const puppeteer = require('puppeteer');

function getDateString(date, separator = '/') {
    var d = ('0' + date.getDate()).slice(-2)
    var m = ('0' + (date.getMonth() + 1)).slice(-2)
    var y = date.getFullYear()
    return m + separator + d + separator + y
}

async function search(orr, dest, date)
{
    const browser = await puppeteer.launch()
    function timeout(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }
    const page = await browser.newPage()
    await page.setUserAgent('Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36')

    await page.goto('http://united.com/ual/en/us/flight-search/book-a-flight/', {waitUntil: 'networkidle0'})

    let results = null
    let ready = false

    let lang = await page.$("a.language-region-change.btn.btn-primary");

    if (lang != null) {
        await page.click("a.language-region-change.btn.btn-primary", {delay: 100})
    }

    await page.evaluate(() => {
        const ow = document.querySelector("#TripTypes_ow")
        ow.click()
        document.querySelector("#Trips_0__NonStop").click()
        document.querySelector("#Trips_0__OneStop").click()
        document.querySelector("#Trips_0__TwoPlusStop").click()
    })
    await page.click('#TripTypes_ow')
    await timeout(100)
    await page.evaluate(() => {
        const rm = document.querySelector("#RedeemMiles_rMiles")
        rm.click()
    })
    await timeout(100)
    await page.evaluate(function() {
        document.querySelector('#Trips_0__Origin').value = ''
        document.querySelector('#Trips_0__Destination').value = ''
        document.querySelector('#Trips_0__DepartDate').value = ''
    })
    await timeout(100)
    await page.type('#Trips_0__Origin', orr, {delay: 100})
    await timeout(100)
    await page.type('#Trips_0__Destination', dest, {delay: 100})
    await timeout(100)
    await page.type('#Trips_0__DepartDate', date,  {delay: 100})
    await timeout(1000)
    await page.evaluate(() => {
        const btn = document.querySelector("#btn-search")
        btn.click()
    })

    page.on('response', async msg => {
        if (msg.request().resourceType == 'xhr') {
            console.log(msg.request().url)
        }
    })

    await timeout(10000)

    page.screenshot({path: 'example.png', fullPage: true})
}

search("PDX", "EWR", "5/15/18");