import 'package:flutter/material.dart';

/// Einfarbig gefuellte Papierflieger-Silhouette (design/B_paperplane.svg,
/// dieselben Koordinaten wie DroneMarkerIcon/DroneFollowIcon) in beliebiger
/// Farbe - fuer kleine Statusanzeigen, in denen die Farbe selbst die
/// Information traegt (siehe _DroneStatusPill in bottom_stats_bar.dart),
/// statt der zweifarbigen bzw. fest pinken Varianten der beiden anderen
/// Verwendungsstellen.
class PaperPlaneIcon extends StatelessWidget {
  const PaperPlaneIcon({super.key, required this.size, required this.color});

  final double size;
  final Color color;

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: size,
      height: size,
      child: CustomPaint(painter: _PaperPlaneFillPainter(color: color)),
    );
  }
}

class _PaperPlaneFillPainter extends CustomPainter {
  _PaperPlaneFillPainter({required this.color});

  final Color color;

  // Gleiche Koordinaten wie DroneMarkerIcon._PaperPlanePainter (viewBox
  // 0 0 200 200, design/B_paperplane.svg): Spitze oben, zwei Fluegel unten,
  // Heckkerbe dazwischen.
  static const _viewBoxSize = 200.0;
  static const _nose = Offset(100, 22);
  static const _rightWing = Offset(164, 172);
  static const _tailNotch = Offset(100, 138);
  static const _leftWing = Offset(36, 172);

  @override
  void paint(Canvas canvas, Size size) {
    final scale = size.width / _viewBoxSize;
    Offset s(Offset p) => p * scale;

    final outline = Path()
      ..moveTo(s(_nose).dx, s(_nose).dy)
      ..lineTo(s(_rightWing).dx, s(_rightWing).dy)
      ..lineTo(s(_tailNotch).dx, s(_tailNotch).dy)
      ..lineTo(s(_leftWing).dx, s(_leftWing).dy)
      ..close();

    canvas.drawPath(outline, Paint()..color = color);
  }

  @override
  bool shouldRepaint(covariant _PaperPlaneFillPainter oldDelegate) =>
      oldDelegate.color != color;
}