import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_calendar/calendar.dart';

import 'cross_painter.dart';

class AppointmentTile extends StatelessWidget {
  static const _radius = BorderRadius.all(Radius.circular(7));

  final Appointment appointment;
  final bool crossedOut;

  const AppointmentTile({super.key, required this.appointment, this.crossedOut = false});

  @override
  Widget build(BuildContext context) {
    final isPast = appointment.endTime.isBefore(DateTime.now());
    final color = appointment.color.withAlpha(isPast ? 160 : 255);

    final locationLines = (appointment.location ?? '')
        .split('\n')
        .where((p) => p.isNotEmpty)
        .take(2)
        .toList(growable: false);

    return Padding(
      padding: const EdgeInsets.all(1),
      child: Stack(
        children: [
          Positioned.fill(
            child: Container(
              padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
              alignment: Alignment.topLeft,
              decoration: BoxDecoration(
                shape: BoxShape.rectangle,
                borderRadius: _radius,
                color: color,
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                mainAxisSize: MainAxisSize.min,
                children: [
                  _ScaledLine(
                    text: appointment.subject,
                    fontSize: 15,
                    fontWeight: FontWeight.w500,
                  ),
                  for (final line in locationLines)
                    _ScaledLine(text: line, fontSize: 10),
                ],
              ),
            ),
          ),
          if (crossedOut)
            Positioned.fill(
              child: ClipRRect(
                borderRadius: _radius,
                child: DecoratedBox(
                  decoration: BoxDecoration(
                    border: Border.all(width: 2, color: Colors.red.withAlpha(200)),
                    borderRadius: _radius,
                  ),
                  child: CustomPaint(painter: CrossPainter()),
                ),
              ),
            ),
        ],
      ),
    );
  }
}

/// One row of appointment text. The FittedBox scales **only this line** down
/// when the text is wider than the tile, so a long teacher name does not
/// shrink the room number above it.
class _ScaledLine extends StatelessWidget {
  final String text;
  final double fontSize;
  final FontWeight? fontWeight;

  const _ScaledLine({
    required this.text,
    required this.fontSize,
    this.fontWeight,
  });

  @override
  Widget build(BuildContext context) => FittedBox(
        fit: BoxFit.scaleDown,
        alignment: Alignment.centerLeft,
        child: Text(
          text,
          style: TextStyle(
            color: Colors.white,
            fontSize: fontSize,
            fontWeight: fontWeight,
            height: 1.1,
          ),
          maxLines: 1,
          softWrap: false,
        ),
      );
}