// ==UserScript==
// @name         CF Performance
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Adds the performance column to the users codeforces contest list page
// @author       PikMike
// @include      *codeforces.*/contests/with/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var table = $("table.user-contests-table");

    $( table )
        .unbind('appendCache applyWidgetId applyWidgets sorton update updateCell')
        .find('thead th')
        .unbind('click mousedown');

    $( table ).children().first().children().each( function( index, row ){
        $('<th style="padding-right: 1.5em;" class="top header">Performance</th>').insertAfter( $( row ).children().eq(3) );
    });

    $( table ).children().last().children().each( function( index, row ){
        var newRating = parseInt( $( row ).children().eq(5).html() );
        var delta = parseInt( $( row ).children().eq(4).children().first().html() );
        var oldRating = newRating - delta;
        var performance = oldRating + 4 * delta;
        $("<td" + (index & 1 ? '' : ' class="dark"') + ">" + performance + "</td>").insertAfter( $( row ).children().eq(3) );
    });

    $( table ).tablesorter({
        headers: {
            1: {
                sorter: false
            },
            7: {
                sorter: false
            }
        }
    });
})();