import 'dart:io';
import 'package:flutter/foundation.dart';

class HealthMetric {
  final DateTime timestamp;
  final double value;
  final String unit;

  const HealthMetric({
    required this.timestamp,
    required this.value,
    required this.unit,
  });
}

abstract class IHealthGateway {
  Future<bool> requestPermissions();
  Future<List<HealthMetric>> fetchWeightHistory({
    required DateTime start,
    required DateTime end,
  });
  Future<List<HealthMetric>> fetchWorkouts({
    required DateTime start,
    required DateTime end,
  });
}

class PlatformHealthGateway implements IHealthGateway {
  @override
  Future<bool> requestPermissions() async {
    if (kIsWeb || (!Platform.isAndroid && !Platform.isIOS)) {
      return false;
    }
    return true;
  }

  @override
  Future<List<HealthMetric>> fetchWeightHistory({
    required DateTime start,
    required DateTime end,
  }) async {
    if (kIsWeb || (!Platform.isAndroid && !Platform.isIOS)) {
      return [];
    }
    return [];
  }

  @override
  Future<List<HealthMetric>> fetchWorkouts({
    required DateTime start,
    required DateTime end,
  }) async {
    if (kIsWeb || (!Platform.isAndroid && !Platform.isIOS)) {
      return [];
    }
    return [];
  }
}