/// Price formatting and parsing for receipt amounts.
library;

/// Matches a price that is the entire line, e.g. `2,09` or `-2.00`.
final priceOnlyPattern = RegExp(r'^-?\d+[.,]\d{2}$');

/// Name (optional) plus a price at the end of the line.
final trailingPricePattern = RegExp(r'^(.*?)\s+(-?\d+[.,]\d{2})$');

/// `2 x 1.50` or `2 X 1,50 3,00` (quantity, unit price, optional line total).
final quantityPattern = RegExp(
  r'^(\d+)\s*[xX×]\s*(-?\d+[.,]\d{2})(?:\s+(-?\d+[.,]\d{2}))?$',
);

bool isPriceOnly(String line) => priceOnlyPattern.hasMatch(line);

double? tryParsePrice(String raw) {
  final cleaned = raw
      .trim()
      .replaceAll('€', '')
      .replaceAll(RegExp(r'\s'), '')
      .replaceAll(',', '.');
  return double.tryParse(cleaned);
}

String formatEuro(double value) => '€ ${value.toStringAsFixed(2)}';

double roundMoney(double value) => (value * 100).round() / 100;