/**
 * Validates a Lightning Address format
 */
export function validateLightningAddress(address: string): boolean {
  if (!address || typeof address !== 'string') {
    return false;
  }

  // Must contain @ symbol
  if (!address.includes('@')) {
    return false;
  }

  // Basic email-like format check
  const parts = address.split('@');
  if (parts.length !== 2) {
    return false;
  }

  const [username, domain] = parts;

  // Username and domain must not be empty
  if (!username || !domain) {
    return false;
  }

  // Length check
  if (address.length > 255) {
    return false;
  }

  return true;
}

/**
 * Validates Nostr public key (hex or npub format)
 */
export function validateNostrPubkey(pubkey: string): boolean {
  if (!pubkey || typeof pubkey !== 'string') {
    return false;
  }

  // Hex format: 64 characters
  if (/^[0-9a-f]{64}$/i.test(pubkey)) {
    return true;
  }

  // npub format (bech32)
  if (pubkey.startsWith('npub1') && pubkey.length === 63) {
    return true;
  }

  return false;
}

/**
 * Validates number of tickets
 */
export function validateTicketCount(count: number, max: number = 100): boolean {
  return Number.isInteger(count) && count > 0 && count <= max;
}

/**
 * Sanitizes input string
 */
export function sanitizeString(input: string, maxLength: number = 255): string {
  if (!input) return '';
  return input.trim().substring(0, maxLength);
}