const jsdom = require("jsdom");
const { JSDOM } = jsdom;
const fs = require('fs');
const { updateURLLink } = require('./common');

const target = "UBUNTU_SERVER_RPI_IMAGE_URL";
const url = "http://cdimage.ubuntu.com/ubuntu/releases/";
const reg = ".*(?<release>[0-9][02468])\.04\.?(?<minor>[0-9]{1})?.*";

// Read the input file, and parse the variable input
try {
    const data = fs.readFileSync('../test/run-tests.sh', 'utf8')
          .split('\n')
          .filter(line => line.match(`${target}=.*`));
    var line = data[0];
    var m = line.match(`.*=\"${reg}\"`);
    var imageName = m.groups.release;
    var minor = m.groups.minor || 0;
} catch (err) {
    console.error(err);
    process.exit(1);
}

JSDOM.fromURL(url, {}).then(dom => {
    var document = dom.window.document;
    var refs = document.getElementsByTagName("a");
    var matches = Array.from(refs)
        .filter(ref => ref.textContent.match(reg))
        .filter(ref => !ref.textContent.match(reg).groups.minor) // Ignore the minor number
        .reduce((acc, ref) => {
            acc.push(ref.textContent.match(reg));
            return acc;
        }, [])
        .sort((a,b) => {
            return parseInt(b.groups.release) - parseInt(a.groups.release);
        });
    var matchOn = matches[0].input;

    return matchOn;

    // Get the release image url from the releases (sub)-page
    // const url = "http://cdimage.ubuntu.com/ubuntu/releases/"
}).then(releaseVersion => {
    var releasedVersion = releaseVersion.replace(/\s/g, "").replace(/\//g, "");
    JSDOM.fromURL(`${url}${releasedVersion}/release/`, {}).then(dom => {
        var document = dom.window.document;
        var refs = document.getElementsByTagName("a");
        const match = Array.from(refs).find(ref => ref.href.match(`.*ubuntu-${releasedVersion}\.?[0-9]+-preinstalled-server-armhf.*\.img\.xz$`));
        if (match) {
            console.log(`Ubuntu server image has a new release: ${match}`);
            updateURLLink(`${target}=\"${match}\"`, target);
        }
    })
        .catch(err => {
            console.log('Failed to get the update URL');
            console.log(`${url}${releasedVersion}/release/`);
            JSDOM.fromURL(`${url}${releasedVersion}/beta/`, {})
                .then(dom => {
                    console.log('Only the beta is out still');
                });
        });
})
    .catch(err => {
        console.log('Failed to get the URL');
        console.log(url);
        console.log(err);
        throw err;
    });