'use client';

import type { GetDashboardDataOutputDTO } from '@/lib/types/generated/GetDashboardDataOutputDTO';
import type { AnalyticsDashboardViewData } from '@/lib/view-data/AnalyticsDashboardViewData';
import type { ViewDataBuilder } from '@/lib/contracts/builders/ViewDataBuilder';

export class AnalyticsDashboardViewDataBuilder {
  public static build(apiDto: GetDashboardDataOutputDTO): AnalyticsDashboardViewData {
    const totalUsers = apiDto.totalUsers;
    const activeUsers = apiDto.activeUsers;
    const totalRaces = apiDto.totalRaces;
    const totalLeagues = apiDto.totalLeagues;

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

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

AnalyticsDashboardViewDataBuilder satisfies ViewDataBuilder<GetDashboardDataOutputDTO, AnalyticsDashboardViewData>;