import 'package:intl/intl.dart';

/// Formatting utility helpers for currency, percentages, dates, and numbers.
class Formatters {
  static final NumberFormat _currencyFormat = NumberFormat.currency(symbol: '\$', decimalDigits: 2);
  static final NumberFormat _percentFormat = NumberFormat.decimalPercentPattern(decimalDigits: 2);

  /// Formats currency values (e.g., $1,234.56).
  static String formatCurrency(double? value, {String symbol = '\$'}) {
    if (value == null) return '-';
    if (symbol == '\$') return _currencyFormat.format(value);
    return NumberFormat.currency(symbol: symbol, decimalDigits: 2).format(value);
  }

  /// Formats percentage value with sign (e.g. +3.45%).
  static String formatPercent(double? value) {
    if (value == null) return '0.00%';
    final formatted = _percentFormat.format(value / 100);
    return value >= 0 ? '+$formatted' : formatted;
  }

  /// Formats compact numbers (e.g. 1.2M, 3.4B).
  static String formatCompactNumber(double? value) {
    if (value == null) return '-';
    return NumberFormat.compact().format(value);
  }

  /// Formats ISO date time string to readable short date.
  static String formatDate(String? isoDate) {
    if (isoDate == null || isoDate.isEmpty) return '-';
    try {
      final dt = DateTime.parse(isoDate).toLocal();
      return DateFormat('dd.MM.yyyy HH:mm').format(dt);
    } catch (_) {
      return isoDate;
    }
  }

  /// Formats date to day-month format.
  static String formatShortDate(DateTime dt) {
    return DateFormat('dd. MMM yyyy').format(dt);
  }
}