part of '../custom_workweek_calendar.dart';

class _OutsideHoursStrip extends StatelessWidget {
  final DateTime weekStart;
  final List<Appointment> appointments;
  final double rulerWidth;
  final void Function(Appointment) onAppointmentTap;
  final bool Function(Appointment) isCrossedOut;

  const _OutsideHoursStrip({
    super.key,
    required this.weekStart,
    required this.appointments,
    required this.rulerWidth,
    required this.onAppointmentTap,
    required this.isCrossedOut,
  });

  @override
  Widget build(BuildContext context) {
    final outside = partitionAppointmentsForWeek(
      appointments,
      weekStart,
    ).outside;
    if (outside.every((day) => day.isEmpty)) return const SizedBox.shrink();

    final theme = Theme.of(context);
    final maxChipsPerDay = outside
        .map(
          (day) => day.length > kOutsideChipsMaxVisible
              ? kOutsideChipsMaxVisible
              : day.length,
        )
        .fold<int>(0, (m, c) => c > m ? c : m);
    final stripHeight =
        kOutsideStripVerticalPadding * 2 +
        maxChipsPerDay * kOutsideChipHeight +
        (maxChipsPerDay > 1 ? (maxChipsPerDay - 1) * kOutsideChipSpacing : 0);

    return Container(
      color: theme.colorScheme.surfaceContainerLowest,
      padding: const EdgeInsets.symmetric(
        vertical: kOutsideStripVerticalPadding,
      ),
      child: SizedBox(
        height: stripHeight - kOutsideStripVerticalPadding * 2,
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            SizedBox(width: rulerWidth),
            for (var d = 0; d < 5; d++)
              Expanded(
                child: _OutsideDayColumn(
                  appointments: outside[d],
                  onAppointmentTap: onAppointmentTap,
                  isCrossedOut: isCrossedOut,
                ),
              ),
          ],
        ),
      ),
    );
  }
}

class _OutsideDayColumn extends StatelessWidget {
  final List<Appointment> appointments;
  final void Function(Appointment) onAppointmentTap;
  final bool Function(Appointment) isCrossedOut;

  const _OutsideDayColumn({
    required this.appointments,
    required this.onAppointmentTap,
    required this.isCrossedOut,
  });

  void _showOverflow(BuildContext context, List<Appointment> hidden) {
    showDetailsBottomSheet(
      context,
      children: (sheetCtx) {
        final tiles = <Widget>[];
        for (var i = 0; i < hidden.length; i++) {
          if (i > 0) tiles.add(const Divider(height: 1));
          final apt = hidden[i];
          tiles.add(
            ListTile(
              leading: Container(
                width: 12,
                height: 12,
                decoration: BoxDecoration(
                  color: apt.color,
                  borderRadius: BorderRadius.circular(3),
                ),
              ),
              title: Text(
                apt.subject,
                style: isCrossedOut(apt)
                    ? const TextStyle(decoration: TextDecoration.lineThrough)
                    : null,
              ),
              subtitle: Text(_subtitleFor(apt)),
              onTap: () {
                Navigator.of(sheetCtx).pop();
                onAppointmentTap(apt);
              },
            ),
          );
        }
        return tiles;
      },
    );
  }

  static String _subtitleFor(Appointment a) {
    if (isAllDayLike(a)) return 'Ganztägig';
    return '${_hm(a.startTime)}–${_hm(a.endTime)}';
  }

  static String _hm(DateTime t) =>
      '${t.hour.toString().padLeft(2, '0')}:${t.minute.toString().padLeft(2, '0')}';

  @override
  Widget build(BuildContext context) {
    if (appointments.isEmpty) return const SizedBox.shrink();
    final sorted = [...appointments]
      ..sort((a, b) {
        final aLike = isAllDayLike(a);
        final bLike = isAllDayLike(b);
        if (aLike && !bLike) return -1;
        if (!aLike && bLike) return 1;
        return a.startTime.compareTo(b.startTime);
      });
    final visible = sorted.length <= kOutsideChipsMaxVisible
        ? sorted
        : sorted.take(kOutsideChipsMaxVisible - 1).toList();
    final overflow = sorted.length <= kOutsideChipsMaxVisible
        ? const <Appointment>[]
        : sorted.skip(kOutsideChipsMaxVisible - 1).toList();

    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 2),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          for (var i = 0; i < visible.length; i++) ...[
            if (i > 0) const SizedBox(height: kOutsideChipSpacing),
            SizedBox(
              height: kOutsideChipHeight,
              child: _OutsideChip(
                appointment: visible[i],
                onTap: () => onAppointmentTap(visible[i]),
              ),
            ),
          ],
          if (overflow.isNotEmpty) ...[
            const SizedBox(height: kOutsideChipSpacing),
            SizedBox(
              height: kOutsideChipHeight,
              child: _OutsideOverflowChip(
                count: overflow.length,
                onTap: () => _showOverflow(context, overflow),
              ),
            ),
          ],
        ],
      ),
    );
  }
}

class _OutsideChip extends StatelessWidget {
  final Appointment appointment;
  final VoidCallback onTap;

  const _OutsideChip({required this.appointment, required this.onTap});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final allDay = isAllDayLike(appointment);
    final timeLabel = allDay
        ? null
        : '${appointment.startTime.hour.toString().padLeft(2, '0')}:${appointment.startTime.minute.toString().padLeft(2, '0')}';

    // Past chips fade further, future/ongoing ones get a more saturated tint
    // so the strip no longer reads as one uniform grey block.
    final isPast = appointment.endTime.isBefore(DateTime.now());
    final backgroundAlpha = isPast ? 38 : 120;
    final subjectColor = isPast
        ? theme.colorScheme.onSurfaceVariant
        : theme.colorScheme.onSurface;
    final subjectWeight = isPast ? FontWeight.w400 : FontWeight.w600;

    return Material(
      color: appointment.color.withAlpha(backgroundAlpha),
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(7)),
      ),
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onTap: onTap,
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
          child: Row(
            mainAxisSize: MainAxisSize.max,
            children: [
              Expanded(
                child: Text(
                  appointment.subject,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  softWrap: false,
                  style: theme.textTheme.labelSmall?.copyWith(
                    color: subjectColor,
                    fontWeight: subjectWeight,
                  ),
                ),
              ),
              if (timeLabel != null) ...[
                const SizedBox(width: 4),
                Flexible(
                  child: Text(
                    timeLabel,
                    maxLines: 1,
                    overflow: TextOverflow.fade,
                    softWrap: false,
                    style: theme.textTheme.labelSmall?.copyWith(
                      color: theme.colorScheme.onSurfaceVariant,
                      fontSize: 10,
                    ),
                  ),
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }
}

class _OutsideOverflowChip extends StatelessWidget {
  final int count;
  final VoidCallback onTap;

  const _OutsideOverflowChip({required this.count, required this.onTap});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Material(
      color: theme.colorScheme.secondaryContainer,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(6)),
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onTap: onTap,
        child: Center(
          child: Text(
            '+$count weitere',
            style: theme.textTheme.labelSmall?.copyWith(
              color: theme.colorScheme.onSecondaryContainer,
              fontWeight: FontWeight.w600,
            ),
          ),
        ),
      ),
    );
  }
}