<?php

namespace App\Support;

class Price
{
    /**
     * Format a price the Greek way: comma as the decimal separator, dot as
     * the thousands separator, and no decimals shown unless the amount
     * actually needs them (19.00 -> "19", 19.50 -> "19,5", 19.55 -> "19,55").
     */
    public static function format(float|int|string|null $amount, string $currency = '€'): ?string
    {
        if ($amount === null) {
            return null;
        }

        $amount = round((float) $amount, 2);
        $cents = (int) round($amount * 100);

        $decimals = match (true) {
            $cents % 100 === 0 => 0,
            $cents % 10 === 0 => 1,
            default => 2,
        };

        return $currency.number_format($amount, $decimals, ',', '.');
    }
}