// 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 com.google.common.collect.ImmutableList;
import com.google.gerrit.entities.Project;
import com.google.gerrit.server.config.AllProjectsName;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
import com.google.gerrit.server.git.meta.MetaDataUpdate;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.StoredConfig;
import org.eclipse.jgit.storage.file.FileBasedConfig;
import org.eclipse.jgit.util.FS;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

public class ProjectConfigSchemaUpdateTest {
  private static final String ALL_PROJECTS = "All-The-Projects";

  @Rule public TemporaryFolder temporaryFolder = new TemporaryFolder();

  private SitePaths sitePaths;
  private ProjectConfigSchemaUpdate.Factory factory;
  private File allProjectsRepoFile;

  @Before
  public void setUp() throws Exception {
    sitePaths = new SitePaths(temporaryFolder.newFolder().toPath());
    Files.createDirectories(sitePaths.etc_dir);

    Path gitPath = sitePaths.resolve("git");

    StoredConfig gerritConfig = new FileBasedConfig(sitePaths.gerrit_config.toFile(), FS.DETECTED);
    gerritConfig.load();
    gerritConfig.setString("gerrit", null, "basePath", gitPath.toAbsolutePath().toString());
    gerritConfig.setString("gerrit", null, "allProjects", ALL_PROJECTS);
    gerritConfig.save();

    Files.createDirectories(sitePaths.resolve("git"));
    allProjectsRepoFile = gitPath.resolve("All-The-Projects.git").toFile();
    try (Repository repo = new FileRepository(allProjectsRepoFile)) {
      repo.create(true);
    }

    factory = new ProjectConfigSchemaUpdate.Factory(sitePaths, new AllProjectsName(ALL_PROJECTS));
  }

  @Test
  public void noBaseConfig() throws Exception {
    assertThat(getConfig().getString("foo", null, "bar")).isNull();

    try (Repository repo = new FileRepository(allProjectsRepoFile);
        TestRepository<Repository> tr = new TestRepository<>(repo)) {
      tr.branch("refs/meta/config").commit().add("project.config", "[foo]\nbar = baz").create();
    }

    assertThat(getConfig().getString("foo", null, "bar")).isEqualTo("baz");
  }

  @Test
  public void baseConfig() throws Exception {
    assertThat(getConfig().getString("foo", null, "bar")).isNull();

    Path baseConfigPath = sitePaths.etc_dir.resolve(ALL_PROJECTS).resolve("project.config");
    Files.createDirectories(baseConfigPath.getParent());
    Files.write(baseConfigPath, ImmutableList.of("[foo]", "bar = base"));

    assertThat(getConfig().getString("foo", null, "bar")).isEqualTo("base");

    try (Repository repo = new FileRepository(allProjectsRepoFile);
        TestRepository<Repository> tr = new TestRepository<>(repo)) {
      tr.branch("refs/meta/config").commit().add("project.config", "[foo]\nbar = baz").create();
    }

    assertThat(getConfig().getString("foo", null, "bar")).isEqualTo("baz");
  }

  private Config getConfig() throws Exception {
    try (Repository repo = new FileRepository(allProjectsRepoFile)) {
      return factory
          .read(
              new MetaDataUpdate(
                  GitReferenceUpdated.DISABLED, Project.nameKey(ALL_PROJECTS), repo, null))
          .getConfig();
    }
  }
}