formatAmount method

String formatAmount({ bool withSymbol = true, })

Implementation

String formatAmount({bool withSymbol = true}) {
  final decimals = display.decimals;
  final symbol = withSymbol ? display.assetSymbol : '';
  try {
    final raw = BigInt.parse(value);
    final divisor = BigInt.from(10).pow(decimals);

    final BigInt intPart = raw ~/ divisor;
    BigInt rem = raw % divisor;

    const int scale = 4; // 4 decimal places
    final BigInt factorWithExtra = BigInt.from(
      10,
    ).pow(scale + 1); // extra digit for HALF_UP
    BigInt fracWithExtra = (rem * factorWithExtra) ~/ divisor;

    final BigInt last = fracWithExtra % BigInt.from(10);
    BigInt frac = fracWithExtra ~/ BigInt.from(10);

    if (last >= BigInt.from(5)) frac += BigInt.one; // HALF_UP

    final BigInt maxFrac = BigInt.from(10).pow(scale);
    BigInt finalInt = intPart;
    if (frac >= maxFrac) {
      finalInt += BigInt.one;
      frac = BigInt.zero;
    }

    final String intStr = _withCommas(finalInt.toString());
    String fracStr = frac
        .toString()
        .padLeft(scale, '0')
        .replaceFirst(RegExp(r'0+$'), '');

    return (fracStr.isEmpty ? '$intStr $symbol' : '$intStr.$fracStr $symbol')
        .trim();
  } catch (_) {
    return '$value $symbol'.trim();
  }
}