// ==UserScript==
// @name         Reddit Fix
// @namespace    http://tampermonkey.net/
// @version      1.3.2
// @description  Fix of the infinite scroll and removes background effects on comments
// @author       Bum
// @require      http://code.jquery.com/jquery-3.4.1.min.js
// @match        https://www.reddit.com/*
// @grant        GM_addStyle
// @downloadURL none
// ==/UserScript==

var holdTopicsInMemory = "false";
var commentEffects = "false";
var originalBehavior = "false";

if (localStorage.getItem("holdTopicsInMemory") != null) {
    holdTopicsInMemory = localStorage.getItem("holdTopicsInMemory");
}

if (localStorage.getItem("commentEffects") != null) {
    commentEffects = localStorage.getItem("commentEffects");
}

if (localStorage.getItem("originalBehavior") != null) {
    originalBehavior = localStorage.getItem("originalBehavior");
}

var lastScrollTop = 0;
var topicsInMemory = [];
var isAPop = false;
var maxOffset = 0;

(function() {
    'use strict';
    function GM_addStyle(css) {
        const style = document.getElementById("GM_addStyle") || (function() {
            const style = document.createElement('style');
            style.type = 'text/css';
            style.id = "GM_addStyle";
            document.head.appendChild(style);
            return style;
        })();
        const sheet = style.sheet;
        sheet.insertRule(css, (sheet.rules || sheet.cssRules || []).length);
    }

    if (commentEffects == "false")
    {
        GM_addStyle ( 'img[src*="flame"]{display:none;}' );
        GM_addStyle ( 'div[aria-role="presentation"]{box-shadow:none !important;background : transparent !important;}' );
    } 

    window.addEventListener('scroll', throttle(callback, 300));

    function throttle(fn, wait) {
        var time = Date.now();
        return function() {
            if ((time + wait - Date.now()) < 0) {
                fn();
                time = Date.now();
            }
        }
    }

    function getMenuItem(id, display)
    {
        return '<a class="M2Hk_S2yvXpsNPfZMBMur customRedditFixMenu" id = "'+id+'" ><div class="_1lwNBHmCQJObvqs1fXKSYR" style="margin-right: 0px;">'+display+'</div></a>';
    }

    function getCheckBoxItem(checked, id, display){

        if (checked == 'true')
            return '<a data-redditstyle="true" class="_1YWXCINvcuU7nk0ED-bta8" class = "fixRedditCustomMenuB"><div class="vzhy90YD0qH7ZDJi7xMGw" style = "margin-left:-30px;">'+display+'</div><button id = "'+id+'" aria-checked="true" class="_2e2g485kpErHhJQUiyvvC2 _179edq2yfZswDIo3NdeebM _1L5kUnhRYhUJ4TkMbOTKkI" role="switch" type="button"><div class="_2FKpII1jz0h6xCAw1kQAvS"></div></button></a>';
        else
            return '<a data-redditstyle="true" class="_1YWXCINvcuU7nk0ED-bta8" class = "fixRedditCustomMenuB"><div class="vzhy90YD0qH7ZDJi7xMGw" style = "margin-left:-30px;">'+display+'</div><button id = "'+id+'" aria-checked="false" class="_2e2g485kpErHhJQUiyvvC2 _179edq2yfZswDIo3NdeebM" role="switch" type="button"><div class="_2FKpII1jz0h6xCAw1kQAvS"></div></button></a>';
    }

    function RemoveMenu(){
        $("#redditFixReloadAll").remove();
        $("#redditFixReload25").remove();
    }
    function AddMenu(){
        var menu = $("._2pUO1Sfe7WlIHvq6goN3Pz");
        if (menu.find(".customRedditFixMenu").length > 0 )
            return;
        menu.append(getMenuItem('redditFixReloadAll', 'Reload All'));
        $("#redditFixReloadAll").click(function(){
            for (var i = topicsInMemory.length - 1; i >= 0; --i) {
                var el = topicsInMemory.pop(i);
                $(".rpBJOHq2PR60pnwJlUyP0").prepend(el);
            }
            maxOffset = $(document).height();
        });
        menu.append(getMenuItem('redditFixReload25', 'Reload 25'));
        $("#redditFixReload25").click(function(){
            var reloadTill = topicsInMemory.length;
            if (reloadTill > 25)
                reloadTill = 25;
            for (var i = 0; i < 25; ++i) {
                var el = topicsInMemory.pop(i);
                $(".rpBJOHq2PR60pnwJlUyP0").prepend(el);
            }
            maxOffset = $(document).height();
        });
     }

    $("#email-collection-tooltip-id").click(function(){
        function _appendMenu() {
            var menuMain = $('div[role="menu"]');
            var isReady = menuMain.length > 0;
            if (!isReady) {
                setTimeout(_appendMenu, 100);
                return;
            }
            if (menuMain.find("#fixRedditCustomMenuB").length == 0){
                menuMain.find('a:last').before(getCheckBoxItem(commentEffects, "redditFixCheckBoxBackground", "Comment effects"));
                $("#redditFixCheckBoxBackground").click(function(){
                    var btnBackgroundsChecked = $(this);
                    if (btnBackgroundsChecked.hasClass("_1L5kUnhRYhUJ4TkMbOTKkI")){
                        btnBackgroundsChecked.removeClass("_1L5kUnhRYhUJ4TkMbOTKkI");
                        localStorage.setItem("commentEffects", false);
                        commentEffects = "false";
                    }
                    else{
                        btnBackgroundsChecked.addClass("_1L5kUnhRYhUJ4TkMbOTKkI");
                        localStorage.setItem("commentEffects", true);
                        commentEffects = "true";
                    }
                });
                menuMain.find('a:last').before(getCheckBoxItem(holdTopicsInMemory, "fixRedditKeepTopicsInMemory", "Save topics in ram"));
                $("#fixRedditKeepTopicsInMemory").click(function(){
                    var btnTopicsChecked = $(this);
                    if (btnTopicsChecked.hasClass("_1L5kUnhRYhUJ4TkMbOTKkI")){
                        btnTopicsChecked.removeClass("_1L5kUnhRYhUJ4TkMbOTKkI");
                        localStorage.setItem("holdTopicsInMemory", false);
                        holdTopicsInMemory = "false";
                        RemoveMenu();
                    }
                    else{
                        btnTopicsChecked.addClass("_1L5kUnhRYhUJ4TkMbOTKkI");
                        localStorage.setItem("holdTopicsInMemory", true);
                        holdTopicsInMemory = "true";
                        AddMenu();
                    }
                });
                menuMain.find('a:last').before(getCheckBoxItem(originalBehavior, "fixRedditoriginalBehavior", "Original behavior"));
                $("#fixRedditoriginalBehavior").click(function(){
                    var btnTopicsChecked = $(this);
                    if (btnTopicsChecked.hasClass("_1L5kUnhRYhUJ4TkMbOTKkI")){
                        btnTopicsChecked.removeClass("_1L5kUnhRYhUJ4TkMbOTKkI");
                        localStorage.setItem("originalBehavior", false);
                        originalBehavior = "false";
                    }
                    else{
                        btnTopicsChecked.addClass("_1L5kUnhRYhUJ4TkMbOTKkI");
                        localStorage.setItem("originalBehavior", true);
                        originalBehavior = "true";
                    }
                });
                menuMain.find("a:last").before('<div class="_7cxLZzQcuE-aYbch5G9oN"></div>');
            }

        }
        _appendMenu();
    });

    function attachObserver(){
        if ($(".observerIsAttached").length > 0)
            return;
        $(".rpBJOHq2PR60pnwJlUyP0").addClass("observerIsAttached");
        var config = { attributes: false, childList: true, subtree: true };
        var targetNodeRoot = $(".rpBJOHq2PR60pnwJlUyP0").first().get(0);
        var configRoot = { attributes: false, childList: true, subtree: true };

        var callbackRoot = function(mutationsList, observer) {
            for(var mutation of mutationsList) {
                mutation.addedNodes.forEach(function(node) {
                    if ($(node).find(".scrollerItem")){
                        if ($(".scrollerItem").length > 50){
                            $(".scrollerItem").slice(0,9).each(function(){
                                if ($(this).parent().parent().attr("style") != ""){
                                    var el = $(this);
                                    if (el.offset().top == 0){
                                        if (holdTopicsInMemory)
                                            topicsInMemory.push(el.parent().parent());
                                        el.parent().parent().remove();
                                    }
                                }
                            });
                        }
                    }
                });
            }
        };

        var observerroot = new MutationObserver(callbackRoot);
        observerroot.observe(targetNodeRoot, config);
    }

    function callback() {
        if (originalBehavior == "true")
            return;
        if (holdTopicsInMemory == "true")
            AddMenu();
        var st = $(document).scrollTop();
        if (st > maxOffset)
        {
            if (st > lastScrollTop){
                attachObserver();
            }
            lastScrollTop = st;
            maxOffset = 0;
        }
    }
})();