product_inventory/src/ProductLogic.test.ts

import { Product } from "./Product";
import { MockSpreadsheetService } from "./services/MockSpreadsheetService";
import { MockShop } from "./test/MockShop";

describe("Product Logic (TDD)", () => {
  let mockService: MockSpreadsheetService;
  let mockShop: MockShop;

  beforeEach(() => {
    mockService = new MockSpreadsheetService({
      product_inventory: [
        ["sku", "title", "price", "shopify_id", "product_type"], // Headers
        ["TEST-SKU-1", "Test Product", 10.99, "", "Type A"] // Data
      ],
      values: [
          ["product_type", "shopify_category", "ebay_category_id"],
          ["Type A", "Category A", "123"]
      ]
    });
    mockShop = new MockShop();
  });

  test("UpdateShopifyProduct should abort if SKU is invalid", () => {
    // Setup invalid SKU
    mockService.setSheetData("product_inventory", [
        ["sku", "title"],
        ["?", "Invalid Product"]
    ]);
    // Allow empty sku to be passed to constructor logic check, but Product constructor throws if sku not found.
    // So we pass a valid sku that exists in sheet, but looks invalid?
    // The requirement is "based on the product's title... If I have a placeholder value... ensure products are not created until they have a valid SKU".
    // In `Product.ts`, constructor takes `sku`.
    // If I pass `?` and it's in the sheet, it constructs.

    const product = new Product("?", mockService);

    // Attempt update
    product.UpdateShopifyProduct(mockShop);

    // Verify no calls to creating product
    // We expect MatchToShopifyProduct might be called (read only), but NOT productSet (writ)
    // Actually our plan said "abort operation" at start of UpdateShopifyProduct.
    expect(mockShop.productSetCalledWith).toBeNull();
  });

  test("ToShopifyProductSet should set handle to SKU", () => {
    const product = new Product("TEST-SKU-1", mockService);
    const sps = product.ToShopifyProductSet();

    // We expect sps to have a 'handle' property equal to the sku
    // This will fail compilation initially as ShopifyProductSetInput doesn't have handle
    expect((sps as any).handle).toBe("TEST-SKU-1");
  });

  test("MatchToShopifyProduct should verify ID if present", () => {
    // Setup data with shopify_id
    mockService.setSheetData("product_inventory", [
        ["sku", "shopify_id"],
        ["TEST-SKU-OLD", "123456789"]
    ]);
    const product = new Product("TEST-SKU-OLD", mockService);

    // Mock the response for GetProductById
    mockShop.mockProductById = {
        id: "123456789",
        title: "Old Title",
        variants: { nodes: [{ id: "gid://shopify/ProductVariant/123456789", sku: "TEST-SKU-OLD" }] },
        options: [{ id: "opt1", optionValues: [{ id: "optval1" }] }]
    };

    // We need to call Match, but it's called inside Update usually.
    // We can call it directly for testing.
    product.MatchToShopifyProduct(mockShop);

    // Expect GetProductById to have been called
    expect(mockShop.getProductByIdCalledWith).toBe("123456789");
    expect(product.shopify_id).toBe("123456789");
  });

  test("MatchToShopifyProduct should fall back to SKU if ID lookup fails", () => {
    // Setup data with shopify_id that is invalid
    mockService.setSheetData("product_inventory", [
        ["sku", "shopify_id"],
        ["TEST-SKU-FAIL", "999999999"]
    ]);
    const product = new Product("TEST-SKU-FAIL", mockService);

    // Mock ID lookup failure (returns null/undefined)
    mockShop.mockProductById = null;

    // Mock SKU lookup success
    mockShop.mockProductBySku = {
        id: "555555555",
        title: "Found By SKU",
        variants: { nodes: [{ id: "gid://shopify/ProductVariant/555555555", sku: "TEST-SKU-FAIL" }] },
        options: [{ id: "opt2", optionValues: [{ id: "optval2" }] }]
    };

    product.MatchToShopifyProduct(mockShop);

    expect(mockShop.getProductByIdCalledWith).toBe("999999999");
    // Should fall back to SKU
    expect(mockShop.getProductBySkuCalledWith).toBe("TEST-SKU-FAIL");
    expect(product.shopify_id).toBe("555555555");
  });
});