/*
 * Copyright 2015 Google Inc. 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.errorprone.matchers;

import static org.junit.Assert.assertTrue;

import com.google.errorprone.VisitorState;
import com.google.errorprone.scanner.Scanner;
import com.sun.source.tree.AnnotationTree;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for {@link AnnotationDoesNotHaveArgument}.
 *
 * @author mwacker@google.com (Mike Wacker)
 */
@RunWith(JUnit4.class)
public class AnnotationDoesNotHaveArgumentTest extends CompilerBasedAbstractTest {

  @Before
  public void createAnnotation() {
    writeFile("Annotation.java",
        "public @interface Annotation {",
        "  String value() default \"\";",
        "}");
  }

  @Test
  public void matchesWhenArgumentIsNotPresent() {
    writeFile("Class.java",
        "@Annotation",
        "public class Class {}");
    assertCompiles(annotationMatches(true));
  }

  @Test
  public void matchesWhenArgumentIsNotPresent_OtherArgumentPresent() {
    writeFile("Annotation2.java",
        "public @interface Annotation2 {",
        "  String value() default \"\";",
        "  String otherValue() default \"\";",
        "}");
    writeFile("Class.java",
        "@Annotation2(otherValue = \"literal\")",
        "public class Class {}");
    assertCompiles(annotationMatches(true));
  }

  @Test
  public void doesNotMatchWhenArgumentIsPresent_Implicit() {
    writeFile("Class.java",
        "@Annotation(\"literal\")",
        "public class Class {}");
    assertCompiles(annotationMatches(false));
  }

  @Test
  public void doesNotMatchWhenArgumentIsPresent_Explicit() {
    writeFile("Class.java",
        "@Annotation(value = \"literal\")",
        "public class Class {}");
    assertCompiles(annotationMatches(false));
  }

  private Scanner annotationMatches(final boolean shouldMatch) {
    final AnnotationDoesNotHaveArgument toMatch = new AnnotationDoesNotHaveArgument("value");
    return new Scanner() {
      @Override
      public Void visitAnnotation(AnnotationTree node, VisitorState visitorState) {
        assertTrue(node.toString(), !shouldMatch ^ toMatch.matches(node, visitorState));
        return super.visitAnnotation(node, visitorState);
      }
    };
  }
}