// ==UserScript==
// @name 4chan GETter
// @description Script to help you get repeating digits. Loosely based on mGET. Requires 4chan X.
// @author Xyl
// @match *://*.4chan.org/*
// @match *://*.4channel.org/*
// @grant GM_xmlhttpRequest
// @connect sys.4chan.org
// @version 1.2.1
// @namespace https://xyllon.com
// ==/UserScript==

let latestPostNumber = -1;
const board = location.pathname.match(/\/[^\/]+\//)[0];
let games = (board == "/v/" || board == "/vg/" || board == "/vr/");

if (document.getElementById("qr")) inject();
document.addEventListener('QRDialogCreation', (e) => inject());

function inject() {
    let dubs = (games) ? "" : "<option value=\"dubs\">Dubs</option>";
    document.querySelector('#qr .move').insertAdjacentHTML("afterend", `
    <div class="getscript"  5px; padding-left: 5px;">Last Post #<span id="postnumber"  hidden"></span>
    <div  right; margin-right: 15px;">
    &lt;input type="number" name="offset" value="1"  -3px; width: 5ch; height: 16px; padding: 0px !important; -moz-appearance:textfield;" id="offset" title="When to post (a value of 1 with a target post of 99 will post at 98, a value of 2 will post at 97, etc.)"&gt;
    <select data-name="digits" id="digits" title="Select the numbers you want">
    <option value="none">Select GET</option>` + dubs + `
    <option value="trips">Trips</option>
    <option value="quads">Quads</option>
    <option value="quints">Quints</option>
    <option value="sexts">Sexts</option>
    <option value="septs">Septs</option>
    <option value="octs">Octs</option>
    <option value="nons">Nons</option>
    <option value="decs">Decs</option>
    </select></div></div>`);
    approxLatestPostNumber();
}

function checkForGET () {
    window.target = latestPostNumber + parseInt(document.getElementById('offset').value);
    switch(document.getElementById("digits").value) {
        case "":
            break;
        case "dubs":
            return /(\d)\1{1,}$/.test(target);
            break;
        case "trips":
            return /(\d)\1{2,}$/.test(target);
            break;
        case "quads":
            return /(\d)\1{3,}$/.test(target);
            break;
        case "quints":
            return /(\d)\1{4,}$/.test(target);
            break;
        case "sexts":
            return /(\d)\1{5,}$/.test(target);
            break;
        case "septs":
            return /(\d)\1{6,}$/.test(target);
            break;
        case "octs":
            return /(\d)\1{7,}$/.test(target);
            break;
        case "nons":
            return /(\d)\1{8,}$/.test(target);
            break;
        case "decs":
            return /(\d)\1{9,}$/.test(target);
            break;
    }
}

function approxLatestPostNumber() {
    fetch("https://a.4cdn.org" + board + "1.json").then(response => response.json()).then(json => {
        let threadFound = false;
        let thread = 0;
        while (!threadFound) {
            if (json.threads[thread].posts[0].closed == 1 || json.threads[thread].posts[0].sticky == 1) thread++;
            else threadFound = true;
        }
        latestPostNumber = json.threads[thread].posts.slice(-1)[0].no;
        document.getElementById("postnumber").textContent = latestPostNumber;
updatePostNumber();
    });
}

function updatePostNumber() {
    GM_xmlhttpRequest({
        url: ("https://sys.4chan.org" + board + "imgboard.php?res=" + (latestPostNumber + 1)),
        method: "HEAD",
        onload: response => {
if (response.status == 200) {
latestPostNumber++;
} else if (games && /(([1-9])\2|[^0]0{2,2})$/.test(latestPostNumber + 1)) {
if (/[^9]99$/.test(latestPostNumber + 1)) latestPostNumber += 2;
else latestPostNumber++;
}
if (checkForGET()) {
document.querySelector("#file-n-submit input:last-child").click();
document.getElementById("digits").value = "none";
}
document.getElementById("postnumber").style.visibility = "visible";
document.getElementById("postnumber").textContent = latestPostNumber;
updatePostNumber();
        }
    });
}