import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_database/firebase_database.dart';

class DatabaseService {
  final uid = FirebaseAuth.instance.currentUser!.uid;
  final db = FirebaseDatabase.instance.ref();

  Future<void> saveBMI(double value) async {
    final now = DateTime.now().toIso8601String();
    await db.child("users/$uid/bmi_history").push().set({
      "value": value,
      "time": now,
    });
  }

  Future<Map<String, double>> fetchLatestIoTData() async {
    final snapshot = await db.child("iot/latest").get();
    final data = Map<String, dynamic>.from(snapshot.value as Map);
    return {
      'height': (data['height'] as num).toDouble(),
      'weight': (data['weight'] as num).toDouble(),
    };
  }
}