import { IsInt, IsOptional, IsString, IsUrl, MaxLength } from 'class-validator';

/**
 * DTO for updating an existing FavoriteLink.
 * All fields are optional — only provided fields are updated.
 * iconUrl accepts null explicitly to clear a stored icon.
 */
export class UpdateFavoriteDto {
  @IsOptional()
  @IsString()
  title?: string;

  @IsOptional()
  @IsUrl()
  url?: string;

  /**
   * iconUrl can be a string (updated URL), null (clear icon), or absent (no change).
   * No strict type validation so null passes through to Prisma.
   */
  @IsOptional()
  @IsString()
  @MaxLength(2048)
  iconUrl?: string | null;

  @IsOptional()
  @IsInt()
  position?: number;
}