// Copyright (C) 2014 The Android Open Source Project
//
// 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.gerrit.server.account;

import static com.google.gerrit.server.group.SystemGroupBackend.ANONYMOUS_USERS;
import static com.google.gerrit.server.group.SystemGroupBackend.PROJECT_OWNERS;
import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.AdditionalMatchers.not;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.reviewdb.client.AccountGroup.UUID;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.group.SystemGroupBackend;
import com.google.gerrit.server.plugincontext.PluginContext.PluginMetrics;
import com.google.gerrit.server.plugincontext.PluginSetContext;
import java.util.Set;
import org.eclipse.jgit.lib.Config;
import org.junit.Before;
import org.junit.Test;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

public class UniversalGroupBackendTest {
  private static final AccountGroup.UUID OTHER_UUID = AccountGroup.uuid("other");

  private UniversalGroupBackend backend;
  private IdentifiedUser user;

  private DynamicSet<GroupBackend> backends;

  @Before
  public void setup() {
    user = mock(IdentifiedUser.class);
    backends = new DynamicSet<>();
    backends.add("gerrit", new SystemGroupBackend(new Config()));
    backend =
        new UniversalGroupBackend(
            new PluginSetContext<>(backends, PluginMetrics.DISABLED_INSTANCE));
  }

  @Test
  public void handles() {
    assertTrue(backend.handles(ANONYMOUS_USERS));
    assertTrue(backend.handles(PROJECT_OWNERS));
    assertFalse(backend.handles(OTHER_UUID));
  }

  @Test
  public void get() {
    assertEquals("Registered Users", backend.get(REGISTERED_USERS).getName());
    assertEquals("Project Owners", backend.get(PROJECT_OWNERS).getName());
    assertNull(backend.get(OTHER_UUID));
  }

  @Test
  public void suggest() {
    assertTrue(backend.suggest("X", null).isEmpty());
    assertEquals(1, backend.suggest("project", null).size());
    assertEquals(1, backend.suggest("reg", null).size());
  }

  @Test
  public void sytemGroupMemberships() {
    GroupMembership checker = backend.membershipsOf(user);
    assertTrue(checker.contains(REGISTERED_USERS));
    assertFalse(checker.contains(OTHER_UUID));
    assertFalse(checker.contains(PROJECT_OWNERS));
  }

  @Test
  public void knownGroups() {
    GroupMembership checker = backend.membershipsOf(user);
    Set<UUID> knownGroups = checker.getKnownGroups();
    assertEquals(2, knownGroups.size());
    assertTrue(knownGroups.contains(REGISTERED_USERS));
    assertTrue(knownGroups.contains(ANONYMOUS_USERS));
  }

  @Test
  public void otherMemberships() {
    final AccountGroup.UUID handled = AccountGroup.uuid("handled");
    final AccountGroup.UUID notHandled = AccountGroup.uuid("not handled");
    final IdentifiedUser member = mock(IdentifiedUser.class);
    final IdentifiedUser notMember = mock(IdentifiedUser.class);

    GroupBackend backend = mock(GroupBackend.class);
    when(backend.handles(eq(handled))).thenReturn(true);
    when(backend.handles(not(eq(handled)))).thenReturn(false);
    when(backend.membershipsOf(any(IdentifiedUser.class)))
        .thenAnswer(
            new Answer<GroupMembership>() {
              @Override
              public GroupMembership answer(InvocationOnMock invocation) {
                GroupMembership membership = mock(GroupMembership.class);
                when(membership.contains(eq(handled)))
                    .thenReturn(invocation.getArguments()[0] == member);
                when(membership.contains(eq(notHandled))).thenReturn(false);
                return membership;
              }
            });

    backends = new DynamicSet<>();
    backends.add("gerrit", backend);
    backend =
        new UniversalGroupBackend(
            new PluginSetContext<>(backends, PluginMetrics.DISABLED_INSTANCE));

    GroupMembership checker = backend.membershipsOf(member);
    assertFalse(checker.contains(REGISTERED_USERS));
    assertFalse(checker.contains(OTHER_UUID));
    assertTrue(checker.contains(handled));
    assertFalse(checker.contains(notHandled));
    checker = backend.membershipsOf(notMember);
    assertFalse(checker.contains(handled));
    assertFalse(checker.contains(notHandled));
  }
}