import 'package:flutter/material.dart';
import 'package:supabase_flutter/supabase_flutter.dart';

import '../services/session_client.dart';
import '../supabase_config.dart';
import 'complete_profile_screen.dart';
import 'home_client_screen.dart';
import 'welcome_screen.dart';

/// Aiguille entre l'accueil non connecté, la finalisation de profil et l'app.
class AuthGate extends StatelessWidget {
  const AuthGate({super.key});

  @override
  Widget build(BuildContext context) {
    if (!SupabaseConfig.estConfigure) return const _EcranNonConfigure();

    return StreamBuilder<AuthState>(
      stream: supabase.auth.onAuthStateChange,
      builder: (context, snapshot) {
        final session = supabase.auth.currentSession;
        if (session == null) return const WelcomeScreen();
        return _SessionChargee(key: ValueKey(session.user.id));
      },
    );
  }
}

/// Charge les données du client connecté, puis affiche l'app (ou la
/// finalisation de profil si le compte n'a pas encore de fiche fidélité).
class _SessionChargee extends StatefulWidget {
  const _SessionChargee({super.key});

  @override
  State<_SessionChargee> createState() => _SessionChargeeState();
}

class _SessionChargeeState extends State<_SessionChargee> {
  late Future<void> _chargement;

  @override
  void initState() {
    super.initState();
    _chargement = SessionClient.instance.charger();
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<void>(
      future: _chargement,
      builder: (context, snapshot) {
        if (snapshot.connectionState != ConnectionState.done) {
          return const Scaffold(
            body: Center(child: CircularProgressIndicator()),
          );
        }
        return AnimatedBuilder(
          animation: SessionClient.instance,
          builder: (context, _) {
            final aProfil = SessionClient.instance.monClient != null;
            return aProfil
                ? const HomeClientScreen()
                : const CompleteProfileScreen();
          },
        );
      },
    );
  }
}

class _EcranNonConfigure extends StatelessWidget {
  const _EcranNonConfigure();

  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(
        child: Padding(
          padding: EdgeInsets.all(32),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Icon(Icons.cloud_off, size: 56, color: Colors.grey),
              SizedBox(height: 16),
              Text('Supabase non configuré',
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700)),
              SizedBox(height: 8),
              Text(
                'Renseignez l\'URL et la clé anon dans lib/supabase_config.dart.',
                textAlign: TextAlign.center,
                style: TextStyle(color: Color(0xFF6B6B72)),
              ),
            ],
          ),
        ),
      ),
    );
  }
}