/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.dxf2.deprecated.tracker.importer.context;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import java.sql.ResultSet;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.commons.lang3.StringUtils;
import org.hisp.dhis.dxf2.common.ImportOptions;
import org.hisp.dhis.dxf2.deprecated.tracker.event.Event;
import org.hisp.dhis.user.User;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Component;

/**
 * @author Luciano Fiandesio
 */
@Component("workContextAssignedUsersSupplier")
public class AssignedUserSupplier extends AbstractSupplier<Map<String, User>> {
  public AssignedUserSupplier(NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
    super(namedParameterJdbcTemplate);
  }

  @Override
  public Map<String, User> get(ImportOptions importOptions, List<Event> events) {
    // Collect all the "assigned user" uids to pass as SQL query argument
    Set<String> userUids =
        events.stream()
            .filter(e -> StringUtils.isNotEmpty(e.getAssignedUser()))
            .map(Event::getAssignedUser)
            .collect(Collectors.toSet());

    // Create a map user -> event
    Multimap<String, String> userToEvent = HashMultimap.create();
    for (Event event : events) {
      userToEvent.put(event.getAssignedUser(), event.getUid());
    }

    if (!userUids.isEmpty()) {
      final String sql = "select userinfoid, uid, code from userinfo " + "where uid in (:ids)";

      MapSqlParameterSource parameters = new MapSqlParameterSource();
      parameters.addValue("ids", userUids);

      return jdbcTemplate.query(
          sql,
          parameters,
          (ResultSet rs) -> {
            Map<String, User> results = new HashMap<>();

            while (rs.next()) {
              User user = new User();
              user.setId(rs.getLong("userinfoid"));
              user.setUid(rs.getString("uid"));
              user.setCode(rs.getString("code"));

              for (String event : userToEvent.get(user.getUid())) {
                results.put(event, user);
              }
            }
            return results;
          });
    }
    return new HashMap<>();
  }
}
