// * Settings screen for the LUPUS app
// * Allows configuration of:
// * - File storage location
// * - GPS tracking interval
// * All settings are persisted using SharedPreferences

import 'package:flutter/material.dart';
import 'package:fforte/l10n/app_localizations.dart';
import 'package:shared_preferences/shared_preferences.dart';

// * Widget for the settings screen
class Settings extends StatefulWidget {
  const Settings({super.key});

  @override
  State<Settings> createState() => _SettingsState();
}

// * State class for the settings screen
class _SettingsState extends State<Settings> {
  // Default tracking interval in seconds
  int _trackingInterval = 60;

  @override
  void initState() {
    super.initState();
    _loadSettings();  // Load saved settings on start
  }

  // * Load settings from SharedPreferences
  Future<void> _loadSettings() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    setState(() {
      // Load tracking interval or use default (60 seconds)
      _trackingInterval = prefs.getInt('trackingInterval') ?? 60;
    });
  }

  // * Save new tracking interval
  // * @param value The new interval in seconds
  Future<void> _saveTrackingInterval(int value) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setInt('trackingInterval', value);
    setState(() {
      _trackingInterval = value;
    });
  }

  // * Get configured save directory
  // * @return The configured directory or empty string
  Future<String> _getSaveDir() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    final String saveDir = prefs.getString('saveDir') ?? "";
    return saveDir;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(AppLocalizations.of(context)!.settings),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // * File location section
            Text(
              AppLocalizations.of(context)!.filelocation,
              style: const TextStyle(fontSize: 20),
            ),
            // Display current save directory
            FutureBuilder(
              future: _getSaveDir(),
              builder: (context, snapshot) {
                if (snapshot.connectionState == ConnectionState.done) {
                  return Text(snapshot.data ?? "");
                } else {
                  return const CircularProgressIndicator();
                }
              }
            ),
            // Button to open directory selection
            ElevatedButton(
              onPressed: () {},
              child: Text(AppLocalizations.of(context)!.open)
            ),
            const SizedBox(height: 24),

            // * Tracking interval section
            const Text(
              'Tracking Interval (Sekunden)',
              style: TextStyle(fontSize: 20),
            ),
            // Slider for interval adjustment
            // - Minimum: 10 seconds
            // - Maximum: 300 seconds (5 minutes)
            // - 29 divisions for precise control
            Slider(
              value: _trackingInterval.toDouble(),
              min: 10,
              max: 300,
              divisions: 29,
              label: _trackingInterval.toString(),
              onChanged: (double value) {
                _saveTrackingInterval(value.round());
              },
            ),
            // Display current interval
            Text('Aktuelles Intervall: $_trackingInterval Sekunden'),
          ],
        ),
      ),
    );
  }
}