// ==UserScript==
// @name         Remove Subscriber Only Problems From Leetcode
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  try to take over the world!
// @author       You
// @match        https://leetcode.com/problemset/all/
// @grant        none
// ==/UserScript==
(function() {
    'use strict';

    let tableObserver;
    const tableSelector = ".table-striped";
    const addMutationObserverToDocument = () => {
        if(tableObserver){
            tableObserver.disconnect()
        }
        let targetNode = document.querySelector(tableSelector);
        let observerOptions = {
            childList: true,
            subtree: true
        }
        let callback = (mutationList, observer) => {
            mutationList.forEach((mutation) => {
                if (mutation.type == 'childList') {
                    targetNode.querySelectorAll('tr').forEach((row, index) => {
                        if (row.cells.length>=3 && row.cells[2].querySelectorAll("i[class~='fa-lock']").length) {
                            try{
                                row.parentElement.removeChild(row);
                            }
                            catch(e){'I am bad';}

                        }
                    })
                }
            })
        }
        tableObserver = new MutationObserver(callback);
        tableObserver.observe(targetNode, observerOptions);
    }

    let docObserver = new MutationObserver((mutationList, observer) => {
        mutationList.forEach((mutation) => {
            if (mutation.type == 'childList') {
                if (document.querySelectorAll(tableSelector).length) {
                    addMutationObserverToDocument();
                }
            }
        })
    });

    docObserver.observe(document, {
        childList: true,
        subtree: true
    });

})();