/**
 * Currency utilities for formatting amounts with proper symbols
 */

// Currency symbols map
const CURRENCY_SYMBOLS: Record<string, string> = {
  USD: '$',
  EUR: '€',
  GBP: '£',
  INR: '₹',
  JPY: '¥',
  CNY: '¥',
  AUD: 'A$',
  CAD: 'C$',
  CHF: 'Fr',
  SEK: 'kr',
  NOK: 'kr',
  DKK: 'kr',
  PLN: 'zł',
  BRL: 'R$',
  ZAR: 'R',
  AED: 'د.إ',
  SAR: 'ر.س',
  PKR: '₨',
};

/**
 * Get currency symbol for a currency code
 */
export const getCurrencySymbol = (currencyCode?: string): string => {
  if (!currencyCode) return '$';
  const code = currencyCode.toUpperCase();
  return CURRENCY_SYMBOLS[code] || `${code} `;
};

/**
 * Format an amount with the proper currency symbol
 * @param amount - The amount to format (string or number)
 * @param currency - The currency code (e.g., 'USD', 'PKR')
 * @param showDecimals - Whether to show decimal places (default: true for most currencies)
 */
export const formatCurrency = (
  amount: string | number,
  currency?: string,
  showDecimals: boolean = true
): string => {
  const numAmount = typeof amount === 'string' ? parseFloat(amount) : amount;
  if (isNaN(numAmount)) return '-';
  
  const symbol = getCurrencySymbol(currency);
  
  // For zero-decimal currencies like JPY, don't show decimals
  const zeroDecimalCurrencies = ['JPY', 'KRW', 'VND'];
  const shouldShowDecimals = showDecimals && !zeroDecimalCurrencies.includes(currency?.toUpperCase() || '');
  
  const formatted = shouldShowDecimals 
    ? numAmount.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
    : numAmount.toLocaleString('en-US', { maximumFractionDigits: 0 });
  
  return `${symbol}${formatted}`;
};

/**
 * Format price for display (typically USD)
 */
export const formatPrice = (price: string | number): string => {
  return formatCurrency(price, 'USD');
};