export function createDashboardService({ productService, inventoryItemService, listingService, saleService, acquisitionService, pricingRepository }) {
  return {
    async get({ sellerId }) {
      const [products, inventory, listings, sales, acquisitions, valuations] = await Promise.all([
        productService.listBySellerId(sellerId),
        inventoryItemService.listBySellerId(sellerId),
        listingService.list({ sellerId }),
        saleService.list({ sellerId }),
        acquisitionService.list({ sellerId }),
        pricingRepository?.listLatestValuationsForSeller(sellerId) ?? [],
      ]);

      const activeListings = listings.filter(({ status }) => ['AVAILABLE', 'PENDING'].includes(status));
      const completedSales = sales.filter(({ status }) => status !== 'VOIDED');
      const valuationByItem = new Map(valuations.map((valuation) => [valuation.inventoryItemId, valuation]));
      const staleThreshold = 7 * 24 * 60 * 60 * 1000;
      const total = (values, field) => values.reduce((sum, value) => sum + (value[field] ?? 0), 0);

      return {
        counts: {
          products: products.length,
          inventory: inventory.length,
          activeInventory: inventory.filter(({ status }) => status === 'ACTIVE').length,
          soldInventory: inventory.filter(({ status }) => status === 'SOLD').length,
          availableListings: activeListings.length,
          sales: completedSales.length,
          acquisitions: acquisitions.length,
          missingImages: listings.filter(({ imageCount }) => imageCount < 1).length,
          missingPricing: inventory.filter(({ id }) => !valuationByItem.has(id)).length,
          stalePricing: valuations.filter(({ calculatedAt }) => Date.now() - new Date(calculatedAt).getTime() > staleThreshold).length,
        },
        financials: {
          totalAcquisitionCostMinor: total(acquisitions, 'costBasisMinor'),
          totalAskingValueMinor: total(activeListings, 'askingPriceMinor'),
          totalNetSaleProceedsMinor: total(completedSales, 'netProceedsMinor'),
          totalProfitMinor: total(completedSales, 'profitMinor'),
          totalMarketValueMinor: total([...valuationByItem.values()], 'valueMinor'),
        },
        recentSales: completedSales.slice(0, 5),
        recentAcquisitions: acquisitions.slice(0, 5),
      };
    },
  };
}