// ==UserScript==
// @name         Robin Enhancement Script
// @namespace    https://www.reddit.com/
// @version      1.6
// @description  Highlight mentions, auto link links & automatically remove spam
// @author       mr_bag
// @match        https://www.reddit.com/robin/
// @grant        none
// ==/UserScript==
(function() {

    // Grab users username + play nice with RES
    var robin_user = $("#header-bottom-right .user a").first().text();
    var ignored_users = {};

    /**
     * Check if a message is "spam"
     */
    var is_spam = function(line){
        return (
            // Hide auto vote messages
            (/^voted to (grow|stay|abandon)/.test(line)) ||
            // random unicode?
            (/[\u0080-\uFFFF]/.test(line)) ||
            // hide any auto voter messages
            (/\[.*autovoter.*\]/.test(line)) ||
            // Common bots
            (/^(\[binbot\]|\[robin-grow\])/.test(line)) ||
            // repeating chars in line (more than 5). e.g. aaaaaaa !!!!!!!!
            (/(.)\1{5,}/.test(line)) ||
            // Some common messages
            (/(voting will end in approximately|\[i spam the most used phrase\]|\[message from creator\])/.test(line)) ||
            // no spaces = spam if its longer than 25 chars (dont filter links)
            (line.indexOf(" ") === -1 && line.length > 25 && line.indexOf("http") === -1) ||
            // repeating same word
            /(\b\S+\b)\s+\b\1\b/i.test(line)
        );
    };

    /**
     * Check if a message is from an ignored user
     *
     */
    var is_ignored = function($usr, $ele){
        // no user name, go looking for when said it
        if($usr.length === 0){
            while($usr.length === 0){
                $ele = $ele.prev();
                $usr = $ele.find(".robin--username");
            }
        }
        // are they ignored?
        return (ignored_users[$usr.text()]);
    };

    /**
     * Make links clickable
     *
     */
    var auto_link = function($msg){
        var text = $msg.html(); // read as html so stuff stays escaped
        // normal links
        text = text.replace(/\b(?:https?|ftp):\/\/[a-z0-9-+&@#\/%?=~_|!:,.;]*[a-z0-9-+&@#\/%=~_|]/gim, '<a target="blank" href="$&">$&</a>');
        // reddit subreddit links
        text = text.replace(/ \/r\/(\w+)/gim, ' <a target="blank" href="https://reddit.com/r/$1">/r/$1</a>');
        // update text
        $msg.html(text);
    };

    /**
     * Mute a user
     */
    var _mute_user = function(usr){
        // Add to ignore list
        ignored_users[usr] = true;
        _render_muted_list();
    };

    /**
     * un-mute a user
     */
    var _unmute_user = function(usr){
        // Add to ignore list
        delete ignored_users[usr];
        _render_muted_list();
    };

    // Render list of ignored users
    var _render_muted_list = function(){
        var html = "<strong>Ignored users</strong><br>";
        for(var u in ignored_users){
            html += "<div data-usr='"+ u + "'>" + u + " - [unmute]</div>";
        }
        $("#muted_users").html(html);
    };

    // Scroll chat back to bottom
    var _scroll_to_bottom = function(){
        $("#robinChatWindow").scrollTop($("#robinChatMessageList").height());
    };

    /**
     * Parse a link and apply changes
     */
    var parse_line = function($ele){
        var $msg = $ele.find(".robin-message--message");
        var $usr = $ele.find(".robin--username");

        var line = $msg.text().toLowerCase();

        // If user is ignored or message looks like "Spam". hide it
        if (is_ignored($usr, $ele) || is_spam(line)) {
            $ele.addClass("spam-hidden");
        }

        // Highlight mentions
        if(line.indexOf(robin_user) !== -1){
            $ele.css("font-weight", "bold");
        }

        // Make links clickable
        if(line.indexOf("http") !== -1){
            auto_link($msg);
        }

        // Add mute button to users
        if(!$ele.hasClass("robin--user-class--system") && $usr.text() != robin_user){
            $("<span style='font-size:.8em;cursor:pointer'> [mute] </span>").insertBefore($usr).click(function(){
                _mute_user($usr.text());
            });
        }

        // Add filter support
        if(line.indexOf("%") === 0){ $ele.addClass("filter-percent");}
        if(line.indexOf("$") === 0){ $ele.addClass("filter-dollar");}
        if(line.indexOf("#") === 0){ $ele.addClass("filter-hash"); }
    };

    // Detect changes, are parse the new message
    $("#robinChatWindow").on('DOMNodeInserted', function(e) {
        if ($(e.target).is('div.robin-message')) {
            // Apply changes to line
            parse_line($(e.target));
        }
    });

    // When everything is ready
    $(document).ready(function(){
        // Set default spam filter type
        $("#robinChatWindow").addClass("hide-spam");

        // Add checkbox to toggle "hide" behaviors
        $("#robinDesktopNotifier").append("<label><input type='checkbox' checked='checked'>Hide spam completely</label>").click(function(){
            if($(this).find("input").is(':checked')){
                $("#robinChatWindow").removeClass("mute-spam").addClass("hide-spam");
            }else{
                $("#robinChatWindow").removeClass("hide-spam").addClass("mute-spam");
            }
            // correct scroll after spam filter change
            _scroll_to_bottom();
        });

        // Add Muted list & hook up unmute logic
        $('<div id="muted_users" class="robin-chat--sidebar-widget robin-chat--notification-widget"><strong>Ignored users</strong></div>').insertAfter($("#robinDesktopNotifier"));
        $('#muted_users').click(function(e){
            var user = $(e.target).data("usr");
            if(user) _unmute_user(user);
        });

        // Hook up toggles for filters
        $('<div id="filter_mode">Filter: <span data-filter="*">Show all</span> | <span data-filter="%">% Only</span> | <span data-filter="$">$ Only</span> | <span data-filter="#"># Only</span> | <span data-filter="hide">No channels</span></div>').insertAfter("#robinSendMessage").click(function(e){
            var filter = $(e.target).data("filter");
            if(filter === '*'){
                $("#robinChatWindow").removeClass("filter_on").removeAttr("data-filter").removeClass("filter_all_channels");
            }else if(filter === 'hide'){
                $("#robinChatWindow").removeClass("filter_on").removeAttr("data-filter").addClass("filter_all_channels");
            }else{
                $("#robinChatWindow").addClass("filter_on").attr("data-filter", filter);
            }
            // correct scroll after filter change
            _scroll_to_bottom();
        });
        // Auto append % when in filtered mode
        $("#robinSendMessage").submit(function(){
            if($("#robinChatWindow").hasClass("filter_on")){
                if($(".text-counter-input").val().indexOf("/") !== 0){ // /commands should work as normal
                    $(".text-counter-input").val($("#robinChatWindow").attr("data-filter") + " " + $(".text-counter-input").val());
                }
            }
        });
    });

    // Add initial styles for "spam" messages
    document.styleSheets[0].insertRule("#robinChatWindow.hide-spam div.robin-message.spam-hidden { display:none; }", 0);
    document.styleSheets[0].insertRule("#robinChatWindow.mute-spam div.robin-message.spam-hidden { opacity:0.3; font-size:1.2em; }", 0);

    // filter styles
    document.styleSheets[0].insertRule("#robinChatWindow.filter_on div.robin-message { display:none; }", 0);
    document.styleSheets[0].insertRule("#robinChatWindow.filter_on[data-filter='$'] div.robin-message.filter-dollar,#robinChatWindow.filter_on[data-filter='%'] div.robin-message.filter-percent,#robinChatWindow.filter_on[data-filter='#'] div.robin-message.filter-hash,#robinChatWindow.filter_on div.robin-message.robin--user-class--system  { display:block; }", 0);
    document.styleSheets[0].insertRule("#robinChatWindow.filter_all_channels div.robin-message.filter-dollar,#robinChatWindow.filter_all_channels  div.robin-message.filter-hash, #robinChatWindow.filter_all_channels div.robin-message.filter-percent { display:none; }", 0);

    document.styleSheets[0].insertRule("#filter_mode span { cursor: pointer;}", 0);

    // muted user box
    document.styleSheets[0].insertRule("#muted_users { font-size:1.2em; }", 0);
    document.styleSheets[0].insertRule("#muted_users div { padding: 2px 0; }", 0);
    document.styleSheets[0].insertRule("#muted_users strong { font-weight:bold; }", 0);

    // FIX RES nightmode (ish)
    document.styleSheets[0].insertRule(".res-nightmode #robinChatWindow div.robin-message { color: #ccc; }", 0);
})();