/**
 * Async Use Case interface for queries.
 *
 * Queries do not change system state and return data directly.
 * The output is most often a Result<T, E> where T is the data and E is a domain error code,
 * to handle business rejections explicitly. Use cases do not throw errors; they use error codes in Result.
 *
 * Example:
 * ```typescript
 * export type YourUseCaseError =
 *   | 'SPONSOR_NOT_FOUND'
 *   | 'PRICING_NOT_CONFIGURED'
 *   | 'APPLICATIONS_CLOSED'
 *   | 'NO_SLOTS_AVAILABLE'
 *   | 'DUPLICATE_PENDING_REQUEST'
 *   | 'OFFER_BELOW_MINIMUM';
 *
 * export class ApplyForSponsorshipUseCase implements AsyncUseCase<Input, Result<SuccessDTO, YourUseCaseError>> {
 *   async execute(input: Input): Promise<Result<SuccessDTO, YourUseCaseError>> {
 *     // implementation
 *   }
 * }
 * ```
 *
 * @template Input - The input type for the use case
 * @template Output - The output type returned by the use case, often Result<T, DomainErrorCode>
 */
export interface AsyncUseCase<Input, Output> {
  execute(input: Input): Promise<Output>;
}