// ==UserScript==
// @name         Robin Enhancement Script
// @namespace    https://www.reddit.com/
// @version      1.0
// @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();

    /**
     * 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)) ||
            // repeating chars in line (more than 5). e.g. aaaaaaa !!!!!!!!
            (/(.)\1{5,}/.test(line)) ||
            // Some common messages
            (/(voting will end in approximately|\[robin-grow\]|\[i spam the most used phrase\]|\[message from creator\])/.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)
        );
    };

    /**
     * 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);
    };

    /**
     * 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();

        // Spam filter
        if (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);
        }
    };

    // 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 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");
            }
        });
    });

    // 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);

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