import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../../core/api/api_error_mapper.dart';
import '../../auth/data/auth_providers.dart';
import '../data/profile_repository.dart';
import '../domain/user_profile.dart';

class ProfileScreen extends ConsumerStatefulWidget {
  const ProfileScreen({super.key});

  @override
  ConsumerState<ProfileScreen> createState() => _ProfileScreenState();
}

class _ProfileScreenState extends ConsumerState<ProfileScreen> {
  final _formKey = GlobalKey<FormState>();
  bool _isLoading = true;
  bool _isSaving = false;
  String? _error;
  UserProfile? _profile;

  late final TextEditingController _emailCtrl;
  late final TextEditingController _firstNameCtrl;
  late final TextEditingController _lastNameCtrl;

  @override
  void initState() {
    super.initState();
    _emailCtrl = TextEditingController();
    _firstNameCtrl = TextEditingController();
    _lastNameCtrl = TextEditingController();
    _loadProfile();
  }

  @override
  void dispose() {
    _emailCtrl.dispose();
    _firstNameCtrl.dispose();
    _lastNameCtrl.dispose();
    super.dispose();
  }

  Future<void> _loadProfile() async {
    setState(() {
      _isLoading = true;
      _error = null;
    });
    try {
      final profile = await ref.read(profileRepositoryProvider).getMe();
      if (!mounted) return;
      setState(() {
        _profile = profile;
        _emailCtrl.text = profile.email;
        _firstNameCtrl.text = profile.firstName ?? '';
        _lastNameCtrl.text = profile.lastName ?? '';
      });
    } catch (e) {
      if (!mounted) return;
      setState(() => _error = mapErrorToUserMessage(e, context));
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  Future<void> _save() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _isSaving = true);
    try {
      final updated = await ref.read(profileRepositoryProvider).updateMe(
            email: _emailCtrl.text.trim(),
            firstName: _firstNameCtrl.text.trim().isEmpty ? null : _firstNameCtrl.text.trim(),
            lastName: _lastNameCtrl.text.trim().isEmpty ? null : _lastNameCtrl.text.trim(),
          );
      if (!mounted) return;
      setState(() => _profile = updated);
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Profil sparad!')),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(mapErrorToUserMessage(e, context))),
      );
    } finally {
      if (mounted) setState(() => _isSaving = false);
    }
  }

  Future<void> _logout() async {
    await ref.read(authStateProvider.notifier).logout();
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Scaffold(
      appBar: AppBar(
        title: const Text('Profil'),
        actions: [], // Utloggningsikonen tas bort här eftersom den redan finns i AppShell
      ),
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : _error != null
              ? Center(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Text(_error!, style: TextStyle(color: theme.colorScheme.error)),
                      const SizedBox(height: 16),
                      FilledButton(onPressed: _loadProfile, child: const Text('Försök igen')),
                    ],
                  ),
                )
              : SingleChildScrollView(
                  padding: const EdgeInsets.all(24),
                  child: Form(
                    key: _formKey,
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        // Read-only username
                        Text('Användarnamn', style: theme.textTheme.labelMedium?.copyWith(color: theme.colorScheme.onSurfaceVariant)),
                        const SizedBox(height: 4),
                        Text(_profile?.username ?? '', style: theme.textTheme.bodyLarge),
                        const Divider(height: 32),
                        // Role badge
                        if (_profile?.isAdmin == true)
                          Chip(
                            label: const Text('Admin'),
                            avatar: const Icon(Icons.shield_outlined, size: 16),
                            backgroundColor: theme.colorScheme.primaryContainer,
                            labelStyle: TextStyle(color: theme.colorScheme.onPrimaryContainer),
                          ),
                        if (_profile?.isAdmin == true) const SizedBox(height: 16),
                        // Editable fields
                        TextFormField(
                          controller: _emailCtrl,
                          decoration: const InputDecoration(
                            labelText: 'E-post',
                            border: OutlineInputBorder(),
                          ),
                          keyboardType: TextInputType.emailAddress,
                          validator: (v) {
                            if (v == null || v.isEmpty) return 'Ange en e-postadress';
                            if (!RegExp(r'^[^@]+@[^@]+\.[^@]+').hasMatch(v)) return 'Ogiltig e-postadress';
                            return null;
                          },
                        ),
                        const SizedBox(height: 16),
                        TextFormField(
                          controller: _firstNameCtrl,
                          decoration: const InputDecoration(
                            labelText: 'Förnamn',
                            border: OutlineInputBorder(),
                          ),
                        ),
                        const SizedBox(height: 16),
                        TextFormField(
                          controller: _lastNameCtrl,
                          decoration: const InputDecoration(
                            labelText: 'Efternamn',
                            border: OutlineInputBorder(),
                          ),
                        ),
                        const SizedBox(height: 32),
                        SizedBox(
                          width: double.infinity,
                          child: FilledButton(
                            onPressed: _isSaving ? null : _save,
                            child: _isSaving
                                ? const SizedBox(
                                    height: 20,
                                    width: 20,
                                    child: CircularProgressIndicator(strokeWidth: 2),
                                  )
                                : const Text('Spara'),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
    );
  }
}