import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import '../../../core/router/app_router.dart';
import '../../../core/time/server_time.dart';
import '../../../core/theme/app_colors.dart';
import '../../../core/widgets/empty_state.dart';
import '../../../core/widgets/screen_header.dart';
import '../data/booking_repository.dart';
import '../domain/booking.dart';

/// Écran listant les réservations avec annulation et modification.
class BookingsScreen extends ConsumerWidget {
  const BookingsScreen({super.key});

  Future<void> _cancelBooking(BuildContext context, WidgetRef ref, Booking booking) async {
    final slotLabel = booking.slotStart != null
        ? ServerTime.format(booking.slotStart, pattern: 'EEEE dd MMM à HH:mm')
        : 'ce créneau';

    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Annuler la réservation ?'),
        content: Text(
          'Le créneau du $slotLabel sera libéré.\n\n'
          'Annulation gratuite plus de 2 h avant le créneau, sinon des frais peuvent s\'appliquer.',
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('Non')),
          TextButton(
            onPressed: () => Navigator.pop(ctx, true),
            style: TextButton.styleFrom(foregroundColor: AppColors.error),
            child: const Text('Oui, annuler'),
          ),
        ],
      ),
    );

    if (confirmed != true || !context.mounted) return;

    try {
      await ref.read(bookingRepositoryProvider).cancelBooking(booking.uuid);
      ref.invalidate(bookingsProvider);
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('Réservation annulée'),
            backgroundColor: AppColors.success,
          ),
        );
      }
    } on BookingException catch (e) {
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(e.message), backgroundColor: AppColors.error),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final bookingsAsync = ref.watch(bookingsProvider);

    return bookingsAsync.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (error, _) => EmptyState(
        icon: Icons.event_busy_outlined,
        title: 'Erreur',
        subtitle: 'Impossible de charger vos réservations.',
        actionLabel: 'Réessayer',
        onAction: () => ref.invalidate(bookingsProvider),
      ),
      data: (bookings) {
        if (bookings.isEmpty) {
          return EmptyState(
            icon: Icons.event_outlined,
            title: 'Aucune réservation',
            subtitle: 'Réservez un créneau jusqu\'à 6 jours\nà l\'avance depuis une laverie.',
            actionLabel: 'Voir les laveries',
            onAction: () => context.go(AppRoutes.home),
          );
        }

        final upcoming = bookings
            .where((b) => b.status != 'cancelled' && b.status != 'completed' && b.status != 'no_show')
            .toList();
        final past = bookings
            .where((b) => b.status == 'cancelled' || b.status == 'completed' || b.status == 'no_show')
            .toList();

        return RefreshIndicator(
          onRefresh: () async => ref.invalidate(bookingsProvider),
          child: ListView(
            padding: const EdgeInsets.fromLTRB(16, 8, 16, 88),
            children: [
              const ScreenHeader(
                title: 'Mes créneaux',
                subtitle: '30 min pour démarrer après notification',
              ),
              if (upcoming.isNotEmpty) ...[
                Text('À venir', style: Theme.of(context).textTheme.titleMedium),
                const SizedBox(height: 8),
                ...upcoming.map(
                  (b) => _BookingCard(
                    booking: b,
                    highlight: true,
                    onModify: b.canModify
                        ? () => context.push(AppRoutes.bookingModify(b.uuid))
                        : null,
                    onCancel: b.canCancel ? () => _cancelBooking(context, ref, b) : null,
                  ),
                ),
                const SizedBox(height: 16),
              ],
              if (past.isNotEmpty) ...[
                Text('Passées', style: Theme.of(context).textTheme.titleMedium),
                const SizedBox(height: 8),
                ...past.map((b) => _BookingCard(booking: b, highlight: false)),
              ],
            ],
          ),
        );
      },
    );
  }
}

class _BookingCard extends StatelessWidget {
  const _BookingCard({
    required this.booking,
    required this.highlight,
    this.onModify,
    this.onCancel,
  });

  final Booking booking;
  final bool highlight;
  final VoidCallback? onModify;
  final VoidCallback? onCancel;

  @override
  Widget build(BuildContext context) {
    final slotText = booking.slotStart != null
        ? ServerTime.format(booking.slotStart, pattern: 'EEEE dd MMM · HH:mm')
        : 'Créneau à confirmer';

    return Card(
      margin: const EdgeInsets.only(bottom: 8),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(14),
        side: highlight
            ? BorderSide(color: AppColors.machineReserved.withValues(alpha: 0.4))
            : BorderSide.none,
      ),
      child: Padding(
        padding: const EdgeInsets.all(14),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Container(
                  width: 48,
                  height: 48,
                  decoration: BoxDecoration(
                    color: (highlight ? AppColors.machineReserved : AppColors.textSecondary)
                        .withValues(alpha: 0.1),
                    borderRadius: BorderRadius.circular(12),
                  ),
                  child: Icon(
                    Icons.event,
                    color: highlight ? AppColors.machineReserved : AppColors.textSecondary,
                  ),
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(booking.machineName, style: Theme.of(context).textTheme.titleMedium),
                      const SizedBox(height: 2),
                      Text(slotText, style: Theme.of(context).textTheme.bodyMedium),
                    ],
                  ),
                ),
                StatusBadge.fromStatus(booking.status),
              ],
            ),
            if (onModify != null || onCancel != null) ...[
              const SizedBox(height: 12),
              Row(
                children: [
                  if (onModify != null)
                    Expanded(
                      child: OutlinedButton.icon(
                        onPressed: onModify,
                        icon: const Icon(Icons.edit_calendar_outlined, size: 18),
                        label: const Text('Modifier'),
                        style: OutlinedButton.styleFrom(
                          foregroundColor: AppColors.primary,
                          padding: const EdgeInsets.symmetric(vertical: 10),
                        ),
                      ),
                    ),
                  if (onModify != null && onCancel != null) const SizedBox(width: 8),
                  if (onCancel != null)
                    Expanded(
                      child: OutlinedButton.icon(
                        onPressed: onCancel,
                        icon: const Icon(Icons.cancel_outlined, size: 18),
                        label: const Text('Annuler'),
                        style: OutlinedButton.styleFrom(
                          foregroundColor: AppColors.error,
                          padding: const EdgeInsets.symmetric(vertical: 10),
                        ),
                      ),
                    ),
                ],
              ),
            ],
          ],
        ),
      ),
    );
  }
}