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import { parseQuantity } from '@/helpers/quantity';
import { createDOM } from '@/helpers/request';
import { mapDefined } from '@/helpers/utils';
import { ProductBuilder } from '@/utils/ProductBuilder';
import { isCurrencyCode } from '@/utils/typeGuards/common';
import { WRatio } from 'fuzzball';
import { SupplierBase } from './SupplierBase';
import { getErrorMessage, isExpectedAbort } from '@/helpers/exceptions';
/**
* Supplier implementation for S3 Chemicals, a German based chemical supplier
* (shop.es-drei.de) built on the Shopware 5 platform.
*
* Price currency is not hardcoded — the storefront serves either EUR or USD
* depending on session detection, so the currency is always read from the
* `meta[itemprop="priceCurrency"]` tag on the detail page (with the visible
* symbol inferred from the rendered price text).
*
* @typeParam S - The supplier-specific product type (Partial<Product>)
* @typeParam T - The common Product type that all suppliers map to
*
* @example
* ```typescript
* const supplier = new SupplierS3Chemicals("eosin", 10, new AbortController());
* for await (const product of supplier) {
* console.log("Found product:", product.title, product.price);
* }
* ```
* @source
*/
export class SupplierS3Chemicals
extends SupplierBase<Partial<Product>, Product>
implements ISupplier
{
// Display name of the supplier used for UI and logging
public static readonly supplierName: string = 'S3 Chemicals';
// Base URL for all web requests to S3 Chemicals
public static readonly baseURL: string = 'https://shop.es-drei.de';
// Shipping scope for S3 Chemicals (DE-based, ships across borders)
public static readonly shipping: ShippingRange = 'international';
// The country code of the supplier.
// This is used to determine the currency and other country-specific information.
public static readonly country: CountryCode = 'DE';
// The payment methods accepted by the supplier.
public static readonly paymentMethods: PaymentMethod[] = ['mastercard', 'visa', 'ach'];
// German-language titles rarely overlap the English query tokens, so we
// use WRatio (a best-of-several-scorers heuristic) with a low cutoff to
// keep cross-language matches from being discarded.
protected readonly fuzzScorer = WRatio;
protected readonly minMatchPercentage: number = 50;
// Cached search results from the last query execution
protected queryResults: Array<Partial<Product>> = [];
// Maximum number of HTTP requests allowed per search query.
// Raised above the usual 50 because each product fans out to one
// request per variant (typically 3–6) on top of the base detail fetch.
protected httpRequestHardLimit: number = 150;
// Counter for HTTP requests made during current query execution
protected httpRequstCount: number = 0;
// Number of requests to process in parallel when fetching product details
protected maxConcurrentRequests: number = 5;
// Seed Shopware's `currency=2` cookie into the browser jar before any
// request runs so the storefront returns USD prices. The `Cookie` request
// header is fetch-forbidden, so the jar (seeded via chrome.cookies) is the
// only reliable path — see SupplierBase.seedRequiredCookies.
protected readonly requiredCookies: SupplierCookieSeed[] = [{ name: 'currency', value: '2' }];
/**
* Derives the unique product key from an S3 Chemicals search-result card: its
* `data-ordernumber` (the Shopware ordernumber, the same value passed to
* `.setID`). Falls back to the product page href when the wrapper omits the
* ordernumber, so the key is always a non-empty string.
* @param data - The raw S3 Chemicals product-card Element
* @returns The card's ordernumber, or its href when the ordernumber is absent
* @example
* ```typescript
* this.getUniqueProductKey(element); // "S100210"
* ```
* @source
*/
protected getUniqueProductKey(data: Element): string {
const ordernumber = data.getAttribute('data-ordernumber');
if (ordernumber) {
return ordernumber;
}
const href = data.querySelector('a.product--title')?.getAttribute('href') ?? '';
return this.href(href);
}
/**
* Normalizes a Shopware-rendered price string (German locale) into a
* format that `parsePrice` can consume unambiguously.
* Shopware serves numbers as `2.449,00 $` (period = thousands,
* comma = decimal) regardless of the selected currency, so the `$` symbol
* and the German digit formatting disagree. Strip the footnote `*`, the
* non-breaking space, the thousands `.`, and swap the decimal `,` to `.`.
*
* @param text - Raw price text from the DOM (e.g. `"2.449,00\u00A0$ *"`)
* @returns Normalized string safe for `parsePrice` (e.g. `"2449.00 $"`)
* @example
* ```typescript
* this.normalizePriceText("12,25\u00A0$ *"); // "12.25 $"
* this.normalizePriceText("2.449,00\u00A0$"); // "2449.00 $"
* ```
* @source
*/
protected normalizePriceText(text: string): string {
return text
.replace(/\u00A0/g, ' ')
.replace(/\*/g, '')
.replace(/\./g, '')
.replace(',', '.')
.trim();
}
/**
* Queries S3 Chemicals products based on a search string.
* Makes a GET request to the Shopware `/search` endpoint asking for the
* largest allowed page size (n=48) and parses the HTML response to extract
* basic product information from each `.product--box` card.
*
* @param query - The search term to query products for
* @param limit - The maximum number of results to query for
* @returns Promise resolving to an array of ProductBuilder instances or void if search fails
* @example
* ```typescript
* const supplier = new SupplierS3Chemicals("eosin", 10, new AbortController());
* const results = await supplier.queryProducts("eosin");
* if (results) {
* console.log(`Found ${results.length} products`);
* console.log("First product:", results[0].get("title"));
* }
* ```
* @source
*/
protected async queryProducts(
query: string,
limit: number = this.limit,
): Promise<ProductBuilder<Product>[] | void> {
const searchRequest = await this.httpGetHtml({
path: '/search',
params: {
sSearch: encodeURIComponent(query),
p: 1,
// Shopware's per-page size is restricted to one of {12, 24, 36, 48}.
n: 48,
},
});
if (!searchRequest) {
this.logger.error('No search response', { query });
return;
}
this.logger.debug('Received search response', { query, searchRequest });
const fuzzResults = this.fuzzHtmlResponse(query, searchRequest);
this.logger.debug('Applied fuzzy filter to search results', {
query,
searchRequest,
fuzzResults,
});
const builders = this.initProductBuilders(fuzzResults.slice(0, limit));
this.logger.debug('Created product builders from search results', {
query,
searchRequest,
fuzzResults,
builders,
});
return builders;
}
/**
* Parses HTML response and performs fuzzy filtering on product elements.
* Creates a DOM from the HTML response, selects `div.product--box.box--basic`
* cards from the search listing, and applies fuzzy filtering against the
* card titles returned by {@link titleSelector}.
*
* @param query - The search term to filter products by
* @param response - The HTML response string containing product listings
* @returns Array of DOM Elements that match the fuzzy search criteria
* @example
* ```typescript
* const html = await this.httpGetHtml({ path: "/search", params: { sSearch: "eosin" } });
* if (html) {
* const matches = this.fuzzHtmlResponse("eosin", html);
* console.log(`Found ${matches.length} matching product cards`);
* }
* ```
* @source
*/
protected fuzzHtmlResponse(query: string, response: string): Element[] {
const parsedHTML = createDOM(response);
if (!parsedHTML || parsedHTML === null) {
throw new Error('No data found when loading HTML');
}
const productContainers = parsedHTML.querySelectorAll('div.product--box.box--basic');
if (!productContainers || productContainers.length === 0) {
this.logger.log('No products found', { query, response, parsedHTML, productContainers });
return [];
}
return this.fuzzyFilterAst<Element>(Array.from(productContainers));
}
/**
* Initialize product builders from S3 Chemicals HTML search response cards.
* Transforms each `div.product--box` card into a ProductBuilder instance with
* title, URL, ordernumber (as ID), listing price, description, and quantity.
* Cards that are missing a title or URL are skipped silently via `mapDefined`.
*
* @param elements - Array of DOM Elements containing product cards
* @returns Array of ProductBuilder instances initialized with card data
* @example
* ```typescript
* const fuzz = this.fuzzHtmlResponse("eosin", html);
* const builders = this.initProductBuilders(fuzz);
* // Each builder contains parsed product data from the listing card
* for (const builder of builders) {
* console.log(builder.get("title"), builder.get("price"));
* }
* ```
* @source
*/
protected initProductBuilders(elements: Element[]): ProductBuilder<Product>[] {
this.logger.debug('Building products from elements', { elements });
return mapDefined(elements, (element: Element) => {
const builder = new ProductBuilder<Product>(this.baseURL);
const anchor = element.querySelector('a.product--title');
const href = anchor?.getAttribute('href');
const title = anchor?.getAttribute('title')?.trim() || anchor?.textContent?.trim();
if (!anchor || !href || !title) {
this.logger.error('No title/href for product', { element });
return;
}
// Search results already return absolute URLs; `new URL` with a base is
// defensive and a no-op when `href` is absolute.
const url = new URL(href, this.baseURL);
// Shopware exposes the ordernumber on the wrapper (e.g. "S100210").
// A small number of grouped-variant parents may omit it; we fall back
// to the numeric productID meta in `getProductData` when that happens.
const ordernumber = element.getAttribute('data-ordernumber') ?? undefined;
// Shopware renders prices in German locale (`2.449,00 $`) even when
// the currency is USD — normalize to dot-decimal before `parsePrice`,
// otherwise price-parser mis-reads the comma-decimal form (e.g.
// `"12,25 $"` comes out as $0.12).
const priceText = this.normalizePriceText(
element.querySelector('div.product--price span.price--default')?.textContent ?? '',
);
const price = parsePrice(priceText);
if (price !== undefined) {
builder.setPricing(price.price, price.currencyCode, price.currencySymbol);
}
const description = element
.querySelector('div.product--description')
?.textContent?.trim()
.replace(/\s+/g, ' ');
builder.setDescription(description);
const qtyText = element.querySelector('div.price--unit span.is--nowrap')?.textContent?.trim();
if (qtyText) {
const qty = parseQuantity(qtyText);
if (qty) {
builder.setQuantity(qty);
}
}
builder.setBasicInfo(title, String(url), this.supplierName);
builder.setID(ordernumber);
builder.setCacheKey(this.getUniqueProductKey(element));
builder.setMatchPercentage(this.matchScoreOf(element));
return builder;
});
}
/**
* Reduces a variant's quantity + uom to a single scalar so an array of
* variants can be sorted ascending by chemical content regardless of
* unit. Mass units collapse to milligrams and volume units collapse to
* millilitres — the two families aren't comparable to each other, but
* S3 variants of one product always share a family, so a single ranking
* is enough. Unknown/missing units sort last.
*
* @param v - Variant to rank
* @returns Canonical magnitude (mg or mL) or +Infinity if unknown
* @example
* ```typescript
* this.variantSortRank({ quantity: 25, uom: "g" }); // 25000
* this.variantSortRank({ quantity: 1, uom: "kg" }); // 1000000
* this.variantSortRank({ quantity: 500, uom: "ml" }); // 500
* ```
* @source
*/
protected variantSortRank(v: Partial<Variant>): number {
if (v.quantity === undefined) return Number.POSITIVE_INFINITY;
const uom = v.uom?.toLowerCase() ?? '';
const multipliers: Record<string, number> = {
mg: 1,
g: 1000,
kg: 10e5,
t: 10e8,
ml: 1,
cl: 10,
dl: 100,
l: 1000,
};
const multiplier = multipliers[uom];
if (multiplier === undefined) return Number.POSITIVE_INFINITY;
return v.quantity * multiplier;
}
/**
* Extracts the variant-selector state from a parsed detail block.
* Shopware renders variants as a `<select data-ajax-select-variants="true">`
* where the `name` attribute (e.g. `group[12]`) becomes the GET key that
* switches the displayed variant. Returns `undefined` when the page has
* no variant select (single-variant products).
*
* @param details - The `.product--details` DOM block from the detail page
* @returns The variant group data, or `undefined` if no select is present
* @example
* ```typescript
* const dom = createDOM(await this.httpGetHtml(...));
* const group = this.parseVariantGroup(dom.querySelector("div.product--details")!);
* // group = { selectName: "group[12]", options: [{ value: "438", label: "50g", selected: true }, ...] }
* ```
* @source
*/
protected parseVariantGroup(details: Element | Document): Maybe<{
selectName: string;
options: Array<{ value: string; label: string; selected: boolean }>;
}> {
const select = details.querySelector('select[data-ajax-select-variants="true"]');
const selectName = select?.getAttribute('name');
if (!select || !selectName) {
return undefined;
}
const options = Array.from(select.querySelectorAll('option')).flatMap((opt) => {
const value = opt.getAttribute('value');
if (!value) return [];
return [
{
value,
label: opt.textContent?.trim() ?? '',
selected: opt.hasAttribute('selected'),
},
];
});
if (options.length === 0) return undefined;
return { selectName, options };
}
/**
* Builds a variant-specific URL by appending Shopware's variant group
* GET parameter onto the product's base URL. Used both as the `url`
* value stored on each `Variant` and as an ergonomic breadcrumb.
*
* @param baseUrl - The product's canonical URL (no query string)
* @param selectName - The `name` attribute of the variant select (e.g. `group[12]`)
* @param value - The chosen option's `value` attribute (e.g. `438`)
* @returns The variant URL with the group parameter appended
* @example
* ```typescript
* this.buildVariantUrl(
* "https://shop.es-drei.de/farbstoffe-indikatoren/12285/allurarot-ac",
* "group[12]",
* "438",
* );
* // "https://shop.es-drei.de/farbstoffe-indikatoren/12285/allurarot-ac?group%5B12%5D=438"
* ```
* @source
*/
protected buildVariantUrl(baseUrl: string, selectName: string, value: string): string {
const url = new URL(baseUrl);
url.searchParams.set(selectName, value);
return String(url);
}
/**
* Extracts a single variant's data from a parsed detail block.
* Reads the schema.org meta tags on the page (price, currency, weight,
* productID, SKU) plus the visible price text (for the currency symbol)
* and returns a `Partial<Variant>` suitable for `addVariant`/`setVariants`.
* `parseVariantGroup` already covers option labels; the `label` arg is
* stored as the variant's `title` so users can tell sizes apart.
*
* @param details - The `.product--details` DOM block for this variant
* @param url - Variant-specific URL (from {@link buildVariantUrl})
* @param label - Option label from the select (e.g. `"50g"`)
* @returns Partial variant data extracted from the DOM
* @example
* ```typescript
* const variant = this.extractVariantData(details, variantUrl, "50g");
* // { title: "50g", price: 12.25, currencyCode: "USD", currencySymbol: "$",
* // quantity: 50, uom: "g", id: "89624", sku: "S1002100.1", url: "..." }
* ```
* @source
*/
protected extractVariantData(
details: Element | Document,
url: string,
label?: string,
): Partial<Variant> {
const variant: Partial<Variant> = { url };
if (label) {
variant.title = label;
}
const priceContent = details.querySelector('meta[itemprop="price"]')?.getAttribute('content');
if (priceContent) {
const normalized = Number(this.normalizePriceText(priceContent));
if (!Number.isNaN(normalized)) {
variant.price = normalized;
}
}
const currencyCode = details
.querySelector('meta[itemprop="priceCurrency"]')
?.getAttribute('content');
if (isCurrencyCode(currencyCode)) {
variant.currencyCode = currencyCode;
}
const visiblePrice = details.querySelector('span.price--content')?.textContent;
if (visiblePrice) {
const parsed = parsePrice(this.normalizePriceText(visiblePrice));
if (parsed?.currencySymbol) {
variant.currencySymbol = parsed.currencySymbol;
}
}
// The option label ("25g", "100g", …) is the chemical content size.
// We deliberately ignore `meta[itemprop="weight"]` because Shopware
// reports the *shipping* weight there (bottle + packaging), which made
// every variant collapse to ~1 kg in practice. Fall back to the
// "Inhalt:" line inside `div.price--unit` for single-variant products
// that have no option label.
const qtyFromLabel = label ? parseQuantity(label) : undefined;
if (qtyFromLabel) {
variant.quantity = qtyFromLabel.quantity;
variant.uom = qtyFromLabel.uom;
} else {
const unitText = details
.querySelector('div.price--unit')
?.textContent?.replace(/\s+/g, ' ')
.trim();
if (unitText) {
const cleaned = unitText
.replace(/inhalt\s*:/i, '')
.split('(')[0]
.trim();
const qtyFromUnit = parseQuantity(cleaned);
if (qtyFromUnit) {
variant.quantity = qtyFromUnit.quantity;
variant.uom = qtyFromUnit.uom;
}
}
}
const productID = details.querySelector('meta[itemprop="productID"]')?.getAttribute('content');
if (productID) {
variant.id = productID;
}
const sku = details.querySelector('span[itemprop="sku"]')?.textContent?.trim();
if (sku) {
variant.sku = sku;
}
return variant;
}
/**
* Transforms a partial product item into a complete Product object.
* Fetches the product detail page with `template=ajax`, then iterates
* every option in the Shopware variant select (appending the
* `group[N]=value` GET parameter for each) to collect every size the
* product is sold in. Common fields (description, CAS, availability)
* come from the initial fetch; the top-level builder price/quantity/ID
* reflects the smallest variant (lowest quantity, ties broken by price).
*
* @param product - ProductBuilder to enrich with detail-page data
* @returns Promise resolving to the enriched ProductBuilder or void if the fetch fails
* @example
* ```typescript
* const builder = new ProductBuilder<Product>("https://shop.es-drei.de");
* builder.setBasicInfo("Allurarot AC", "https://shop.es-drei.de/farbstoffe-indikatoren/12285/allurarot-ac", "S3 Chemicals");
* const enriched = await supplier.getProductData(builder);
* // enriched.get("price") === 2.99 // smallest (5g) variant
* // enriched.get("variants")?.length === 5
* ```
* @source
*/
protected async getProductData(
product: ProductBuilder<Product>,
): Promise<ProductBuilder<Product> | void> {
return this.getProductDataWithCache(product, async (builder) => {
this.logger.debug('Querying data for partialproduct', { builder });
if (typeof builder === 'undefined') {
this.logger.error('No products to get data for', { builder });
return;
}
const baseUrl = builder.get('url');
// `template=ajax` returns the same `.product--details` block without
// the surrounding layout — roughly a 95% payload reduction per request.
// The detail page only *enriches* a product (CAS, formula, SDS, variants); the search
// listing already provided title/price/quantity, so a failed/blocked detail fetch keeps the
// product with its listing data instead of dropping the whole thing.
let initialResponse: Maybe<string>;
try {
initialResponse = await this.httpGetHtml({
path: baseUrl,
params: { template: 'ajax' },
});
} catch (error) {
if (isExpectedAbort(error)) {
this.logger.debug(`S3 detail fetch aborted; keeping search-listing data`, { error });
return builder;
}
this.logger.warn(
`S3 detail fetch failed; keeping search-listing data: ${getErrorMessage(error)}`,
{ error, builder },
);
return builder;
}
if (!initialResponse) {
this.logger.warn('No product response', { builder });
return builder;
}
const initialDom = createDOM(initialResponse);
const initialDetails = initialDom.querySelector('div.product--details') ?? initialDom;
// --- Common (product-wide) data from the initial fetch -------------
const availabilityHref = initialDetails
.querySelector('link[itemprop="availability"]')
?.getAttribute('href');
if (availabilityHref) {
const token = availabilityHref.split('/').pop();
if (token) {
builder.setAvailability(token);
}
}
// The description body is a labelled German spec list ("Summenformel" / "Molare Masse" /
// "CAS-Nummer"), not prose — pull the structured fields out of it rather than storing it
// as the description.
const descriptionBody = initialDetails.querySelector(
'div.product--description[itemprop="description"] > div',
);
for (const line of Array.from(descriptionBody?.querySelectorAll('p') ?? [])) {
const text = line.textContent?.trim() ?? '';
if (/Summenformel/i.test(text)) {
// The formula carries <sub> markup; setFormula -> findFormulaInHtml converts it.
builder.setFormula(line.innerHTML.split(/Summenformel\s*:/i)[1] ?? '');
} else if (/Molare?\s*Masse|Molmasse/i.test(text)) {
// German number formatting: "496,42g/mol" -> 496.42 (thousands ".", decimal ",").
const mass = text.replace(/.*Masse\s*:?\s*/i, '').match(/[\d.,]+/)?.[0];
if (mass) {
builder.setMoleweight(mass.replace(/\./g, '').replace(',', '.'));
}
} else if (/CAS/i.test(text)) {
builder.setCAS(text);
}
}
// Fall back to the product title for CAS when the spec list didn't carry one.
const titleText =
initialDetails.querySelector('h1.product--title[itemprop="name"]')?.textContent?.trim() ??
'';
if (!builder.get('cas')) {
builder.setCAS(titleText);
}
builder
.setSpecSheetUrl(
initialDetails.querySelector('a[href*="documents/spezifikation"]')?.getAttribute('href'),
)
.setSDSUrl(initialDetails.querySelector('a[href*="documents/sdb"]')?.getAttribute('href'))
.setImage(
initialDetails.querySelector('.image--element')?.getAttribute('data-img-original'),
)
.setThumbnail(
initialDetails.querySelector('.image--element')?.getAttribute('data-img-small'),
);
// --- Variant enumeration -------------------------------------------
const group = this.parseVariantGroup(initialDetails);
const selectedOption = group?.options.find((o) => o.selected) ?? group?.options[0];
const initialVariantUrl =
group && selectedOption
? this.buildVariantUrl(baseUrl, group.selectName, selectedOption.value)
: baseUrl;
const variants: Partial<Variant>[] = [
this.extractVariantData(initialDetails, initialVariantUrl, selectedOption?.label),
];
if (group && group.options.length > 1) {
const others = group.options.filter((o) => o.value !== selectedOption?.value);
const fetched = await Promise.all(
others.map(async (opt) => {
const html = await this.httpGetHtml({
path: baseUrl,
params: { template: 'ajax', [group.selectName]: opt.value },
});
if (!html) return undefined;
const dom = createDOM(html);
const details = dom.querySelector('div.product--details') ?? dom;
return this.extractVariantData(
details,
this.buildVariantUrl(baseUrl, group.selectName, opt.value),
opt.label,
);
}),
);
for (const v of fetched) {
if (v) variants.push(v);
}
}
// --- Sort variants ascending by chemical quantity ------------------
// `parseQuantity` returns normalized units (1000g → 1kg, 500mg → 0.5g),
// so a raw numeric sort would put "1 kg" before "25 g". Convert each
// variant's quantity to a canonical magnitude (milligrams for mass,
// millilitres for volume) before comparing. Missing values sort last.
variants.sort((a, b) => {
const ra = this.variantSortRank(a);
const rb = this.variantSortRank(b);
if (ra !== rb) return ra - rb;
const pa = a.price ?? Number.POSITIVE_INFINITY;
const pb = b.price ?? Number.POSITIVE_INFINITY;
return pa - pb;
});
// --- Promote the smallest variant to parent-level fields -----------
const primary = variants[0];
if (primary) {
builder.setPrice(primary.price);
builder.setCurrencyCode(primary.currencyCode);
builder.setCurrencySymbol(primary.currencySymbol);
if (primary.quantity !== undefined && primary.uom) {
builder.setQuantity(primary.quantity, primary.uom);
}
if (primary.sku !== undefined) builder.setSku(String(primary.sku));
// Only overwrite the parent ID if the listing card didn't give us
// the short ordernumber (which is the cleaner identifier).
if (!builder.get('id')) {
builder.setID(primary.id);
}
}
if (variants.length > 1) {
builder.setVariants(variants);
}
this.logger.debug('Built product details', { builder });
return builder;
});
}
/**
* Extracts the product title from a search card DOM Element.
* Prefers the `title` attribute on `a.product--title` (guaranteed clean)
* and falls back to the anchor's `textContent` when missing.
*
* @param data - The DOM Element containing the product card
* @returns The product title, or undefined if the anchor/title is missing
* @example
* ```typescript
* const card = document.querySelector("div.product--box.box--basic");
* if (card) {
* const title = this.titleSelector(card);
* console.log("Product title:", title);
* // Output: "Allurarot AC"
* }
* ```
* @source
*/
protected titleSelector(data: Element): Maybe<string> {
if (!data) {
this.logger.error('No data for product', { data });
return undefined;
}
const anchor = data.querySelector('a.product--title');
const title = anchor?.getAttribute('title')?.trim() || anchor?.textContent?.trim();
if (!title) {
this.logger.error('No title for product', { data });
return undefined;
}
return title;
}
}
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