import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../utils/frequency_input_formatter.dart';

class EditClearancePage extends StatefulWidget {
  final String clearanceLimit;
  final String route;
  final String altitude;
  final String squawk;
  final String frequency;
  final bool isDarkMode;
  final Function toggleDarkMode;

  const EditClearancePage({super.key,
    required this.clearanceLimit,
    required this.route,
    required this.altitude,
    required this.squawk,
    required this.frequency,
    required this.isDarkMode,
    required this.toggleDarkMode,
  });

  @override
  EditClearancePageState createState() => EditClearancePageState();
}

class EditClearancePageState extends State<EditClearancePage> {
  final _formKey = GlobalKey<FormState>();

  late TextEditingController _clearanceLimitController;
  late TextEditingController _routeController;
  late TextEditingController _altitudeController;
  late TextEditingController _squawkController;
  late TextEditingController _frequencyController;

  final FocusNode _altitudeFocusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    _clearanceLimitController = TextEditingController(text: widget.clearanceLimit);
    _routeController = TextEditingController(text: widget.route);
    _altitudeController = TextEditingController(text: widget.altitude);
    _squawkController = TextEditingController(text: widget.squawk);
    _frequencyController = TextEditingController(text: widget.frequency);

    _altitudeFocusNode.addListener(() {
      if (!_altitudeFocusNode.hasFocus) {
        _formatAltitude(_altitudeController);
      }
    });
  }

  @override
  void dispose() {
    _clearanceLimitController.dispose();
    _routeController.dispose();
    _altitudeController.dispose();
    _squawkController.dispose();
    _frequencyController.dispose();
    _altitudeFocusNode.dispose();
    super.dispose();
  }

  void _formatAltitude(TextEditingController controller) {
    String text = controller.text.trim();
    if (text.isEmpty) {
      return;
    }

    if (text.startsWith('FL') || text.endsWith('ft')) {
      return;
    }

    if (RegExp(r'^\d{2,3}$').hasMatch(text)) {
      controller.text = 'FL$text';
    } else if (RegExp(r'^\d{4,}$').hasMatch(text)) {
      controller.text = '$text ft';
    }
  }

  void _submitForm() {
    Navigator.pop(
      context,
      {
        'clearanceLimit': _clearanceLimitController.text,
        'route': _routeController.text,
        'altitude': _altitudeController.text,
        'squawk': _squawkController.text,
        'frequency': _frequencyController.text,
      },
    );
  }

  Widget buildTextField(String label, TextEditingController controller) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 10),
      child: TextFormField(
        controller: controller,
        decoration: InputDecoration(
          labelText: label,
          border: const OutlineInputBorder(),
        ),
      ),
    );
  }

  Widget buildAltitudeField(TextEditingController controller, FocusNode focusNode) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 10),
      child: TextFormField(
        controller: controller,
        focusNode: focusNode,
        keyboardType: TextInputType.number,
        decoration: const InputDecoration(
          labelText: 'Altitude',
          border: OutlineInputBorder(),
        ),
        inputFormatters: [
          FilteringTextInputFormatter.digitsOnly,
        ],
      ),
    );
  }

  Widget buildSquawkField(TextEditingController controller) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 10),
      child: TextFormField(
        controller: controller,
        keyboardType: TextInputType.number,
        decoration: const InputDecoration(
          labelText: 'Transponder (Squawk)',
          border: OutlineInputBorder(),
        ),
        inputFormatters: [
          FilteringTextInputFormatter.allow(RegExp(r'[0-7]')),
          LengthLimitingTextInputFormatter(4),
        ],
      ),
    );
  }

  Widget buildFrequencyField(TextEditingController controller) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 10),
      child: TextFormField(
        controller: controller,
        keyboardType: const TextInputType.numberWithOptions(decimal: true),
        decoration: const InputDecoration(
          labelText: 'Frequency',
          border: OutlineInputBorder(),
        ),
        inputFormatters: [
          FrequencyInputFormatter(),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('IFR Buddy'),
        actions: [
          IconButton(
            icon: Icon(widget.isDarkMode ? Icons.dark_mode : Icons.light_mode),
            onPressed: () {
              widget.toggleDarkMode();
            },
          ),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Card(
          elevation: 4,
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Form(
              key: _formKey,
              child: ListView(
                children: [
                  buildTextField('Clearance Limit', _clearanceLimitController),
                  buildTextField('Route', _routeController),
                  buildAltitudeField(_altitudeController, _altitudeFocusNode),
                  buildSquawkField(_squawkController),
                  buildFrequencyField(_frequencyController),
                  const SizedBox(height: 20),
                  ElevatedButton(
                    onPressed: _submitForm,
                    child: const Text('Submit Edited Clearance'),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}