import { createContext, DomainError } from "@tailor-platform/erp-kit/app";
import { createResolver, t } from "@tailor-platform/sdk";
import { getDB } from "@/generated/kysely-tailordb";
import { purchaseModules } from "@/modules";

export default createResolver({
  name: "createPurchaseOrder",
  operation: "mutation",
  input: {
    companyId: t.string().description("Company ID"),
    currencyId: t
      .string()
      .description("Transaction currency, which must be the company's base currency"),
    supplierAccountId: t.string().description("Supplier account ID"),
    orderDate: t.string().description("Order date (ISO 8601)"),
    receivingSiteId: t
      .string({ optional: true })
      .description("Default receiving site for all lines"),
    externalSupplierOrderReference: t
      .string({ optional: true })
      .description("External supplier order reference"),
    lines: t
      .object(
        {
          itemId: t.string().description("Item ID"),
          quantity: t.string().description("Quantity"),
          unitPrice: t.string().description("Unit price"),
          unitId: t.string().description("Unit ID"),
          receivingSiteId: t.string({ optional: true }).description("Receiving site ID"),
        },
        { array: true },
      )
      .description("Order lines"),
  },
  body: async (context) => {
    const ctx = createContext(context);
    const db = getDB("main-db");
    return db
      .transaction()
      .execute(async (trx) => {
        const result = await purchaseModules.commands.createPurchaseOrder(
          trx,
          {
            // erp-kit 0.39 split create-command input into { header, lines }.
            // The GraphQL input stays flat; we reshape it here.
            header: {
              companyId: context.input.companyId,
              currencyId: context.input.currencyId,
              supplierAccountId: context.input.supplierAccountId,
              orderDate: new Date(context.input.orderDate),
              receivingSiteId: context.input.receivingSiteId ?? undefined,
              externalSupplierOrderReference:
                context.input.externalSupplierOrderReference ?? undefined,
            },
            lines: context.input.lines.map((line) => ({
              itemId: line.itemId,
              quantity: line.quantity,
              unitPrice: line.unitPrice,
              unitId: line.unitId,
              receivingSiteId: line.receivingSiteId ?? undefined,
            })),
          },
          ctx,
        );

        if (!result.ok) {
          switch (result.error.code) {
            case "PURCHASE_COMPANY_NOT_FOUND":
              throw new DomainError(`Company not found: ${context.input.companyId}`);
            case "PURCHASE_CURRENCY_MISMATCH":
              throw new DomainError(
                `Currency is not the company's base currency: ${context.input.currencyId}`,
              );
            case "PURCHASE_SUPPLIER_NOT_FOUND":
              throw new DomainError(`Supplier not found: ${context.input.supplierAccountId}`);
            case "PURCHASE_SUPPLIER_NOT_ACTIVE":
              throw new DomainError(`Supplier is not active: ${context.input.supplierAccountId}`);
            case "PURCHASE_SUPPLIER_ACCOUNT_COMPANY_MISMATCH":
              throw new DomainError("The supplier account belongs to a different company.");
            case "PURCHASE_EMPTY_PURCHASE_ORDER_LINES":
              throw new DomainError("Purchase order must have at least one line");
            case "PURCHASE_ITEM_NOT_FOUND":
              throw new DomainError(`Item not found: ${result.error.message}`);
            case "PURCHASE_ITEM_NOT_ACTIVE":
              throw new DomainError(`Item is not active: ${result.error.message}`);
            case "PURCHASE_ITEM_NOT_PURCHASABLE":
              throw new DomainError(`Item has no purchasing record: ${result.error.message}`);
            case "PURCHASE_INVALID_QUANTITY":
              throw new DomainError(`Invalid quantity: ${result.error.message}`);
            case "PURCHASE_INVALID_UNIT_PRICE":
              throw new DomainError(`Invalid unit price: ${result.error.message}`);
            case "PURCHASE_RECEIVING_SITE_NOT_FOUND":
              throw new DomainError(`Receiving site not found: ${result.error.message}`);
            case "PURCHASE_RECEIVING_SITE_REQUIRED":
              throw new DomainError(`Receiving site is required for line: ${result.error.message}`);
            case "UNAUTHENTICATED":
              throw new DomainError("Authentication is required");
            case "INSUFFICIENT_PERMISSION":
              throw new DomainError("You do not have permission to perform this action");
            default:
              throw result.error satisfies never;
          }
        }

        return { id: result.value.purchaseOrderId };
      })
      .catch((err: unknown) => {
        if (err instanceof DomainError) throw err;
        throw new Error("Failed to create the purchase order", { cause: err });
      });
  },
  output: t
    .object({
      id: t.string().description("Created purchase order ID"),
    })
    .description("CreatePurchaseOrder response"),
});