import type {NextRequest} from 'next/server';
import {engagementApi} from '@/services/api/engagementApi';
import {toReportWindow, toSiteParam} from '@/services/api/range';
import {serveUpstream} from '@/shared/services/bff';
import {toJourney} from '@/features/engagement/services/mapEngagement';

export const dynamic = 'force-dynamic';

/**
 * GET /api/reports/journey — visit → take part → buy → come back → refer.
 *
 * Distinct people per stage. Not a strict funnel, and the panel says so.
 */
export async function GET(req: NextRequest) {
  return serveUpstream(req, async (token, query) => {
    const window = toReportWindow(query.range, new Date(query.nowMs));
    return toJourney(
      await engagementApi.journey(token, window, toSiteParam(query.storeId)),
    );
  });
}