import 'package:flutter/material.dart';

import '../../../../api/connect/rmv/rmv_models.dart';
import '../../../../extensions/date_time.dart';
import 'product_chip.dart';
import 'realtime_time.dart';

/// Compact summary of a [Trip] used in the trip results list.
class TripTile extends StatelessWidget {
  final Trip trip;
  final VoidCallback? onTap;

  const TripTile({super.key, required this.trip, this.onTap});

  @override
  Widget build(BuildContext context) {
    final firstLeg = trip.legs.isEmpty ? null : trip.legs.first;
    final lastLeg = trip.legs.isEmpty ? null : trip.legs.last;
    if (firstLeg == null || lastLeg == null) {
      return const ListTile(title: Text('Verbindung ohne Halt'));
    }
    final scheduledStart = firstLeg.origin.scheduledTime;
    final scheduledEnd = lastLeg.destination.scheduledTime;
    final cancelled =
        trip.legs.any((l) => l.cancelled || l.partCancelled);
    final transfers = trip.transferCount ?? _countTransfers(trip);
    final duration = trip.realDuration ?? trip.duration;
    final productChips = trip.legs
        .where((l) => l.type == LegType.journey && l.product != null)
        .map((l) => Padding(
              padding: const EdgeInsets.only(right: 4),
              child: ProductChip(product: l.product, fallbackLabel: l.name),
            ))
        .toList();

    return ListTile(
      onTap: onTap,
      isThreeLine: true,
      title: Row(
        children: [
          RealtimeTime(
            scheduled: scheduledStart,
            realtime: firstLeg.origin.realTime,
            delayMinutes: firstLeg.origin.delayMinutes?.toInt(),
            cancelled: cancelled,
            style: Theme.of(context).textTheme.titleMedium,
          ),
          const Padding(
            padding: EdgeInsets.symmetric(horizontal: 6),
            child: Text('–'),
          ),
          RealtimeTime(
            scheduled: scheduledEnd,
            realtime: lastLeg.destination.realTime,
            delayMinutes: lastLeg.destination.delayMinutes?.toInt(),
            cancelled: cancelled,
            style: Theme.of(context).textTheme.titleMedium,
          ),
        ],
      ),
      subtitle: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const SizedBox(height: 4),
          Wrap(runSpacing: 4, children: productChips),
          const SizedBox(height: 4),
          Row(
            children: [
              if (duration != null) ...[
                const Icon(Icons.schedule, size: 14),
                const SizedBox(width: 2),
                Text(_formatDuration(duration)),
                const SizedBox(width: 12),
              ],
              const Icon(Icons.swap_horiz, size: 14),
              const SizedBox(width: 2),
              Text(
                transfers == 0
                    ? 'Direkt'
                    : '$transfers Umstieg${transfers > 1 ? 'e' : ''}',
              ),
            ],
          ),
        ],
      ),
      trailing: const Icon(Icons.chevron_right),
    );
  }

  int _countTransfers(Trip trip) {
    final journeyLegs =
        trip.legs.where((l) => l.type == LegType.journey).length;
    return journeyLegs <= 1 ? 0 : journeyLegs - 1;
  }
}

String _formatDuration(Duration d) {
  final hours = d.inHours;
  final minutes = d.inMinutes.remainder(60);
  if (hours == 0) return '$minutes min';
  return '$hours h ${minutes.toString().padLeft(2, '0')} min';
}

/// Re-export for trip detail screen.
String formatTripDuration(Duration d) => _formatDuration(d);

/// Helper used in date headers on the trip results list.
String formatTripDateHeader(DateTime when) => when.formatDateRelativeShort();