/*
 * Copyright (C) 2007 Google Inc.
 *
 * 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.inject.util;

import com.google.common.base.Objects;
import com.google.common.testing.EqualsTester;
import com.google.inject.Provider;
import javax.inject.Inject;
import junit.framework.TestCase;

/**
 * Unit tests for {@link Providers}.
 *
 * @author Kevin Bourrillion (kevinb9n@gmail.com)
 */
public class ProvidersTest extends TestCase {

  public void testOfInstance() {
    String foo = "foo";
    Provider<String> p = Providers.of(foo);
    assertSame(foo, p.get());
    assertSame(foo, p.get());
  }

  public void testOfNull() {
    Provider<String> p = Providers.of(null);
    assertNull(p.get());
  }

  public void testOfEquality() {
    new EqualsTester()
        .addEqualityGroup(Providers.of(null), Providers.of(null))
        .addEqualityGroup(Providers.of("Hello"), Providers.of("Hello"))
        .testEquals();
  }

  public void testGuicifyEquality() {
    new EqualsTester()
        .addEqualityGroup(
            Providers.guicify(new JavaxProvider(10)), Providers.guicify(new JavaxProvider(10)))
        .addEqualityGroup(
            Providers.guicify(new JavaxProvider(11)), Providers.guicify(new JavaxProvider(11)))
        .addEqualityGroup(
            Providers.guicify(new JavaxProviderWithDependencies()),
            Providers.guicify(new JavaxProviderWithDependencies()))
        .addEqualityGroup(
            Providers.guicify(new JakartaProvider(10)), Providers.guicify(new JakartaProvider(10)))
        .addEqualityGroup(
            Providers.guicify(new JakartaProvider(11)), Providers.guicify(new JakartaProvider(11)))
        .addEqualityGroup(
            Providers.guicify(new JakartaProviderWithDependencies()),
            Providers.guicify(new JakartaProviderWithDependencies()))
        .testEquals();
  }

  private static class JavaxProvider implements javax.inject.Provider<Integer> {
    private final int value;

    public JavaxProvider(int value) {
      this.value = value;
    }

    @Override
    public Integer get() {
      return value;
    }

    @Override
    public int hashCode() {
      return Objects.hashCode(value);
    }

    @Override
    public boolean equals(Object obj) {
      return (obj instanceof JavaxProvider) && (value == ((JavaxProvider) obj).value);
    }
  }

  private static class JakartaProvider implements jakarta.inject.Provider<Integer> {
    private final int value;

    public JakartaProvider(int value) {
      this.value = value;
    }

    @Override
    public Integer get() {
      return value;
    }

    @Override
    public int hashCode() {
      return Objects.hashCode(value);
    }

    @Override
    public boolean equals(Object obj) {
      return (obj instanceof JakartaProvider) && (value == ((JakartaProvider) obj).value);
    }
  }

  private static class JavaxProviderWithDependencies implements javax.inject.Provider<Integer> {
    private int value;

    @Inject
    void setValue(int value) {
      this.value = value;
    }

    @Override
    public Integer get() {
      return value;
    }

    @Override
    public int hashCode() {
      return 42;
    }

    @Override
    public boolean equals(Object obj) {
      return (obj instanceof JavaxProviderWithDependencies);
    }
  }

  private static class JakartaProviderWithDependencies implements jakarta.inject.Provider<Integer> {
    private int value;

    @Inject
    void setValue(int value) {
      this.value = value;
    }

    @Override
    public Integer get() {
      return value;
    }

    @Override
    public int hashCode() {
      return 42;
    }

    @Override
    public boolean equals(Object obj) {
      return (obj instanceof JakartaProviderWithDependencies);
    }
  }
}
