import 'package:flutter_test/flutter_test.dart';
import 'package:rippr/src/domain/models.dart';
import 'package:rippr/src/export/ride_export.dart';
import 'package:rippr/src/ui/format.dart';

/// V3-03: distance and speed units. Metric is the default everywhere, so every existing
/// call site that omits `unit:` keeps behaving exactly as before — these tests are about
/// what changes when a caller opts into imperial.
void main() {
  group('formatDistance', () {
    test('metric switches from metres to kilometres at 1000 m', () {
      expect(formatDistance(999), '999 m');
      expect(formatDistance(1000), '1.0 km');
      expect(formatDistance(12345.6), '12.3 km');
    });

    test('imperial switches from feet to miles at 1000 ft', () {
      // 1000 ft is ~304.8 m.
      expect(formatDistance(100, unit: UnitSystem.imperial), '328 ft');
      expect(
        formatDistance(305, unit: UnitSystem.imperial),
        '0.2 mi',
        reason: 'just past the 1000 ft threshold (1000 ft is not 1 mile — 5280 ft is)',
      );
      // 12345.6 m is ~7.67 mi.
      expect(formatDistance(12345.6, unit: UnitSystem.imperial), '7.7 mi');
    });

    test('metric is the default when unit is omitted', () {
      expect(formatDistance(1500), formatDistance(1500, unit: UnitSystem.metric));
    });
  });

  group('formatSpeed', () {
    test('metric prints km/h to one decimal', () {
      expect(formatSpeed(88.5), '88.5 km/h');
    });

    test('imperial converts to mph', () {
      // 100 km/h is ~62.1 mph.
      expect(formatSpeed(100, unit: UnitSystem.imperial), '62.1 mph');
    });
  });

  group('formatElevation', () {
    test('metric prints whole metres', () {
      expect(formatElevation(1045.7), '1045 m');
    });

    test('imperial converts to whole feet', () {
      // 1000 m is ~3280.84 ft.
      expect(formatElevation(1000, unit: UnitSystem.imperial), '3280 ft');
    });
  });

  group('parts helpers used by BigStat', () {
    test('formatDistanceParts always uses the "big" unit, km or mi', () {
      expect(formatDistanceParts(500), ('0.5', 'km'));
      expect(formatDistanceParts(1609.344, unit: UnitSystem.imperial), ('1.0', 'mi'));
    });

    test('formatSpeedParts has zero decimal places, matching the live speedo', () {
      expect(formatSpeedParts(88.6), ('89', 'km/h'));
      expect(formatSpeedParts(100, unit: UnitSystem.imperial), ('62', 'mph'));
    });
  });

  group('formatSpeedRangeLabel', () {
    test('metric passes the km/h boundaries through unchanged', () {
      expect(formatSpeedRangeLabel(10, 20), '10–20');
    });

    test('imperial converts and rounds the boundaries, not the underlying bucket', () {
      // 10 km/h ~ 6 mph, 20 km/h ~ 12 mph.
      expect(formatSpeedRangeLabel(10, 20, unit: UnitSystem.imperial), '6–12');
    });
  });

  group('unit system never reaches export (the risk this ticket names)', () {
    // gpx() and geoJson() take no UnitSystem parameter at all -- there is no argument to
    // thread incorrectly. This proves the invariant one level up: formatting the same
    // stored value under both units produces different text, but export always reads the
    // one stored value, regardless of what a caller displays it as.
    const trip = Trip(
      id: 1,
      startedAt: 1700000000000,
      endedAt: 1700000600000,
      state: TripState.completed,
      distanceM: 12345.6,
      maxSpeedKmh: 88.5,
    );

    test('display formatting differs by unit for the same stored value', () {
      expect(
        formatDistance(trip.distanceM, unit: UnitSystem.metric),
        isNot(formatDistance(trip.distanceM, unit: UnitSystem.imperial)),
      );
    });

    test('export output is identical regardless of what unit the UI last showed', () {
      // GPX carries no trip-level distance field at all (it is built from individual
      // <trkpt> elements) -- deterministic regardless of unit is the property under
      // test, not any particular substring.
      final first = gpx(trip, const [], const [], 'Ride');
      final second = gpx(trip, const [], const [], 'Ride');
      expect(first, second);

      // GeoJSON does carry trip.distanceM in its properties, and it is the raw metric
      // figure -- 12345.6, never a converted "7.7 mi".
      final json = geoJson(trip, const [], const [], 'Ride');
      expect(json, contains('"distance_m": 12345.6'));
      expect(json, isNot(contains('mi')), reason: 'export is metric by specification');
    });
  });
}