// ==UserScript==
// @name         Chin Fast Image Downloader
// @namespace    http://tampermonkey.net/
// @version      1
// @description  One click to download current hovered in threads
// @author       Benjababe
// @match        https://boards.4channel.org/*/thread/*
// @icon         https://www.google.com/s2/favicons?domain=4channel.org
// @grant        GM_download
// @downloadURL none
// ==/UserScript==

// jshint esversion: 6

(function() {
    'use strict';

    document.onkeydown = (e) => {
        // key can be whatever you want, I choose pause as it's what I bound my mouse side keys to
        if (e.code === "Pause") {
            // get all elements hovered
            let els = document.querySelectorAll( ":hover" );
            els.forEach((el) => {
                // only download for images
                if (el.tagName.toLowerCase() === "img") {
                    let url = el.src,
                        filename = HDFilenameFromURL(el.src);
                    GM_download(url, filename);
                }
            });
        }
    }

    // eg. "1622014662736s.jpg -> 1622014662736.jpg"
    let HDFilenameFromURL = (url) => {
        let SDFilename = url.split("/").pop();
        SDFilename = SDFilename.split(".");
        SDFilename[0] = SDFilename[0].slice(0, -1);
        return SDFilename.join(".");
    }
})();