// Copyright (C) 2019 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.googlesource.gerrit.plugins.healthcheck.check;

import static com.googlesource.gerrit.plugins.healthcheck.check.HealthCheckNames.PROJECTSLIST;

import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.gerrit.extensions.common.ProjectInfo;
import com.google.gerrit.server.restapi.project.ListProjects;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.googlesource.gerrit.plugins.healthcheck.HealthCheckConfig;
import com.googlesource.gerrit.plugins.healthcheck.HealthCheckMetrics;
import java.util.SortedMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Singleton
public class ProjectsListHealthCheck extends AbstractHealthCheck {
  private static final Logger log = LoggerFactory.getLogger(ProjectsListHealthCheck.class);
  private static final int PROJECTS_LIST_LIMIT = 100;
  private final ListProjects listProjects;

  private HealthCheckMetrics.Factory healthCheckMetricsFactory;

  @Inject
  public ProjectsListHealthCheck(
      ListeningExecutorService executor,
      HealthCheckConfig config,
      ListProjects listProjects,
      HealthCheckMetrics.Factory healthCheckMetricsFactory) {
    super(executor, config, PROJECTSLIST, healthCheckMetricsFactory);

    this.listProjects = listProjects;
  }

  @Override
  protected Result doCheck() {
    listProjects.setStart(0);
    listProjects.setLimit(PROJECTS_LIST_LIMIT);
    listProjects.setShowDescription(true);
    listProjects.setMatchPrefix("All-");
    try {
      SortedMap<String, ProjectInfo> projects = listProjects.apply();
      if (projects != null && projects.size() > 0) {
        return Result.PASSED;
      }
      log.warn("Empty or null projects list: Gerrit should always have at least 1 project");
    } catch (Exception e) {
      log.warn("Unable to list projects", e);
    }
    return Result.FAILED;
  }
}