import 'package:flutter/material.dart';

/// The original APP.svg gradient, expressed in its view-box coordinates.
const tpBrandGradient = LinearGradient(
  begin: Alignment(2 * 324.09 / 2008.27 - 1, 2 * 1572.05 / 2009.62 - 1),
  end: Alignment(2 * 1871.99 / 2008.27 - 1, 2 * 280.93 / 2009.62 - 1),
  colors: [Color(0xFF3FD1FF), Color(0xFF38B3FF), Color(0xFF2A6CFF)],
  stops: [0, 0.28, 1],
);

/// Vector rendering of assets/branding/APP.svg; no raster scaling or redesign.
class TpLogo extends StatelessWidget {
  const TpLogo({super.key, this.size = 128, this.background = true});

  final double size;
  final bool background;

  @override
  Widget build(BuildContext context) => Semantics(
    label: 'TPSchedule 标志',
    image: true,
    child: SizedBox.square(
      dimension: size,
      child: CustomPaint(painter: _TpLogoPainter(background: background)),
    ),
  );
}

class _TpLogoPainter extends CustomPainter {
  const _TpLogoPainter({required this.background});
  final bool background;

  @override
  void paint(Canvas canvas, Size size) {
    canvas.save();
    canvas.scale(size.width / 2008.27, size.height / 2009.62);
    if (background) {
      const bounds = Rect.fromLTWH(0.5, 0.5, 2007.27, 2008.62);
      canvas.drawRect(
        bounds,
        Paint()
          ..shader = tpBrandGradient.createShader(
            const Rect.fromLTWH(0, 0, 2008.27, 2009.62),
          ),
      );
      canvas.drawRect(
        bounds,
        Paint()
          ..style = PaintingStyle.stroke
          ..strokeWidth = 1
          ..color = Colors.black,
      );
    }
    final stroke = Paint()
      ..style = PaintingStyle.stroke
      ..strokeJoin = StrokeJoin.miter
      ..strokeMiterLimit = 10
      ..strokeCap = StrokeCap.butt;
    canvas.drawRRect(
      RRect.fromRectAndRadius(
        const Rect.fromLTWH(405.1, 514.64, 1198.08, 1071.89),
        const Radius.circular(20),
      ),
      stroke
        ..color = const Color(0xFFFFD22A)
        ..strokeWidth = 217,
    );
    stroke
      ..color = Colors.white
      ..strokeWidth = 150;
    for (final x in [704.07, 1249.91]) {
      canvas.drawRRect(
        RRect.fromRectAndRadius(
          Rect.fromLTWH(x, 339.92, 64.51, 349.44),
          const Radius.circular(27.65),
        ),
        stroke,
      );
    }
    canvas.drawPath(
      Path()
        ..moveTo(729.01, 1004.81)
        ..relativeCubicTo(70.21, 112.08, 200.6, 174.7, 327.98, 152.69)
        ..relativeCubicTo(122.48, -18.51, 206.2, -123.19, 222.28, -152.69),
      stroke..strokeWidth = 185,
    );
    canvas.restore();
  }

  @override
  bool shouldRepaint(_TpLogoPainter oldDelegate) =>
      background != oldDelegate.background;
}