import 'package:flutter/material.dart';
import 'package:traccar_client/bridge/location_bridge.dart';
import 'package:traccar_client/preferences.dart';

class SettingsScreen extends StatefulWidget {
  const SettingsScreen({super.key});

  @override
  State<SettingsScreen> createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State<SettingsScreen> {
  late TextEditingController _serverUrlController;
  late TextEditingController _deviceIdController;
  late int _accuracy;
  late int _distanceFilter;
  late int _interval;
  late int _heartbeat;
  late bool _offlineBuffer;
  late bool _stopDetection;

  @override
  void initState() {
    super.initState();
    _serverUrlController = TextEditingController(text: Preferences.serverUrl);
    _deviceIdController = TextEditingController(text: Preferences.deviceId);
    _accuracy = Preferences.accuracy;
    _distanceFilter = Preferences.distanceFilter;
    _interval = Preferences.interval;
    _heartbeat = Preferences.heartbeat;
    _offlineBuffer = Preferences.offlineBuffer;
    _stopDetection = Preferences.stopDetection;
  }

  @override
  void dispose() {
    _serverUrlController.dispose();
    _deviceIdController.dispose();
    super.dispose();
  }

  Future<void> _saveSettings() async {
    await Preferences.setServerUrl(_serverUrlController.text);
    await Preferences.setDeviceId(_deviceIdController.text);
    await Preferences.setAccuracy(_accuracy);
    await Preferences.setDistanceFilter(_distanceFilter);
    await Preferences.setInterval(_interval);
    await Preferences.setHeartbeat(_heartbeat);
    await Preferences.setOfflineBuffer(_offlineBuffer);
    await Preferences.setStopDetection(_stopDetection);

    await LocationBridge.updateConfig({
      'serverUrl': _serverUrlController.text,
      'deviceId': _deviceIdController.text,
      'accuracy': _accuracy,
      'distanceFilter': _distanceFilter,
      'interval': _interval,
      'heartbeat': _heartbeat,
      'offlineBuffer': _offlineBuffer,
      'stopDetection': _stopDetection,
    });

    if (mounted) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text('Settings saved')));
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Settings')),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          _buildSectionHeader('Server'),
          _buildTextField('Server URL', _serverUrlController),
          _buildTextField('Device ID', _deviceIdController),
          const SizedBox(height: 16),
          _buildSectionHeader('Location'),
          _buildAccuracyDropdown(),
          _buildNumberField('Distance Filter (m)', _distanceFilter, 0, 1000),
          _buildNumberField('Update Interval (s)', _interval, 30, 3600),
          _buildNumberField('Heartbeat (s)', _heartbeat, 60, 3600),
          const SizedBox(height: 16),
          _buildSectionHeader('Advanced'),
          SwitchListTile(
            title: const Text('Offline Buffering'),
            subtitle: const Text('Queue locations when offline'),
            value: _offlineBuffer,
            onChanged: (v) => setState(() => _offlineBuffer = v),
          ),
          SwitchListTile(
            title: const Text('Stop Detection'),
            subtitle: const Text('Auto-stop when stationary'),
            value: _stopDetection,
            onChanged: (v) => setState(() => _stopDetection = v),
          ),
          const SizedBox(height: 24),
          ElevatedButton(
            onPressed: _saveSettings,
            child: const Text('Save Settings'),
          ),
        ],
      ),
    );
  }

  Widget _buildSectionHeader(String title) {
    return Padding(
      padding: const EdgeInsets.only(top: 16, bottom: 8),
      child: Text(
        title,
        style: Theme.of(
          context,
        ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
      ),
    );
  }

  Widget _buildTextField(
    String label,
    TextEditingController controller, {
    bool obscure = false,
  }) {
    return TextField(
      controller: controller,
      decoration: InputDecoration(labelText: label),
      obscureText: obscure,
    );
  }

  Widget _buildAccuracyDropdown() {
    return DropdownButtonFormField<int>(
      // ignore: deprecated_member_use
      value: _accuracy,
      decoration: const InputDecoration(labelText: 'Accuracy'),
      items: const [
        DropdownMenuItem(value: 0, child: Text('High')),
        DropdownMenuItem(value: 1, child: Text('High Accuracy')),
        DropdownMenuItem(value: 2, child: Text('Balanced')),
        DropdownMenuItem(value: 3, child: Text('Low')),
      ],
      onChanged: (v) => setState(() => _accuracy = v!),
    );
  }

  Widget _buildNumberField(String label, int value, int min, int max) {
    return TextFormField(
      initialValue: value.toString(),
      decoration: InputDecoration(labelText: label),
      keyboardType: TextInputType.number,
      validator: (v) {
        final parsed = int.tryParse(v ?? '');
        if (parsed == null || parsed < min || parsed > max) {
          return 'Must be between $min and $max';
        }
        return null;
      },
      onSaved: (v) {
        final parsed = int.tryParse(v ?? '');
        if (parsed != null) {
          if (label.contains('Distance')) {
            _distanceFilter = parsed;
          } else if (label.contains('Interval')) {
            _interval = parsed;
          } else if (label.contains('Heartbeat')) {
            _heartbeat = parsed;
          }
        }
      },
    );
  }
}