import 'package:clide/widgets/src/clide_settings.dart';
import 'package:flutter/widgets.dart';

/// Stateless painter producing a single-color icon. Every icon in
/// `widgets/src/icons/` subclasses this; widgets wrap with [ClideIcon]
/// for size + color-from-theme.
abstract class ClideIconPainter {
  const ClideIconPainter();

  /// Paint the icon into a unit square (0,0 .. 1,1).
  void paint(Canvas canvas, Color color);
}

/// Draws nothing, but [ClideIcon] still reserves its `size×size` box — so a
/// caller can keep the icon slot for alignment without showing a glyph. This is
/// the *intentional* empty (e.g. a non-search filter field), distinct from an
/// unknown glyph name, which renders a visible `placeholder` error box (T-314).
class EmptyIconPainter extends ClideIconPainter {
  const EmptyIconPainter();

  @override
  void paint(Canvas canvas, Color color) {}

  @override
  bool operator ==(Object other) => other is EmptyIconPainter;

  @override
  int get hashCode => (EmptyIconPainter).hashCode;
}

class ClideIcon extends StatelessWidget {
  const ClideIcon(this.painter, {super.key, this.size = 14, this.color});

  final ClideIconPainter painter;
  final double size;
  final Color? color;

  @override
  Widget build(BuildContext context) {
    final resolved = color ?? ClideSettings.theme.of(context).surface.globalForeground;
    return SizedBox(
      width: size,
      height: size,
      child: CustomPaint(
        size: Size(size, size),
        painter: _IconPainterAdapter(painter: painter, color: resolved),
      ),
    );
  }
}

class _IconPainterAdapter extends CustomPainter {
  _IconPainterAdapter({required this.painter, required this.color});

  final ClideIconPainter painter;
  final Color color;

  @override
  void paint(Canvas canvas, Size size) {
    canvas.save();
    canvas.scale(size.width, size.height);
    painter.paint(canvas, color);
    canvas.restore();
  }

  @override
  bool shouldRepaint(covariant _IconPainterAdapter old) => old.painter != painter || old.color != color;
}