// Copyright (C) 2018 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.schema;

import static com.google.common.truth.Truth.assertThat;
import static com.google.gerrit.entities.RefNames.REFS_VERSION;
import static com.google.gerrit.testing.GerritJUnit.assertThrows;

import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.server.config.AllProjectsName;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.testing.InMemoryRepositoryManager;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.ObjectId;
import org.junit.Before;
import org.junit.Test;

public class NoteDbSchemaVersionManagerTest {
  private NoteDbSchemaVersionManager manager;
  private TestRepository<?> tr;

  @Before
  public void setUp() throws Exception {
    AllProjectsName allProjectsName = new AllProjectsName("The-Projects");
    GitRepositoryManager repoManager = new InMemoryRepositoryManager();
    tr = new TestRepository<>(repoManager.createRepository(allProjectsName));
    manager = new NoteDbSchemaVersionManager(allProjectsName, repoManager);
  }

  @Test
  public void readMissing() throws Exception {
    assertThat(manager.read()).isEqualTo(0);
  }

  @Test
  public void read() throws Exception {
    tr.update(REFS_VERSION, tr.blob("123"));
    assertThat(manager.read()).isEqualTo(123);
  }

  @Test
  public void readInvalid() throws Exception {
    ObjectId blobId = tr.blob(" 1 2 3 ");
    tr.update(REFS_VERSION, blobId);
    StorageException thrown = assertThrows(StorageException.class, () -> manager.read());
    assertThat(thrown)
        .hasMessageThat()
        .isEqualTo("invalid value in refs/meta/version blob at " + blobId.name());
  }

  @Test
  public void incrementFromMissing() throws Exception {
    manager.increment(123);
    assertThat(manager.read()).isEqualTo(124);
  }

  @Test
  public void increment() throws Exception {
    tr.update(REFS_VERSION, tr.blob("123"));
    manager.increment(123);
    assertThat(manager.read()).isEqualTo(124);
  }

  @Test
  public void incrementWrongOldVersion() throws Exception {
    tr.update(REFS_VERSION, tr.blob("123"));
    StorageException thrown = assertThrows(StorageException.class, () -> manager.increment(456));
    assertThat(thrown)
        .hasMessageThat()
        .isEqualTo("Expected old version 456 for refs/meta/version, found 123");
  }
}