import type { Big } from 'big.js';
import { FRACTIONAL_DIGITS, INTEGER_DIGITS } from './config';

/**
 * Format a Big value for display.
 * Uses FRACTIONAL_DIGITS decimal places (fixed-point).
 * If INTEGER_DIGITS is set, zero-pads the integer portion to that width.
 */
export function formatBig(v: Big): string {
	const fixed = v.toFixed(FRACTIONAL_DIGITS);
	if (INTEGER_DIGITS === undefined) return fixed;

	const [intPart, fracPart] = fixed.split('.');
	const paddedInt = intPart.padStart(INTEGER_DIGITS, '0');
	return fracPart !== undefined ? `${paddedInt}.${fracPart}` : paddedInt;
}