export const PurchaseOrder = entity("purchase_order", {
  description: "An order to a supplier. Over £5,000 it needs a finance approver.",
  properties: {
    status: p.select(PO_STATUS, { default: "draft", managed: true }),
    totalMinor: p.integer({ min: 0 }),
  },
  relationships: {
    supplier: rel.one("supplier", { inverse: "purchaseOrders" }),
    raisedBy: rel.one(User, { inverse: "raisedPurchaseOrders" }),
  },
}).actions((self) => ({
  approve: action({
    description: "Approve a draft order. Nobody approves their own.",
    input: Schema.Struct({ order: self.ref }),
    handler: ({ input, principal }) =>
      Effect.gen(function* () {
        const order = yield* self.get(input.order, { forUpdate: true });
        if (order.raisedById === principal.id)
          return yield* reject("Nobody approves their own order.");
        if (order.totalMinor > 500_000 && !principal.roles.includes("finance"))
          return yield* reject("Over £5,000 needs a finance approver.");
        yield* self.update(order, { status: "approved" });
      }),
  }),
}));