const puppeteer = require('puppeteer');
const util = require('util');
const exec = util.promisify(require('child_process').exec);

const changeProxy = () => {

    (async () => {

        const { stdout, stderr } = await exec("nc64 localhost 9151 <tor-change.txt");
        console.log('stdout:', stdout);
    })();

    return;

}


const preparePageForTests = async (page) => {
    // Pass the User-Agent Test.
    const userAgent = 'Mozilla/5.0 (X11; Linux x86_64)' +
        'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.39 Safari/537.36';
    await page.setUserAgent(userAgent);

    // Pass the Webdriver Test.
    await page.evaluateOnNewDocument(() => {
        Object.defineProperty(navigator, 'webdriver', {
            get: () => false,
        });
    });

    // Pass the Chrome Test.
    await page.evaluateOnNewDocument(() => {
        // We can mock this in as much depth as we need for the test.
        window.navigator.chrome = {
            runtime: {},
            // etc.
        };
    });

    // Pass the Permissions Test.
    await page.evaluateOnNewDocument(() => {
        const originalQuery = window.navigator.permissions.query;
        return window.navigator.permissions.query = (parameters) => (
            parameters.name === 'notifications' ?
                Promise.resolve({ state: Notification.permission }) :
                originalQuery(parameters)
        );
    });

    // Pass the Plugins Length Test.
    await page.evaluateOnNewDocument(() => {
        // Overwrite the `plugins` property to use a custom getter.
        Object.defineProperty(navigator, 'plugins', {
            // This just needs to have `length > 0` for the current test,
            // but we could mock the plugins too if necessary.
            get: () => [1, 2, 3, 4, 5],
        });
    });

    // Pass the Languages Test.
    await page.evaluateOnNewDocument(() => {
        // Overwrite the `plugins` property to use a custom getter.
        Object.defineProperty(navigator, 'languages', {
            get: () => ['en-US', 'en'],
        });
    });
}


const blockImages = async (page) => {

    await page.setRequestInterception(true);
    page.on('request', request => {
        if (request.resourceType() === 'image')
            request.abort();
        else
            request.continue();
    });
    return;
}


const scrape = async (pageURL, resolve) => {

    const resolutions = [[1366, 768], [1920, 1080], [1536, 864]]

    const priceRegEx = /(\$)(\d{1,4}\.\d{1,2})$/;
    const priceStringSelector = ".form-type-radio";

    const browser = await puppeteer.launch({ headless: false, args: ['--proxy-server=socks5://localhost:9150'] });
    const page = await browser.newPage();

    await preparePageForTests(page);

    // resolutions

    let rndRes = Math.floor(Math.random() * resolutions.length);
    rndRes = resolutions[rndRes];
    await page.setViewport({ width: rndRes[0], height: rndRes[1] });

    await page.goto(pageURL, { waitUntil: 'domcontentloaded', referer: "" });


    try {
        await page.waitForSelector(priceStringSelector, {
            timeout: 3000
        })

    } catch (err) {
        throw err
    }

    const priceString = await page.evaluate((priceStringSelector) => {

        const price = document.querySelector(priceStringSelector);

        const priceText = price.innerText;



        return priceText;
    }, priceStringSelector);

    const matchedPrice = priceString.match(priceRegEx);
    if(!matchedPrice){
        console.log(`price matching went wrong, alarm! The string was ${priceString}`);
        return;
    }

    await browser.close();
    resolve();
}

let pageURLs = ["https://nostarch.com/algorithmic-thinking", "https://nostarch.com/writegreatcode1_2e"];



function scrapeThemAll(){

        const scrapeInProgress = new Promise((resolve, reject)=>{
            scrape(pageURLs[0], resolve);
        })
        scrapeInProgress.then(()=>{

            changeProxy();
            pageURLs.shift();
            if(pageURLs.length){
                scrapeThemAll();
            }
        })

}


scrapeThemAll();