import 'package:flutter/material.dart';
import '../models/udp_package.dart';

class PackageDialog extends StatefulWidget {
  final UdpPackage? package;
  final Function(UdpPackage) onSave;

  const PackageDialog({
    super.key,
    this.package,
    required this.onSave,
  });

  @override
  State<PackageDialog> createState() => _PackageDialogState();
}

class _PackageDialogState extends State<PackageDialog> {
  late TextEditingController _nameController;
  late TextEditingController _ipController;
  late TextEditingController _dataController;
  final _formKey = GlobalKey<FormState>();

  @override
  void initState() {
    super.initState();
    _nameController = TextEditingController(text: widget.package?.name ?? '');
    _ipController = TextEditingController(
      text: widget.package?.ipAddress ?? '127.0.0.1',
    );
    _dataController = TextEditingController(text: widget.package?.data ?? '');
  }

  @override
  void dispose() {
    _nameController.dispose();
    _ipController.dispose();
    _dataController.dispose();
    super.dispose();
  }

  bool _isValidIp(String ip) {
    final parts = ip.split('.');
    if (parts.length != 4) return false;
    for (final part in parts) {
      final num = int.tryParse(part);
      if (num == null || num < 0 || num > 255) return false;
    }
    return true;
  }

  void _save() {
    if (_formKey.currentState!.validate()) {
      final package = UdpPackage(
        id: widget.package?.id ?? DateTime.now().millisecondsSinceEpoch.toString(),
        name: _nameController.text.trim(),
        ipAddress: _ipController.text.trim(),
        data: _dataController.text,
      );
      widget.onSave(package);
      Navigator.pop(context);
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(widget.package == null ? 'New Package' : 'Edit Package'),
      content: SingleChildScrollView(
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextFormField(
                controller: _nameController,
                decoration: const InputDecoration(
                  labelText: 'Package Name',
                  prefixIcon: Icon(Icons.label),
                ),
                validator: (value) {
                  if (value == null || value.trim().isEmpty) {
                    return 'Please enter a package name';
                  }
                  return null;
                },
                autofocus: true,
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _ipController,
                decoration: const InputDecoration(
                  labelText: 'IP Address',
                  prefixIcon: Icon(Icons.computer),
                  hintText: '192.168.1.100',
                ),
                keyboardType: TextInputType.number,
                validator: (value) {
                  if (value == null || value.trim().isEmpty) {
                    return 'Please enter an IP address';
                  }
                  if (!_isValidIp(value.trim())) {
                    return 'Invalid IP address';
                  }
                  return null;
                },
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _dataController,
                decoration: const InputDecoration(
                  labelText: 'Data',
                  prefixIcon: Icon(Icons.data_object),
                  hintText: 'Enter the data to send',
                ),
                maxLines: 4,
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'Please enter data to send';
                  }
                  return null;
                },
              ),
            ],
          ),
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.pop(context),
          child: const Text('Cancel'),
        ),
        FilledButton(
          onPressed: _save,
          child: const Text('Save'),
        ),
      ],
    );
  }
}