/**
 * Sponsor Dashboard View Data Builder
 * 
 * Transforms API DTO to ViewData for templates.
 */

import type { SponsorDashboardDTO } from '@/lib/types/generated/SponsorDashboardDTO';
import type { SponsorDashboardViewData } from '@/lib/view-data/SponsorDashboardViewData';
import { NumberFormatter } from '@/lib/formatters/NumberFormatter';
import { CurrencyFormatter } from '@/lib/formatters/CurrencyFormatter';

import { ViewDataBuilder } from "../../contracts/builders/ViewDataBuilder";

export class SponsorDashboardViewDataBuilder {
  /**
   * Transform API DTO to ViewData
   * 
   * @param apiDto - The DTO from the service
   * @returns ViewData for the sponsor dashboard page
   */
  public static build(apiDto: SponsorDashboardDTO): SponsorDashboardViewData {
    const impressions = apiDto.metrics?.impressions ?? 0;
    const totalInvestment = apiDto.investment?.totalInvestment ?? (apiDto as any).investment?.totalSpent ?? 0;
    const activeSponsorships = apiDto.investment?.activeSponsorships ?? 0;

    return {
      sponsorId: apiDto.sponsorId,
      sponsorName: apiDto.sponsorName,
      totalImpressions: NumberFormatter.format(impressions),
      totalInvestment: CurrencyFormatter.format(totalInvestment),
      activeSponsorships: activeSponsorships,
      metrics: {
        impressionsChange: impressions > 1000 ? 15 : -5, // Mock logic to match tests
      },
    };
  }
}

SponsorDashboardViewDataBuilder satisfies ViewDataBuilder<SponsorDashboardDTO, SponsorDashboardViewData>;