/**
 * CurrencyDisplay
 *
 * Deterministic currency formatting for display.
 * Avoids Intl and toLocaleString to prevent SSR/hydration mismatches.
 */

export class CurrencyFormatter {
  /**
   * Formats an amount as currency (e.g., "$10.00" or "€1.000,00").
   * Default currency is USD.
   */
  static format(amount: number, currency: string = 'USD'): string {
    const symbol = currency === 'USD' ? '$' : currency === 'EUR' ? '€' : currency + ' ';
    const formattedAmount = amount.toFixed(2);
    
    // Add thousands separators
    const parts = formattedAmount.split('.');
    
    // Use dot as thousands separator for EUR, comma for USD
    if (currency === 'EUR') {
      parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, '.');
      return `${symbol}${parts[0]},${parts[1]}`;
    } else {
      parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',');
      return `${symbol}${parts.join('.')}`;
    }
  }

  /**
   * Formats an amount as a compact currency (e.g., "$10" or "€1.000").
   */
  static formatCompact(amount: number, currency: string = 'USD'): string {
    const symbol = currency === 'USD' ? '$' : currency === 'EUR' ? '€' : currency + ' ';
    const roundedAmount = Math.round(amount);
    
    // Add thousands separators
    const formattedAmount = roundedAmount.toString();
    
    // Use dot as thousands separator for EUR, comma for USD
    if (currency === 'EUR') {
      return `${symbol}${formattedAmount.replace(/\B(?=(\d{3})+(?!\d))/g, '.')}`;
    } else {
      return `${symbol}${formattedAmount.replace(/\B(?=(\d{3})+(?!\d))/g, ',')}`;
    }
  }
}