// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.utils.codeinspector;

import com.google.common.collect.ImmutableList;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

public class Matchers {

  private static String type(Subject subject) {
    String type = "<unknown subject type>";
    if (subject instanceof ClassSubject) {
      type = "class";
    } else if (subject instanceof MethodSubject) {
      type = "method";
    } else if (subject instanceof FieldSubject) {
      type = "field";
    }
    return type;
  }

  private static String name(Subject subject) {
    String name = "<unknown>";
    if (subject instanceof ClassSubject) {
      name = ((ClassSubject) subject).getOriginalName();
    } else if (subject instanceof MethodSubject) {
      name = ((MethodSubject) subject).getOriginalName();
    } else if (subject instanceof FieldSubject) {
      name = ((FieldSubject) subject).getOriginalName();
    }
    return name;
  }

  public static Matcher<Subject> isPresent() {
    return new TypeSafeMatcher<Subject>() {
      @Override
      public boolean matchesSafely(final Subject subject) {
        return subject.isPresent();
      }

      @Override
      public void describeTo(final Description description) {
        description.appendText(" present");
      }

      @Override
      public void describeMismatchSafely(final Subject subject, Description description) {
        description
            .appendText(type(subject) + " ").appendValue(name(subject)).appendText(" was not");
      }
    };
  }

  public static Matcher<Subject> isRenamed() {
    return new TypeSafeMatcher<Subject>() {
      @Override
      protected boolean matchesSafely(Subject subject) {
        return subject.isPresent() && subject.isRenamed();
      }

      @Override
      public void describeTo(Description description) {
        description.appendText(" renamed");
      }

      @Override
      public void describeMismatchSafely(final Subject subject, Description description) {
        description
            .appendText(type(subject) + " ").appendValue(name(subject)).appendText(" was not");
      }
    };
  }

  public static Matcher<Subject> isNotRenamed() {
    return new TypeSafeMatcher<Subject>() {
      @Override
      protected boolean matchesSafely(Subject subject) {
        return subject.isPresent() && !subject.isRenamed();
      }

      @Override
      public void describeTo(Description description) {
        description.appendText(" not renamed");
      }

      @Override
      public void describeMismatchSafely(final Subject subject, Description description) {
        description
            .appendText(type(subject) + " ").appendValue(name(subject)).appendText(" was");
      }
    };
  }

  public static Matcher<ClassSubject> hasDefaultConstructor() {
    return new TypeSafeMatcher<ClassSubject>() {
      @Override
      public boolean matchesSafely(final ClassSubject clazz) {
        return clazz.init(ImmutableList.of()).isPresent();
      }

      @Override
      public void describeTo(final Description description) {
        description.appendText("class having default constructor");
      }

      @Override
      public void describeMismatchSafely(final ClassSubject clazz, Description description) {
        description
            .appendText("class ").appendValue(clazz.getOriginalName()).appendText(" did not");
      }
    };
  }

  public static Matcher<MethodSubject> isAbstract() {
    return new TypeSafeMatcher<MethodSubject>() {
      @Override
      public boolean matchesSafely(final MethodSubject method) {
        return method.isPresent() && method.isAbstract();
      }

      @Override
      public void describeTo(final Description description) {
        description.appendText("method abstract");
      }

      @Override
      public void describeMismatchSafely(final MethodSubject method, Description description) {
        description
            .appendText("method ").appendValue(method.getOriginalName()).appendText(" was not");
      }
    };
  }

  public static Matcher<MethodSubject> isPublic() {
    return new TypeSafeMatcher<MethodSubject>() {
      @Override
      public boolean matchesSafely(final MethodSubject method) {
        return method.isPresent() && method.isPublic();
      }

      @Override
      public void describeTo(final Description description) {
        description.appendText("method public");
      }

      @Override
      public void describeMismatchSafely(final MethodSubject method, Description description) {
        description
            .appendText("method ").appendValue(method.getOriginalName()).appendText(" was not");
      }
    };
  }
}