<?php
/** Exact money input; all *_cents values remain hundredths of the major unit. */
namespace Abientot\Support;
use Abientot\Admin\Settings;
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
final class MoneyInput {
	/** Parse without floats or rounding; unsupported fractional precision fails closed. */
	public static function parse( string $value, ?string $currency = null ): int {
		$currency = $currency ?? (string) Settings::values()['currency'];
		$value    = Locale::normalize_number_input( $value );
		if ( ! preg_match( '/^(\d+)(?:\.(\d+))?$/D', $value, $parts ) ) {
			throw new \InvalidArgumentException( 'money_input' );
		}
		$whole    = ltrim( $parts[1], '0' );
		$whole    = $whole === '' ? '0' : $whole;
		$fraction = $parts[2] ?? '';
		// Extra zeroes carry no new value. Never round a third or fourth decimal.
		if ( trim( substr( $fraction, 2 ), '0' ) !== '' ) {
			throw new \InvalidArgumentException( 'money_precision' );
		}
		$fraction = (int) str_pad( substr( $fraction, 0, 2 ), 2, '0' );
		if ( strlen( $whole ) > 8 || (int) $whole > 21474836 || ( (int) $whole === 21474836 && $fraction > 47 ) ) {
			throw new \InvalidArgumentException( 'money_input' );
		}
		$cents = (int) $whole * 100 + $fraction;
		Currency::validate( $cents, $currency );
		return $cents;
	}
	/** Stable machine value for inputs and exports, independent of currency/locale. */
	public static function format( int $cents ): string {
		if ( $cents < 0 || $cents > 2147483647 ) {
			throw new \InvalidArgumentException( 'money_input' );
		}
		return (string) intdiv( $cents, 100 ) . '.' . str_pad( (string) ( $cents % 100 ), 2, '0', STR_PAD_LEFT );
	}
}