import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:flutter_background_geolocation/flutter_background_geolocation.dart' as bg;

import 'preferences.dart';
import 'l10n/app_localizations.dart';

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

  @override
  State<QrCodeScreen> createState() => _QrCodeScreenState();
}

class _QrCodeScreenState extends State<QrCodeScreen> {
  bool _scanned = false;

  Future<void> _applySettings(Uri uri) async {
    await Preferences.instance.setString(Preferences.url, '${uri.origin}${uri.path}');
    final parameters = uri.queryParameters;
    await _applyStringParameter(parameters, Preferences.id);
    await _applyStringParameter(parameters, Preferences.accuracy);
    await _applyIntParameter(parameters, Preferences.distance);
    await _applyIntParameter(parameters, Preferences.interval);
    await _applyIntParameter(parameters, Preferences.angle);
    await _applyIntParameter(parameters, Preferences.heartbeat);
    await _applyIntParameter(parameters, Preferences.fastestInterval);
    await _applyBoolParameter(parameters, Preferences.buffer);
    await _applyBoolParameter(parameters, Preferences.wakelock);
    await _applyBoolParameter(parameters, Preferences.stopDetection);
    await bg.BackgroundGeolocation.setConfig(Preferences.geolocationConfig());
  }

  Future<void> _applyStringParameter(Map<String, String> parameters, String key) async {
    final value = parameters[key];
    if (value != null) {
      await Preferences.instance.setString(key, value);
    }
  }

  Future<void> _applyIntParameter(Map<String, String> parameters, String key) async {
    final stringValue = parameters[key];
    if (stringValue != null) {
      final value = int.tryParse(stringValue);
      if (value != null) {
        await Preferences.instance.setInt(key, value);
      }
    }
  }

  Future<void> _applyBoolParameter(Map<String, String> parameters, String key) async {
    final value = parameters[key];
    if (value != null) {
      switch (value) {
        case 'false':
          await Preferences.instance.setBool(key, false);
          break;
        case 'true':
          await Preferences.instance.setBool(key, true);
          break;
      }
    }
  }

  void _onDetect(BarcodeCapture capture) async {
    if (_scanned) return;
    final barcode = capture.barcodes.first;
    final rawValue = barcode.rawValue;
    if (rawValue == null) return;
    final uri = Uri.tryParse(rawValue);
    if (uri == null || uri.scheme.isEmpty) return;
    _scanned = true;
    await _applySettings(uri);
    if (mounted) Navigator.pop(context);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(AppLocalizations.of(context)!.settingsTitle),
      ),
      body: MobileScanner(
        fit: BoxFit.cover,
        onDetect: _onDetect,
      ),
    );
  }
}