import type { EvidenceSignal } from "../api/types";

type TFunction = (key: string, options?: Record<string, unknown>) => string;

// The backend never emits prose for data-quality evidence -- only stable signal codes
// plus raw data params (see backend/app/services/data_quality.py::_open_issue). This is
// the one place that turns them into the operator's selected language, shared by the
// issue detail page and the dashboard attention queue so the same code always reads the
// same way everywhere it appears.
export function describeEvidenceSignal(
  t: TFunction,
  formatNumber: (value: number) => string,
  signal: EvidenceSignal,
): string {
  const { code, params = {} } = signal;
  if (code.startsWith("vehicle.")) {
    return t(`quality:detail.vehicleStatusConflict.reasonCodes.${code}`, { defaultValue: code });
  }
  switch (code) {
    case "missing_field":
      return t("quality:detail.evidence.missingField", {
        field: t(`quality:detail.missingField.fields.${params.field}`, { defaultValue: String(params.field) }),
      });
    case "overlap.reserved_bookings":
      return t("quality:detail.evidence.overlapReservedBookings", {
        refs: Array.isArray(params.refs) ? params.refs.join(" ↔ ") : "",
      });
    case "odometer.regression":
      return t("quality:detail.evidence.odometerRegression", {
        laterRef: params.later_ref,
        laterKm: formatNumber(Number(params.later_km ?? 0)),
        earlierRef: params.earlier_ref,
        earlierKm: formatNumber(Number(params.earlier_km ?? 0)),
      });
    case "duplicate.similar_name":
      return t("quality:detail.evidence.duplicateSimilarName", { score: params.score });
    case "attention.upcoming_booking_missing_inspection":
      return t("quality:detail.evidence.upcomingBookingMissingInspection", { bookingRef: params.booking_ref });
    default:
      return t(`quality:detail.evidence.${code}`, { defaultValue: code });
  }
}