function toIsoString(value) {
  return value instanceof Date ? value.toISOString() : value;
}

export function toAdminPricingObservationDto(observation) {
  return {
    id: observation.id,
    productId: observation.productId,
    inventoryItemId: observation.inventoryItemId,
    providerId: observation.providerId,
    priceMinor: observation.priceMinor,
    currency: observation.currency,
    sourceIdentifier: observation.sourceIdentifier,
    conditionId: observation.conditionId,
    sourceUrl: observation.sourceUrl ?? null,
    qualityScore: observation.qualityScore ?? null,
    isOutlier: observation.isOutlier,
    outlierReason: observation.outlierReason ?? null,
    observedAt: toIsoString(observation.observedAt),
  };
}

export function toAdminMarketValuationDto({ valuation, observations }) {
  return {
    id: valuation.id,
    inventoryItemId: valuation.inventoryItemId,
    valueMinor: valuation.valueMinor,
    currency: valuation.currency,
    strategy: valuation.strategy,
    confidence: valuation.confidence,
    sourceCount: valuation.sourceCount,
    calculatedAt: toIsoString(valuation.calculatedAt),
    stale:
      Date.now() - new Date(valuation.calculatedAt).getTime() >
      7 * 24 * 60 * 60 * 1000,
    observations: observations.map(toAdminPricingObservationDto),
  };
}