Base-QR-FlutterApp/lib/screens/home_screen.dart

import 'package:flutter/material.dart';
import 'package:qrscanner/models/auth_session.dart';
import 'package:qrscanner/screens/login_screen.dart';
import 'package:qrscanner/screens/scanner_screen.dart';
import 'package:qrscanner/services/auth_service.dart';
import 'package:qrscanner/theme/app_theme.dart';

class HomeScreen extends StatelessWidget {
  const HomeScreen({
    super.key,
    required this.session,
  });

  final AuthSession session;

  Future<void> _logout(BuildContext context) async {
    await AuthService().clearSession();

    if (!context.mounted) return;

    Navigator.of(context).pushReplacement(
      PageRouteBuilder<void>(
        pageBuilder: (context, animation, secondaryAnimation) =>
            const LoginScreen(),
        transitionsBuilder: (context, animation, secondaryAnimation, child) {
          return FadeTransition(opacity: animation, child: child);
        },
        transitionDuration: const Duration(milliseconds: 400),
      ),
    );
  }

  void _openScanner(BuildContext context) {
    Navigator.of(context).push(
      PageRouteBuilder<void>(
        pageBuilder: (context, animation, secondaryAnimation) =>
            ScannerScreen(session: session),
        transitionsBuilder: (context, animation, secondaryAnimation, child) {
          return FadeTransition(
            opacity: animation,
            child: SlideTransition(
              position: Tween<Offset>(
                begin: const Offset(0, 0.06),
                end: Offset.zero,
              ).animate(CurvedAnimation(
                parent: animation,
                curve: Curves.easeOutCubic,
              )),
              child: child,
            ),
          );
        },
        transitionDuration: const Duration(milliseconds: 380),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final expiresHours = (session.expiresIn / 3600).round();

    return Scaffold(
      body: Stack(
        children: [
          Container(
            decoration: const BoxDecoration(
              gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [
                  AppTheme.backgroundDark,
                  Color(0xFF0D1B2A),
                  Color(0xFF12182B),
                ],
              ),
            ),
          ),
          Positioned(
            top: -60,
            right: -40,
            child: Container(
              width: 220,
              height: 220,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                gradient: RadialGradient(
                  colors: [
                    AppTheme.primary.withValues(alpha: 0.12),
                    Colors.transparent,
                  ],
                ),
              ),
            ),
          ),
          SafeArea(
            child: Column(
              children: [
                Padding(
                  padding: const EdgeInsets.fromLTRB(8, 8, 8, 0),
                  child: Row(
                    children: [
                      const Spacer(),
                      IconButton(
                        icon: const Icon(Icons.logout_rounded),
                        tooltip: 'Cerrar sesión',
                        onPressed: () => _logout(context),
                      ),
                    ],
                  ),
                ),
                Expanded(
                  child: Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 32),
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Container(
                          width: 110,
                          height: 110,
                          decoration: BoxDecoration(
                            borderRadius: BorderRadius.circular(28),
                            gradient: const LinearGradient(
                              begin: Alignment.topLeft,
                              end: Alignment.bottomRight,
                              colors: [AppTheme.primary, AppTheme.primaryDark],
                            ),
                            boxShadow: [
                              BoxShadow(
                                color: AppTheme.primary.withValues(alpha: 0.35),
                                blurRadius: 28,
                                offset: const Offset(0, 10),
                              ),
                            ],
                          ),
                          child: const Icon(
                            Icons.qr_code_scanner_rounded,
                            size: 52,
                            color: Colors.white,
                          ),
                        ),
                        const SizedBox(height: 28),
                        Text(
                          'Hola, ${session.username}',
                          style:
                              Theme.of(context).textTheme.headlineSmall?.copyWith(
                                    fontWeight: FontWeight.bold,
                                  ),
                        ),
                        const SizedBox(height: 10),
                        Text(
                          'Listo para validar pases',
                          style:
                              Theme.of(context).textTheme.bodyLarge?.copyWith(
                                    color: Colors.white.withValues(alpha: 0.55),
                                  ),
                        ),
                        const SizedBox(height: 8),
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 14,
                            vertical: 8,
                          ),
                          decoration: BoxDecoration(
                            color: Colors.white.withValues(alpha: 0.06),
                            borderRadius: BorderRadius.circular(20),
                            border: Border.all(
                              color: Colors.white.withValues(alpha: 0.08),
                            ),
                          ),
                          child: Text(
                            'Sesión activa · $expiresHours h',
                            style: TextStyle(
                              color: Colors.white.withValues(alpha: 0.45),
                              fontSize: 13,
                            ),
                          ),
                        ),
                        const SizedBox(height: 48),
                        _ScanButton(onPressed: () => _openScanner(context)),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class _ScanButton extends StatefulWidget {
  const _ScanButton({required this.onPressed});

  final VoidCallback onPressed;

  @override
  State<_ScanButton> createState() => _ScanButtonState();
}

class _ScanButtonState extends State<_ScanButton>
    with SingleTickerProviderStateMixin {
  late final AnimationController _controller;
  late final Animation<double> _glow;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1800),
    )..repeat(reverse: true);
    _glow = Tween<double>(begin: 0.18, end: 0.38).animate(
      CurvedAnimation(parent: _controller, curve: Curves.easeInOut),
    );
  }

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

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _glow,
      builder: (context, child) {
        return Container(
          width: double.infinity,
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(20),
            boxShadow: [
              BoxShadow(
                color: AppTheme.primary.withValues(alpha: _glow.value),
                blurRadius: 28,
                offset: const Offset(0, 10),
              ),
            ],
          ),
          child: child,
        );
      },
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: widget.onPressed,
          borderRadius: BorderRadius.circular(20),
          child: Ink(
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(20),
              gradient: const LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [AppTheme.primary, AppTheme.primaryDark],
              ),
            ),
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 20, horizontal: 24),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Container(
                    width: 44,
                    height: 44,
                    decoration: BoxDecoration(
                      color: Colors.white.withValues(alpha: 0.18),
                      borderRadius: BorderRadius.circular(12),
                    ),
                    child: const Icon(
                      Icons.qr_code_scanner_rounded,
                      color: Colors.white,
                      size: 26,
                    ),
                  ),
                  const SizedBox(width: 16),
                  const Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'Abrir escáner',
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 18,
                          fontWeight: FontWeight.w700,
                        ),
                      ),
                      Text(
                        'Validar código de pase',
                        style: TextStyle(
                          color: Color(0xCCFFFFFF),
                          fontSize: 13,
                        ),
                      ),
                    ],
                  ),
                  const Spacer(),
                  const Icon(
                    Icons.arrow_forward_rounded,
                    color: Colors.white,
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}