import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:provider/provider.dart';

import 'shared_preferences_provider.dart';

class ProfileScreen extends StatefulWidget {
  final bool isEditing;
  final VoidCallback onClose;

  const ProfileScreen(
      {super.key, required this.isEditing, required this.onClose});

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

class ProfileScreenState extends State<ProfileScreen> {
  final TextEditingController _nameController = TextEditingController();
  late String? imageData;
  bool isNameEmpty = true;
  final ImagePicker _picker = ImagePicker();

  @override
  void initState() {
    super.initState();
    final prefsProvider =
        Provider.of<SharedPreferencesProvider>(context, listen: false);
    _nameController.text = prefsProvider.getUserName();
    imageData = prefsProvider.getUserLogo();

    // Check initial state of the name field and add listener
    _nameController.addListener(_checkNameField);
    isNameEmpty = _nameController.text.trim().isEmpty;
  }

  void _checkNameField() {
    setState(() {
      isNameEmpty = _nameController.text.trim().isEmpty;
    });
  }

  Future<void> _pickImage() async {
    final pickedFile = await _picker.pickImage(source: ImageSource.gallery);
    if (pickedFile != null) {
      late final Uint8List imageBytes;
      if (kIsWeb) {
        imageBytes = await pickedFile.readAsBytes();
      } else {
        imageBytes = await File(pickedFile.path).readAsBytes();
      }
      setState(() {
        if (mounted) {
          final prefsProvider =
              Provider.of<SharedPreferencesProvider>(context, listen: false);
          prefsProvider
              .setUserLogo(base64Encode(imageBytes)); // Cache the image
          imageData = base64Encode(imageBytes);
        }
      });
    }
  }

  void _saveProfile() async {
    String name = _nameController.text.trim();
    if (name.isNotEmpty) {
      final prefsProvider =
          Provider.of<SharedPreferencesProvider>(context, listen: false);
      await prefsProvider.setUserName(name);
      await prefsProvider.setUserLogo(imageData);

      // Close the screen after saving if the name is valid
      widget.onClose();
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Name cannot be empty!')),
      );
      return;
    }
  }

  @override
  void dispose() {
    _nameController.removeListener(_checkNameField);
    _nameController.dispose();
    super.dispose();
  }

  Image getLogoImage(String? logo) {
    if (logo != null) {
      return Image.memory(base64Decode(logo));
    } else {
      return Image.asset('assets/default_logo.png');
    }
  }

  @override
  Widget build(BuildContext context) {
    final prefsProvider = Provider.of<SharedPreferencesProvider>(context);
    final userLogo = prefsProvider.getUserLogo();

    return Center(
      child: Material(
        color: Colors.white,
        borderRadius: BorderRadius.circular(20.0),
        elevation: 10.0,
        child: Container(
          width: MediaQuery.of(context).size.width * 0.8,
          padding: const EdgeInsets.all(16.0),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Align(
                alignment: Alignment.topRight,
                child: IconButton(
                  icon: const Icon(Icons.close),
                  onPressed: isNameEmpty ? null : widget.onClose,
                  color: isNameEmpty ? Colors.grey : Colors.black,
                ),
              ),
              Text(
                widget.isEditing
                    ? 'Edit Your Information'
                    : 'Tell Us About Yourself',
                style: const TextStyle(
                  fontSize: 20,
                  fontWeight: FontWeight.bold,
                ),
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 20),
              CircleAvatar(
                radius: 50,
                backgroundImage: getLogoImage(userLogo).image,
              ),
              const SizedBox(height: 20),
              TextField(
                controller: _nameController,
                decoration: const InputDecoration(
                  labelText: 'Your Pet\'s Name',
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 20),
              ElevatedButton(
                onPressed: _pickImage,
                child: const Text('Upload Profile Image'),
              ),
              const SizedBox(height: 20),
              ElevatedButton(
                onPressed: _saveProfile,
                child: Text(widget.isEditing ? 'Save Changes' : 'Continue'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}