import { AnalyticsDashboardInputViewData } from '@/lib/view-data/AnalyticsDashboardInputViewData';
import { AnalyticsDashboardViewData } from '@/lib/view-data/AnalyticsDashboardViewData';

/**
 * AnalyticsDashboardViewDataBuilder
 *
 * Transforms AnalyticsDashboardInputViewData into AnalyticsDashboardViewData for server-side rendering.
 * Deterministic; side-effect free; no HTTP calls.
 */
import { ViewDataBuilder } from "../../contracts/builders/ViewDataBuilder";

export class AnalyticsDashboardViewDataBuilder implements ViewDataBuilder<any, any> {
  build(input: any): any {
    return AnalyticsDashboardViewDataBuilder.build(input);
  }

  static build(viewData: AnalyticsDashboardInputViewData): AnalyticsDashboardViewData {
    const userEngagementRate = viewData.totalUsers > 0 ? (viewData.activeUsers / viewData.totalUsers) * 100 : 0;
    const formattedEngagementRate = `${userEngagementRate.toFixed(1)}%`;
    const activityLevel = userEngagementRate > 70 ? 'High' : userEngagementRate > 40 ? 'Medium' : 'Low';

    return {
      metrics: {
        totalUsers: viewData.totalUsers,
        activeUsers: viewData.activeUsers,
        totalRaces: viewData.totalRaces,
        totalLeagues: viewData.totalLeagues,
        userEngagementRate,
        formattedEngagementRate,
        activityLevel,
      },
    };
  }
}