import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:tugasakhir/screens/history.dart';
import 'package:tugasakhir/screens/register.dart';  

class HomeScreen extends StatefulWidget {
  const HomeScreen({Key? key}) : super(key: key);

  @override
  State<HomeScreen> createState() => _HomeScreenState();
}

Color warnaBMI(double bmi) {
  if (bmi < 18.5) return Colors.blue;  
  if (bmi <= 24.9) return Colors.green;  
  if (bmi <= 29.9) return Colors.orange; 
  return Colors.red;  
}

class _HomeScreenState extends State<HomeScreen> {
  double beratBadan = 0.0;
  double tinggiBadan = 0.0;
  double nilaiBMI = 0.0;
  String kategori = '';
  Color warna = Colors.blue;
  DateTime tanggalPenimbangan = DateTime.now();
  String selectedUser = ''; 

  final DatabaseReference _database = FirebaseDatabase.instance.ref();
  final FirebaseFirestore _firestore = FirebaseFirestore.instance;

  List<String> userNames = []; 
  @override
  void initState() {
    super.initState();
    _fetchUsers();

    
    _database.child('sensor').onValue.listen((event) {
      final data = event.snapshot.value as Map;
      setState(() {
        beratBadan = (data['berat'] as num).toDouble();
        tinggiBadan = (data['tinggi'] as num).toDouble();
        nilaiBMI = hitungBMI(beratBadan, tinggiBadan);
        kategori = kategoriBMI(nilaiBMI);
        warna = warnaBMI(nilaiBMI);
        tanggalPenimbangan = DateTime.now();
      });
    });
  }

 
  Future<void> _fetchUsers() async {
    try {

      QuerySnapshot snapshot = await _firestore.collection('users').get();
      List<String> users = snapshot.docs.map((doc) => doc['nama'] as String).toList();

      setState(() {
        userNames = users; 
        if (userNames.isNotEmpty) {
          selectedUser = userNames[0]; 
        }
      });
    } catch (e) {
      print('Error fetching users: $e');
    }
  }

  double hitungBMI(double berat, double tinggi) {
    if (tinggi == 0) return 0;
    double tinggiMeter = tinggi / 100;
    return berat / (tinggiMeter * tinggiMeter);
  }

  String kategoriBMI(double bmi) {
    if (bmi < 18.5) return 'Kurus';
    if (bmi <= 24.9) return 'Normal';
    if (bmi <= 29.9) return 'Gemuk';
    return 'Obesitas';
  }

  String saranBMI(double bmi) {
    if (bmi < 18.5) return 'Perbanyak asupan kalori dan protein.';
    if (bmi <= 24.9) return 'Pertahankan pola makan dan gaya hidup sehat.';
    if (bmi <= 29.9) return 'Kurangi makanan tinggi lemak dan tingkatkan aktivitas fisik.';
    return 'Konsultasikan ke ahli gizi dan lakukan olahraga rutin.';
  }

  IconData ikonBMI(double bmi) {
    if (bmi < 18.5) return Icons.accessibility_new; 
    if (bmi <= 24.9) return Icons.mood; 
    if (bmi <= 29.9) return Icons.sentiment_dissatisfied; 
    return Icons.warning; 
  }

 
  void saveData() async {
    try {
      await _firestore.collection('history_timbangan').add({
        'berat': beratBadan,
        'tinggi': tinggiBadan,
        'bmi': nilaiBMI,
        'timestamp': FieldValue.serverTimestamp(),
        'user': selectedUser, 
      });

      await _database.child('users/$selectedUser/history').set({
        'tanggal': tanggalPenimbangan.toIso8601String(),
        'berat': beratBadan,
        'tinggi': tinggiBadan,
        'bmi': nilaiBMI,
      });

      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Data Berhasil Disimpan ')),
      );
    } catch (e) {
      print('Error saving data: $e');
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Gagal menyimpan data')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: const Color(0xFF59A4EB),
        elevation: 0,
        title: Row(
          children: [
            const Icon(Icons.account_circle, size: 36, color: Colors.white),
            const SizedBox(width: 10),
            // Dropdown untuk memilih pengguna dari Firestore
            DropdownButton<String>(
              value: selectedUser.isEmpty ? null : selectedUser,
              icon: const Icon(Icons.arrow_drop_down, color: Colors.white),
              style: const TextStyle(color: Colors.white),
              dropdownColor: const Color(0xFF59A4EB),
              onChanged: (String? newValue) {
                setState(() {
                  selectedUser = newValue!; // Update selected user
                });
              },
              items: userNames
                  .map<DropdownMenuItem<String>>((String value) {
                return DropdownMenuItem<String>(
                  value: value,
                  child: Text(value),
                );
              }).toList(),
            ),
            const Spacer(),
            // IconButton untuk menavigasi ke halaman Register
            IconButton(
              icon: const Icon(Icons.add, color: Colors.white), // Tombol tambah pengguna
              onPressed: () {
                // Navigasi ke halaman RegisterScreen
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const RegisterScreen()),
                ).then((_) {
                  // Panggil _fetchUsers() untuk reload data setelah kembali dari RegisterScreen
                  _fetchUsers();
                });
              },
            ),
          ],
        ),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
        child: Column(
          children: [
            const Center(
              child: Text(
                'SmartScale',
                style: TextStyle(
                  fontSize: 30,
                  fontWeight: FontWeight.bold,
                  color: Color(0xFF59A4EB),
                ),
              ),
            ),
            const SizedBox(height: 24),
            // Menampilkan hasil pengukuran
            Card(
              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
              elevation: 6,
              color: Colors.white,
              child: Padding(
                padding: const EdgeInsets.all(20.0),
                child: Column(
                  children: [
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                      children: [
                        _buildDataColumn('${beratBadan.toStringAsFixed(1)} kg', 'Berat'),
                        _buildDataColumn('${tinggiBadan.toStringAsFixed(1)} cm', 'Tinggi'),
                        Column(
                          children: [
                            Text(
                              nilaiBMI.toStringAsFixed(1),
                              style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold, color: warna),
                            ),
                            const SizedBox(height: 6),
                            Icon(ikonBMI(nilaiBMI), color: warna, size: 28),
                            const SizedBox(height: 6),
                            Text(kategori, style: TextStyle(fontSize: 14, color: warna, fontWeight: FontWeight.w600)),
                            const Text('BMI', style: TextStyle(fontSize: 16)),
                          ],
                        ),
                      ],
                    ),
                    const SizedBox(height: 16),
                    Text(
                      saranBMI(nilaiBMI),
                      style: const TextStyle(fontSize: 14, fontStyle: FontStyle.italic, color: Colors.grey),
                    ),
                    const SizedBox(height: 10),
                    Text(
                      'Terakhir diukur: ${tanggalPenimbangan.day}/${tanggalPenimbangan.month}/${tanggalPenimbangan.year}',
                      style: const TextStyle(fontSize: 13, color: Colors.black54),
                    ),
                    Text(
                      'Ulangi penimbangan: ${tanggalPenimbangan.add(const Duration(days: 7)).day}/${tanggalPenimbangan.add(const Duration(days: 7)).month}/${tanggalPenimbangan.add(const Duration(days: 7)).year}',
                      style: const TextStyle(fontSize: 13, color: Colors.black54),
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 30),
            ElevatedButton(
              style: ElevatedButton.styleFrom(
                backgroundColor: const Color(0xFF59A4EB), // Blue color for the button
                padding: const EdgeInsets.symmetric(vertical: 15, horizontal: 30),
              ),
              onPressed: saveData, // Menyimpan data
              child: const Text(
                'Save Data',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: Colors.white),
              ),
            ),
            const SizedBox(height: 30),
            ElevatedButton(
              style: ElevatedButton.styleFrom(
                backgroundColor: const Color(0xFF59A4EB), // Blue color for the button
                padding: const EdgeInsets.symmetric(vertical: 15, horizontal: 30),
              ),
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const HistoryScreen()), // Navigasi ke HistoryScreen
                );
              },
              child: const Text(
                'Weight Trend',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: Colors.white),
              ),
            ),
          ],
        ),
      ),
    );
  }

  // Fungsi untuk membuat kolom data
  Widget _buildDataColumn(String value, String label) {
    return Column(
      children: [
        Text(
          value,
          style: const TextStyle(fontSize: 24, fontWeight: FontWeight.bold, color: Color(0xFF638BF7)),
        ),
        const SizedBox(height: 6),
        Text(label, style: const TextStyle(fontSize: 16)),
      ],
    );
  }
}