import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:pad_scanner/services/api_service.dart';

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

  @override
  State<SettingsPage> createState() => _SettingsPageState();
}

class _SettingsPageState extends State<SettingsPage> {
  final _controller = TextEditingController();
  final _apiService = ApiService();
  bool _saving = false;

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

  Future<void> _loadUrl() async {
    final prefs = await SharedPreferences.getInstance();
    _controller.text = prefs.getString('api_url') ?? '';
  }

  Future<void> _saveUrl() async {
    setState(() => _saving = true);
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('api_url', _controller.text.trim());
    setState(() => _saving = false);
    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('URL saved')),
      );
    }
  }

  Future<void> _testConnection() async {
    final url = _controller.text.trim();
    if (url.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Please enter a URL first')),
      );
      return;
    }
    final ok = await _apiService.sendScanData(
      url,
      barcode: 'TEST_BARCODE',
      codeType: 'TEST',
    );
    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(ok ? 'Connection OK' : 'Connection failed')),
      );
    }
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Settings')),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            TextField(
              controller: _controller,
              decoration: const InputDecoration(
                labelText: 'API URL',
                hintText: 'http://192.168.1.100:8000/scan',
                border: OutlineInputBorder(),
              ),
              keyboardType: TextInputType.url,
            ),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: _saving ? null : _saveUrl,
              child: _saving
                  ? const SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(strokeWidth: 2))
                  : const Text('Save'),
            ),
            const SizedBox(height: 8),
            OutlinedButton(
              onPressed: _testConnection,
              child: const Text('Test Connection'),
            ),
          ],
        ),
      ),
    );
  }
}