import type { Prisma } from "@prisma/client";
import { formatCurrency } from "@/lib/utils";

// Human-readable labels for each POAction type, shown in the PO Activity timeline.
export const ACTION_LABELS: Record<string, string> = {
  CREATED: "Created",
  SUBMITTED: "Submitted for review",
  APPROVED: "Approved",
  APPROVED_WITH_NOTE: "Approved with note",
  REJECTED: "Rejected",
  EDITS_REQUESTED: "Edits requested",
  VENDOR_ID_REQUESTED: "Vendor ID requested",
  VENDOR_ID_PROVIDED: "Vendor ID provided",
  PAYMENT_SENT: "Payment confirmed",
  PARTIAL_PAYMENT_CONFIRMED: "Partial payment confirmed",
  RECEIPT_CONFIRMED: "Receipt confirmed",
  PARTIAL_RECEIPT_CONFIRMED: "Partial receipt confirmed",
  CLOSED: "Closed",
  MANAGER_LINE_EDIT: "Manager amended line items",
  PRODUCT_PRICE_UPDATED: "Product prices updated",
  CANCELLED: "Cancelled",
  SUPERSEDED: "Superseded",
};

// Produce the Activity-timeline label for an action. Most actions use the static
// ACTION_LABELS map; PARTIAL_PAYMENT_CONFIRMED interpolates the instalment amount
// from the action's metadata (already persisted by markPaid) — issue #140.
export function actionLabel(
  action: { actionType: string; metadata: Prisma.JsonValue },
  currency: string,
): string {
  const fallback = ACTION_LABELS[action.actionType] ?? action.actionType;
  if (action.actionType === "PARTIAL_PAYMENT_CONFIRMED") {
    const amount = (action.metadata as { paymentAmount?: unknown } | null)?.paymentAmount;
    if (typeof amount === "number" && Number.isFinite(amount)) {
      return `Partial payment of ${formatCurrency(amount, currency)} confirmed`;
    }
  }
  return fallback;
}