// Copyright (C) 2019 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.acceptance.api.change;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableList;
import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.NoHttpd;
import com.google.gerrit.extensions.common.ChangeInfo;
import com.google.gerrit.extensions.restapi.TopLevelResource;
import com.google.gerrit.server.restapi.change.QueryChanges;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.util.List;
import org.junit.Test;

@NoHttpd
public class QueryChangesIT extends AbstractDaemonTest {

  @Inject private Provider<QueryChanges> queryChangesProvider;

  @Test
  @SuppressWarnings("unchecked")
  public void multipleQueriesInOneRequestCanContainSameChange() throws Exception {
    String cId1 = createChange().getChangeId();
    String cId2 = createChange().getChangeId();
    int numericId1 = gApi.changes().id(cId1).get()._number;
    int numericId2 = gApi.changes().id(cId2).get()._number;

    gApi.changes().id(cId2).setWorkInProgress();

    QueryChanges queryChanges = queryChangesProvider.get();

    queryChanges.addQuery("is:open repo:" + project.get());
    queryChanges.addQuery("is:wip repo:" + project.get());

    List<List<ChangeInfo>> result =
        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE);
    assertThat(result).hasSize(2);
    assertThat(result.get(0)).hasSize(2);
    assertThat(result.get(1)).hasSize(1);

    List<Integer> firstResultIds =
        ImmutableList.of(result.get(0).get(0)._number, result.get(0).get(1)._number);
    assertThat(firstResultIds).containsExactly(numericId1, numericId2);
    assertThat(result.get(1).get(0)._number).isEqualTo(numericId2);
  }

  @Test
  @SuppressWarnings("unchecked")
  public void moreChangesIndicatorDoesNotWronglyCopyToUnrelatedChanges() throws Exception {
    String queryWithMoreChanges = "is:wip limit:1 repo:" + project.get();
    String queryWithNoMoreChanges = "is:open limit:10 repo:" + project.get();
    createChange().getChangeId();
    String cId2 = createChange().getChangeId();
    String cId3 = createChange().getChangeId();
    gApi.changes().id(cId2).setWorkInProgress();
    gApi.changes().id(cId3).setWorkInProgress();

    // Run the capped query first
    QueryChanges queryChanges = queryChangesProvider.get();
    queryChanges.addQuery(queryWithMoreChanges);
    queryChanges.addQuery(queryWithNoMoreChanges);
    List<List<ChangeInfo>> result =
        (List<List<ChangeInfo>>) queryChanges.apply(TopLevelResource.INSTANCE);
    assertThat(result).hasSize(2);
    assertThat(result.get(0)).hasSize(1);
    assertThat(result.get(1)).hasSize(3);
    // _moreChanges is set on the first response, but not on the second.
    assertThat(result.get(0).get(0)._moreChanges).isTrue();
    assertNoChangeHasMoreChangesSet(result.get(1));

    // Run the capped query second
    QueryChanges queryChanges2 = queryChangesProvider.get();
    queryChanges2.addQuery(queryWithNoMoreChanges);
    queryChanges2.addQuery(queryWithMoreChanges);
    List<List<ChangeInfo>> result2 =
        (List<List<ChangeInfo>>) queryChanges2.apply(TopLevelResource.INSTANCE);
    assertThat(result2).hasSize(2);
    assertThat(result2.get(0)).hasSize(3);
    assertThat(result2.get(1)).hasSize(1);
    // _moreChanges is set on the second response, but not on the first.
    assertNoChangeHasMoreChangesSet(result2.get(0));
    assertThat(result2.get(1).get(0)._moreChanges).isTrue();
  }

  private static void assertNoChangeHasMoreChangesSet(List<ChangeInfo> results) {
    for (ChangeInfo info : results) {
      assertThat(info._moreChanges).isNull();
    }
  }
}