/**
 * Infrastructure: InMemoryPageViewRepository
 * 
 * In-memory implementation of IPageViewRepository for development/testing.
 */

import type { IPageViewRepository } from '../../domain/repositories/IPageViewRepository';
import { PageView, type EntityType } from '../../domain/entities/PageView';

export class InMemoryPageViewRepository implements IPageViewRepository {
  private pageViews: Map<string, PageView> = new Map();

  async save(pageView: PageView): Promise<void> {
    this.pageViews.set(pageView.id, pageView);
  }

  async findById(id: string): Promise<PageView | null> {
    return this.pageViews.get(id) ?? null;
  }

  async findByEntityId(entityType: EntityType, entityId: string): Promise<PageView[]> {
    return Array.from(this.pageViews.values()).filter(
      pv => pv.entityType === entityType && pv.entityId === entityId
    );
  }

  async findByDateRange(startDate: Date, endDate: Date): Promise<PageView[]> {
    return Array.from(this.pageViews.values()).filter(
      pv => pv.timestamp >= startDate && pv.timestamp <= endDate
    );
  }

  async findBySession(sessionId: string): Promise<PageView[]> {
    return Array.from(this.pageViews.values()).filter(
      pv => pv.sessionId === sessionId
    );
  }

  async countByEntityId(entityType: EntityType, entityId: string, since?: Date): Promise<number> {
    return Array.from(this.pageViews.values()).filter(
      pv => pv.entityType === entityType && 
            pv.entityId === entityId &&
            (!since || pv.timestamp >= since)
    ).length;
  }

  async countUniqueVisitors(entityType: EntityType, entityId: string, since?: Date): Promise<number> {
    const visitors = new Set<string>();
    Array.from(this.pageViews.values())
      .filter(
        pv => pv.entityType === entityType && 
              pv.entityId === entityId &&
              (!since || pv.timestamp >= since)
      )
      .forEach(pv => {
        visitors.add(pv.visitorId ?? pv.sessionId);
      });
    return visitors.size;
  }

  // Helper for testing
  clear(): void {
    this.pageViews.clear();
  }

  // Helper for seeding demo data
  seed(pageViews: PageView[]): void {
    pageViews.forEach(pv => this.pageViews.set(pv.id, pv));
  }
}