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// Copyright (C) 2013 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.restapi.change;

import static com.google.gerrit.server.config.GerritConfigListenerHelper.acceptIfChanged;

import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.common.AccountVisibility;
import com.google.gerrit.server.change.ReviewerModifier;
import com.google.gerrit.server.config.ConfigKey;
import com.google.gerrit.server.config.GerritConfigListener;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.inject.Inject;
import org.eclipse.jgit.lib.Config;
import org.kohsuke.args4j.Option;

public class SuggestReviewers {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();

  public static final boolean DEFAULT_SKIP_SERVICE_USERS = true;

  private static final int DEFAULT_MAX_SUGGESTED = 10;

  protected final ReviewersUtil reviewersUtil;

  private final boolean suggestAccounts;
  private final int maxAllowed;
  private final int maxAllowedWithoutConfirmation;
  protected int limit;
  protected String query;
  protected final int maxSuggestedReviewers;
  protected boolean skipServiceUsers;

  @Option(
      name = "--limit",
      aliases = {"-n"},
      metaVar = "CNT",
      usage = "maximum number of reviewers to list")
  public void setLimit(int l) {
    this.limit = l <= 0 ? maxSuggestedReviewers : Math.min(l, maxSuggestedReviewers);
  }

  @Option(
      name = "--query",
      aliases = {"-q"},
      metaVar = "QUERY",
      usage = "match reviewers query")
  public void setQuery(String q) {
    this.query = q;
  }

  public String getQuery() {
    return query;
  }

  public boolean getSuggestAccounts() {
    return suggestAccounts;
  }

  public int getLimit() {
    return limit;
  }

  public int getMaxAllowed() {
    return maxAllowed;
  }

  public int getMaxAllowedWithoutConfirmation() {
    return maxAllowedWithoutConfirmation;
  }

  public boolean isSkipServiceUsers() {
    return skipServiceUsers;
  }

  @Inject
  public SuggestReviewers(
      AccountVisibility av, @GerritServerConfig Config cfg, ReviewersUtil reviewersUtil) {
    this.reviewersUtil = reviewersUtil;
    this.maxSuggestedReviewers =
        cfg.getInt("suggest", "maxSuggestedReviewers", DEFAULT_MAX_SUGGESTED);
    this.limit = this.maxSuggestedReviewers;
    String suggest = cfg.getString("suggest", null, "accounts");
    this.suggestAccounts = !"OFF".equalsIgnoreCase(suggest) && !"false".equalsIgnoreCase(suggest);

    this.maxAllowed =
        cfg.getInt("addreviewer", "maxAllowed", ReviewerModifier.DEFAULT_MAX_REVIEWERS);
    this.maxAllowedWithoutConfirmation =
        cfg.getInt(
            "addreviewer",
            "maxWithoutConfirmation",
            ReviewerModifier.DEFAULT_MAX_REVIEWERS_WITHOUT_CHECK);

    logger.atFine().log("AccountVisibility: %s", av.name());

    this.skipServiceUsers =
        cfg.getBoolean("suggest", "skipServiceUsers", DEFAULT_SKIP_SERVICE_USERS);
  }

  public static GerritConfigListener configListener() {
    return acceptIfChanged(
        ConfigKey.create("suggest", "maxSuggestedReviewers"),
        ConfigKey.create("suggest", "accounts"),
        ConfigKey.create("addreviewer", "maxAllowed"),
        ConfigKey.create("addreviewer", "maxWithoutConfirmation"));
  }
}