import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'nFormatter',
  standalone: true,
})
export class NFormatterPipe implements PipeTransform {
  transform(value: number | string): string {
    return this.nFormatter(value, 2);
  }

  public nFormatter(num: number | string, digits: number) {
    num = num as number;
    const si = [
      { value: 1, symbol: '' },
      { value: 1e3, symbol: 'K' },
      { value: 1e6, symbol: 'M' },
      { value: 1e9, symbol: 'G' },
      { value: 1e12, symbol: 'T' },
      { value: 1e15, symbol: 'P' },
      { value: 1e18, symbol: 'E' },
    ];
    const rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
    let i;
    for (i = si.length - 1; i > 0; i--) {
      if (num >= si[i].value) {
        break;
      }
    }

    let total = (num / si[i].value).toFixed(digits).replace(rx, '$1');
    if (si[i].symbol) {
      return total + si[i].symbol;
    } else {
      if (!total.includes('.') && !Number.isInteger(parseFloat(total))) {
        total = total + '.00';
      }
      return total;
    }
  }
}