/**
 * Analytics metrics view model
 * Represents metrics data for analytics
 *
 * Accepts AnalyticsMetricsViewData as input and produces UI-ready data.
 */
import { DurationFormatter } from "@/lib/formatters/DurationFormatter";
import { NumberFormatter } from "@/lib/formatters/NumberFormatter";
import { PercentFormatter } from "@/lib/formatters/PercentFormatter";
import { ViewModel } from "../contracts/view-models/ViewModel";
import { AnalyticsMetricsViewData } from "../view-data/AnalyticsMetricsViewData";

export class AnalyticsMetricsViewModel extends ViewModel {
  private readonly data: AnalyticsMetricsViewData;

  constructor(data: AnalyticsMetricsViewData) {
    super();
    this.data = data;
  }

  get pageViews(): number { return this.data.pageViews; }
  get uniqueVisitors(): number { return this.data.uniqueVisitors; }
  get averageSessionDuration(): number { return this.data.averageSessionDuration; }
  get bounceRate(): number { return this.data.bounceRate; }

  /** UI-specific: Formatted page views */
  get formattedPageViews(): string {
    return NumberFormatter.format(this.pageViews);
  }

  /** UI-specific: Formatted unique visitors */
  get formattedUniqueVisitors(): string {
    return NumberFormatter.format(this.uniqueVisitors);
  }

  /** UI-specific: Formatted session duration */
  get formattedSessionDuration(): string {
    return DurationFormatter.formatSeconds(this.averageSessionDuration);
  }

  /** UI-specific: Formatted bounce rate */
  get formattedBounceRate(): string {
    return PercentFormatter.format(this.bounceRate);
  }
}