// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
//
// 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 google.registry.model.ofy;

import static com.google.common.truth.Truth.assertThat;
import static google.registry.util.DateTimeUtils.START_OF_TIME;
import static org.joda.time.DateTimeZone.UTC;

import com.google.common.collect.ImmutableMap;

import google.registry.config.TestRegistryConfig;
import google.registry.testing.AppEngineRule;
import google.registry.testing.ExceptionRule;
import google.registry.testing.RegistryConfigRule;

import org.joda.time.DateTime;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link CommitLogCheckpoint}. */
@RunWith(JUnit4.class)
public class CommitLogCheckpointTest {

  @Rule
  public final AppEngineRule appEngine = AppEngineRule.builder()
      .withDatastore()
      .build();

  @Rule
  public final RegistryConfigRule configRule = new RegistryConfigRule();

  @Rule
  public final ExceptionRule thrown = new ExceptionRule();

  private static final DateTime T1 = START_OF_TIME;
  private static final DateTime T2 = START_OF_TIME.plusMillis(1);
  private static final DateTime T3 = START_OF_TIME.plusMillis(2);

  @Before
  public void before() {
    // Use 3 buckets to make the tests below more realistic.
    configRule.override(new TestRegistryConfig() {
      @Override
      public int getCommitLogBucketCount() {
        return 3;
      }});
  }

  @Test
  public void test_getCheckpointTime() {
    DateTime now = DateTime.now(UTC);
    CommitLogCheckpoint checkpoint =
        CommitLogCheckpoint.create(now, ImmutableMap.of(1, T1, 2, T2, 3, T3));
    assertThat(checkpoint.getCheckpointTime()).isEqualTo(now);
  }

  @Test
  public void test_getBucketTimestamps() {
    CommitLogCheckpoint checkpoint =
        CommitLogCheckpoint.create(DateTime.now(UTC), ImmutableMap.of(1, T1, 2, T2, 3, T3));
    assertThat(checkpoint.getBucketTimestamps()).containsExactly(1, T1, 2, T2, 3, T3);
  }

  @Test
  public void test_getBucketTimestamps_whenOnlyOneBucket_stillWorks() {
    configRule.override(new TestRegistryConfig() {
      @Override
      public int getCommitLogBucketCount() {
        return 1;
      }});
    CommitLogCheckpoint checkpoint =
        CommitLogCheckpoint.create(DateTime.now(UTC), ImmutableMap.of(1, T1));
    assertThat(checkpoint.getBucketTimestamps()).containsExactly(1, T1);
  }

  @Test
  public void test_create_notEnoughBucketTimestamps_throws() {
    thrown.expect(IllegalArgumentException.class, "Bucket ids are incorrect");
    CommitLogCheckpoint.create(DateTime.now(UTC), ImmutableMap.of(1, T1, 2, T2));
  }

  @Test
  public void test_create_tooManyBucketTimestamps_throws() {
    thrown.expect(IllegalArgumentException.class, "Bucket ids are incorrect");
    CommitLogCheckpoint.create(DateTime.now(UTC), ImmutableMap.of(1, T1, 2, T2, 3, T3, 4, T1));
  }

  @Test
  public void test_create_wrongBucketIds_throws() {
    thrown.expect(IllegalArgumentException.class, "Bucket ids are incorrect");
    CommitLogCheckpoint.create(DateTime.now(UTC), ImmutableMap.of(0, T1, 1, T2, 2, T3));
  }
}