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// Copyright (C) 2009 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.args4j;

import static com.google.gerrit.util.cli.Localizable.localizable;

import com.google.gerrit.entities.AccountGroup;
import com.google.gerrit.entities.GroupDescription;
import com.google.gerrit.entities.GroupReference;
import com.google.gerrit.entities.InternalGroup;
import com.google.gerrit.server.account.GroupBackend;
import com.google.gerrit.server.account.GroupBackends;
import com.google.gerrit.server.account.GroupCache;
import com.google.gerrit.server.group.InternalGroupDescription;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import java.util.Optional;
import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineParser;
import org.kohsuke.args4j.OptionDef;
import org.kohsuke.args4j.spi.OptionHandler;
import org.kohsuke.args4j.spi.Parameters;
import org.kohsuke.args4j.spi.Setter;

public class AccountGroupUUIDHandler extends OptionHandler {
  private final GroupBackend groupBackend;
  private final GroupCache groupCache;

  @Inject
  public AccountGroupUUIDHandler(
      final GroupBackend groupBackend,
      @Assisted final CmdLineParser parser,
      @Assisted final OptionDef option,
      @Assisted final Setter setter,
      GroupCache groupCache) {
    super(parser, option, setter);
    this.groupBackend = groupBackend;
    this.groupCache = groupCache;
  }

  @Override
  public final int parseArguments(Parameters params) throws CmdLineException {
    final String n = params.getParameter(0);
    AccountGroup.UUID uuid = AccountGroup.uuid(n);
    if (groupBackend.handles(uuid)) {
      GroupDescription.Basic d = groupBackend.get(uuid);
      if (d != null) {
        setter.addValue(uuid);
        return 1;
      }
    }

    // Might be a numeric AccountGroup.Id. -> Internal group.
    if (n.matches("^[1-9][0-9]*$")) {
      try {
        AccountGroup.Id groupId = AccountGroup.Id.parse(n);
        Optional groupInternal = groupCache.get(groupId);
        if (groupInternal.isPresent()) {
          uuid = new InternalGroupDescription(groupInternal.get()).getGroupUUID();
          setter.addValue(uuid);
          return 1;
        }
      } catch (IllegalArgumentException e) {
        // Ignored
      }
    }

    GroupReference group = GroupBackends.findExactSuggestion(groupBackend, n);
    if (group == null) {
      throw new CmdLineException(owner, localizable("Group \"%s\" does not exist"), n);
    }
    setter.addValue(group.getUUID());
    return 1;
  }

  @Override
  public final String getDefaultMetaVariable() {
    return "GROUP";
  }
}