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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.rule.ws;

import com.google.common.base.Optional;
import com.google.common.io.Resources;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.sonar.api.rule.RuleKey;
import org.sonar.api.server.ws.Request;
import org.sonar.api.server.ws.Response;
import org.sonar.api.server.ws.WebService;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;
import org.sonar.db.rule.RuleDto;
import org.sonar.db.rule.RuleParamDto;
import org.sonarqube.ws.Rules.ShowResponse;

import static java.util.Collections.singletonList;
import static org.sonar.server.ws.WsUtils.checkFoundWithOptional;
import static org.sonar.server.ws.WsUtils.writeProtobuf;

/**
 * @since 4.4
 */
public class ShowAction implements RulesWsAction {

  public static final String PARAM_KEY = "key";
  public static final String PARAM_ACTIVES = "actives";

  private final DbClient dbClient;
  private final RuleMapper mapper;
  private final ActiveRuleCompleter activeRuleCompleter;

  public ShowAction(DbClient dbClient, RuleMapper mapper, ActiveRuleCompleter activeRuleCompleter) {
    this.dbClient = dbClient;
    this.activeRuleCompleter = activeRuleCompleter;
    this.mapper = mapper;
  }

  @Override
  public void define(WebService.NewController controller) {
    WebService.NewAction action = controller
      .createAction("show")
      .setDescription("Get detailed information about a rule
" +
        "Since 5.5, following fields in the response have been deprecated :" +
        "" +
        "\"effortToFixDescription\" becomes \"gapDescription\"" +
        "\"debtRemFnCoeff\" becomes \"remFnGapMultiplier\"" +
        "\"defaultDebtRemFnCoeff\" becomes \"defaultRemFnGapMultiplier\"" +
        "\"debtRemFnOffset\" becomes \"remFnBaseEffort\"" +
        "\"defaultDebtRemFnOffset\" becomes \"defaultRemFnBaseEffort\"" +
        "\"debtOverloaded\" becomes \"remFnOverloaded\"" +
        "")
      .setSince("4.2")
      .setResponseExample(Resources.getResource(getClass(), "example-show.json"))
      .setHandler(this);

    action
      .createParam(PARAM_KEY)
      .setDescription("Rule key")
      .setRequired(true)
      .setExampleValue("javascript:EmptyBlock");

    action
      .createParam(PARAM_ACTIVES)
      .setDescription("Show rule's activations for all profiles (\"active rules\")")
      .setBooleanPossibleValues()
      .setDefaultValue(false);
  }

  @Override
  public void handle(Request request, Response response) throws Exception {
    RuleKey key = RuleKey.parse(request.mandatoryParam(PARAM_KEY));
    DbSession dbSession = dbClient.openSession(false);
    try {
      Optional optionalRule = dbClient.ruleDao().selectByKey(dbSession, key);
      checkFoundWithOptional(optionalRule, "Rule not found: " + key);
      RuleDto rule = optionalRule.get();
      List templateRules = new ArrayList<>();
      if (rule.getTemplateId() != null) {
        Optional templateRule = dbClient.ruleDao().selectById(rule.getTemplateId(), dbSession);
        if (templateRule.isPresent()) {
          templateRules.add(templateRule.get());
        }
      }
      List ruleParameters = dbClient.ruleDao().selectRuleParamsByRuleIds(dbSession, singletonList(rule.getId()));
      ShowResponse showResponse = buildResponse(dbSession, request,
        new SearchAction.SearchResult()
          .setRules(singletonList(rule))
          .setTemplateRules(templateRules)
          .setRuleParameters(ruleParameters)
          .setTotal(1L));
      writeProtobuf(showResponse, request, response);
    } finally {
      dbClient.closeSession(dbSession);
    }
  }

  private ShowResponse buildResponse(DbSession dbSession, Request request, SearchAction.SearchResult searchResult) {
    ShowResponse.Builder responseBuilder = ShowResponse.newBuilder();
    RuleDto rule = searchResult.getRules().get(0);
    responseBuilder.setRule(mapper.toWsRule(rule, searchResult, Collections.emptySet()));

    if (request.mandatoryParamAsBoolean(PARAM_ACTIVES)) {
      activeRuleCompleter.completeShow(dbSession, rule, responseBuilder);
    }

    return responseBuilder.build();
  }
}