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/theme/app_colors.dart';
import '../../../core/widgets/empty_state.dart';
import '../../../core/widgets/machine_grid_layout.dart';
import '../../../core/widgets/machine_widgets.dart';
import '../../establishments/data/establishment_repository.dart';
import '../../establishments/domain/establishment.dart';

/// Écran laverie — grille machines.
class EstablishmentDetailScreen extends ConsumerStatefulWidget {
  const EstablishmentDetailScreen({
    super.key,
    required this.establishmentUuid,
  });

  final String establishmentUuid;

  @override
  ConsumerState<EstablishmentDetailScreen> createState() => _EstablishmentDetailScreenState();
}

class _EstablishmentDetailScreenState extends ConsumerState<EstablishmentDetailScreen> {
  String _filter = 'all';

  List<Machine> _filterMachines(List<Machine> machines) => switch (_filter) {
        'washer' => machines.where((m) => m.type.startsWith('washer')).toList(),
        'dryer' => machines.where((m) => m.type.startsWith('dryer')).toList(),
        _ => machines,
      };

  @override
  Widget build(BuildContext context) {
    final establishmentAsync =
        ref.watch(establishmentDetailProvider(widget.establishmentUuid));

    return Scaffold(
      backgroundColor: AppColors.background,
      appBar: AppBar(
        title: establishmentAsync.maybeWhen(
          data: (e) => Text(e.name, overflow: TextOverflow.ellipsis),
          orElse: () => const Text('Ma laverie'),
        ),
      ),
      body: establishmentAsync.when(
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (error, _) => EmptyState(
          icon: Icons.error_outline,
          title: 'Erreur',
          subtitle: '$error',
          actionLabel: 'Réessayer',
          onAction: () => ref.invalidate(establishmentDetailProvider(widget.establishmentUuid)),
        ),
        data: (establishment) => _EstablishmentBody(
          establishment: establishment,
          filter: _filter,
          onFilterChanged: (value) => setState(() => _filter = value),
          onRefresh: () async {
            ref.invalidate(establishmentDetailProvider(widget.establishmentUuid));
          },
          machines: _filterMachines(establishment.machines),
          onMachineTap: (machine) => context.push(AppRoutes.machineAction(machine.uuid)),
        ),
      ),
    );
  }
}

class _EstablishmentBody extends StatelessWidget {
  const _EstablishmentBody({
    required this.establishment,
    required this.filter,
    required this.onFilterChanged,
    required this.onRefresh,
    required this.machines,
    required this.onMachineTap,
  });

  final Establishment establishment;
  final String filter;
  final ValueChanged<String> onFilterChanged;
  final Future<void> Function() onRefresh;
  final List<Machine> machines;
  final ValueChanged<Machine> onMachineTap;

  @override
  Widget build(BuildContext context) {
    return RefreshIndicator(
      onRefresh: onRefresh,
      child: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          Container(
            padding: const EdgeInsets.all(16),
            decoration: BoxDecoration(
              gradient: AppColors.gradientAccent,
              borderRadius: BorderRadius.circular(14),
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  establishment.name,
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 18,
                    fontWeight: FontWeight.w600,
                  ),
                ),
                const SizedBox(height: 4),
                Text(
                  establishment.fullAddress,
                  style: TextStyle(color: Colors.white.withValues(alpha: 0.9), fontSize: 13),
                ),
              ],
            ),
          ),
          const SizedBox(height: 16),
          if (establishment.machines.isNotEmpty) ...[
            MachineStatsRow(machines: establishment.machines),
            const SizedBox(height: 12),
            const MachineStatusLegend(),
            const SizedBox(height: 16),
            SingleChildScrollView(
              scrollDirection: Axis.horizontal,
              child: Row(
                children: [
                  _FilterChip(
                    label: 'Toutes',
                    selected: filter == 'all',
                    onTap: () => onFilterChanged('all'),
                  ),
                  const SizedBox(width: 8),
                  _FilterChip(
                    label: 'Lave-linge',
                    selected: filter == 'washer',
                    onTap: () => onFilterChanged('washer'),
                  ),
                  const SizedBox(width: 8),
                  _FilterChip(
                    label: 'Sèche-linge',
                    selected: filter == 'dryer',
                    onTap: () => onFilterChanged('dryer'),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 16),
          ],
          if (establishment.machines.isEmpty)
            const EmptyState(
              icon: Icons.local_laundry_service_outlined,
              title: 'Aucune machine',
              subtitle: 'Cette laverie n\'a pas encore de machines.',
            )
          else if (machines.isEmpty)
            const EmptyState(
              icon: Icons.filter_alt_outlined,
              title: 'Aucun résultat',
              subtitle: 'Aucune machine dans cette catégorie.',
            )
          else
            GridView.builder(
              shrinkWrap: true,
              physics: const NeverScrollableScrollPhysics(),
              gridDelegate: MachineGridLayout.delegate(context),
              itemCount: machines.length,
              itemBuilder: (context, index) => MachineGridCard(
                machine: machines[index],
                onTap: () => onMachineTap(machines[index]),
              ),
            ),
        ],
      ),
    );
  }
}

class _FilterChip extends StatelessWidget {
  const _FilterChip({
    required this.label,
    required this.selected,
    required this.onTap,
  });

  final String label;
  final bool selected;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return FilterChip(
      label: Text(label),
      selected: selected,
      onSelected: (_) => onTap(),
      selectedColor: AppColors.primary.withValues(alpha: 0.15),
      checkmarkColor: AppColors.primary,
      labelStyle: TextStyle(
        color: selected ? AppColors.primary : AppColors.textSecondary,
        fontWeight: selected ? FontWeight.w600 : FontWeight.normal,
      ),
    );
  }
}