import type { Logger, UseCaseOutputPort, UseCase } from '@core/shared/application';
import type { IPageViewRepository } from '../../domain/repositories/IPageViewRepository';
import { PageView } from '../../domain/entities/PageView';
import type { EntityType, VisitorType } from '../../domain/types/PageView';
import { Result } from '@core/shared/application/Result';
import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';

export interface RecordPageViewInput {
  entityType: EntityType;
  entityId: string;
  visitorId?: string;
  visitorType: VisitorType;
  sessionId: string;
  referrer?: string;
  userAgent?: string;
  country?: string;
}

export interface RecordPageViewOutput {
  pageViewId: string;
}

export type RecordPageViewErrorCode = 'REPOSITORY_ERROR';

export class RecordPageViewUseCase implements UseCase<RecordPageViewInput, RecordPageViewOutput, RecordPageViewErrorCode> {
  constructor(
    private readonly pageViewRepository: IPageViewRepository,
    private readonly logger: Logger,
  ) {}

  async execute(input: RecordPageViewInput): Promise<Result<RecordPageViewOutput, ApplicationErrorCode<RecordPageViewErrorCode, { message: string }>>> {
    try {
      const pageView = PageView.create({
        id: crypto.randomUUID(),
        entityType: input.entityType,
        entityId: input.entityId,
        visitorId: input.visitorId,
        visitorType: input.visitorType,
        sessionId: input.sessionId,
        referrer: input.referrer,
        userAgent: input.userAgent,
        country: input.country,
      });

      await this.pageViewRepository.save(pageView);

      this.logger.info('Page view recorded', {
        pageViewId: pageView.id,
        entityId: input.entityId,
        entityType: input.entityType,
      });

      const result = Result.ok<RecordPageViewOutput, ApplicationErrorCode<RecordPageViewErrorCode, { message: string }>>({
        pageViewId: pageView.id,
      });
      return result;
    } catch (error) {
      const err = error as Error;
      this.logger.error('Failed to record page view', err, { input });
      const result = Result.err<RecordPageViewOutput, ApplicationErrorCode<RecordPageViewErrorCode, { message: string }>>({
        code: 'REPOSITORY_ERROR',
        details: { message: err.message ?? 'Failed to record page view' },
      });
      return result;
    }
  }
}