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import { getPubchemIdFromDocument } from '@/helpers/pubchem';
import { ProductBuilder } from '@/utils/ProductBuilder';
import { SupplierBaseShopify } from './SupplierBaseShopify';
/**
* SupplierAsesChem class that extends SupplierBaseShopify.
*
* @remarks
* AsesChem sells cosmetic and personal-care chemical ingredients. Search results come from the
* Shopify GraphQL Storefront API, but the extra product details (SDS/COA documents, description,
* molecular formula, PubChem ID and reviews) are only rendered on the product page HTML, so
* {@link SupplierAsesChem.getProductData} fetches and scrapes that page per product.
*
* @category Suppliers
* @source
*/
export class SupplierAsesChem extends SupplierBaseShopify implements ISupplier {
// Name of supplier (for display purposes)
public static readonly supplierName: string = 'AsesChem';
// Base URL for HTTP(s) requests
public static readonly baseURL: string = 'https://ases.in';
// Shipping scope
public static readonly shipping: ShippingRange = 'domestic';
// The country code of the supplier.
public static readonly country: CountryCode = 'IN';
// The payment methods accepted by the supplier.
public static readonly paymentMethods: PaymentMethod[] = ['mastercard', 'visa'];
// Shopify API URL for GraphQL queries
protected static readonly apiURL: string = 'aseschem.myshopify.com';
/**
* Enriches a search-result product with details only present on its product page. Fetches the
* product page HTML and scrapes the SDS/COA document links, description, molecular formula,
* PubChem ID and review summary, applying each to the builder via its validating setters (any
* missing field is skipped silently).
*
* @param product - The product builder created from the Shopify search response
* @returns Promise resolving to the enriched builder, or void if the page could not be fetched
* @example
* ```typescript
* const partial = (await this.queryProducts("triethanolamine", 1))?.[0];
* const full = partial ? await this.getProductData(partial) : undefined;
* // full?.get("formula") === "C₆H₁₅NO₃"
* // full?.get("sdsUrl") === "https://ases.in/cdn/shop/files/Triethanolamine_-_SDS.pdf?..."
* ```
* @source
*/
protected async getProductData(
product: ProductBuilder<Product>,
): Promise<ProductBuilder<Product> | void> {
return this.getProductDataWithCache(product, async (builder) => {
if (typeof builder === 'undefined') {
this.logger.error('No product to get data for');
return;
}
const productResponse = await this.httpGetHtml({ path: builder.get('url') });
if (!productResponse) {
this.logger.warn('No product page response', { builder });
return builder;
}
const parser = new DOMParser();
const doc = parser.parseFromString(productResponse, 'text/html');
this.applyDocuments(builder, doc);
this.applyDescriptionDetails(builder, doc);
this.applyImages(builder, doc);
this.applyReviews(builder, doc);
return builder;
});
}
/**
* Scrapes the SDS/COA document links (pdf/doc only) from the product page and applies them to the
* builder. Matches links by their visible text: text containing "coa" sets the COA URL, text
* containing "sds" (including "MSDS") sets the SDS URL.
*
* @param builder - The product builder to populate
* @param doc - The parsed product page document
* @returns void
* @example
* ```typescript
* this.applyDocuments(builder, doc);
* // builder.get("sdsUrl") -> "https://ases.in/cdn/shop/files/Triethanolamine_-_SDS.pdf?..."
* ```
* @source
*/
private applyDocuments(builder: ProductBuilder<Product>, doc: Document): void {
const links = doc.querySelectorAll<HTMLAnchorElement>(
'div[class^="product-detail"] a[href*="pdf"], div[class^="product-detail"] a[href*="doc"]',
);
for (const link of links) {
const text = (link.textContent ?? '').toLowerCase();
const href = link.getAttribute('href');
if (text.includes('coa')) {
builder.setCoaUrl(href);
} else if (text.includes('sds')) {
builder.setSDSUrl(href);
}
}
}
/**
* Scrapes the product description block and applies the description, molecular formula, PubChem
* CID, CAS number and molecular weight to the builder. Labelled layouts expose the description and
* formula in their own `<strong>`-tagged paragraphs; the CAS and molecular weight are pulled from
* the block's full text, which also covers the plain-text layout (e.g. "CAS No. 27028-82-6
* Formula: C18H41NO7S M.W. 415.6").
*
* @param builder - The product builder to populate
* @param doc - The parsed product page document
* @returns void
* @example
* ```typescript
* this.applyDescriptionDetails(builder, doc);
* // builder.get("formula") -> "C₆H₁₅NO₃", builder.get("cas") -> "27028-82-6"
* ```
* @source
*/
private applyDescriptionDetails(builder: ProductBuilder<Product>, doc: Document): void {
const container = doc.querySelector('div.product-description');
if (!container) return;
const paragraphs = Array.from(container.querySelectorAll(':scope > p'));
const labelMatches = (paragraph: Element, label: string): boolean =>
(paragraph.querySelector('strong')?.textContent ?? '').toLowerCase().includes(label);
const descriptionParagraph = paragraphs.find((p) => labelMatches(p, 'description'));
if (descriptionParagraph) {
const label = descriptionParagraph.querySelector('strong')?.textContent ?? '';
const full = descriptionParagraph.textContent ?? '';
const description = (full.startsWith(label) ? full.slice(label.length) : full)
.replace(/^[\s\-–—:]+/, '')
.trim();
builder.setDescription(description);
}
const formulaParagraph = paragraphs.find((p) => labelMatches(p, 'molecular formula'));
if (formulaParagraph) {
// The formula text carries <sub> markup (e.g. C<sub>6</sub>H<sub>15</sub>NO<sub>3</sub>),
// which setFormula parses into unicode subscripts, so pass innerHTML rather than textContent.
const formulaSource =
formulaParagraph.querySelector('a') ?? formulaParagraph.querySelector('span');
builder.setFormula(formulaSource?.innerHTML);
const pubchemHref = formulaParagraph.querySelector('a')?.getAttribute('href');
if (pubchemHref) {
const cid = pubchemHref?.match(/\/compound\/(\d+)/i)?.[1];
builder.setPubchemId(cid);
} else {
const pubchemLinkSearch = getPubchemIdFromDocument(doc);
if (pubchemLinkSearch) {
builder.setPubchemId(pubchemLinkSearch);
}
}
}
// CAS and molecular weight appear inline in the block text (setCAS validates the checksum).
const text = container.textContent ?? '';
builder.setCAS(findCAS(text));
builder.setMoleweight(text.match(/M\.?\s*W\.?\s*[:-]?\s*([\d.]+)/i)?.[1]);
}
/**
* Scrapes the main product image from the product page and applies both the full-size image and a
* downsized thumbnail to the builder. Both are derived from the same
* `a.main-img-link img.rimage__image` source (sized at 1024px and 150px respectively).
*
* @param builder - The product builder to populate
* @param doc - The parsed product page document
* @returns void
* @example
* ```typescript
* this.applyImages(builder, doc);
* // builder.get("images") -> [{ url: "https://ases.in/cdn/shop/products/Triethanolamine_1024x.jpg?...", thumbnail: "https://ases.in/cdn/shop/products/Triethanolamine_150x.jpg?..." }]
* ```
* @source
*/
private applyImages(builder: ProductBuilder<Product>, doc: Document): void {
const mainImage = doc.querySelector<HTMLImageElement>('a.main-img-link img.rimage__image');
if (!mainImage) return;
builder.setImage(this.resolveImageSrc(mainImage, 1024), mainImage.getAttribute('alt'));
builder.setThumbnail(this.resolveImageSrc(mainImage, 150));
}
/**
* Resolves a usable image URL from a lazy-loaded `<img>` at the given width. Prefers `src`,
* falling back to `data-lazy-src` / `data-src`, and replaces the `{width}` size token Shopify's
* responsive markup leaves in the lazy source with the requested width.
*
* @param img - The image element to read the source from
* @param width - The pixel width to substitute for the `{width}` token
* @returns The resolved image URL, or undefined if no source attribute is present
* @example
* ```typescript
* // <img data-lazy-src="//cdn/shop/x_{width}x.jpg">
* this.resolveImageSrc(img, 150); // "//cdn/shop/x_150x.jpg"
* ```
* @source
*/
private resolveImageSrc(img: HTMLImageElement, width: number): string | undefined {
const raw =
img.getAttribute('src') || img.getAttribute('data-lazy-src') || img.getAttribute('data-src');
return raw?.replace('{width}', String(width)) ?? undefined;
}
/**
* Scrapes the review summary (average rating and review count) from the Judge.me review widget
* and applies it to the builder.
*
* @param builder - The product builder to populate
* @param doc - The parsed product page document
* @returns void
* @example
* ```typescript
* this.applyReviews(builder, doc);
* // builder.get("rating") -> 4.57, builder.get("reviewCount") -> 14
* ```
* @source
*/
private applyReviews(builder: ProductBuilder<Product>, doc: Document): void {
const widget = doc.querySelector('.jdgm-rev-widg');
if (!widget) return;
builder.setRating(widget.getAttribute('data-average-rating'));
builder.setReviewCount(widget.getAttribute('data-number-of-reviews'));
}
}
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