import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:glp1_companion/features/health_sync/domain/entities/biometric_entry.dart';
import 'package:glp1_companion/features/health_sync/domain/repositories/health_sync_repository.dart';
import 'package:glp1_companion/features/health_sync/presentation/controllers/biometric_controller.dart';
import 'package:glp1_companion/features/nutrition/domain/entities/food_log_entry.dart';
import 'package:glp1_companion/features/nutrition/domain/entities/hydration_log_entry.dart';
import 'package:glp1_companion/features/nutrition/domain/entities/meal_type.dart';
import 'package:glp1_companion/features/nutrition/domain/repositories/nutrition_repository.dart';
import 'package:glp1_companion/features/nutrition/presentation/controllers/nutrition_controller.dart';
import 'package:glp1_companion/features/nutrition/presentation/screens/nutrition_screen.dart';

/// In-memory [INutritionRepository] fake with auto-incrementing ids, matching
/// the drift-backed behaviour the controller relies on.
class _FakeNutritionRepository implements INutritionRepository {
  final List<FoodLogEntry> _foods = [];
  final List<HydrationLogEntry> _waters = [];
  int _nextId = 1;

  @override
  Stream<List<FoodLogEntry>> watchFoodLogs({int limit = 500}) =>
      Stream.value(_foods.take(limit).toList());

  @override
  Future<List<FoodLogEntry>> getFoodLogs({
    int limit = 500,
    DateTime? from,
    DateTime? to,
  }) async =>
      _foods
          .where((entry) =>
              (from == null || !entry.timestamp.isBefore(from)) &&
              (to == null || entry.timestamp.isBefore(to)))
          .take(limit)
          .toList();

  @override
  Future<FoodLogEntry> saveFoodLog(FoodLogEntry entry) async {
    final stored = entry.copyWith(id: entry.id ?? _nextId++);
    _foods.removeWhere((existing) => existing.id == stored.id);
    _foods.insert(0, stored);
    return stored;
  }

  @override
  Future<void> deleteFoodLog(int id) async {
    _foods.removeWhere((entry) => entry.id == id);
  }

  @override
  Stream<List<HydrationLogEntry>> watchHydrationLogs({int limit = 500}) =>
      Stream.value(_waters.take(limit).toList());

  @override
  Future<List<HydrationLogEntry>> getHydrationLogs({
    int limit = 500,
    DateTime? from,
    DateTime? to,
  }) async =>
      _waters
          .where((entry) =>
              (from == null || !entry.timestamp.isBefore(from)) &&
              (to == null || entry.timestamp.isBefore(to)))
          .take(limit)
          .toList();

  @override
  Future<HydrationLogEntry> saveHydrationLog(HydrationLogEntry entry) async {
    final stored = entry.copyWith(id: entry.id ?? _nextId++);
    _waters.insert(0, stored);
    return stored;
  }

  @override
  Future<void> deleteHydrationLog(int id) async {
    _waters.removeWhere((entry) => entry.id == id);
  }
}

/// Empty [IHealthSyncRepository] fake for the weight-tracker card.
class _EmptyHealthSyncRepository implements IHealthSyncRepository {
  @override
  Stream<List<BiometricEntry>> watchBiometrics({int limit = 500}) =>
      Stream.value(const []);

  @override
  Future<List<BiometricEntry>> getBiometrics({
    int limit = 500,
    DateTime? from,
    DateTime? to,
  }) async =>
      const [];

  @override
  Future<BiometricEntry> saveBiometric(BiometricEntry entry) async => entry;

  @override
  Future<void> deleteBiometric(int id) async {}

  @override
  Future<BiometricEntry?> getLatestBiometric() async => null;

  @override
  Future<void> clearSyncedRange({
    required BiometricSource source,
    required DateTime start,
    required DateTime end,
  }) async {}
}

void main() {
  late _FakeNutritionRepository repository;

  setUp(() => repository = _FakeNutritionRepository());

  Future<void> pumpScreen(WidgetTester tester) async {
    // A tall viewport keeps the protein card, hydration card, and quick-add
    // buttons visible without scrolling.
    tester.view.physicalSize = const Size(1080, 2400);
    tester.view.devicePixelRatio = 1.0;
    addTearDown(tester.view.reset);

    await tester.pumpWidget(
      ProviderScope(
        overrides: [
          nutritionRepositoryProvider.overrideWithValue(repository),
          healthSyncRepositoryProvider
              .overrideWithValue(_EmptyHealthSyncRepository()),
        ],
        child: const MaterialApp(home: NutritionScreen()),
      ),
    );
    await tester.pumpAndSettle();
  }

  /// First [LinearProgressIndicator] is protein, second is hydration.
  double proteinBar(WidgetTester tester) => tester
      .widgetList<LinearProgressIndicator>(find.byType(LinearProgressIndicator))
      .first
      .value!;

  double hydrationBar(WidgetTester tester) => tester
      .widgetList<LinearProgressIndicator>(find.byType(LinearProgressIndicator))
      .elementAt(1)
      .value!;

  testWidgets('progress bars react to a new protein log entry',
      (tester) async {
    await pumpScreen(tester);

    expect(find.text('0.0g / 100g goal'), findsOneWidget);
    expect(proteinBar(tester), 0);

    final container = ProviderScope.containerOf(
      tester.element(find.byType(NutritionScreen)),
    );
    final logged = await container
        .read(nutritionControllerProvider.notifier)
        .logFood(
          mealType: MealType.breakfast,
          description: 'Greek yogurt bowl',
          proteinGrams: 40,
          calories: 220,
        );
    expect(logged, isTrue);
    await tester.pumpAndSettle();

    // 40 g of a 100 g target -> the meter and total update reactively.
    expect(find.text('40.0g / 100g goal'), findsOneWidget);
    expect(proteinBar(tester), closeTo(0.4, 1e-9));
    expect(hydrationBar(tester), 0);
  });

  testWidgets('quick-add water buttons advance the hydration meter',
      (tester) async {
    await pumpScreen(tester);

    expect(find.text('0 oz / 96 oz goal'), findsOneWidget);
    expect(hydrationBar(tester), 0);

    await tester.tap(find.text('+8.0 oz'));
    await tester.pumpAndSettle();

    expect(find.text('8 oz / 96 oz goal'), findsOneWidget);
    expect(hydrationBar(tester), closeTo(8 / 96, 1e-9));

    await tester.tap(find.text('+16.0 oz'));
    await tester.pumpAndSettle();

    expect(find.text('24 oz / 96 oz goal'), findsOneWidget);
    expect(hydrationBar(tester), closeTo(24 / 96, 1e-9));
  });

  testWidgets('both meters saturate and surface the success chips',
      (tester) async {
    await pumpScreen(tester);

    final container = ProviderScope.containerOf(
      tester.element(find.byType(NutritionScreen)),
    );
    final controller = container.read(nutritionControllerProvider.notifier);

    await controller.logFood(
      mealType: MealType.lunch,
      description: 'Chicken bowl',
      proteinGrams: 60,
      calories: 520,
      carbsGrams: 45,
      fatGrams: 18,
    );
    await controller.logFood(
      mealType: MealType.dinner,
      description: 'Salmon plate',
      proteinGrams: 40,
      calories: 480,
    );
    await controller.logWater(96);
    await tester.pumpAndSettle();

    expect(proteinBar(tester), 1);
    expect(hydrationBar(tester), 1);
    // Only the protein card carries a "Goal met" chip; the hydration card
    // signals completion through its saturated (teal) meter.
    expect(find.text('Goal met'), findsOneWidget);
    expect(find.text('100.0g / 100g goal'), findsOneWidget);
    expect(find.text('96 oz / 96 oz goal'), findsOneWidget);
  });
}