import 'package:flutter_test/flutter_test.dart';
import 'package:rippr/src/config/config.dart';
import 'package:rippr/src/domain/models.dart';
import 'package:rippr/src/hud/hud_metric.dart';
import 'package:rippr/src/hud/hud_widget_layout.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// `Config` had no dedicated tests before V3-03 — every existing widget test leaves
/// `configProvider` null, so this is its first direct coverage.
void main() {
  Future<Config> freshConfig([Map<String, Object> initial = const {}]) async {
    SharedPreferences.setMockInitialValues(initial);
    return Config.load();
  }

  group('unitSystem', () {
    test('an explicit choice always wins over the locale default', () async {
      final config = await freshConfig();
      await config.setUnitSystem(UnitSystem.imperial);
      expect(config.unitSystem, UnitSystem.imperial);

      await config.setUnitSystem(UnitSystem.metric);
      expect(config.unitSystem, UnitSystem.metric);
    });

    test('with nothing stored, falls back to a locale default without throwing', () async {
      // The exact value is environment-dependent (it reads the real platform locale),
      // so this asserts the fallback path is safe to reach, not a specific answer.
      final config = await freshConfig();
      expect(config.unitSystem, isA<UnitSystem>());
    });
  });

  group('mapEnabled', () {
    test('defaults to true', () async {
      final config = await freshConfig();
      expect(config.mapEnabled, isTrue);
    });

    test('round-trips through set/get', () async {
      final config = await freshConfig();
      await config.setMapEnabled(false);
      expect(config.mapEnabled, isFalse);
    });
  });

  group('mountedMode', () {
    test('defaults to false', () async {
      final config = await freshConfig();
      expect(config.mountedMode, isFalse);
    });

    test('round-trips through set/get', () async {
      final config = await freshConfig();
      await config.setMountedMode(true);
      expect(config.mountedMode, isTrue);
    });
  });

  group('crashReportingEnabled', () {
    test('defaults to false', () async {
      final config = await freshConfig();
      expect(config.crashReportingEnabled, isFalse);
    });

    test('round-trips through set/get', () async {
      final config = await freshConfig();
      await config.setCrashReportingEnabled(true);
      expect(config.crashReportingEnabled, isTrue);
    });
  });

  group('uploadEndpoint', () {
    test('defaults to empty, not null or a placeholder', () async {
      final config = await freshConfig();
      expect(config.uploadEndpoint, '');
    });

    test('trims whitespace on write', () async {
      final config = await freshConfig();
      await config.setUploadEndpoint('  https://example.test/ingest  ');
      expect(config.uploadEndpoint, 'https://example.test/ingest');
    });
  });

  group('hudLayout (UI-04)', () {
    test('a fresh install gets a default layout for every metric', () async {
      final config = await freshConfig();
      final layout = config.hudLayout;
      expect(layout.keys.toSet(), HudMetric.values.toSet());
    });

    test('round-trips an edited layout through set/get', () async {
      final config = await freshConfig();
      final edited = {
        ...config.hudLayout,
        HudMetric.speed: const HudWidgetLayout(
          metric: HudMetric.speed,
          col: 2,
          row: 3,
          colSpan: 2,
          rowSpan: 1,
          visible: true,
        ),
      };

      await config.setHudLayout(edited);
      final reloaded = config.hudLayout;

      expect(reloaded[HudMetric.speed]!.col, 2);
      expect(reloaded[HudMetric.speed]!.row, 3);
    });

    test('a metric missing from a saved layout (e.g. one added in a later app '
        'version) falls back to its default rather than being omitted', () async {
      SharedPreferences.setMockInitialValues({
        'hud_layout': '{"speed": {"col": 1, "row": 1, "colSpan": 1, "rowSpan": 2, '
            '"visible": true}}',
      });
      final config = await Config.load();
      final layout = config.hudLayout;

      expect(layout.keys.toSet(), HudMetric.values.toSet());
      final expectedDefault = HudWidgetLayout.defaultFor(HudMetric.distance);
      expect(layout[HudMetric.distance]!.col, expectedDefault.col);
      expect(layout[HudMetric.distance]!.visible, expectedDefault.visible);
    });

    test('an old-shaped (pre-grid) saved layout falls back to defaults rather than '
        'crashing', () async {
      SharedPreferences.setMockInitialValues({
        'hud_layout': '{"speed": {"x": 0.1, "y": 0.1, "width": 0.2, "height": 0.1, '
            '"visible": true}}',
      });
      final config = await Config.load();
      final layout = config.hudLayout;

      expect(layout.keys.toSet(), HudMetric.values.toSet());
      final expectedDefault = HudWidgetLayout.defaultFor(HudMetric.speed);
      expect(layout[HudMetric.speed]!.col, expectedDefault.col);
    });

    test('corrupted stored JSON falls back to defaults rather than crashing',
        () async {
      SharedPreferences.setMockInitialValues({'hud_layout': 'not json at all'});
      final config = await Config.load();
      expect(config.hudLayout.keys.toSet(), HudMetric.values.toSet());
    });
  });

  group('deviceId', () {
    test('is generated once and then stable across reads', () async {
      final config = await freshConfig();
      final first = config.deviceId;
      final second = config.deviceId;
      expect(first, second);
      expect(first, isNotEmpty);
    });

    test('is a v4 UUID', () async {
      final config = await freshConfig();
      // xxxxxxxx-xxxx-4xxx-{8,9,a,b}xxx-xxxxxxxxxxxx
      final v4 = RegExp(
        r'^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$',
      );
      expect(v4.hasMatch(config.deviceId), isTrue,
          reason: 'got ${config.deviceId}');
    });

    test('persists across a fresh Config over the same preferences', () async {
      SharedPreferences.setMockInitialValues({});
      final first = await Config.load();
      final id = first.deviceId;

      final second = await Config.load();
      expect(second.deviceId, id,
          reason: 'a server distinguishing riders needs this to be stable');
    });
  });
}