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/*
 * This file is part of onkostar-plugin-dnpm
 *
 * Copyright (C) 2023-2026 the original author or authors.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

package dev.dnpm.oshelper.atc.services;

import dev.dnpm.oshelper.atc.AgentCode;
import dev.dnpm.oshelper.atc.AtcCode;
import dev.dnpm.oshelper.exceptions.FileParsingException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;
import org.apache.commons.csv.CSVFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Service to query for agent codes based on ATC codes file
 *
 * @author Paul-Christian Volkmer
 * @since 2.0.0
 */
public class CsvAgentCodeService implements AgentCodeService {

  protected final Logger logger = LoggerFactory.getLogger(this.getClass());
  protected final List<AgentCode> codeList = new ArrayList<>();

  private static final String ATC_CODE_COLUMN = "ATC-Code";
  private static final String ATC_NAME_COLUMN = "ATC-Bedeutung";
  private static final String ATC_VERSION_COLUMN = "Version";

  public CsvAgentCodeService() {
    this.codeList.addAll(parseFile());
  }

  /**
   * Queries source for agents code starting with or name containing query string. If size is zero,
   * all available results will be returned.
   *
   * @param query The query string
   * @param size Maximal amount of responses
   * @return A list with agent codes
   */
  @Override
  public List<AgentCode> findAgentCodes(final String query, final int size) {
    var resultStream =
        this.codeList.stream()
            .filter(
                agentCode ->
                    agentCode.getCode().toLowerCase().startsWith(query.toLowerCase())
                        || agentCode.getName().toLowerCase().contains(query.toLowerCase()));

    if (size > 0) {
      return resultStream.limit(size).collect(Collectors.toList());
    }
    return resultStream.collect(Collectors.toList());
  }

  /**
   * Queries source for agents with code matching code string.
   *
   * @param code The code string
   * @return An optional agent code if found
   */
  @Override
  public Optional<AgentCode> getAgentCode(final String code) {
    return this.codeList.stream().filter(agentCode -> agentCode.getCode().equals(code)).findFirst();
  }

  protected List<AgentCode> parseFile() {
    var result = new ArrayList<AgentCode>();

    try {
      var inputStream =
          Objects.requireNonNull(this.getClass().getClassLoader().getResourceAsStream("atc.csv"));
      var parser =
          CSVFormat.RFC4180
              .withHeader()
              .withDelimiter('\t')
              .withIgnoreEmptyLines()
              .withSkipHeaderRecord()
              .parse(new InputStreamReader(inputStream));
      for (var row : parser) {
        if (!row.isMapped(ATC_CODE_COLUMN) || !row.isMapped(ATC_NAME_COLUMN)) {
          throw new FileParsingException("No CSV column for ATC code or name found");
        }
        final var atcCode = row.get(ATC_CODE_COLUMN).trim();
        if (!AtcCode.isAtcCode(atcCode)) {
          logger.warn("Unusable ATC code '{}' - ignored", atcCode);
          continue;
        }
        if (row.isMapped(ATC_VERSION_COLUMN)) {
          result.add(new AtcCode(atcCode, row.get(ATC_NAME_COLUMN), row.get(ATC_VERSION_COLUMN)));
        } else {
          result.add(new AtcCode(atcCode, row.get(ATC_NAME_COLUMN)));
        }
      }
      return result;
    } catch (IOException | FileParsingException e) {
      logger.warn("Error reading information from ATC codes");
    }
    logger.info("Found {} ATC codes", result.size());
    return result;
  }
}