// Copyright (C) 2011 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.sshd.commands;

import static com.google.gerrit.sshd.CommandMetaData.Mode.MASTER_OR_SLAVE;

import com.google.common.base.Objects;
import com.google.common.base.Strings;
import com.google.gerrit.extensions.restapi.Url;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.account.GetGroups;
import com.google.gerrit.server.account.GroupCache;
import com.google.gerrit.server.account.GroupControl;
import com.google.gerrit.server.group.GroupJson;
import com.google.gerrit.server.group.GroupJson.GroupInfo;
import com.google.gerrit.server.group.ListGroups;
import com.google.gerrit.server.ioutil.ColumnFormatter;
import com.google.gerrit.sshd.BaseCommand;
import com.google.gerrit.sshd.CommandMetaData;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;

import org.apache.sshd.server.Environment;
import org.kohsuke.args4j.Option;

import java.io.PrintWriter;

@CommandMetaData(name = "ls-groups", description = "List groups visible to the caller",
  runsAt = MASTER_OR_SLAVE)
public class ListGroupsCommand extends BaseCommand {
  @Inject
  private MyListGroups impl;

  @Override
  public void start(final Environment env) {
    startThread(new CommandRunnable() {
      @Override
      public void run() throws Exception {
        parseCommandLine(impl);
        if (impl.getUser() != null && !impl.getProjects().isEmpty()) {
          throw new UnloggedFailure(1, "fatal: --user and --project options are not compatible.");
        }
        final PrintWriter stdout = toPrintWriter(out);
        try {
          impl.display(stdout);
        } finally {
          stdout.flush();
        }
      }
    });
  }

  private static class MyListGroups extends ListGroups {
    @Option(name = "--verbose", aliases = {"-v"},
        usage = "verbose output format with tab-separated columns for the " +
            "group name, UUID, description, owner group name, " +
            "owner group UUID, and whether the group is visible to all")
    private boolean verboseOutput;

    @Inject
    MyListGroups(final GroupCache groupCache,
        final GroupControl.Factory groupControlFactory,
        final GroupControl.GenericFactory genericGroupControlFactory,
        final Provider<IdentifiedUser> identifiedUser,
        final IdentifiedUser.GenericFactory userFactory,
        final Provider<GetGroups> accountGetGroups,
        final GroupJson json) {
      super(groupCache, groupControlFactory, genericGroupControlFactory,
          identifiedUser, userFactory, accountGetGroups, json);
    }

    void display(final PrintWriter out) throws OrmException {
      final ColumnFormatter formatter = new ColumnFormatter(out, '\t');
      for (final GroupInfo info : get()) {
        formatter.addColumn(Objects.firstNonNull(info.name, "n/a"));
        if (verboseOutput) {
          AccountGroup o = info.ownerId != null
              ? groupCache.get(new AccountGroup.UUID(Url.decode(info.ownerId)))
              : null;

          formatter.addColumn(Url.decode(info.id));
          formatter.addColumn(Strings.nullToEmpty(info.description));
          formatter.addColumn(o != null ? o.getName() : "n/a");
          formatter.addColumn(o != null ? o.getGroupUUID().get() : "");
          formatter.addColumn(Boolean.toString(Objects.firstNonNull(
              info.options.visibleToAll, Boolean.FALSE)));
        }
        formatter.nextLine();
      }
      formatter.finish();
    }
  }
}