package de.aikiit.bilanzanalyser.reader;
   
   import de.aikiit.bilanzanalyser.entity.BilanzRow;
   import lombok.AccessLevel;
   import lombok.NoArgsConstructor;
   import lombok.extern.log4j.Log4j2;
   import org.odftoolkit.odfdom.doc.table.OdfTableRow;
   
   import java.math.BigDecimal;
  import java.text.DecimalFormat;
  import java.text.DecimalFormatSymbols;
  import java.time.LocalDate;
  import java.util.Locale;
  import java.util.Optional;
  
  @NoArgsConstructor(access = AccessLevel.PRIVATE)
  @Log4j2
  public final class BilanzRowParser {
  
      public static Optional<BilanzRow> fromOdfTableRow(final OdfTableRow row) {
          try {
              // in order to handle LibreOffice-specific currency values we need to parse properly and handle mixture of '.' and ',' in numbers.
              DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.GERMANY);
              DecimalFormat format = new DecimalFormat();
              format.setDecimalFormatSymbols(symbols);
              format.setParseBigDecimal(true);
  
              final String source = cleanUpAmount(row.getCellByIndex(1).getStringValue());
              final var amount = new BigDecimal(format.parse(source).toString());
              if (BigDecimal.ZERO.equals(amount) || source.isEmpty() || "0,00".equals(source)) {
                  log.debug("Amount is zero - skipping entry.");
                  return Optional.empty();
              }
  
              var bilanzRow = BilanzRow.builder() //
                      // remove trailing spaces and currency symbol
                      .amount(amount) //
                      .description(row.getCellByIndex(2).getStringValue()) //
                      .shop(row.getCellByIndex(3).getStringValue()) //
                      .payment(row.getCellByIndex(4).getStringValue()) //
                      .category(row.getCellByIndex(5).getStringValue());
  
              // map special values in date column to fallback date in entity
              var sourceDate = row.getCellByIndex(0).getStringValue().trim();
              if (!sourceDate.isBlank() && !"?".equals(sourceDate)) {
                  bilanzRow.date(LocalDate.parse(sourceDate));
              }
  
              return Optional.of(bilanzRow.build());
          } catch (Exception e) {
              log.error("Skipping row '{}' due to: {}", debugRowValues(row), e.getMessage());
              return Optional.empty();
          }
      }
  
      static String debugRowValues(final OdfTableRow row) {
          if (row == null) {
              return "null";
          }
          return "[" + row.getCellByIndex(0).getStringValue() + ", " + row.getCellByIndex(1).getStringValue() + ", " + row.getCellByIndex(2).getStringValue() + ", " + row.getCellByIndex(3).getStringValue() + ", " + row.getCellByIndex(4).getStringValue() + ", " + row.getCellByIndex(5).getStringValue() + "]";
      }
  
      /**
       * Removes currency symbol and trims the given amount value from an ODS file.
       *
       * @param amount given amount, e.g. 1,23 €
       * @return trimmed amount in order to be parseable as a numeric.
       */
      static String cleanUpAmount(final String amount) {
          if (amount != null && !amount.isEmpty()) {
              return amount.replace("€", "").trim();
          }
          return amount;
      }
  }