let base_url = "https://rb.marks.kitchen"
let formats = ["Atom", "Mrss", "Html"]
let types = {
    'application/rss+xml': "rss",
    'application/atom+xml': "atom",
    'application/rdf+xml': "rdf",
    'application/rss': "rss",
    'application/atom': "atom",
    'application/rdf': "rdf",
    'text/rss+xml': "rss",
    'text/atom+xml': "atom",
    'text/rdf+xml': "rdf",
    'text/rss': "rss",
    'text/atom': "atom",
    'text/rdf': "rdf"
}

function normalize_feed_url(feed_url) {
    if (feed_url.startsWith('/')) {
        let url = window.location.href
        feed_url = url.split('/')[0] + '//' + url.split('/')[2] + feed_url;
    }
    return feed_url
}

function find_links_in_page() {
    let links = document.querySelectorAll('link[type]');
    let feeds = [];
    for (let i = 0; i < links.length; i++) {
        if (links[i].hasAttribute('type') && links[i].getAttribute('type') in types) {
            let title = links[i].getAttribute('title')
            let feed_url = normalize_feed_url(links[i].getAttribute('href'));
            let type = types[links[i].getAttribute('type')]
            let feed = {
                type: `native: ${title || type}`,
                url: feed_url,
            };
            feeds.push(feed);
        }
    }
    return feeds
}

function get_all_types(feed_url) {
    let feeds = [];
    formats.forEach(el => {
        feeds.push({
            type: `rss-bridge: ${el}`,
            url: feed_url + el
        });
    })
    return feeds;
}

async function get_insta(url) {
    let insta_url = url + "?__a=1"
    console.log("fetching")
    let res = await fetch(insta_url);
    let json = await res.json(); 
    let uid = json.graphql.user.id
    let feed_url = `${base_url}/?action=display&bridge=Instagram&context=Username&u=${uid}&media_type=all&format=`;
    return get_all_types(feed_url)
}

function get_twitter(url) {
    let pattern = /twitter.com\/(\w+).*/
    let match = url.match(pattern);
    let twitter_handle = match[1]
    let feed_url = `${base_url}/?action=display&bridge=Twitter&context=By+username&u=${twitter_handle}&format=`
    return get_all_types(feed_url)
}


async function get_feed_urls() {
    let all_feed_urls = []
    let url = window.location.href;
    //url = url.toLowerCase()
    if (url.includes("instagram")) {
        all_feed_urls = all_feed_urls.concat(await get_insta(url))
    } else if (url.includes("twitter")) {
        all_feed_urls = all_feed_urls.concat(get_twitter(url))
    }
    all_feed_urls = all_feed_urls.concat(find_links_in_page())
    return all_feed_urls
}

browser.runtime.onMessage.addListener(function (msg, sender) {
    return Promise.resolve(get_feed_urls());
})