// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.common.options.processor;

import static com.google.common.truth.Truth.assertAbout;
import static com.google.testing.compile.JavaSourceSubjectFactory.javaSource;

import com.google.common.io.Resources;
import com.google.testing.compile.JavaFileObjects;
import javax.tools.JavaFileObject;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for the compile-time checks in {@link OptionProcessor}. */
@RunWith(JUnit4.class)
public class OptionProcessorTest {
  private static JavaFileObject getFile(String pathToFile) {
    return JavaFileObjects.forResource(
        Resources.getResource(
            "com/google/devtools/common/options/processor/optiontestsources/" + pathToFile));
  }

  @Test
  public void optionsInNonOptionBasesAreRejected() {
    assertAbout(javaSource())
        .that(getFile("OptionInNonOptionBase.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "@Option annotated fields can only be in classes that inherit from OptionsBase.");
  }

  @Test
  public void privatelyDeclaredOptionsAreRejected() {
    assertAbout(javaSource())
        .that(getFile("PrivateOptionField.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining("@Option annotated fields should be public.");
  }

  @Test
  public void protectedOptionsAreRejected() {
    assertAbout(javaSource())
        .that(getFile("ProtectedOptionField.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining("@Option annotated fields should be public.");
  }

  @Test
  public void staticOptionsAreRejected() {
    assertAbout(javaSource())
        .that(getFile("StaticOptionField.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining("@Option annotated fields should not be static.");
  }

  @Test
  public void finalOptionsAreRejected() {
    assertAbout(javaSource())
        .that(getFile("FinalOptionField.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining("@Option annotated fields should not be final.");
  }

  @Test
  public void namelessOptionsAreRejected() {
    assertAbout(javaSource())
        .that(getFile("NamelessOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining("Option must have an actual name.");
  }

  @Test
  public void badNamesAreRejected() {
    assertAbout(javaSource())
        .that(getFile("BadNameForDocumentedOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Options that are used on the command line as flags must have names made from word "
                + "characters only.");
    assertAbout(javaSource())
        .that(getFile("BadNameWithEqualsSign.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Options that are used on the command line as flags must have names made from word "
                + "characters only.");
  }

  @Test
  public void badNamesForHiddenOptionsPass() {
    assertAbout(javaSource())
        .that(getFile("BadNameForInternalOption.java"))
        .processedWith(new OptionProcessor())
        .compilesWithoutError();
  }

  @Test
  public void deprecatedCategorySaysUndocumented() {
    assertAbout(javaSource())
        .that(getFile("DeprecatedUndocumentedCategory.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Documentation level is no longer read from the option category. Category "
                + "\"undocumented\" is disallowed, see OptionMetadataTags for the relevant tags.");
  }

  @Test
  public void deprecatedCategorySaysHidden() {
    assertAbout(javaSource())
        .that(getFile("DeprecatedHiddenCategory.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Documentation level is no longer read from the option category. Category "
                + "\"hidden\" is disallowed, see OptionMetadataTags for the relevant tags.");
  }

  @Test
  public void deprecatedCategorySaysInternal() {
    assertAbout(javaSource())
        .that(getFile("DeprecatedInternalCategory.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Documentation level is no longer read from the option category. Category "
                + "\"internal\" is disallowed, see OptionMetadataTags for the relevant tags.");
  }

  @Test
  public void optionMustHaveEffectExplicitlyStated() {
    assertAbout(javaSource())
        .that(getFile("EffectlessOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option does not list at least one OptionEffectTag. "
                + "If the option has no effect, please be explicit and add NO_OP. "
                + "Otherwise, add a tag representing its effect.");
  }

  @Test
  public void contradictingEffectTagsAreRejected() {
    assertAbout(javaSource())
        .that(getFile("OptionWithContradictingNoopEffects.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option includes NO_OP with other effects. This doesn't make much sense. "
                + "Please remove NO_OP or the actual effects from the list, whichever is correct.");
    assertAbout(javaSource())
        .that(getFile("OptionWithContradictingUnknownEffects.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option includes UNKNOWN with other, known, effects. "
                + "Please remove UNKNOWN from the list.");
  }

  @Test
  public void contradictoryDocumentationCategoryIsRejected() {
    assertAbout(javaSource())
        .that(getFile("HiddenOptionWithCategory.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option has metadata tag HIDDEN but does not have category UNDOCUMENTED. "
                + "Please fix.");
    assertAbout(javaSource())
        .that(getFile("InternalOptionWithCategory.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option has metadata tag INTERNAL but does not have category UNDOCUMENTED. "
                + "Please fix.");
  }

  @Test
  public void defaultConvertersAreFound() {
    assertAbout(javaSource())
        .that(getFile("AllDefaultConverters.java"))
        .processedWith(new OptionProcessor())
        .compilesWithoutError();
  }

  @Test
  public void converterReturnsListForAllowMultipleIsAllowed() {
    assertAbout(javaSource())
        .that(getFile("MultipleOptionWithListTypeConverter.java"))
        .processedWith(new OptionProcessor())
        .compilesWithoutError();
  }

  @Test
  public void correctCustomConverterForPrimitiveTypePasses() {
    assertAbout(javaSource())
        .that(getFile("CorrectCustomConverterForPrimitiveType.java"))
        .processedWith(new OptionProcessor())
        .compilesWithoutError();
  }

  @Test
  public void converterlessOptionIsRejected() {
    assertAbout(javaSource())
        .that(getFile("ConverterlessOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Cannot find valid converter for option of type "
                + "java.util.Map<java.lang.String,java.lang.String>");
  }

  @Test
  public void allowMultipleOptionWithCollectionTypeIsRejected() {
    assertAbout(javaSource())
        .that(getFile("CollectionTypeForAllowMultipleOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option that allows multiple occurrences must be assignable to type java.util.List<E>,"
                + " but is of type java.util.Collection<java.lang.String>");
  }

  @Test
  public void allowMultipleOptionWithNonListTypeIsRejected() {
    assertAbout(javaSource())
        .that(getFile("NonListTypeForAllowMultipleOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Option that allows multiple occurrences must be assignable to type java.util.List<E>,"
                + " but is of type java.lang.String");
  }

  @Test
  public void allowMultipleOptionWithImmutableListTypeIsAllowed() {
    assertAbout(javaSource())
        .that(getFile("ImmutableListTypeForAllowMultipleOption.java"))
        .processedWith(new OptionProcessor())
        .compilesWithoutError();
  }

  @Test
  public void allowMultipleOptionsWithDefaultValuesAreRejected() {
    assertAbout(javaSource())
        .that(getFile("AllowMultipleOptionWithDefaultValue.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Default values for multiple options are not allowed - use \"null\" special value");
  }

  @Test
  public void optionWithIncorrectConverterIsRejected() {
    assertAbout(javaSource())
        .that(getFile("IncorrectConverterType.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Type of field (java.lang.String) must be assignable from the converter's return type "
                + "(java.lang.Integer)");
  }

  @Test
  public void allowMultipleOptionWithIncorrectConverterIsRejected() {
    assertAbout(javaSource())
        .that(getFile("IncorrectConverterTypeForAllowMultipleOption.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Type of field (java.lang.String) must be assignable from the converter's return type "
                + "(java.lang.Integer)");
  }

  @Test
  public void expansionOptionThatAllowsMultipleIsRejected() {
    assertAbout(javaSource())
        .that(getFile("ExpansionOptionWithAllowMultiple.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Can't set an option to accumulate multiple values and let it expand to other flags.");
  }

  @Test
  public void expansionOptionWithImplicitRequirementIsRejected() {
    assertAbout(javaSource())
        .that(getFile("ExpansionOptionWithImplicitRequirement.java"))
        .processedWith(new OptionProcessor())
        .failsToCompile()
        .withErrorContaining(
            "Can't set an option to be both an expansion option and have implicit requirements.");
  }
}
