import 'package:flutter/material.dart';
import 'package:medora/controllers/doctor_controller.dart';

import '../../../route/route_names.dart';

class AchievementsScreen extends StatefulWidget {
  final DoctorController controller;

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

  @override
  State<AchievementsScreen> createState() => _AchievementsScreenState();
}

class _AchievementsScreenState extends State<AchievementsScreen> {
  final _formKey = GlobalKey<FormState>();
  late DoctorController _controller;
  late TextEditingController _achievementController;
  late List<String> achievements;
  bool _isEditing = false;

  @override
  void initState() {
    super.initState();
    _controller = widget.controller;
    _controller.model.achievements ??= [];
    _achievementController = TextEditingController();
    achievements = List<String>.from(_controller.model.achievements ?? []);

    // if (achievements.isNotEmpty) {
    //   _achievementController.text = achievements.join(', ');
    // }
    // _achievementController.addListener(_onFieldChanged);
  }

  void _onFieldChanged() {
    setState(() {
      _isEditing = _achievementController.text.isNotEmpty;
    });
  }

  bool _validateAchievement(String value) {
    if (value.isEmpty) {
      _showError('Please enter an achievement');
      return false;
    }

    if (achievements.any((a) => a.toLowerCase() == value.toLowerCase())) {
      _showError('This achievement has already been added');
      return false;
    }

    if (value.length < 3) {
      _showError('Achievement must be at least 3 characters long');
      return false;
    }
    if (!RegExp(r'^[a-zA-Z0-9\s.,]+$').hasMatch(value)) {
      _showError('Please enter valid achievement text');
      return false;
    }

    return true;
  }

  void _addAchievement() {
    if (_formKey.currentState!.validate()) {
      final achievement = _achievementController.text.trim();
      if (_validateAchievement(achievement)) {
        setState(() {
          achievements.add(achievement);
          _isEditing = true;
        });
        _controller.updateAchievements(List<String>.from(achievements));
        _achievementController.clear();
      }
    }
  }

  void _removeAchievement(int index) {
    setState(() {
      achievements.removeAt(index);
      _isEditing = true;
    });
    _controller.updateAchievements(List<String>.from(achievements));
  }

  void _showError(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        backgroundColor: Colors.red,
        behavior: SnackBarBehavior.floating,
      ),
    );
  }

  bool _validateBeforeNextPage() {
    if (achievements.isEmpty) {
      _showError('Please add at least one achievement');
      return false;
    }
    return true;
  }

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
        onWillPop: () async {
          if (_isEditing) {
            final shouldPop = await showDialog<bool>(
              context: context,
              builder: (context) => AlertDialog(
                title: const Text('Discard Changes?'),
                content: const Text(
                    'You have unsaved changes. Are you sure you want to go back?'),
                actions: [
                  TextButton(
                    onPressed: () => Navigator.pop(context, false),
                    child: const Text('CANCEL'),
                  ),
                  TextButton(
                    onPressed: () => Navigator.pop(context, true),
                    child: const Text('DISCARD'),
                  ),
                ],
              ),
            );
            return shouldPop ?? false;
          }
          return true;
        },
        child: Scaffold(
          appBar: AppBar(
            actions: [
              IconButton(
                  onPressed: () {
                    if (_validateBeforeNextPage()) {
                      Navigator.pushNamed(
                          context, RouteNames.digitalSignatureScreeen,
                          arguments: _controller);
                    }
                  },
                  icon: const Icon(Icons.arrow_forward)),
            ],
            title: const Text('Achievements'),
          ),
          body: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Padding(
                  padding: EdgeInsets.all(16.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'Add Your Achievements',
                        style: TextStyle(
                          fontSize: 20,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(height: 8),
                Container(
                  margin:
                      const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(12),
                    boxShadow: [
                      BoxShadow(
                        color: Colors.blueGrey.withOpacity(0.5),
                        blurRadius: 10,
                        offset: const Offset(0, 2),
                      ),
                    ],
                  ),
                  child: Padding(
                    padding: const EdgeInsets.all(12.0),
                    child: TextFormField(
                      controller: _achievementController,
                      autovalidateMode: AutovalidateMode.onUserInteraction,
                      decoration: InputDecoration(
                        hintText: 'Enter your achievement',
                        labelText: 'Achievement',
                        filled: true,
                        fillColor: Colors.grey[100],
                        suffixIcon: IconButton(
                          icon: const Icon(Icons.add_circle_outline,
                              color: Colors.blue),
                          onPressed: _addAchievement,
                        ),
                        enabledBorder: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                          borderSide:
                              BorderSide(color: Colors.grey.shade300, width: 1),
                        ),
                        focusedBorder: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                          borderSide:
                              const BorderSide(color: Colors.blue, width: 1.5),
                        ),
                        errorBorder: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                          borderSide:
                              const BorderSide(color: Colors.red, width: 1.5),
                        ),
                        focusedErrorBorder: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                          borderSide:
                              const BorderSide(color: Colors.red, width: 1.5),
                        ),
                        helperText: achievements.isEmpty
                            ? 'Minimum 3 characters required'
                            : null,
                      ),
                      validator: (value) {
                        if (achievements.isEmpty) {
                          if (value == null || value.isEmpty) {
                            return 'Please enter an achievement';
                          }
                          if (value.length < 3) {
                            return 'Achievement must be at least 3 characters long';
                          }
                        }
                        if (value != null &&
                            value.isNotEmpty &&
                            achievements.any((a) =>
                                a.toLowerCase() == value.toLowerCase())) {
                          return 'This achievement has already been added';
                        }
                        return null;
                      },
                      onFieldSubmitted: (_) => _addAchievement(),
                    ),
                  ),
                ),
                Expanded(
                  child: ListView.builder(
                    itemCount: achievements.length,
                    padding: const EdgeInsets.all(16),
                    itemBuilder: (context, index) {
                      return Card(
                        elevation: 2,
                        margin: const EdgeInsets.only(bottom: 8),
                        child: ListTile(
                          leading: CircleAvatar(
                            backgroundColor: const Color(0xFF5BC0DE),
                            child: Text('${index + 1}'),
                          ),
                          title: Text(achievements[index]),
                          trailing: IconButton(
                            icon: const Icon(Icons.delete, color: Colors.red),
                            onPressed: () => _removeAchievement(index),
                          ),
                        ),
                      );
                    },
                  ),
                ),
              ],
            ),
          ),
        ));
  }

  @override
  void dispose() {
    _achievementController.removeListener(_onFieldChanged);
    _achievementController.dispose();
    super.dispose();
  }
}