// Copyright (C) 2016 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.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
import static com.google.gerrit.server.schema.AclUtil.grant;

import com.google.gerrit.common.data.AccessSection;
import com.google.gerrit.common.data.GroupReference;
import com.google.gerrit.common.data.Permission;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.GerritPersonIdent;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.MetaDataUpdate;
import com.google.gerrit.server.git.ProjectConfig;
import com.google.gerrit.server.group.SystemGroupBackend;
import com.google.gerrit.server.project.RefPattern;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;

import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Repository;

import java.io.IOException;

public class Schema_126 extends SchemaVersion {
  private static final String COMMIT_MSG =
      "Fix default permissions on user branches";

  private final GitRepositoryManager repoManager;
  private final AllUsersName allUsersName;
  private final PersonIdent serverUser;

  @Inject
  Schema_126(Provider<Schema_125> prior,
      GitRepositoryManager repoManager,
      AllUsersName allUsersName,
      @GerritPersonIdent PersonIdent serverUser) {
    super(prior);
    this.repoManager = repoManager;
    this.allUsersName = allUsersName;
    this.serverUser = serverUser;
  }

  @Override
  protected void migrateData(ReviewDb db, UpdateUI ui) throws OrmException {
    try (Repository git = repoManager.openRepository(allUsersName);
        MetaDataUpdate md = new MetaDataUpdate(GitReferenceUpdated.DISABLED,
            allUsersName, git)) {
      ProjectConfig config = ProjectConfig.read(md);

      String refsUsersShardedId =
          RefNames.REFS_USERS + "${" + RefPattern.USERID_SHARDED + "}";
      config.remove(config.getAccessSection(refsUsersShardedId));

      GroupReference registered = SystemGroupBackend.getGroup(REGISTERED_USERS);
      AccessSection users = config.getAccessSection(refsUsersShardedId, true);
      grant(config, users, Permission.READ, false, true, registered);
      grant(config, users, Permission.PUSH, false, true, registered);
      grant(config, users, Permission.SUBMIT, false, true, registered);

      md.getCommitBuilder().setAuthor(serverUser);
      md.getCommitBuilder().setCommitter(serverUser);
      md.setMessage(COMMIT_MSG);
      config.commit(md);
    } catch (ConfigInvalidException | IOException ex) {
      throw new OrmException(ex);
    }
  }
}