/// Renders Reward Icon pieces for the FocusFlow Flutter timeline.
library;

import 'package:flutter/material.dart';

import '../../theme/focus_flow_tokens.dart';

/// Sparkle-style reward indicator for a timeline task.
class RewardIcon extends StatelessWidget {
  /// Creates a reward icon.
  const RewardIcon({
    this.color = FocusFlowTokens.accentMagenta,
    this.size = 24,
    super.key,
  });

  /// Fill color used by the icon painter.
  final Color color;

  /// Square size of the painted icon.
  final double size;

  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      size: Size.square(size),
      painter: _RewardIconPainter(color),
    );
  }
}

class _RewardIconPainter extends CustomPainter {
  const _RewardIconPainter(this.color);

  final Color color;

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = color
      ..style = PaintingStyle.fill;
    _drawSparkle(
      canvas,
      paint,
      size.center(Offset.zero),
      size.shortestSide * 0.44,
    );
    _drawSparkle(
      canvas,
      paint,
      Offset(size.width * 0.78, size.height * 0.24),
      size.shortestSide * 0.18,
    );
    _drawSparkle(
      canvas,
      paint,
      Offset(size.width * 0.24, size.height * 0.78),
      size.shortestSide * 0.14,
    );
  }

  void _drawSparkle(Canvas canvas, Paint paint, Offset center, double radius) {
    final path = Path()
      ..moveTo(center.dx, center.dy - radius)
      ..lineTo(center.dx + radius * 0.24, center.dy - radius * 0.24)
      ..lineTo(center.dx + radius, center.dy)
      ..lineTo(center.dx + radius * 0.24, center.dy + radius * 0.24)
      ..lineTo(center.dx, center.dy + radius)
      ..lineTo(center.dx - radius * 0.24, center.dy + radius * 0.24)
      ..lineTo(center.dx - radius, center.dy)
      ..lineTo(center.dx - radius * 0.24, center.dy - radius * 0.24)
      ..close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(covariant _RewardIconPainter oldDelegate) {
    return oldDelegate.color != color;
  }
}