PlayMaker/lib/grafico de pizza/widgets/grafico_widgets.dart

import 'package:flutter/material.dart';
import 'dart:math' as math;

class PieChartWidget extends StatelessWidget {
  final double victoryPercentage;
  final double defeatPercentage;
  final double drawPercentage;
  final double sf;

  const PieChartWidget({
    super.key,
    required this.victoryPercentage,
    required this.defeatPercentage,
    this.drawPercentage = 0,
    required this.sf,
  });

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        // 👇 MAGIA ANTI-DESAPARECIMENTO 👇
        // Vê o espaço real. Se por algum motivo for infinito, assume 100 para não sumir.
        final double w = constraints.maxWidth.isInfinite ? 100.0 : constraints.maxWidth;
        final double h = constraints.maxHeight.isInfinite ? 100.0 : constraints.maxHeight;
        
        // Pega no menor valor para garantir que o círculo não é cortado
        final double size = math.min(w, h);
        
        return Center(
          child: SizedBox(
            width: size,
            height: size,
            child: CustomPaint(
              painter: _PieChartPainter(
                victoryPercentage: victoryPercentage,
                defeatPercentage: defeatPercentage,
                drawPercentage: drawPercentage,
              ),
              child: Center(
                child: _buildCenterLabels(size),
              ),
            ),
          ),
        );
      },
    );
  }

  Widget _buildCenterLabels(double size) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text(
          '${(victoryPercentage * 100).toStringAsFixed(1)}%',
          style: TextStyle(
            fontSize: size * 0.18, // O texto cresce ou encolhe com o círculo
            fontWeight: FontWeight.bold,
            color: Colors.white,
          ),
        ),
        SizedBox(height: size * 0.02),
        Text(
          'Vitórias',
          style: TextStyle(
            fontSize: size * 0.10, 
            color: Colors.white.withOpacity(0.8),
          ),
        ),
      ],
    );
  }
}

class _PieChartPainter extends CustomPainter {
  final double victoryPercentage;
  final double defeatPercentage;
  final double drawPercentage;

  _PieChartPainter({
    required this.victoryPercentage,
    required this.defeatPercentage,
    required this.drawPercentage,
  });

  @override
  void paint(Canvas canvas, Size size) {
    final center = Offset(size.width / 2, size.height / 2);
    // Margem de 5% para a linha de fora não ser cortada
    final radius = (size.width / 2) - (size.width * 0.05); 
    
    const victoryColor = Colors.green;
    const defeatColor = Colors.red;
    const drawColor = Colors.yellow;
    const borderColor = Colors.white30;

    double startAngle = -math.pi / 2; 
    
    if (victoryPercentage > 0) {
      final sweepAngle = 2 * math.pi * victoryPercentage;
      _drawSector(canvas, center, radius, startAngle, sweepAngle, victoryColor, size.width);
      startAngle += sweepAngle;
    }
    
    if (drawPercentage > 0) {
      final sweepAngle = 2 * math.pi * drawPercentage;
      _drawSector(canvas, center, radius, startAngle, sweepAngle, drawColor, size.width);
      startAngle += sweepAngle;
    }
    
    if (defeatPercentage > 0) {
      final sweepAngle = 2 * math.pi * defeatPercentage;
      _drawSector(canvas, center, radius, startAngle, sweepAngle, defeatColor, size.width);
    }
    
    final borderPaint = Paint()
      ..color = borderColor
      ..style = PaintingStyle.stroke
      ..strokeWidth = size.width * 0.02; 
    
    canvas.drawCircle(center, radius, borderPaint);
  }

  void _drawSector(Canvas canvas, Offset center, double radius, double startAngle, double sweepAngle, Color color, double totalWidth) {
    final paint = Paint()
      ..color = color
      ..style = PaintingStyle.fill;
    
    canvas.drawArc(Rect.fromCircle(center: center, radius: radius), startAngle, sweepAngle, true, paint);
    
    if (sweepAngle < 2 * math.pi) {
      final linePaint = Paint()
        ..color = Colors.white.withOpacity(0.5)
        ..style = PaintingStyle.stroke
        ..strokeWidth = totalWidth * 0.015; 
      
      final lineX = center.dx + radius * math.cos(startAngle);
      final lineY = center.dy + radius * math.sin(startAngle);
      
      canvas.drawLine(center, Offset(lineX, lineY), linePaint);
    }
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
}