import {
  ArrayMaxSize,
  IsArray,
  IsNotEmpty,
  IsOptional,
  IsString,
  Matches,
} from 'class-validator';

/**
 * DTO for domain availability check requests.
 *
 * Per T-03-05: domain input is validated with regex — only alphanumeric
 * characters and hyphens allowed, no dots, max 63 chars (DNS label limit).
 */
export class CheckDomainDto {
  @IsString()
  @IsNotEmpty()
  @Matches(/^[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$/, {
    message:
      'Domain must be a valid label: alphanumeric and hyphens only, 1-63 characters, cannot start or end with a hyphen',
  })
  domain!: string;

  /**
   * Optional list of TLDs to check. If omitted, defaults are used.
   * Per T-03-06: max 10 TLDs per request to prevent DoS.
   */
  @IsOptional()
  @IsArray()
  @IsString({ each: true })
  @ArrayMaxSize(10, { message: 'Maximum 10 TLDs per request' })
  tlds?: string[];
}