import { z } from 'zod';

/**
 * Email validation schema using Zod
 */
export const emailSchema = z.string()
  .email('Invalid email format')
  .min(3, 'Email too short')
  .max(254, 'Email too long')
  .toLowerCase()
  .trim();

/**
 * Validates an email address
 * @param email - The email address to validate
 * @returns Validation result with sanitized email or error
 */
export function validateEmail(email: string): {
  success: boolean;
  email?: string;
  error?: string;
} {
  const result = emailSchema.safeParse(email);
  
  if (result.success) {
    return {
      success: true,
      email: result.data,
    };
  }
  
  return {
    success: false,
    error: result.error.errors[0]?.message || 'Invalid email',
  };
}

/**
 * Check if email appears to be from a disposable email service
 * Basic check - can be extended with comprehensive list
 */
const DISPOSABLE_DOMAINS = new Set([
  'tempmail.com',
  'throwaway.email',
  'guerrillamail.com',
  'mailinator.com',
  '10minutemail.com',
]);

export function isDisposableEmail(email: string): boolean {
  const domain = email.split('@')[1]?.toLowerCase();
  return domain ? DISPOSABLE_DOMAINS.has(domain) : false;
}