import 'dart:math';

import 'package:flutter/material.dart';

class NumberDisplay extends StatelessWidget {
  NumberDisplay({this.value: ''});

  final String value;

  GlobalKey stickyKey = GlobalKey();

  @override
  Widget build(BuildContext context) {
    return Expanded(
      child: Padding(
          padding: const EdgeInsets.only(left: 20.0, right: 20.0, top: 20.0 ),
          child: Container(
            key: stickyKey,
            alignment: Alignment.topLeft,
            child: AnimatedDefaultTextStyle(
              duration: const Duration(milliseconds: 200),
              style: TextStyle(
                fontSize: fontSizeCalc(value: value),
                fontWeight: FontWeight.bold,
                color: Colors.black,
              ),
              child: Text(
                value,
              ),
            ),
          )),
    );
  }

  double fontSizeCalc({ String value = "    " }) {
    const double result = 40.0;
    try {
      const double global = 100000.0;
      double scale = (global / value.length);
      final pixelOfLetter = sqrt(scale);
      final pixelOfLetterP = pixelOfLetter - (pixelOfLetter * 5) / 100;
      if(pixelOfLetterP> result){
        return result;
      }
      return pixelOfLetterP;
    } catch(e) {
      return result;
    }
  }
}