export const formatCurrency = (amount: number, currencyCode?: string | null) => {
    // format number with 2 decimal places and a thousand separator
    // amount is in cents
    const amountInUnits = amount / 100;

    // Use Intl.NumberFormat for proper currency formatting
    try {
        return new Intl.NumberFormat('hr-HR', {
            style: 'currency',
            currency: currencyCode ?? "EUR",
            minimumFractionDigits: 2,
            maximumFractionDigits: 2,
        }).format(amountInUnits);
    } catch (e) {
        // Fallback if invalid currency code
        console.error(`Invalid currency code: ${currencyCode}`, e);
    }
}

/**
 * Formats an IBAN for display with proper spacing
 * Format: XX12 XXXX XXXX XXXX XXXX XX
 * First group: 2 letters (country) + 2 digits (check) = 4 chars
 * Following groups: 4 characters each
 * Last group: can be less than 4 characters
 * @param iban - IBAN string without spaces
 * @returns Formatted IBAN with spaces
 */
export const formatIban = (iban: string | null | undefined): string => {
    if (!iban) return "";

    // Remove any existing spaces
    const cleaned = iban.replace(/\s/g, '');

    // Split into groups: first 4 chars, then groups of 4
    const groups: string[] = [];
    for (let i = 0; i < cleaned.length; i += 4) {
        groups.push(cleaned.slice(i, i + 4));
    }

    return groups.join(' ');
}
