import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_app/halkyon_app.dart';

// A limit as the operator types it into the grant's sheet (Halkyon Learn's
// ADR 0021, D38): money in millionths, tokens whole.

void main() {
  const money = AssistantLimitUnit.money;
  const tokens = AssistantLimitUnit.tokens;

  test('reads money as millionths, with a point or a comma', () {
    expect(limitFromText('5', money), 5000000);
    expect(limitFromText('2.50', money), 2500000);
    expect(limitFromText('2,5', money), 2500000);
    expect(limitFromText('0.000001', money), 1);
    expect(limitFromText(' 1 000.25 ', money), 1000250000);
  });

  test('reads tokens whole, grouped by thousands or not', () {
    expect(limitFromText('1000000', tokens), 1000000);
    expect(limitFromText('1,000,000', tokens), 1000000);
    expect(limitFromText('1.000.000', tokens), 1000000);
    expect(limitFromText('1_000_000', tokens), 1000000);
    expect(limitFromText('250', tokens), 250);
  });

  test('reads nothing typed as no limit', () {
    expect(limitFromText('', money), isNull);
    expect(limitFromText('  ', tokens), isNull);
  });

  test("refuses what isn't an amount", () {
    for (final (text, unit) in [
      ('-1', money),
      ('1.5.0', money),
      ('0.0000001', money),
      ('five', money),
      ('1e6', money),
      ('1234567890123', money),
      ('1.5', tokens),
      ('1,00', tokens),
      ('1,000.000', tokens),
      ('-5', tokens),
      ('1234567890123', tokens),
    ]) {
      expect(
        () => limitFromText(text, unit),
        throwsFormatException,
        reason: '$text in ${unit.name}',
      );
    }
  });

  test('writes a limit as it is read back', () {
    expect(limitText(null, money), '');
    expect(limitText(5000000, money), '5');
    expect(limitText(2500000, money), '2.5');
    expect(limitText(1, money), '0.000001');
    expect(limitText(1000000, tokens), '1000000');
    for (final micros in [0, 1, 990000, 12345678]) {
      expect(limitFromText(limitText(micros, money), money), micros);
    }
  });
}