import 'package:flutter/material.dart';
import 'package:country_state_city_picker/country_state_city_picker.dart';
import 'package:telemednet/controller/patient_controller.dart';

class PatientAddressScreen extends StatefulWidget {
  final PatientController? controller;

  const PatientAddressScreen({super.key, required this.controller});

  @override
  State<PatientAddressScreen> createState() => _PatientAddressScreenState();
}

class _PatientAddressScreenState extends State<PatientAddressScreen> {
  late PatientController _controller;
  late TextEditingController _houseNoController;
  late TextEditingController _lineController;
  late TextEditingController _townController;
  late TextEditingController _pincodeController;
  late TextEditingController _otherLabelController;
  final String country = 'India';
  String? state;
  String? city;
  String? addressType;
  final Map<String, String> _errors = {};
  bool _hasErrors = false;

  @override
  void initState() {
    super.initState();
    _controller = widget.controller ?? PatientController();
    _loadSavedData();
  }

  void _loadSavedData() {
    final address = _controller.model.address;
    _houseNoController = TextEditingController(text: address.houseNo ?? '');
    _lineController = TextEditingController(text: address.line ?? '');
    _townController = TextEditingController(text: address.town ?? '');
    _pincodeController = TextEditingController(text: address.pincode ?? '');
    _otherLabelController =
        TextEditingController(text: address.otherLabel ?? '');
    state = address.state;
    city = address.city;
    addressType = address.addressType;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Address'),
        actions: [
          TextButton(
            onPressed: _saveAndExit,
            child: const Text('Done', style: TextStyle(color: Colors.blue)),
          ),
        ],
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _buildSectionContainer(
              'Address Information',
              Column(
                children: [
                  _buildTextField(
                    'House No.',
                    _houseNoController,
                    (value) => widget.controller!.updateHouseNo(value),
                    icon: Icons.home_outlined,
                    errorKey: 'houseNo',
                  ),
                  _buildTextField(
                    'Address Line',
                    _lineController,
                    (value) => widget.controller!.updateLine(value),
                    icon: Icons.location_on_outlined,
                    errorKey: 'line',
                  ),
                  _buildTextField(
                    'Town (Optional)',
                    _townController,
                    (value) => widget.controller!.updateTown(value),
                    icon: Icons.location_city_outlined,
                  ),
                  _buildTextField(
                    'Pincode',
                    _pincodeController,
                    (value) => widget.controller!.updatePincode(value),
                    icon: Icons.pin_drop_outlined,
                    errorKey: 'pincode',
                  ),
                ],
              ),
            ),
            const SizedBox(height: 20),
            _buildSectionContainer(
              'Location',
              Column(
                children: [
                  _buildCountrySelection(),
                  const SizedBox(height: 10),
                  SelectState(
                    onCountryChanged: (value) {
                      setState(() {});
                      widget.controller!.updateCountry('India');
                    },
                    onStateChanged: (value) {
                      setState(() {
                        state = value;
                      });
                      widget.controller!.updateState(value);
                    },
                    onCityChanged: (value) {
                      setState(() {
                        city = value;
                      });
                      widget.controller!.updateCity(value);
                    },
                  ),
                  const SizedBox(height: 20),
                  if (state != null)
                    Padding(
                      padding: const EdgeInsets.only(bottom: 10),
                      child: Text('State: $state',
                          style: const TextStyle(
                              fontSize: 14, color: Colors.black87)),
                    ),
                  if (city != null)
                    Padding(
                      padding: const EdgeInsets.only(bottom: 10),
                      child: Text('City: $city',
                          style: const TextStyle(
                              fontSize: 14, color: Colors.black87)),
                    ),
                ],
              ),
            ),
            const SizedBox(height: 20),
            _buildSectionContainer(
              'Address Type',
              Column(
                children: [
                  _buildAddressTypeChips(),
                  if (addressType == 'Other')
                    _buildTextField(
                      'Other Label',
                      _otherLabelController,
                      (value) => widget.controller!.updateOtherLabel(value),
                      icon: Icons.label_outline,
                    ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  bool _validateFields() {
    setState(() {
      _errors.clear();
      _hasErrors = false;

      if (_houseNoController.text.trim().isEmpty) {
        _errors['houseNo'] = 'House No. is required';
        _hasErrors = true;
      }

      if (_lineController.text.trim().isEmpty) {
        _errors['line'] = 'Address Line is required';
        _hasErrors = true;
      }

      final pincode = _pincodeController.text.trim();
      if (pincode.isEmpty) {
        _errors['pincode'] = 'Pincode is required';
        _hasErrors = true;
      } else if (!RegExp(r'^\d{6}$').hasMatch(pincode)) {
        _errors['pincode'] = 'Enter a valid 6-digit pincode';
        _hasErrors = true;
      }

      if (state == null || state!.isEmpty) {
        _errors['state'] = 'State is required';
        _hasErrors = true;
      }

      if (city == null || city!.isEmpty) {
        _errors['city'] = 'City is required';
        _hasErrors = true;
      }

      if (addressType == null || addressType!.isEmpty) {
        _errors['addressType'] = 'Please select an address type';
        _hasErrors = true;
      }

      if (addressType == 'Other' && _otherLabelController.text.trim().isEmpty) {
        _errors['otherLabel'] = 'Please specify other label';
        _hasErrors = true;
      }
    });

    return !_hasErrors;
  }

  Widget _buildSectionContainer(String title, Widget content) {
    return Container(
      padding: const EdgeInsets.all(16),
      margin: const EdgeInsets.only(bottom: 16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(10),
        boxShadow: [
          BoxShadow(
            color: Colors.blueGrey.withOpacity(0.5),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            title,
            style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
          ),
          const SizedBox(height: 10),
          content,
        ],
      ),
    );
  }

  Widget _buildTextField(
    String label,
    TextEditingController controller,
    Function(String) onChanged, {
    required IconData icon,
    String? errorKey,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        TextField(
          controller: controller,
          decoration: InputDecoration(
            labelText: label,
            prefixIcon: Icon(icon,
                color: _errors.containsKey(errorKey)
                    ? Colors.red
                    : Colors.blueAccent),
            border: OutlineInputBorder(
              borderRadius: BorderRadius.circular(8),
              borderSide: BorderSide(
                color: _errors.containsKey(errorKey) ? Colors.red : Colors.grey,
              ),
            ),
            enabledBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(8),
              borderSide: BorderSide(
                color: _errors.containsKey(errorKey) ? Colors.red : Colors.grey,
              ),
            ),
            focusedBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(8),
              borderSide: BorderSide(
                color: _errors.containsKey(errorKey)
                    ? Colors.red
                    : Colors.blueAccent,
              ),
            ),
            errorText: _errors[errorKey],
          ),
          onChanged: onChanged,
        ),
        const SizedBox(height: 20),
      ],
    );
  }

  Widget _buildCountrySelection() {
    return Container(
      padding: const EdgeInsets.symmetric(vertical: 8.0),
      child: const Row(
        children: [
          Text(
            'Country:',
            style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
          ),
          SizedBox(width: 8),
          Text('India', style: TextStyle(fontSize: 16)),
        ],
      ),
    );
  }

  Widget _buildAddressTypeChips() {
    return Wrap(
      spacing: 8.0,
      children: ['Home', 'Office', 'Other'].map((String type) {
        return ChoiceChip(
          label: Text(type),
          selected: addressType == type,
          onSelected: (bool selected) {
            setState(() {
              addressType = selected ? type : addressType;
            });
            widget.controller!.updateAddressType(addressType!);
          },
        );
      }).toList(),
    );
  }

  void _saveAndExit() {
    if (_validateFields()) {
      widget.controller!.updateHouseNo(_houseNoController.text);
      widget.controller!.updateLine(_lineController.text);
      widget.controller!.updateTown(_townController.text);
      widget.controller!.updatePincode(_pincodeController.text);
      widget.controller!.updateCountry(country);
      widget.controller!.updateState(state ?? '');
      widget.controller!.updateCity(city ?? '');
      widget.controller!.updateAddressType(addressType ?? '');
      widget.controller!.updateOtherLabel(_otherLabelController.text);
      widget.controller!.updatePatientData();
      Navigator.pop(context, true);
    } else {
      showDialog(
        context: context,
        builder: (context) => AlertDialog(
          title: const Row(
            children: [
              Icon(Icons.error_outline, color: Colors.red),
              SizedBox(width: 8),
              Text('Validation Errors'),
            ],
          ),
          content: SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: _errors.entries
                  .map((error) => Padding(
                        padding: const EdgeInsets.symmetric(vertical: 4),
                        child: Text(
                          '• ${error.value}',
                          style: const TextStyle(color: Colors.red),
                        ),
                      ))
                  .toList(),
            ),
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(context),
              child: const Text('OK'),
            ),
          ],
        ),
      );
    }
  }

  @override
  void dispose() {
    _houseNoController.dispose();
    _lineController.dispose();
    _townController.dispose();
    _pincodeController.dispose();
    _otherLabelController.dispose();
    super.dispose();
  }
}