import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_appauth/flutter_appauth.dart';

import '../config/intra_config.dart';
import '../services/intra_auth_service.dart';

/// Écran temporaire étape 2 : valider OAuth + token unique (/v2/me).
class AuthScreen extends StatefulWidget {
  const AuthScreen({super.key});

  @override
  State<AuthScreen> createState() => _AuthScreenState();
}

class _AuthScreenState extends State<AuthScreen> {
  final _auth = IntraAuthService.instance;

  bool _loading = false;
  String? _error;
  String? _login;

  Future<void> _connect() async {
    setState(() {
      _loading = true;
      _error = null;
      _login = null;
    });

    try {
      await _auth.signIn();
      final me = await _auth.fetchMe();
      if (!mounted) return;
      setState(() {
        _login = me['login'] as String?;
        _error = null;
      });
    } on FlutterAppAuthUserCancelledException {
      if (!mounted) return;
      setState(() => _error = 'Connexion annulée');
    } on FlutterAppAuthPlatformException catch (e) {
      final d = e.platformErrorDetails;
      if (!mounted) return;
      setState(() {
        _error = d.errorDescription ??
            d.error ??
            d.errorDebugDescription ??
            e.message ??
            'Échec OAuth (UID, SECRET, redirect Intra)';
      });
    } on PlatformException catch (e) {
      if (!mounted) return;
      setState(() => _error = e.message ?? 'Erreur OAuth');
    } catch (e) {
      if (!mounted) return;
      setState(() => _error = e.toString());
    } finally {
      if (mounted) {
        setState(() => _loading = false);
      }
    }
  }

  void _disconnect() {
    _auth.signOut();
    setState(() => _login = null);
  }

  @override
  Widget build(BuildContext context) {
    if (!IntraConfig.isConfigured) {
      return Scaffold(
        appBar: AppBar(title: const Text('Swifty Companion')),
        body: const Padding(
          padding: EdgeInsets.all(24),
          child: Text(
            'Fichier .env manquant ou incomplet.\n'
            'Copie swiftyCompanion/.env vers swifty_companion/.env '
            '(CLIENT_ID, CLIENT_SECRET, REDIRECT_URI).',
          ),
        ),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text('Swifty Companion'),
        backgroundColor: const Color(0xFF00BABC),
        foregroundColor: Colors.black,
      ),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const Text(
              'Étape 2 — Connexion API 42',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 8),
            Text(
              _auth.isAuthenticated
                  ? 'Token actif (réutilisé pour /v2/me)'
                  : 'Connecte-toi une fois ; le token servira pour toutes les requêtes.',
            ),
            const SizedBox(height: 24),
            if (_login != null) ...[
              Text('Connecté : $_login', style: const TextStyle(fontSize: 16)),
              const SizedBox(height: 16),
              OutlinedButton(onPressed: _disconnect, child: const Text('Déconnexion')),
            ] else
              FilledButton(
                onPressed: _loading ? null : _connect,
                child: _loading
                    ? const SizedBox(
                        height: 20,
                        width: 20,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    : const Text('Se connecter avec 42'),
              ),
            if (_error != null) ...[
              const SizedBox(height: 16),
              Text(_error!, style: TextStyle(color: Theme.of(context).colorScheme.error)),
            ],
            const Spacer(),
            Text(
              'Config (.env dans swifty_companion/)\n'
              'Redirect : ${IntraConfig.redirectUri}\n'
              'CLIENT_ID …${IntraConfig.clientIdSuffix}\n'
              'Après modification du .env : arrêter l’app puis flutter run (pas hot reload).',
              style: Theme.of(context).textTheme.bodySmall,
            ),
          ],
        ),
      ),
    );
  }
}