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/*
 * SonarQube
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.plugins.ws;

import com.google.common.collect.ImmutableMap;
import java.util.Collection;
import java.util.Map;
import org.sonar.api.server.ws.Request;
import org.sonar.api.server.ws.Response;
import org.sonar.api.server.ws.WebService;
import org.sonar.api.utils.text.JsonWriter;
import org.sonar.core.platform.PluginInfo;
import org.sonar.server.plugins.PluginDownloader;
import org.sonar.server.plugins.ServerPluginRepository;
import org.sonar.server.plugins.UpdateCenterMatrixFactory;
import org.sonar.updatecenter.common.Plugin;

import static com.google.common.io.Resources.getResource;
import static org.sonar.server.plugins.ws.PluginWSCommons.compatiblePluginsByKey;

/**
 * Implementation of the {@code pending} action for the Plugins WebService.
 */
public class PendingAction implements PluginsWsAction {

  private static final String ARRAY_INSTALLING = "installing";
  private static final String ARRAY_REMOVING = "removing";

  private final PluginDownloader pluginDownloader;
  private final ServerPluginRepository installer;
  private final PluginWSCommons pluginWSCommons;
  private final UpdateCenterMatrixFactory updateCenterMatrixFactory;

  public PendingAction(PluginDownloader pluginDownloader,
    ServerPluginRepository installer,
    PluginWSCommons pluginWSCommons, UpdateCenterMatrixFactory updateCenterMatrixFactory) {
    this.pluginDownloader = pluginDownloader;
    this.installer = installer;
    this.pluginWSCommons = pluginWSCommons;
    this.updateCenterMatrixFactory = updateCenterMatrixFactory;
  }

  @Override
  public void define(WebService.NewController controller) {
    controller.createAction("pending")
      .setDescription("Get the list of plugins which will either be installed or removed at the next startup of the SonarQube instance, sorted by plugin name")
      .setSince("5.2")
      .setHandler(this)
      .setResponseExample(getResource(this.getClass(), "example-pending_plugins.json"));
  }

  @Override
  public void handle(Request request, Response response) throws Exception {
    ImmutableMap compatiblePluginsByKey = compatiblePluginsByKey(updateCenterMatrixFactory);

    JsonWriter jsonWriter = response.newJsonWriter();

    jsonWriter.beginObject();
    writeInstalling(jsonWriter, compatiblePluginsByKey);
    writeRemoving(jsonWriter, compatiblePluginsByKey);
    jsonWriter.endObject();
    jsonWriter.close();
  }

  private void writeInstalling(JsonWriter json, Map compatiblePluginsByKey) {
    Collection plugins = pluginDownloader.getDownloadedPlugins();
    pluginWSCommons.writePluginInfoList(json, plugins, compatiblePluginsByKey, ARRAY_INSTALLING);
  }

  private void writeRemoving(JsonWriter json, Map compatiblePluginsByKey) {
    Collection plugins = installer.getUninstalledPlugins();
    pluginWSCommons.writePluginInfoList(json, plugins, compatiblePluginsByKey, ARRAY_REMOVING);
  }
}