// ==UserScript==
// @name         Robin chat enhancement script
// @namespace    https://www.reddit.com/
// @version      0.3
// @description  Highlight @you messages, hide spam & auto link links
// @author       mr_bag
// @match        https://www.reddit.com/robin/
// @grant        none
// ==/UserScript==

(function() {

    // for highlighting messages mentioning the current user
    var robin_user = $("#header-bottom-right .user a").first().text();

    // Handle each line
    var parse_line = function($ele){
        var $msg = $ele.find(".robin-message--message");
        var line = $msg.text().toLowerCase();

        // Spam filter
        if (
            // Hide auto vote messages
            (/voted to (grow|stay|abandon)/.test(line)) ||
            // Unicode?
            (/[\u0080-\uFFFF]/.test(line)) ||
            // hide some auto voter messages
            (/\[.*autovoter.*\]/.test(line)) ||
            // repeating chars in line (more than 6). e.g. aaaaaaa !!!!!!!!
            (/(.)\1{6,}/.test(line))
        ) {
            $ele.css("opacity","0.3");
        }

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

        // Auto link links
        if(line.indexOf("http") !== -1){
            var text = $msg.html(); // with caps etc (read as html so stuff stays escaped)
            // normal links
            text = text.replace(/\b(?:https?|ftp):\/\/[a-z0-9-+&@#\/%?=~_|!:,.;]*[a-z0-9-+&@#\/%=~_|]/gim, '<a target="blank" href="$&">$&</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);
        }
    };

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

    // stop stacking unicode chars escaping the original message
    document.styleSheets[0].insertRule(".robin-message--message {overflow:hidden;}", 0);
})();