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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.source.index;

import com.google.common.base.Joiner;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nullable;
import org.elasticsearch.action.update.UpdateRequest;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;

public class FileSourcesUpdaterHelper {

  private static final String SQL_ALL = "SELECT %s FROM file_sources WHERE data_type='%s' ";
  private static final String PROJECT_FILTER = " AND project_uuid=?";

  private static final String[] FIELDS = {
    "project_uuid",
    "file_uuid",
    "updated_at",
    "binary_data"
  };
  private static final String FIELDS_ONE_LINE = Joiner.on(",").join(FIELDS);

  private FileSourcesUpdaterHelper() {
    // only static stuff
  }

  public static PreparedStatement preparedStatementToSelectFileSources(DbClient dbClient, DbSession session, String dataType, @Nullable String projectUuid)
    throws SQLException {
    String sql = createSQL(dataType, projectUuid);
    // rows are big, so they are scrolled once at a time (one row in memory at a time)
    PreparedStatement stmt = dbClient.getMyBatis().newScrollingSingleRowSelectStatement(session, sql);
    if (projectUuid != null) {
      stmt.setString(1, projectUuid);
    }
    return stmt;
  }

  private static String createSQL(String dataType, @Nullable String projectUuid) {
    StringBuilder sql = new StringBuilder(String.format(SQL_ALL, FIELDS_ONE_LINE, dataType));
    if (projectUuid != null) {
      sql.append(PROJECT_FILTER);
    }
    return sql.toString();
  }

  public static class Row {
    private final String fileUuid;
    private final String projectUuid;
    private final long updatedAt;
    private final List updateRequests = new ArrayList<>();

    public Row(String projectUuid, String fileUuid, long updatedAt) {
      this.projectUuid = projectUuid;
      this.fileUuid = fileUuid;
      this.updatedAt = updatedAt;
    }

    public String getProjectUuid() {
      return projectUuid;
    }

    public String getFileUuid() {
      return fileUuid;
    }

    public long getUpdatedAt() {
      return updatedAt;
    }

    public List getUpdateRequests() {
      return updateRequests;
    }
  }
}