import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:chepuhagram/domain/services/api_service.dart';
import 'package:chepuhagram/logic/auth_provider.dart';

class AccountSettingsScreen extends StatefulWidget {
  const AccountSettingsScreen({super.key});

  @override
  State<AccountSettingsScreen> createState() => _AccountSettingsScreenState();
}

class _AccountSettingsScreenState extends State<AccountSettingsScreen> {
  final _formKey = GlobalKey<FormState>();
  final _usernameController = TextEditingController();
  final _firstNameController = TextEditingController();
  final _lastNameController = TextEditingController();
  final _phoneController = TextEditingController();
  final _emailController = TextEditingController();
  final _aboutController = TextEditingController();
  bool _isSaving = false;

  @override
  void initState() {
    super.initState();
    final auth = context.read<AuthProvider>();
    _usernameController.text = auth.username ?? '';
    _firstNameController.text = auth.firstName ?? '';
    _lastNameController.text = auth.lastName ?? '';
    _phoneController.text = auth.phone ?? '';
    _emailController.text = auth.email ?? '';
    _aboutController.text = auth.about ?? '';
  }

  @override
  void dispose() {
    _usernameController.dispose();
    _firstNameController.dispose();
    _lastNameController.dispose();
    _phoneController.dispose();
    _emailController.dispose();
    _aboutController.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _isSaving = true);
    try {
      final api = ApiService();
      await api.updateMe(
        username: _usernameController.text.trim(),
        firstName: _firstNameController.text.trim(),
        lastName: _lastNameController.text.trim(),
        phone: _phoneController.text,
        email: _emailController.text,
        about: _aboutController.text,
      );

      if (!mounted) return;
      await context.read<AuthProvider>().refreshMe();

      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Сохранено')),
      );
      Navigator.of(context).pop();
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString().replaceAll('Exception: ', ''))),
      );
    } finally {
      if (mounted) setState(() => _isSaving = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Аккаунт'),
        actions: [
          TextButton(
            onPressed: _isSaving ? null : _save,
            child: _isSaving
                ? const SizedBox(
                    width: 16,
                    height: 16,
                    child: CircularProgressIndicator(strokeWidth: 2),
                  )
                : const Text(
                    'Сохранить',
                    style: TextStyle(color: Colors.white),
                  ),
          ),
        ],
      ),
      body: Form(
        key: _formKey,
        child: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            TextFormField(
              controller: _usernameController,
              decoration: const InputDecoration(
                labelText: 'Имя пользователя',
                hintText: 'Латиница, цифры, подчеркивания',
              ),
              validator: (v) {
                if (v == null || v.trim().isEmpty) return 'Введите имя пользователя';
                if (!RegExp(r'^[a-zA-Z0-9_]{3,20}$').hasMatch(v.trim())) {
                  return 'Имя пользователя должно содержать от 3 до 20 символов (латиница, цифры, подчеркивания)';
                }
                return null;
              },
            ),
            const SizedBox(height: 12),
            TextFormField(
              controller: _firstNameController,
              decoration: const InputDecoration(
                labelText: 'Имя',
              ),
              validator: (v) {
                if (v == null || v.trim().isEmpty) return 'Введите имя';
                return null;
              },
            ),
            const SizedBox(height: 12),
            TextFormField(
              controller: _lastNameController,
              decoration: const InputDecoration(
                labelText: 'Фамилия',
              ),
            ),
            const SizedBox(height: 12),
            TextFormField(
              controller: _phoneController,
              decoration: const InputDecoration(
                labelText: 'Телефон',
              ),
              keyboardType: TextInputType.phone,
            ),
            const SizedBox(height: 12),
            TextFormField(
              controller: _emailController,
              decoration: const InputDecoration(
                labelText: 'Почта',
              ),
              keyboardType: TextInputType.emailAddress,
            ),
            const SizedBox(height: 12),
            TextFormField(
              controller: _aboutController,
              decoration: const InputDecoration(
                labelText: 'О себе',
              ),
              minLines: 2,
              maxLines: 5,
            ),
          ],
        ),
      ),
    );
  }
}