// Author: fruit.com.cn

import 'dart:math' as math;

import 'package:flutter/material.dart';

/// 首页右上角搜索/礼物图标的自定义样式：
/// 搜索为粗线条放大镜（Material 图标无法调线条粗细），礼物为 emoji 红金礼盒。

/// 粗线条白色放大镜，圆环在左上、手柄朝右下。
class SearchGlyph extends StatelessWidget {
  const SearchGlyph({super.key, required this.size, required this.color});

  final double size;
  final Color color;

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

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

  final Color color;

  @override
  void paint(Canvas canvas, Size size) {
    final stroke = size.width * 0.09;
    final paint = Paint()
      ..color = color
      ..style = PaintingStyle.stroke
      ..strokeWidth = stroke
      ..strokeCap = StrokeCap.round;

    final circleDiameter = size.width * 0.7;
    final direction = math.pi / 4;
    // 图形只占画布左上角，先平移让它视觉居中，否则会比文字基线偏高。
    final drawnExtent =
        circleDiameter / 2 +
        (circleDiameter / 2 + size.width * 0.12) * math.sin(direction) +
        stroke / 2;
    final centering = (size.width - drawnExtent) / 2;
    canvas.translate(centering, centering);

    final center = Offset(circleDiameter / 2, circleDiameter / 2);
    canvas.drawCircle(center, circleDiameter / 2 - stroke / 2, paint);

    final start = center + Offset.fromDirection(direction, circleDiameter / 2 - stroke * 0.2);
    final end = center + Offset.fromDirection(direction, circleDiameter / 2 + size.width * 0.12);
    canvas.drawLine(start, end, paint);
  }

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

/// emoji 礼盒（红盒金丝带，随系统 emoji 风格渲染）。
class GiftGlyph extends StatelessWidget {
  const GiftGlyph({super.key, required this.size});

  final double size;

  @override
  Widget build(BuildContext context) {
    return SizedBox.square(
      dimension: size,
      child: FittedBox(
        child: Text('🎁', style: TextStyle(fontSize: size, height: 1)),
      ),
    );
  }
}