Adds owner counts to the value page

NSValuePageOwnerCount

// ==UserScript==
// @name         NSValuePageOwnerCount Gist version
// @namespace    sitethiefs-ns-scripts
// @version      0.2.1
// @description  Adds owner counts to the value/bids/asks/auctions page
// @author       Sitethief of Vylixan
// @copyright    GPLv3 https://www.gnu.org/licenses/gpl-3.0.html
// @match        https://www.nationstates.net/page=deck/value_deck*
// @match        https://www.nationstates.net/*/value_deck*
// @match        https://www.nationstates.net/page=deck/show_trades=bids
// @match        https://www.nationstates.net/*/show_trades=bids*
// @match        https://www.nationstates.net/page=deck/show_trades=asks
// @match        https://www.nationstates.net/*/show_trades=asks*
// @match        https://www.nationstates.net/page=deck/show_trades=auctions
// @match        https://www.nationstates.net/*/show_trades=auctions*
// @match        https://www.nationstates.net/page=deck/show_market=auctions
// @match        https://www.nationstates.net/*/show_market=auctions*
// @icon         https://www.google.com/s2/favicons?domain=nationstates.net
// @grant        GM.xmlHttpRequest
// ==/UserScript==
(function () {
    'use strict';
    /**
     *
     * Start of customizable options
     *
     **/
    let options = {
        mainNationName: '', // This should be your main nation name to identify you in all API requests
    }
    /**
     *
     * End of customizable options
     *
     **/

    if (options.mainNationName) {

        const sleepNow = (delay) => new Promise((resolve) => setTimeout(resolve, delay))

        async function getOwners(cardID, cardSeason, row) {
            GM.xmlHttpRequest({
                headers: {
                    "User-Agent": options.mainNationName,
                    "Accept": "text/xml",
                },
                method: "GET",
                url: `https://www.nationstates.net/cgi-bin/api.cgi?q=card+info+owners;cardid=${cardID};season=${cardSeason}`,
                onload: async function (response) {
                    let responseXML = new DOMParser()
                        .parseFromString(response.responseText, "text/xml");
                    let owners = responseXML.getElementsByTagName("OWNER");
                    console.log(owners);
                    let cardsCount = owners.length;
                    let ownersCount = await countOwners(owners, row);
                    const cardsCountTD = document.createElement("td");
                    const cardsTextnode = document.createTextNode(cardsCount);
                    cardsCountTD.appendChild(cardsTextnode);
                    row.appendChild(cardsCountTD);
                }
            });
        }

        function countOwners(owners, row) {
            let ownersCount = 0;
            let ownersList = [];
            for (let i = 0; i < owners.length; i++) {
                if (typeof ownersList[owners[i].innerHTML] === 'undefined') {
                    ownersList[owners[i].innerHTML] = true;
                    ownersCount++;
                }
            }
            const ownerCountTD = document.createElement("td");
            const ownerTextnode = document.createTextNode(ownersCount);
            ownerCountTD.appendChild(ownerTextnode);
            row.appendChild(ownerCountTD);
        }

        async function startLoop() {
            let rows = document.querySelectorAll('.auctionslisttable tbody tr');
            for (let i = 0; i < rows.length; i++) {
                let row = rows[i]
                let auctionCell = row.querySelector('td:nth-child(1) p');
                if (!auctionCell || auctionCell.innerText !== 'Auction') {

                    let cardID = null;
                    let season = null;
                    let linkTD = row.querySelector('td:nth-child(2)');
                    let cardLink = linkTD.querySelector('a.cardnameblock');
                    const url = new URL(cardLink.href);
                    let splitpaths = url.pathname.split('/');
                    let foundID = splitpaths.filter(s => s.includes('card='));
                    if (foundID[0]) {
                        cardID = foundID[0].replace('card=', '');
                    }
                    let foundSeason = splitpaths.filter(s => s.includes('season='));
                    if (foundSeason[0]) {
                        season = foundSeason[0].replace('season=', '');
                    }

                    if (season && cardID) {
                        getOwners(cardID, season, row);
                        await sleepNow(700);
                    }
                } else {
                    const ownerHeader = document.createElement("td");
                    const ownereTextnode = document.createTextNode("Owners");
                    ownerHeader.appendChild(ownereTextnode);
                    row.appendChild(ownerHeader);
                    const cardsHeader = document.createElement("td");
                    const cardsTextnode = document.createTextNode("Cards");
                    cardsHeader.appendChild(cardsTextnode);
                    row.appendChild(cardsHeader);
                }
            }
        }

        startLoop();
    }
})();