import type { AuthSession, IdentitySessionPort } from '../ports/IdentitySessionPort';
import { Result } from '@core/shared/application/Result';
import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';
import type { UseCaseOutputPort, Logger } from '@core/shared/application';

export type GetCurrentUserSessionInput = void;

export type GetCurrentUserSessionResult = AuthSession | null;

export type GetCurrentUserSessionErrorCode = 'REPOSITORY_ERROR';

export type GetCurrentUserSessionApplicationError = ApplicationErrorCode<
  GetCurrentUserSessionErrorCode,
  { message: string }
>;

export class GetCurrentUserSessionUseCase {
  constructor(
    private readonly sessionPort: IdentitySessionPort,
    private readonly logger: Logger,
    private readonly output: UseCaseOutputPort<GetCurrentUserSessionResult>,
  ) {}

  async execute(): Promise<Result<void, GetCurrentUserSessionApplicationError>> {
    try {
      const session = await this.sessionPort.getCurrentSession();

      this.output.present(session);

      return Result.ok(undefined);
    } catch (error) {
      const message =
        error instanceof Error && error.message
          ? error.message
          : 'Failed to execute GetCurrentUserSessionUseCase';

      this.logger.error(
        'GetCurrentUserSessionUseCase.execute failed',
        error instanceof Error ? error : undefined,
        {},
      );

      return Result.err({
        code: 'REPOSITORY_ERROR',
        details: { message },
      } as GetCurrentUserSessionApplicationError);
    }
  }
}