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

/**
 * createTransferOrder — app-layer GraphQL mutation. Thin wrapper over erp-kit's
 * native inventory `createTransferOrder` command. The two app-level extension
 * columns (`docNumber`, `notes`) are declared in `modules.ts`; `docNumber` is a
 * DB-assigned serial and `notes` is passed straight through the command header.
 */
export default createResolver({
  name: "createTransferOrder",
  operation: "mutation",
  input: {
    sourceSiteId: t.string().description("Site the goods are dispatched from"),
    destinationSiteId: t.string().description("Site the goods are received at"),
    plannedShipmentDate: t
      .date()
      .description("Planned source-site shipping date used for stock reservation demand"),
    expectedReceiptDate: t
      .date()
      .description("Planned destination-site receiving date used for inbound supply planning"),
    notes: t.string({ optional: true }).description("Operator notes"),
    lines: t
      .object(
        {
          itemId: t.string().description("Item ID"),
          orderedQuantity: t.string().description("Ordered quantity (decimal string, > 0)"),
        },
        { array: true },
      )
      .description("Transfer order lines"),
  },
  body: async (context) => {
    const ctx = createContext(context);
    const db = getDB("main-db");
    return db
      .transaction()
      .execute(async (trx) => {
        const result = await invModulesExport.commands.createTransferOrder(
          trx,
          {
            // erp-kit split create-command input into { header, lines }.
            // The GraphQL input stays flat; we reshape it here.
            header: {
              sourceSiteId: context.input.sourceSiteId,
              destinationSiteId: context.input.destinationSiteId,
              // Anchor date-only inputs at UTC noon (same convention as
              // createPurchaseOrder) so client-side TZ rendering doesn't shift
              // the calendar date by ±1 day.
              plannedShipmentDate: new Date(`${context.input.plannedShipmentDate}T12:00:00.000Z`),
              expectedReceiptDate: new Date(`${context.input.expectedReceiptDate}T12:00:00.000Z`),
              notes: context.input.notes ?? null,
            },
            lines: context.input.lines.map((line) => ({
              itemId: line.itemId,
              orderedQuantity: line.orderedQuantity,
            })),
          },
          ctx,
        );

        if (!result.ok) {
          switch (result.error.code) {
            case "INVENTORY_INVALID_TRANSFER_LOCATIONS":
              throw new DomainError(`Invalid transfer locations: ${result.error.message}`);
            case "INVENTORY_EMPTY_TRANSFER_LINES":
              throw new DomainError("Transfer order must have at least one line");
            case "INVENTORY_INVALID_QUANTITY":
              throw new DomainError(`Invalid quantity: ${result.error.message}`);
            case "INVENTORY_ITEM_NOT_FOUND":
              throw new DomainError(`Item not found: ${result.error.message}`);
            case "INVENTORY_SITE_NOT_FOUND":
              throw new DomainError(`Site not found: ${result.error.message}`);
            case "INVENTORY_CROSS_COMPANY_TRANSFER_NOT_SUPPORTED":
              throw new DomainError(
                "Transfers between sites of different companies are not supported",
              );
            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.transferOrder.id };
      })
      .catch((err: unknown) => {
        if (err instanceof DomainError) throw err;
        throw new Error("Failed to create the transfer order", { cause: err });
      });
  },
  output: t
    .object({
      id: t.string().description("Created transfer order ID"),
    })
    .description("CreateTransferOrder response"),
});