTest {
  private final CompilationTestHelper helper =
      CompilationTestHelper.newInstance(AutoValueSubclassLeaked.class, getClass())
          .setArgs(ImmutableList.of("-processor", AutoValueProcessor.class.getName()));

  @Test
  public void positive() {
    helper
        .addSourceLines(
            "Test.java",
            """
            package test;

            import com.google.auto.value.AutoValue;

            class Test {
              @AutoValue
              abstract static class Foo {
                abstract int foo();
              }
            }
            """)
        .addSourceLines(
            "Bar.java",
            """
            package test;

            class Bar {
              public static Test.Foo create(int i) {
                // BUG: Diagnostic contains:
                return new AutoValue_Test_Foo(i);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negativeBuilder() {
    helper
        .addSourceLines(
            "Test.java",
            """
            package test;

            import com.google.auto.value.AutoValue;

            class Test {
              @AutoValue
              abstract static class Foo {
                abstract int foo();

                @AutoValue.Builder
                abstract static class Builder {
                  abstract Builder setFoo(int i);

                  abstract Foo build();
                }

                public static Builder builder() {
                  return new AutoValue_Test_Foo.Builder();
                }
              }
            }
            """)
        .doTest();
  }

  @Test
  public void negative() {
    helper
        .addSourceLines(
            "Test.java",
            """
            package test;

            import com.google.auto.value.AutoValue;

            class Test {
              @AutoValue
              abstract static class Foo {
                abstract int foo();

                public static Foo create(int i) {
                  return new AutoValue_Test_Foo(i);
                }
              }
            }
            """)
        .doTest();
  }

  @Test
  public void generatedCode() {
    helper
        .addSourceLines(
            "Test.java",
            """
            package test;

            import com.google.auto.value.AutoValue;

            class Test {
              @AutoValue
              abstract static class Foo {
                abstract int foo();
              }
            }
            """)
        .addSourceLines(
            "Bar.java",
            """
            package test;

            import javax.annotation.processing.Generated;

            @Generated("generator")
            class Bar {
              public static Test.Foo create(int i) {
                return new AutoValue_Test_Foo(i);
              }
            }
            """)
        .doTest();
  }

  @Test
  public void positiveAutoValueExtension() {
    helper
        .addSourceLines(
            "$$AutoValue_Foo.java",
            """
            package test;

            class $$AutoValue_Foo extends Test.Foo {}
            """)
        .addSourceLines(
            "Test.java",
            """
            package test;

            import com.google.auto.value.AutoValue;

            class Test {
              @AutoValue
              abstract static class Foo {}
            }
            """)
        .addSourceLines(
            "Bar.java",
            """
            package test;

            class Bar {
              public static Test.Foo create() {
                // BUG: Diagnostic contains:
                return new $$AutoValue_Foo();
              }
            }
            """)
        .doTest();
  }

  @Test
  public void positiveAutoValueExtension_noGeneratedAnnotation() {
    CompilationTestHelper.newInstance(AutoValueSubclassLeaked.class, getClass())
        .addSourceLines(
            "$AutoValue_Test_Foo.java",
            """
            package test;

            final class AutoValue_Test_Foo extends $AutoValue_Test_Foo {
              static final Test.Foo AUTO_VALUE = new AutoValue_Test_Foo();
            }
            """)
        .addSourceLines(
            "$AutoValue_Test_Foo.java",
            """
            package test;

            import javax.annotation.processing.Generated;

            @Generated("com.google.auto.value.processor.AutoValueProcessor")
            class $AutoValue_Test_Foo extends Test.Foo {}
            """)
        .addSourceLines(
            "Test.java",
            """
            package test;

            import com.google.auto.value.AutoValue;

            class Test {
              static final Test.Foo EXTENSION = new $AutoValue_Test_Foo();
              static final Test.Foo AUTO_VALUE = new AutoValue_Test_Foo();

              @AutoValue
              abstract static class Foo {}
            }
            """)
        .addSourceLines(
            "Bar.java",
            """
            package test;

            class Bar {
              // BUG: Diagnostic contains:
              static final Test.Foo EXTENSION = new $AutoValue_Test_Foo();
              // BUG: Diagnostic contains:
              static final Test.Foo AUTO_VALUE = new AutoValue_Test_Foo();
            }
            """)
        .doTest();
  }
}
