import 'package:abawo_bt_app/model/gear_configurator.dart';
import 'package:abawo_bt_app/model/gear_ratio_codec.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  group('gear ratio codec', () {
    test('maps one byte across the configured drivetrain range', () {
      expect(decodeGearRatioByte(1), gearRatioMin);
      expect(decodeGearRatioByte(255), gearRatioMax);
      expect(encodeGearRatioByte(0), 0);
      expect(encodeGearRatioByte(gearRatioMax + 1), 255);
    });

    test('quantizes ratios through the byte encoding', () {
      final quantized = quantizeGearRatio(50 / 11);

      expect(quantized, closeTo(4.55, 0.02));
      expect(encodeGearRatioByte(quantized), encodeGearRatioByte(50 / 11));
    });
  });

  group('calculateGearRatios', () {
    test('keep all deduplicates and sorts ascending', () {
      final result = calculateGearRatios(
        chainrings: [40, 20],
        sprockets: [20, 10],
        mode: GearRetentionMode.keepAll,
      );

      expect(result.ratios, orderedEquals(result.ratios.toList()..sort()));
      expect(result.ratios.length, 3);
      expect(result.duplicateCount, 1);
    });

    test('keep highest drops lower overlapping larger-chainring ratios', () {
      final result = calculateGearRatios(
        chainrings: [30, 50],
        sprockets: [10, 20, 30],
        mode: GearRetentionMode.keepHighest,
      );

      expect(result.ratios.first, closeTo(1, 0.02));
      expect(result.ratios.last, closeTo(5, 0.02));
      expect(result.ratios.length, 4);
      expect(result.ratios.where((ratio) => ratio < 1).length, 0);
    });

    test('discard ratios outside the one-byte range', () {
      final result = calculateGearRatios(
        chainrings: [20, 60],
        sprockets: [5, 100],
        mode: GearRetentionMode.keepAll,
      );

      expect(result.discardedBelowRange, 1);
      expect(result.discardedAboveRange, 1);
      expect(result.ratios.length, 2);
    });

    test('truncates to the configured maximum', () {
      final result = calculateGearRatios(
        chainrings: [30, 40, 50],
        sprockets: [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21],
        mode: GearRetentionMode.keepAll,
        maxRatios: 8,
      );

      expect(result.ratios.length, 8);
      expect(result.truncatedCount, greaterThan(0));
    });
  });
}