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/*
 * SonarQube
 * Copyright (C) 2009-2018 SonarSource SA
 * mailto:info 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.duplication.ws;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;
import org.sonar.db.component.ComponentDao;
import org.sonar.db.component.ComponentDto;
import org.sonarqube.ws.Duplications;
import org.sonarqube.ws.Duplications.Block;
import org.sonarqube.ws.Duplications.ShowResponse;

import static com.google.common.collect.Maps.newHashMap;
import static org.sonar.core.util.Protobuf.setNullable;

// TODO Add UT on branch
public class ShowResponseBuilder {

  private final ComponentDao componentDao;

  public ShowResponseBuilder(DbClient dbClient) {
    this.componentDao = dbClient.componentDao();
  }

  @VisibleForTesting
  ShowResponseBuilder(ComponentDao componentDao) {
    this.componentDao = componentDao;
  }

  ShowResponse build(DbSession session, List blocks, @Nullable String branch) {
    ShowResponse.Builder response = ShowResponse.newBuilder();
    Map refByComponentKey = newHashMap();
    blocks.stream()
      .map(block -> toWsDuplication(block, refByComponentKey))
      .forEach(response::addDuplications);

    writeFiles(session, response, refByComponentKey, branch);

    return response.build();
  }

  private static Duplications.Duplication.Builder toWsDuplication(DuplicationsParser.Block block, Map refByComponentKey) {
    Duplications.Duplication.Builder wsDuplication = Duplications.Duplication.newBuilder();
    block.getDuplications().stream()
      .map(d -> toWsBlock(refByComponentKey, d))
      .forEach(wsDuplication::addBlocks);

    return wsDuplication;
  }

  private static Block.Builder toWsBlock(Map refByComponentKey, DuplicationsParser.Duplication duplication) {
    String ref = null;
    ComponentDto componentDto = duplication.file();
    if (componentDto != null) {
      String componentKey = componentDto.getDbKey();
      ref = refByComponentKey.computeIfAbsent(componentKey, k -> Integer.toString(refByComponentKey.size() + 1));
    }

    Block.Builder block = Block.newBuilder();
    block.setFrom(duplication.from());
    block.setSize(duplication.size());
    setNullable(ref, block::setRef);

    return block;
  }

  private static Duplications.File toWsFile(ComponentDto file, @Nullable ComponentDto project, @Nullable ComponentDto subProject, @Nullable String branch) {
    Duplications.File.Builder wsFile = Duplications.File.newBuilder();
    wsFile.setKey(file.getKey());
    wsFile.setUuid(file.uuid());
    wsFile.setName(file.longName());
    setNullable(project, p -> {
      wsFile.setProject(p.getKey());
      wsFile.setProjectUuid(p.uuid());
      wsFile.setProjectName(p.longName());
      // Do not return sub project if sub project and project are the same
      boolean displaySubProject = subProject != null && !subProject.uuid().equals(project.uuid());
      if (displaySubProject) {
        wsFile.setSubProject(subProject.getKey());
        wsFile.setSubProjectUuid(subProject.uuid());
        wsFile.setSubProjectName(subProject.longName());
      }
      if (branch != null) {
        wsFile.setBranch(branch);
      }
      return wsFile;
    });
    return wsFile.build();
  }

  private void writeFiles(DbSession session, ShowResponse.Builder response, Map refByComponentKey, @Nullable String branch) {
    Map projectsByUuid = newHashMap();
    Map parentModulesByUuid = newHashMap();
    Map filesByRef = response.getMutableFiles();

    for (Map.Entry entry : refByComponentKey.entrySet()) {
      String componentKey = entry.getKey();
      String ref = entry.getValue();
      Optional fileOptional = componentDao.selectByKey(session, componentKey);
      if (fileOptional.isPresent()) {
        ComponentDto file = fileOptional.get();

        ComponentDto project = getProject(file.projectUuid(), projectsByUuid, session);
        ComponentDto parentModule = getParentProject(file.getRootUuid(), parentModulesByUuid, session);
        filesByRef.put(ref, toWsFile(file, project, parentModule, branch));
      }
    }
  }

  private ComponentDto getProject(String projectUuid, Map projectsByUuid, DbSession session) {
    ComponentDto project = projectsByUuid.get(projectUuid);
    if (project == null) {
      Optional projectOptional = componentDao.selectByUuid(session, projectUuid);
      if (projectOptional.isPresent()) {
        project = projectOptional.get();
        projectsByUuid.put(project.uuid(), project);
      }
    }
    return project;
  }

  private ComponentDto getParentProject(String rootUuid, Map subProjectsByUuid, DbSession session) {
    ComponentDto project = subProjectsByUuid.get(rootUuid);
    if (project == null) {
      Optional projectOptional = componentDao.selectByUuid(session, rootUuid);
      if (projectOptional.isPresent()) {
        project = projectOptional.get();
        subProjectsByUuid.put(project.uuid(), project);
      }
    }
    return project;
  }

}