import 'package:flutter/foundation.dart';
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_api_exception.dart';
import '../services/intra_auth_service.dart';
import '../services/intra_user_service.dart';
import '../theme/swifty_ui.dart';
import 'profile_screen.dart';

/// Vue 1 — recherche par login 42.
class SearchScreen extends StatefulWidget {
  const SearchScreen({super.key});

  @override
  State<SearchScreen> createState() => _SearchScreenState();
}

class _SearchScreenState extends State<SearchScreen> {
  final _auth = IntraAuthService.instance;
  final _users = IntraUserService.instance;
  final _loginController = TextEditingController();

  bool _connecting = false;
  bool _searching = false;
  String? _error;
  String? _sessionLogin;

  @override
  void dispose() {
    _loginController.dispose();
    super.dispose();
  }

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

    try {
      await _auth.signIn();
      final me = await _auth.fetchMe();
      if (!mounted) return;
      setState(() {
        _sessionLogin = me['login'] as String?;
      });
    } 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';
      });
    } 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(() => _connecting = false);
    }
  }

  void _disconnect() {
    _auth.signOut();
    setState(() {
      _sessionLogin = null;
      _error = null;
    });
  }

  Future<void> _search() async {
    setState(() {
      _searching = true;
      _error = null;
    });

    try {
      final user = await _users.fetchUserByLogin(_loginController.text);
      if (!mounted) return;
      await Navigator.of(context).push<void>(
        MaterialPageRoute(
          builder: (_) => ProfileScreen(user: user),
        ),
      );
    } on IntraApiException catch (e) {
      if (!mounted) return;
      setState(() => _error = e.message);
    } catch (e) {
      if (!mounted) return;
      setState(() => _error = e.toString());
    } finally {
      if (mounted) setState(() => _searching = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    if (!IntraConfig.isConfigured) {
      return Scaffold(
        appBar: SwiftyUi.appBar(title: 'Swifty Companion'),
        body: const ResponsiveScrollBody(
          maxWidth: SwiftyUi.searchMaxWidth,
          child: Text(
            'Fichier .env manquant dans swifty_companion/.env',
          ),
        ),
      );
    }

    final isAuthenticated = _auth.isAuthenticated;
    final busy = _connecting || _searching;

    return Scaffold(
      appBar: SwiftyUi.appBar(
        title: 'Swifty Companion',
        actions: [
          if (isAuthenticated)
            IconButton(
              onPressed: busy ? null : _disconnect,
              icon: const Icon(Icons.logout),
              tooltip: 'Déconnexion API',
            ),
        ],
      ),
      body: ResponsiveScrollBody(
        maxWidth: SwiftyUi.searchMaxWidth,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            if (!isAuthenticated) ...[
              Text(
                'Connexion API 42',
                style: Theme.of(context).textTheme.titleLarge,
              ),
              const SizedBox(height: 8),
              Text(
                'Connecte-toi une fois ; le token servira pour toutes les recherches.',
                style: Theme.of(context).textTheme.bodyMedium,
              ),
              const SizedBox(height: 20),
              LoadingFilledButton(
                label: 'Se connecter avec 42',
                loading: _connecting,
                onPressed: _connect,
              ),
            ] else ...[
              Text(
                'Session : ${_sessionLogin ?? 'connecté'}',
                style: Theme.of(context).textTheme.titleMedium,
              ),
              const SizedBox(height: 28),
              Text(
                'Rechercher un étudiant',
                style: Theme.of(context).textTheme.titleLarge,
              ),
              const SizedBox(height: 12),
              TextField(
                controller: _loginController,
                decoration: const InputDecoration(
                  labelText: 'Login 42',
                  hintText: 'ex. fgras-ca',
                  border: OutlineInputBorder(),
                ),
                textInputAction: TextInputAction.search,
                autocorrect: false,
                enableSuggestions: false,
                onSubmitted: (_) {
                  if (!_searching) _search();
                },
                enabled: !_searching,
              ),
              const SizedBox(height: 16),
              LoadingFilledButton(
                label: 'Rechercher',
                loading: _searching,
                onPressed: _search,
              ),
              if (kDebugMode) ...[
                const SizedBox(height: 12),
                TextButton(
                  onPressed: _auth.canRefresh
                      ? () {
                          _auth.debugInvalidateAccessToken();
                          setState(() {
                            _error =
                                'DEBUG : access token invalidé (refresh conservé). '
                                'Étape suivante : saisis un login et appuie sur « Rechercher ». '
                                'Si le bonus marche, le profil s’ouvre sans repasser par OAuth 42.';
                          });
                        }
                      : null,
                  child: const Text('DEBUG : simuler token expiré'),
                ),
              ],
            ],
            if (_error != null) ...[
              const SizedBox(height: 20),
              ErrorMessage(message: _error!),
            ],
          ],
        ),
      ),
    );
  }
}