import type { DatabaseContext } from "../db/database";
import { canCancelOrder } from "./order-status";
import { appendAuditEvent, findOrderDetail, updateOrderStatus } from "./order-repository";

export async function cancelOrder(
  context: DatabaseContext,
  input: {
    orderId: string;
    actor: string;
    reason?: string;
  }
) {
  const order = await findOrderDetail(context, input.orderId);

  if (!order) {
    return { statusCode: 404, message: "Order not found." } as const;
  }

  if (!canCancelOrder(order.status)) {
    return { statusCode: 400, message: "Order cannot be cancelled for this order status." } as const;
  }

  const updatedAt = new Date().toISOString();
  await updateOrderStatus(context, input.orderId, "cancelled", updatedAt);
  await appendAuditEvent(context, {
    orderId: input.orderId,
    actor: input.actor,
    type: "order.cancelled",
    message: input.reason?.trim() ? `Cancelled order. Reason: ${input.reason.trim()}` : "Cancelled order.",
    createdAt: updatedAt
  });

  return {
    statusCode: 200,
    order: await findOrderDetail(context, input.orderId)
  } as const;
}