/**
 * Use Case: RecordPageViewUseCase
 *
 * Records a page view event when a visitor accesses an entity page.
 */
 
import type { AsyncUseCase } from '@gridpilot/shared/application';
import { PageView } from '../../domain/entities/PageView';
import type { EntityType, VisitorType } from '../../domain/types/PageView';
import type { IPageViewRepository } from '../../domain/repositories/IPageViewRepository';

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 class RecordPageViewUseCase
  implements AsyncUseCase<RecordPageViewInput, RecordPageViewOutput> {
  constructor(private readonly pageViewRepository: IPageViewRepository) {}

  async execute(input: RecordPageViewInput): Promise<RecordPageViewOutput> {
    const pageViewId = `pv-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;

    const baseProps: Omit<Parameters<typeof PageView.create>[0], 'timestamp'> = {
      id: pageViewId,
      entityType: input.entityType,
      entityId: input.entityId,
      visitorType: input.visitorType,
      sessionId: input.sessionId,
    };

    const pageView = PageView.create({
      ...baseProps,
      ...(input.visitorId !== undefined ? { visitorId: input.visitorId } : {}),
      ...(input.referrer !== undefined ? { referrer: input.referrer } : {}),
      ...(input.userAgent !== undefined ? { userAgent: input.userAgent } : {}),
      ...(input.country !== undefined ? { country: input.country } : {}),
    });

    await this.pageViewRepository.save(pageView);

    return { pageViewId };
  }
}