// Copyright (C) 2014 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.account;

import static com.google.gerrit.server.config.ConfigUtil.loadSection;

import com.google.gerrit.extensions.client.EditPreferencesInfo;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.UserConfigSections;
import com.google.gerrit.server.permissions.GlobalPermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.eclipse.jgit.lib.Repository;

@Singleton
public class GetEditPreferences implements RestReadView<AccountResource> {
  private final Provider<CurrentUser> self;
  private final PermissionBackend permissionBackend;
  private final AllUsersName allUsersName;
  private final GitRepositoryManager gitMgr;

  @Inject
  GetEditPreferences(
      Provider<CurrentUser> self,
      PermissionBackend permissionBackend,
      AllUsersName allUsersName,
      GitRepositoryManager gitMgr) {
    this.self = self;
    this.permissionBackend = permissionBackend;
    this.allUsersName = allUsersName;
    this.gitMgr = gitMgr;
  }

  @Override
  public EditPreferencesInfo apply(AccountResource rsrc)
      throws AuthException, IOException, ConfigInvalidException, PermissionBackendException {
    if (!self.get().hasSameAccountId(rsrc.getUser())) {
      permissionBackend.user(self).check(GlobalPermission.MODIFY_ACCOUNT);
    }

    return readFromGit(rsrc.getUser().getAccountId(), gitMgr, allUsersName, null);
  }

  static EditPreferencesInfo readFromGit(
      Account.Id id, GitRepositoryManager gitMgr, AllUsersName allUsersName, EditPreferencesInfo in)
      throws IOException, ConfigInvalidException, RepositoryNotFoundException {
    try (Repository git = gitMgr.openRepository(allUsersName)) {
      VersionedAccountPreferences p = VersionedAccountPreferences.forUser(id);
      p.load(git);

      return loadSection(
          p.getConfig(),
          UserConfigSections.EDIT,
          null,
          new EditPreferencesInfo(),
          EditPreferencesInfo.defaults(),
          in);
    }
  }
}