/*
 * 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 static org.apache.commons.collections4.CollectionUtils.isEmpty;

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.tuple.Pair;
import org.hisp.dhis.dxf2.common.ImportOptions;
import org.hisp.dhis.dxf2.deprecated.tracker.event.Event;
import org.hisp.dhis.security.acl.AclService;
import org.hisp.dhis.trackedentity.TrackedEntity;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.stereotype.Component;

/**
 * @author Luciano Fiandesio
 */
@Component("workContextTrackedEntityInstancesSupplier")
public class TrackedEntityInstanceSupplier
    extends AbstractSupplier<Map<String, Pair<TrackedEntity, Boolean>>> {
  private final AclService aclService;

  public TrackedEntityInstanceSupplier(
      NamedParameterJdbcTemplate jdbcTemplate, AclService aclService) {
    super(jdbcTemplate);
    this.aclService = aclService;
  }

  @Override
  public Map<String, Pair<TrackedEntity, Boolean>> get(
      ImportOptions importOptions, List<Event> events) {

    if (events == null) {
      return new HashMap<>();
    }
    // Collect all the org unit uids to pass as SQL query argument
    Set<String> teiUids =
        events.stream()
            .filter(e -> e.getTrackedEntityInstance() != null)
            .map(Event::getTrackedEntityInstance)
            .collect(Collectors.toSet());

    if (isEmpty(teiUids)) {
      return new HashMap<>();
    }

    // Create a map: tei uid -> List [event uid]
    Multimap<String, String> teiToEvent = HashMultimap.create();
    for (Event event : events) {
      teiToEvent.put(event.getTrackedEntityInstance(), event.getUid());
    }

    //
    // Get all TEI associated to the events
    //
    Map<String, TrackedEntity> teiMap = getTrackedEntityInstances(teiUids, teiToEvent);

    Map<String, Pair<TrackedEntity, Boolean>> result = new HashMap<>();

    //
    // Return a map containing a Pair where key is the Tei and value is the
    // boolean, can the TEI be updated
    // by current user
    //
    for (String event : teiMap.keySet()) {
      TrackedEntity tei = teiMap.get(event);
      result.put(
          event,
          Pair.of(
              tei,
              !importOptions.isSkipLastUpdated()
                  ? aclService.canUpdate(importOptions.getUser(), tei)
                  : null));
    }

    return result;
  }

  private Map<String, TrackedEntity> getTrackedEntityInstances(
      Set<String> teiUids, Multimap<String, String> teiToEvent) {
    final String sql =
        "select tei.trackedentityid, tei.uid, tei.code "
            + "from trackedentity tei where tei.uid in (:ids)";

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

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

          while (rs.next()) {
            TrackedEntity tei = new TrackedEntity();
            tei.setId(rs.getLong("trackedentityid"));
            tei.setUid(rs.getString("uid"));
            tei.setCode(rs.getString("code"));
            for (String event : teiToEvent.get(tei.getUid())) {
              results.put(event, tei);
            }
          }
          return results;
        });
  }
}
