home_page.dart

// PUT CODE HERE BELOW

@override
  void initState() {
    super.initState();
    _updatePrayerTimes(); // jalankan saat awal
  }

  // ================================================================
  // LOGIKA INTI: UPDATE DATA WAKTU SHOLAT & LOKASI
  // ================================================================
  /// 🔹 Mengambil lokasi, mendeteksi kota terdekat, dan memuat jadwal sholat
  ///
  /// Diagram alur:
  ///
  ///  [GPS Position]
  ///  [Kota terdekat (fuzzy match)]
  ///  [Ambil data GitHub jadwal sholat]
  ///  [Hitung waktu sholat terdekat + countdown]

 Future<void> _updatePrayerTimes() async {
    setState(() => _isLoading = true);

    if (await _requestLocationPermission()) {
      try {
        // Ambil posisi GPS user (timeout 10 detik)
        Position position =
            await Geolocator.getCurrentPosition(
              desiredAccuracy: LocationAccuracy.high,
            ).timeout(
              const Duration(seconds: 10),
              onTimeout: () =>
                  throw Exception("Gagal mendapatkan lokasi (timeout)"),
            );

        // Cari kota terdekat dari koordinat
        String city;
        try {
          city = await getClosestCity(position.latitude, position.longitude);
        } catch (_) {
          city = "semarang"; // fallback default
        }

        // Konversi koordinat ke nama lokasi manusiawi
        List<Placemark> placemarks = await placemarkFromCoordinates(
          position.latitude,
          position.longitude,
        );
        Placemark place = placemarks.isNotEmpty
            ? placemarks.first
            : Placemark();

        // Ambil bulan & tahun sekarang
        String month = DateFormat('MM').format(DateTime.now());
        String year = DateFormat('yyyy').format(DateTime.now());

        // Ambil jadwal sholat & hitung waktu terdekat
        _jadwalSholat = await fetchJadwalSholat(city, month, year);
        _calculateNextPrayer();

        // Update tampilan UI
        setState(() {
          _location =
              "${place.subAdministrativeArea ?? ''}, ${place.locality ?? ''}";
          _backgroundImage = _getBackgroundImage(DateTime.now());
          _isLoading = false;
        });
      } catch (e) {
        _showErrorDialog("Gagal mengambil data: ${e.toString()}");
        setState(() => _isLoading = false);
      }
    } else {
      _showErrorDialog(
        "Izin lokasi ditolak. Aktifkan lokasi untuk melanjutkan.",
      );
      setState(() => _isLoading = false);
    }
  }

  // ================================================================
  // API CALL: AMBIL DATA JADWAL SHOLAT DARI GITHUB
  // ================================================================
  /// 🔹 Mengambil data JSON jadwal sholat berdasarkan kota, bulan, dan tahun.
  /// 🔹 Data disimpan ke cache agar bisa diakses offline.
  Future<List<dynamic>> fetchJadwalSholat(
    String city,
    String month,
    String year,
  ) async {
    final prefs = await SharedPreferences.getInstance();
    final cacheKey = "$city-$year-$month";

    // Gunakan cache jika tersedia
    final cachedData = prefs.getString(cacheKey);
    if (cachedData != null) {
      return json.decode(cachedData) as List<dynamic>;
    }

    // Fetch dari GitHub repo jadwalsholatorg
    final url =
        'https://raw.githubusercontent.com/lakuapik/jadwalsholatorg/master/adzan/$city/$year/$month.json';
    final response = await http.get(Uri.parse(url));

    if (response.statusCode == 200) {
      await prefs.setString(cacheKey, response.body);
      return json.decode(response.body) as List<dynamic>;
    }

    // Fallback ke data tahun 2019 jika gagal
    final fallbackUrl =
        'https://raw.githubusercontent.com/lakuapik/jadwalsholatorg/master/adzan/$city/2019/$month.json';
    final fallbackResponse = await http.get(Uri.parse(fallbackUrl));

    if (fallbackResponse.statusCode == 200) {
      await prefs.setString(cacheKey, fallbackResponse.body);
      return json.decode(fallbackResponse.body) as List<dynamic>;
    }

    throw Exception('Gagal memuat jadwal sholat untuk $city ($month-$year)');
  }

  // ================================================================
  // LOGIKA FUZZY MATCH: DETEKSI KOTA TERDEKAT
  // ================================================================
  /// 🔹 Mencocokkan nama kota pengguna dengan daftar kota dari GitHub.
  ///
  /// 🔸 Contoh:
  /// "Jakarta Selatan" → dicocokkan → "jakarta"
  Future<String> getClosestCity(double userLat, double userLon) async {
    final response = await http.get(
      Uri.parse(
        'https://raw.githubusercontent.com/lakuapik/jadwalsholatorg/master/kota.json',
      ),
    );
    if (response.statusCode != 200) throw Exception('Gagal memuat daftar kota');

    final List<dynamic> cityList = json.decode(response.body);
    List<Placemark> placemarks = await placemarkFromCoordinates(
      userLat,
      userLon,
    );
    Placemark place = placemarks.first;

    String userCity =
        (place.subAdministrativeArea ??
                place.locality ??
                place.administrativeArea ??
                "")
            .toLowerCase()
            .replaceAll(" ", "");

    double bestScore = 0.0;
    String bestMatch = cityList.first;
    for (var city in cityList) {
      double score = city.toString().similarityTo(userCity);
      if (score > bestScore) {
        bestScore = score;
        bestMatch = city.toString();
      }
    }
    return bestMatch;
  }

  // ================================================================
  // PERHITUNGAN: WAKTU SHOLAT BERIKUTNYA & COUNTDOWN
  // ================================================================
  /// 🔹 Menghitung waktu sholat berikutnya berdasarkan jadwal hari ini.
  /// 🔹 Menampilkan countdown waktu tersisa.
  void _calculateNextPrayer() {
    if (_jadwalSholat == null || _jadwalSholat!.isEmpty) return;

    final now = DateTime.now();
    final format = DateFormat('HH:mm');
    final todayDate = DateFormat('yyyy-MM-dd').format(now);

    var todaySchedule = _jadwalSholat?.firstWhere(
      (e) => e['tanggal'] == todayDate,
      orElse: () => null,
    );
    if (todaySchedule == null) return;

    // Helper untuk parsing waktu
    DateTime parseTime(String hhmm) {
      final t = format.parse(hhmm);
      return DateTime(now.year, now.month, now.day, t.hour, t.minute);
    }

    // Peta jadwal sholat
    final prayers = {
      "Shubuh": parseTime(todaySchedule['shubuh']),
      "Dzuhur": parseTime(todaySchedule['dzuhur']),
      "Ashar": parseTime(todaySchedule['ashr']),
      "Maghrib": parseTime(todaySchedule['magrib']),
      "Isya": parseTime(todaySchedule['isya']),
    };

    // Cari waktu sholat berikutnya
    String nextPrayer = "Shubuh";
    Duration? closest;
    prayers.forEach((name, time) {
      final diff = time.difference(now);
      if (diff > Duration.zero && (closest == null || diff < closest!)) {
        closest = diff;
        nextPrayer = name;
      }
    });

    setState(() {
      _prayerName = nextPrayer;
      _timeRemaining = closest;
      _prayerTime = closest != null
          ? DateFormat('HH:mm').format(prayers[nextPrayer]!)
          : "N/A";
    });

    // Timer countdown
    _countdownTimer?.cancel();
    _countdownTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
      final remaining = prayers[nextPrayer]!.difference(DateTime.now());
      if (remaining.isNegative) {
        timer.cancel();
        _calculateNextPrayer();
      } else {
        setState(() => _timeRemaining = remaining);
      }
    });
  }

  // ================================================================
  // PERMINTAAN IZIN AKSES LOKASI
  // ================================================================
  /// 🔹 Meminta izin lokasi dari pengguna.
  Future<bool> _requestLocationPermission() async {
    var status = await Permission.location.status;
    if (status.isGranted) return true;
    if (status.isDenied) {
      status = await Permission.location.request();
      return status.isGranted;
    }
    if (status.isPermanentlyDenied) {
      await openAppSettings();
    }
    return false;
  }

  // ================================================================
  // DIALOG ERROR
  // ================================================================
  /// 🔹 Menampilkan dialog jika terjadi kesalahan (mis. gagal lokasi).
  void _showErrorDialog(String msg) {
    showDialog(
      context: context,
      builder: (_) => AlertDialog(
        title: const Text("Terjadi Kesalahan"),
        content: Text(msg),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text("OK"),
          ),
        ],
      ),
    );
  }