import 'package:decimal/decimal.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

/// Currency symbols for the instruments we expect to see. Falls back to the
/// ISO code itself (e.g. 'USDT') when we don't have a nicer glyph.
const _currencySymbols = {'RUB': '₽', 'USD': '\$', 'EUR': '€'};

/// Formats a decimal-string amount (as the API sends it, to avoid double
/// rounding errors) with `intl`'s ru_RU rules and a currency symbol.
class MoneyText extends StatelessWidget {
  const MoneyText(this.amount, {required this.currency, super.key, this.style});

  /// The amount as a string, e.g. `'1234.5'` — never a [double].
  final String amount;
  final String currency;
  final TextStyle? style;

  static String format(String amount, String currency) {
    final value = Decimal.parse(amount).toDouble();
    final symbol = _currencySymbols[currency] ?? currency;
    final formatter = NumberFormat.currency(
      locale: 'ru_RU',
      symbol: symbol,
      decimalDigits: 2,
    );
    return formatter.format(value);
  }

  @override
  Widget build(BuildContext context) {
    return Text(format(amount, currency), style: style);
  }
}