// Utilities for scraping data from the Lodestone

/**
 * @see https://stackoverflow.com/a/6969486
 * @param {string}
 * @returns {string}
 */
const regExpEscape = str => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

/**
 * Creates a regular expression that matches a link to the named item and
 * captures its EDB ID from the matched link's `href` attribute.
 * @param {string} name
 * @returns {RegExp}
 */
const itemLinkRegExp = name => new RegExp(`<a href="/lodestone/playguide/db/item/(?<id>[a-z0-9]+)[^"]+"[^>]*>(?<name>${regExpEscape(name)})</a>`, 'i');

/**
 * Gets the ID of the named item in Eorzea Database.
 * @param {string} name
 * @returns {Promise<string | undefined>}
 */
export async function findItemEDBID (name) {
	// execute a search for the item's name
	const searchURL = `https://na.finalfantasyxiv.com/lodestone/playguide/db/item/?q=${encodeURIComponent(name.replace(/\([^)]+\)|&/g, ' '))}`;
	const response = await fetch(searchURL);
	const body = await response.text();
	// find an `<a>` in the HTML response whose text exactly matches the name
	const match = body.match(itemLinkRegExp(name));
	// return the ID parsed from the URL in the `href` attribute
	return match?.groups.id;
}