import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:mqtt_client/mqtt_client.dart';
import '../services/mqtt_service.dart';
import '../services/supabase_service.dart';

class MonitoringScreen extends StatefulWidget {
  final VoidCallback? onProfileTap;
  const MonitoringScreen({super.key, this.onProfileTap});

  @override
  State<MonitoringScreen> createState() => _MonitoringScreenState();
}

class _MonitoringScreenState extends State<MonitoringScreen> {
  bool _isInitialLoading = true;
  double _prevSuhu       = 0;
  double _prevKelembapan = 0;
  double _prevIntensitas = 0;

  @override
  void initState() {
    super.initState();
    _initData();
  }

  Future<void> _initData() async {
    setState(() => _isInitialLoading = true);
    await _loadLimits();
    if (mounted) setState(() => _isInitialLoading = false);
  }

  Future<void> _loadLimits() async {
    try {
      final data = await SupabaseService().getBatasSensor();
      if (data != null && mounted) {
        Provider.of<MqttService>(context, listen: false).setLimits(
          double.parse(data['suhu_max'].toString()),
          double.parse(data['rh_max'].toString()),
          double.parse(data['suhu_min'].toString()),
          double.parse(data['rh_min'].toString()),
        );
      }
    } catch (e) {
      debugPrint('Error loading limits: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    final mqtt        = Provider.of<MqttService>(context);
    final curSuhu     = double.tryParse(mqtt.suhu)       ?? 0;
    final curHum      = double.tryParse(mqtt.kelembapan) ?? 0;
    final curLux      = double.tryParse(mqtt.intensitas) ?? 0;

    WidgetsBinding.instance.addPostFrameCallback((_) {
      _prevSuhu       = curSuhu;
      _prevKelembapan = curHum;
      _prevIntensitas = curLux;
    });

    return Scaffold(
      backgroundColor: Colors.black,
      body: SafeArea(
        child: _isInitialLoading
            ? const Center(child: CircularProgressIndicator(color: Colors.green))
            : RefreshIndicator(
                onRefresh: _initData,
                color: Colors.green,
                child: LayoutBuilder(
                  builder: (context, constraints) {
                    // Tinggi tersedia = tinggi layar dikurangi header
                    const headerHeight = 175.0; // header + timestamp + mode badge + padding
                    const gaps        = 15.0 * 2; // 2 gap antar 3 baris
                    const padding     = 20.0 * 2; // padding atas bawah
                    final available   = constraints.maxHeight - headerHeight - gaps - padding;
                    final cardH       = (available / 3).clamp(100.0, 180.0);

                    return SingleChildScrollView(
                      physics: const AlwaysScrollableScrollPhysics(),
                      child: ConstrainedBox(
                        constraints: BoxConstraints(minHeight: constraints.maxHeight),
                        child: Padding(
                          padding: const EdgeInsets.all(20),
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              // ── Header ──
                              Row(
                                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                                children: [
                                  Column(
                                    crossAxisAlignment: CrossAxisAlignment.start,
                                    children: [
                                      const Text('Monitoring',
                                          style: TextStyle(
                                              color: Colors.white,
                                              fontSize: 32,
                                              fontWeight: FontWeight.bold)),
                                      const Text('Sistem Pengeringan Kopi',
                                          style: TextStyle(color: Colors.grey, fontSize: 16)),
                                      const SizedBox(height: 5),
                                      Row(
                                        children: [
                                          Container(
                                            width: 8, height: 8,
                                            decoration: BoxDecoration(
                                              shape: BoxShape.circle,
                                              color: mqtt.client?.connectionStatus?.state ==
                                                      MqttConnectionState.connected
                                                  ? Colors.green
                                                  : Colors.red,
                                            ),
                                          ),
                                          const SizedBox(width: 8),
                                          Text(
                                            mqtt.client?.connectionStatus?.state ==
                                                    MqttConnectionState.connected
                                                ? 'Connected'
                                                : 'Disconnected',
                                            style: TextStyle(
                                              color: mqtt.client?.connectionStatus?.state ==
                                                      MqttConnectionState.connected
                                                  ? Colors.green
                                                  : Colors.red,
                                              fontSize: 12,
                                            ),
                                          ),
                                        ],
                                      ),
                                    ],
                                  ),
                                  GestureDetector(
                                    onTap: widget.onProfileTap,
                                    child: const CircleAvatar(
                                      backgroundColor: Color(0xFF1A1A1A),
                                      radius: 25,
                                      child: Icon(Icons.person, color: Colors.green),
                                    ),
                                  ),
                                ],
                              ),
                              const SizedBox(height: 6),

                              // ── Timestamp ──
                              Text('Update: ${mqtt.timestamp}',
                                  style: const TextStyle(color: Colors.grey, fontSize: 11)),
                              const SizedBox(height: 10),

                              // ── Mode Badge ──
                              Container(
                                padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                                decoration: BoxDecoration(
                                  color: mqtt.mode == 'manual'
                                      ? Colors.orange.withOpacity(0.2)
                                      : Colors.green.withOpacity(0.2),
                                  borderRadius: BorderRadius.circular(20),
                                  border: Border.all(
                                    color: mqtt.mode == 'manual' ? Colors.orange : Colors.green,
                                  ),
                                ),
                                child: Text(
                                  'Mode: ${mqtt.mode.toUpperCase()}',
                                  style: TextStyle(
                                    color: mqtt.mode == 'manual' ? Colors.orange : Colors.green,
                                    fontSize: 12,
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                              ),
                              const SizedBox(height: 15),

                              // ── Baris 1: Suhu & Kelembaban ──
                              SizedBox(
                                height: cardH,
                                child: Row(
                                  children: [
                                    Expanded(
                                      child: _buildSensorCard(
                                        title: 'Suhu',
                                        prev: _prevSuhu,
                                        cur: curSuhu,
                                        suffix: '°C',
                                        dec: 1,
                                        icon: Icons.thermostat,
                                        color: curSuhu > mqtt.maxSuhu ? Colors.red : Colors.redAccent,
                                        isAlert: curSuhu > mqtt.maxSuhu,
                                        isLow: curSuhu < mqtt.minSuhu,
                                        onTap: () => Navigator.pushNamed(context, '/analytics',
                                            arguments: {'title': 'Grafik Suhu (°C)', 'color': Colors.redAccent, 'value': '${mqtt.suhu}°C'}),
                                      ),
                                    ),
                                    const SizedBox(width: 15),
                                    Expanded(
                                      child: _buildSensorCard(
                                        title: 'Kelembaban',
                                        prev: _prevKelembapan,
                                        cur: curHum,
                                        suffix: '%',
                                        dec: 1,
                                        icon: Icons.water_drop,
                                        color: curHum > mqtt.maxRh ? Colors.red : Colors.cyan,
                                        isAlert: curHum > mqtt.maxRh,
                                        isLow: curHum < mqtt.minRh,
                                        onTap: () => Navigator.pushNamed(context, '/analytics',
                                            arguments: {'title': 'Grafik Kelembaban (%)', 'color': Colors.cyan, 'value': '${mqtt.kelembapan}%'}),
                                      ),
                                    ),
                                  ],
                                ),
                              ),
                              const SizedBox(height: 15),

                              // ── Baris 2: Cahaya full width ──
                              SizedBox(
                                height: cardH,
                                width: double.infinity,
                                child: _buildSensorCard(
                                  title: 'Cahaya',
                                  prev: _prevIntensitas,
                                  cur: curLux,
                                  suffix: ' Lux',
                                  dec: 1,
                                  icon: Icons.wb_sunny,
                                  color: Colors.orange,
                                  onTap: () => Navigator.pushNamed(context, '/analytics',
                                      arguments: {'title': 'Grafik Cahaya (Lux)', 'color': Colors.orange, 'value': '${mqtt.intensitas} Lux'}),
                                ),
                              ),
                              const SizedBox(height: 15),

                              // ── Baris 3: Kipas 1 & Kipas 2 ──
                              SizedBox(
                                height: cardH,
                                child: Row(
                                  children: [
                                    Expanded(
                                      child: _buildControlCard(
                                        'Kipas 1\n(Intake)',
                                        mqtt.isKipas1On,
                                        (val) => mqtt.perintahKipas("1", val),
                                        mqtt,
                                      ),
                                    ),
                                    const SizedBox(width: 15),
                                    Expanded(
                                      child: _buildControlCard(
                                        'Kipas 2\n(Exhaust)',
                                        mqtt.isKipas2On,
                                        (val) => mqtt.perintahKipas("2", val),
                                        mqtt,
                                      ),
                                    ),
                                  ],
                                ),
                              ),

                              // ── Alert Banner ──
                              if (curSuhu > mqtt.maxSuhu || curHum > mqtt.maxRh)
                                Container(
                                  margin: const EdgeInsets.only(top: 15),
                                  padding: const EdgeInsets.all(15),
                                  decoration: BoxDecoration(
                                    color: Colors.red.withOpacity(0.2),
                                    borderRadius: BorderRadius.circular(15),
                                    border: Border.all(color: Colors.red),
                                  ),
                                  child: const Row(
                                    children: [
                                      Icon(Icons.warning_amber_rounded, color: Colors.red),
                                      SizedBox(width: 10),
                                      Expanded(
                                        child: Text(
                                          'Peringatan: Parameter pengeringan melewati batas aman!',
                                          style: TextStyle(
                                              color: Colors.red,
                                              fontWeight: FontWeight.bold,
                                              fontSize: 12),
                                        ),
                                      ),
                                    ],
                                  ),
                                ),
                                if (curSuhu < mqtt.minSuhu || curHum < mqtt.minRh)
                                  Container(
                                    margin: const EdgeInsets.only(top: 15),
                                    padding: const EdgeInsets.all(15),
                                    decoration: BoxDecoration(
                                      color: Colors.blue.withOpacity(0.2),
                                      borderRadius: BorderRadius.circular(15),
                                      border: Border.all(color: Colors.blue),
                                    ),
                                    child: const Row(
                                      children: [
                                        Icon(Icons.info_outline, color: Colors.blue),
                                        SizedBox(width: 10),
                                        Expanded(
                                          child: Text(
                                            'Info: Parameter pengeringan di bawah batas minimum!',
                                            style: TextStyle(
                                                color: Colors.blue,
                                                fontWeight: FontWeight.bold,
                                                fontSize: 12),
                                          ),
                                        ),
                                      ],
                                    ),
                                  ),
                            ],
                          ),
                        ),
                      ),
                    );
                  },
                ),
              ),
      ),
    );
  }

  Widget _buildSensorCard({
    required String title,
    required double prev,
    required double cur,
    required String suffix,
    required int dec,
    required IconData icon,
    required Color color,
    bool isAlert = false,
    bool isLow = false,
    VoidCallback? onTap,
  }) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        width: double.infinity,
        height: double.infinity,
        padding: const EdgeInsets.all(12),
        decoration: BoxDecoration(
          color: isAlert ? Colors.red.withOpacity(0.1) : isLow ? Colors.blue.withOpacity(0.1) : const Color(0xFF1A1A1A),
          borderRadius: BorderRadius.circular(20),
          border: isAlert ? Border.all(color: Colors.red, width: 2) : isLow ? Border.all(color: Colors.blue, width: 2) : null,
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(icon, color: color, size: 32),
            const SizedBox(height: 6),
            Text(title, style: const TextStyle(color: Colors.grey, fontSize: 12)),
            const SizedBox(height: 4),
            TweenAnimationBuilder<double>(
              tween: Tween<double>(begin: prev, end: cur),
              duration: const Duration(milliseconds: 800),
              curve: Curves.easeOutCubic,
              builder: (context, value, _) => FittedBox(
                fit: BoxFit.scaleDown,
                child: Text(
                  '${value.toStringAsFixed(dec)}$suffix',
                  style: const TextStyle(
                      color: Colors.white,
                      fontSize: 22,
                      fontWeight: FontWeight.bold),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildControlCard(
    String title,
    bool isOn,
    Function(bool) onChanged,
    MqttService mqtt,
  ) {
    return Container(
      width: double.infinity,
      height: double.infinity,
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: const Color(0xFF1A1A1A),
        borderRadius: BorderRadius.circular(20),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Row(
            children: [
              Icon(Icons.settings_input_component,
                  color: isOn ? Colors.green : Colors.grey, size: 16),
              const SizedBox(width: 6),
              Expanded(
                child: Text(title,
                    style: const TextStyle(
                        color: Colors.white,
                        fontSize: 11,
                        fontWeight: FontWeight.bold)),
              ),
            ],
          ),
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('Mode: ${mqtt.mode.toUpperCase()}',
                  style: const TextStyle(
                      color: Colors.green, fontSize: 9, fontWeight: FontWeight.bold)),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    isOn ? 'ON' : 'OFF',
                    style: TextStyle(
                        color: isOn ? Colors.green : Colors.grey,
                        fontSize: 12,
                        fontWeight: FontWeight.bold),
                  ),
                  SizedBox(
                    height: 28,
                    child: Switch(
                      value: isOn,
                      onChanged: mqtt.mode == 'manual' ? onChanged : null,
                      activeColor: Colors.green,
                      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
                    ),
                  ),
                ],
              ),
            ],
          ),
        ],
      ),
    );
  }
}