cashumit/lib/widgets/receipt_tear_effect.dart

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

/// Widget untuk efek kertas struk tersobek di bagian atas
class ReceiptTearTop extends StatelessWidget {
  final double? width;
  const ReceiptTearTop({super.key, this.width});

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final effectiveWidth = width ??
            (constraints.maxWidth.isFinite ? constraints.maxWidth : 360.0);
        return Container(
          width: effectiveWidth,
          color: Colors.grey[300],
          child: CustomPaint(
            size: Size(effectiveWidth, 20),
            painter: _TearPainter(isTop: true),
          ),
        );
      },
    );
  }
}

/// Widget untuk efek kertas struk tersobek di bagian bawah
class ReceiptTearBottom extends StatelessWidget {
  final double? width;
  const ReceiptTearBottom({super.key, this.width});

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final effectiveWidth = width ??
            (constraints.maxWidth.isFinite ? constraints.maxWidth : 360.0);
        return Container(
          width: effectiveWidth,
          color: Colors.grey[300],
          child: CustomPaint(
            size: Size(effectiveWidth, 20),
            painter: _TearPainter(isTop: false),
          ),
        );
      },
    );
  }
}

/// CustomPainter untuk menggambar efek sobek
class _TearPainter extends CustomPainter {
  final bool isTop;

  _TearPainter({required this.isTop});

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.white
      ..style = PaintingStyle.fill;

    final path = Path();

    // Buat efek robekan dengan pola gigi proporsional terhadap lebar struk
    final random = Random(123); // Seed tetap agar pola robekan konsisten
    final segmentCount = (size.width / 18).round().clamp(15, 40);
    final segmentWidth = size.width / segmentCount;
    
    if (isTop) {
      // Start from top left
      path.moveTo(0, 0);
      
      // Create tear effect with randomized peaks/valleys
      // For top tear, peaks point upward (out of the paper)
      for (int i = 0; i <= segmentCount; i++) {
        final x = i * segmentWidth;
        // Alternate between peaks and valleys
        final y = (i % 2 == 0) 
            ? -(2 + random.nextDouble() * 3) // Peak pointing upward (negative Y)
            : 0.0; // Valley at top edge
        path.lineTo(x, y);
      }
      
      // Close the path
      path.lineTo(size.width, 0);
      path.lineTo(size.width, size.height);
      path.lineTo(0, size.height);
      path.close();
    } else {
      // Start from bottom left
      path.moveTo(0, size.height);
      
      // Create tear effect with randomized peaks/valleys
      // For bottom tear, peaks point downward (out of the paper)
      for (int i = 0; i <= segmentCount; i++) {
        final x = i * segmentWidth;
        // Alternate between peaks and valleys
        final y = (i % 2 == 0) 
            ? size.height + (2 + random.nextDouble() * 3) // Peak pointing downward
            : size.height.toDouble(); // Valley at bottom edge
        path.lineTo(x, y);
      }
      
      // Close the path
      path.lineTo(size.width, size.height);
      path.lineTo(size.width, 0);
      path.lineTo(0, 0);
      path.close();
    }

    canvas.drawPath(path, paint);
  }

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