import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:geolocator/geolocator.dart';
import 'package:geocoding/geocoding.dart';
import 'package:http/http.dart' as http;

void main() {
  runApp(const WalkerApp());
}

class WalkerApp extends StatelessWidget {
  const WalkerApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Blockcatcher',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: const TrackingScreen(),
    );
  }
}

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

  @override
  State<TrackingScreen> createState() => _TrackingScreenState();
}

class _TrackingScreenState extends State<TrackingScreen> {
  bool _tracking = false;
  List<String> _logs = [];
  Timer? _timer;

  @override
  void dispose() {
    _timer?.cancel();
    super.dispose();
  }

  Future<void> _startTracking() async {
    final permission = await Geolocator.requestPermission();
    if (permission == LocationPermission.denied ||
        permission == LocationPermission.deniedForever) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Location permission required')),
      );
      return;
    }

    setState(() => _tracking = true);
    _timer = Timer.periodic(const Duration(seconds: 5), (_) async {
      final pos = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high,
      );
      final log = '${DateTime.now().toIso8601String()} — (${pos.latitude}, ${pos.longitude})';
      setState(() => _logs.insert(0, log));
      
      final timestamp = formatCentralTime(DateTime.now());
      await _sendLocationToBackend(pos.latitude, pos.longitude, timestamp);
    });
  }

  String formatCentralTime(DateTime dt) {
    // Central Time offset is UTC-5 or UTC-6 depending on daylight saving
    // Using DateTime.now().toUtc() + Duration(hours: -5) is one option
    // A better way is using timeZoneOffset from a known location
    // For simplicity, let's assume Central Standard Time (UTC-6)

    final centralTime = dt.toUtc().subtract(const Duration(hours: 5));

    // Format as 10.31.25 9:39:08pm
    final formatter = DateFormat('MM.dd.yy h:mm:ss a');
    return formatter.format(centralTime);
  }

   Future<void> _sendLocationToBackend(double lat, double lon, String timestamp) async {
      final url = Uri.parse('http://sam.local:3008/api/location');

      final response = await http.post(
        url,
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({
          'name': "Freddy Krueger",
          'latitude': lat,
          'longitude': lon,
          'timestamp': timestamp,
        }),
      );

      if (response.statusCode != 200) {
        debugPrint('Failed to send location: ${response.statusCode}');
      } else {
        debugPrint('Location sent successfully');
      }
  }

  void _stopTracking() {
    _timer?.cancel();
    setState(() => _tracking = false);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFAEBDFF), // <-- your hex color here
      appBar: AppBar(
        title: const Text('BLOCKCATCHER'),
        backgroundColor: const Color(0xFFAEBDFF), // ✅ your color here
      ),
      body: Column(
        children: [
          const SizedBox(height: 200), // move button closer to top
          Center(
            child: ElevatedButton(
              onPressed: _tracking ? _stopTracking : _startTracking,
              style: ElevatedButton.styleFrom(
                shape: const CircleBorder(),
                padding: const EdgeInsets.all(60),
                backgroundColor: _tracking ? Colors.red : Colors.green,
              ),
              child: Icon(
                _tracking ? Icons.stop : Icons.play_arrow,
                color: Colors.white,
                size: 40,
              ),
            ),
          ),
          const SizedBox(height: 40),
          Expanded(
            child: ListView.builder(
              itemCount: _logs.length,
              itemBuilder: (context, index) => ListTile(
                dense: true,
                title: Text(
                  _logs[index],
                  style: const TextStyle(color: Colors.black87),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}