/*
 * SonarQube
 * Copyright (C) 2009-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.core.extension;

import com.google.common.collect.ImmutableSet;
import java.util.Collections;
import java.util.Random;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import org.junit.Test;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;
import static org.assertj.core.api.Assertions.assertThatThrownBy;

public class CoreExtensionsLoaderTest {

  private CoreExtensionRepository coreExtensionRepository = mock(CoreExtensionRepository.class);
  private ServiceLoaderWrapper serviceLoaderWrapper = mock(ServiceLoaderWrapper.class);
  private CoreExtensionsLoader underTest = new CoreExtensionsLoader(coreExtensionRepository, serviceLoaderWrapper);

  @Test
  public void load_has_no_effect_if_there_is_no_ServiceLoader_for_CoreExtension_class() {
    when(serviceLoaderWrapper.load(any())).thenReturn(Collections.emptySet());

    underTest.load();

    verify(serviceLoaderWrapper).load(CoreExtensionsLoader.class.getClassLoader());
    verify(coreExtensionRepository).setLoadedCoreExtensions(Collections.emptySet());
    verifyNoMoreInteractions(serviceLoaderWrapper, coreExtensionRepository);
  }

  @Test
  public void load_sets_loaded_core_extensions_into_repository() {
    Set<CoreExtension> coreExtensions = IntStream.range(0, 1 + new Random().nextInt(5))
      .mapToObj(i -> newCoreExtension("core_ext_" + i))
      .collect(Collectors.toSet());
    when(serviceLoaderWrapper.load(any())).thenReturn(coreExtensions);

    underTest.load();

    verify(serviceLoaderWrapper).load(CoreExtensionsLoader.class.getClassLoader());
    verify(coreExtensionRepository).setLoadedCoreExtensions(coreExtensions);
    verifyNoMoreInteractions(serviceLoaderWrapper, coreExtensionRepository);
  }

  @Test
  public void load_fails_with_ISE_if_multiple_core_extensions_declare_same_name() {
    Set<CoreExtension> coreExtensions = ImmutableSet.of(newCoreExtension("a"), newCoreExtension("a"));
    when(serviceLoaderWrapper.load(any())).thenReturn(coreExtensions);

    assertThatThrownBy(() -> underTest.load())
      .isInstanceOf(IllegalStateException.class)
      .hasMessage("Multiple core extensions declare the following names: a");
  }

  @Test
  public void load_fails_with_ISE_if_multiple_core_extensions_declare_same_names() {
    Set<CoreExtension> coreExtensions = ImmutableSet.of(newCoreExtension("a"), newCoreExtension("a"), newCoreExtension("b"), newCoreExtension("b"));
    when(serviceLoaderWrapper.load(any())).thenReturn(coreExtensions);

    assertThatThrownBy(() -> underTest.load())
      .isInstanceOf(IllegalStateException.class)
      .hasMessage("Multiple core extensions declare the following names: a, b");
  }

  private static CoreExtension newCoreExtension(String name) {
    CoreExtension res = mock(CoreExtension.class);
    when(res.getName()).thenReturn(name);
    return res;
  }
}
