// ==UserScript==
// @name         Remove Sponsored Facebook Elements
// @description  Remove sponsored items from feed.
// @author       Turing Eret
// @namespace    us.lambdacalcul
// @version      0.1
// @copyright    Copyright © 2020 Turing Eret
// @license      MIT
// @match        https://*.facebook.com/*
// @grant        none
// @require      https://code.jquery.com/jquery-3.2.1.min.js
// ==/UserScript==

(function() {
    'use strict';
    var $ = window.jQuery;

    // configuration of the observers:
    var feedConfig = { childList: true, subtree: true };
    var sponsoredConfig = { childList: true };

    console.log("Remove Sponsored Facebook Elements started!");

    var sponsoredObserver = new MutationObserver(function(mutations)
    {
        mutations.forEach(function(mutation)
        {
            if(mutation.type === 'childList' && mutation.addedNodes.length > 0)
            {
                var offending_nodes = $('div[data-pagelet^="FeedUnit"]:has(a[aria-label="Sponsored"])');
                for(var i = 0; i < offending_nodes.length; ++i)
                {
                    console.log("Removing Sponsored Feed Items!");
                    offending_nodes[i].remove();
                }
            }
        });
    });

    var feedObserver = new MutationObserver(function(mutations)
    {
        mutations.forEach(function(mutation)
        {
            if(mutation.type === 'childList' && mutation.addedNodes.length > 0)
            {
                var feed_nodes = $('div[role="feed"]');
                if(feed_nodes.length > 0)
                {
                    console.log("Installing Sponsored Observer!");
                    sponsoredObserver.observe(feed_nodes[0], sponsoredConfig);
                    feedObserver.disconnect();
                }
            }
        });
    });

    var feed_nodes = $('div[role="feed"]');
    if(feed_nodes.length > 0)
    {
        console.log("Installing Sponsored Observer!");
        sponsoredObserver.observe(feed_nodes[0], sponsoredConfig);
    }
    else
    {
        console.log("Installing Feed Observer!");
        feedObserver.observe(document.querySelector('body'), feedConfig);
    }

})();