import {Config} from './config';
import {Store, Stores} from './store';
import puppeteer from 'puppeteer';
import open from 'open';
import sendNotification from './notification';
import {Logger} from './logger';

/**
 * Starts the bot.
 */
async function main() {
	const results = [];
	for (const store of Stores) {
		Logger.debug(store.links);
		results.push(lookup(store));
	}

	await Promise.all(results);

	Logger.info('↗ trying stores again');
	setTimeout(main, Config.rateLimitTimeout);
}

/**
 * Responsible for looking up information about a each product within
 * a `Store`. It's important that we ignore `no-await-in-loop` here
 * because we don't want to get rate limited within the same store.
 *
 * @param store Vendor of graphics cards.
 */
async function lookup(store: Store) {
/* eslint-disable no-await-in-loop */
	for (const link of store.links) {
		const browser = await puppeteer.launch();
		const page = await browser.newPage();
		await page.setUserAgent(Config.page.userAgent);
		await page.setViewport({
			height: Config.page.height,
			width: Config.page.width
		});

		const graphicsCard = `${link.brand} ${link.model}`;

		try {
			await page.goto(link.url, {waitUntil: 'networkidle0'});
		} catch {
			Logger.error(`✖ [${store.name}] ${graphicsCard} skipping; timed out`);
			return;
		}

		const bodyHandle = await page.$('body');
		const textContent = await page.evaluate(body => body.textContent, bodyHandle);

		Logger.debug(textContent);

		if (isOutOfStock(textContent, link.oosLabels)) {
			Logger.info(`✖ [${store.name}] ${graphicsCard} is still out of stock`);
		} else {
			Logger.info(`🚀🚀🚀 [${store.name}] ${graphicsCard} IN STOCK 🚀🚀🚀`);
			Logger.info(link.url);

			Logger.debug('ℹ saving screenshot');
			await page.screenshot({path: `success-${Date.now()}.png`});

			const givenUrl = store.cartUrl ? store.cartUrl : link.url;
			await open(givenUrl);
			sendNotification(givenUrl);
		}

		await browser.close();
	}
/* eslint-enable no-await-in-loop */
}

/**
 * Checks if DOM has any out-of-stock related text.
 *
 * @param domText Complete DOM of website.
 * @param oosLabels Out-of-stock labels.
 */
function isOutOfStock(domText: string, oosLabels: string[]) {
	const domTextLowerCase = domText.toLowerCase();
	return oosLabels.some(label => domTextLowerCase.includes(label));
}

/**
 * Will continually run until user interferes.
 */
try {
	void main();
} catch (error) {
	// Ignoring errors; more than likely due to rate limits
	Logger.error(error);
	void main();
}