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

export default createResolver({
  name: "createItem",
  operation: "mutation",
  input: {
    sku: t.string().description("Stock keeping unit"),
    name: t.string().description("Item name"),
    barcode: t.string({ optional: true }).description("Barcode"),
    unitId: t.string().description("Unit of measure ID"),
  },
  body: async (context) => {
    const ctx = createContext(context);
    const db = getDB("main-db");
    return db
      .transaction()
      .execute(async (trx) => {
        // Step 1: Create item (starts in DRAFT state)
        const result1 = await imModulesExport.commands.createItem(
          trx,
          {
            sku: context.input.sku,
            name: context.input.name,
            barcode: context.input.barcode ?? undefined,
            unitId: context.input.unitId,
          },
          ctx,
        );

        if (!result1.ok) {
          switch (result1.error.code) {
            case "ITEM_MANAGEMENT_DUPLICATE_SKU":
              throw new DomainError(`Duplicate SKU: ${context.input.sku}`);
            case "ITEM_MANAGEMENT_DUPLICATE_BARCODE":
              throw new DomainError(`Duplicate barcode: ${context.input.barcode}`);
            case "ITEM_MANAGEMENT_UNIT_NOT_FOUND":
              throw new DomainError(`Unit not found: ${context.input.unitId}`);
            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 result1.error satisfies never;
          }
        }

        const itemId = result1.value.item.id;

        // Step 2: Activate item
        const result2 = await imModulesExport.commands.activateItem(trx, { id: itemId }, ctx);

        if (!result2.ok) {
          switch (result2.error.code) {
            case "ITEM_MANAGEMENT_ITEM_NOT_FOUND":
              throw new DomainError(`Item not found: ${itemId}`);
            case "ITEM_MANAGEMENT_INVALID_STATE_TRANSITION":
              throw new DomainError(`Invalid state transition for item: ${itemId}`);
            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 result2.error satisfies never;
          }
        }

        return { id: result1.value.item.id };
      })
      .catch((err: unknown) => {
        if (err instanceof DomainError) throw err;
        throw new Error("Failed to create the item", { cause: err });
      });
  },
  output: t
    .object({
      id: t.string().description("Created item ID"),
    })
    .description("Created item"),
});