tampermonkey script for hashflare history log parsing

hfcalc.user.js

// ==UserScript==
// @name HFCalc
// @description Подсчёт текущей профитности майнинга по истории
// @author Gourytch
// @license WTFPL
// @version 1.1
// @require https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js
// @include https://hashflare.io/panel/history
// ==/UserScript==
(function (window, undefined) {
    var w;
    if (typeof unsafeWindow !== undefined) {
        w = unsafeWindow;
    } else {
        w = window;
    }
    if (w.self != w.top) {
        return;
    }
    if (!/https:\/\/hashflare.io\/panel\/history.*/.test(w.location.href)) {
        return;
    }
    $('body').prepend('<div id="hfcdiv">'+
                      '<button id="hfcbtn">HFCalc</button>'+
                      '<div id="hfc"/>'+
                      '<pre id="hfclog"></pre>'+
                      '</div>');
    function LogClear(s) {
        $('#hfclog').text('');
    }
    function Log(s) {
        $('#hfclog').text($('#hfclog').text() + s + '\n');
    }
    $('#hfcbtn').click(function() {
        var C = $("#DataTables_Table_0"); // Contracts
        if (!C.length) {
            Log("Contracts table missing");
            return;
        }
        var L = $("#DataTables_Table_3"); // Log
        if (!L.length) {
            Log("Log table missing");
            return;
        }
        var Hash = function(name, usd) { // name and amount of investments in usd
            this.name = name;
            this.usd = usd;
            this.invested = null;
            this.d0 = null;
            this.d1 = null;
            this.sum = 0;
            this.process = function(day, amount) {
                if (this.d0 === null || day < this.d0) this.d0 = day;
                if (this.d1 === null || this.d1 < day) this.d1 = day;
                this.sum += amount;
            };
            this.days = function() {
                if (this.d0 === null || this.d1 === null) { return NaN; }
                return Math.abs(this.d1 - this.d0) + 1;
            };
            this.daily = function() {
                return this.sum / this.days();
            };
            this.annual = function() {
                return this.daily() * 365;
            };
            this.rate = function() {
                return 100 * this.annual() / this.invested;
            };
            this.row = function() {
                return "<tr><th>" +
                    this.name + "</th><td>" +
                    this.sum.toFixed(8) + "</td><td>" +
                    this.days() + "</td><td>" +
                    this.daily().toFixed(8) + "</td><td>" +
                    this.annual().toFixed(8) + "</td><td>$" +
                    this.usd.toFixed(2) + "</td><td>" +
                    this.invested.toFixed(8) + "</td><td>" +
                    this.rate().toFixed(2) + "%</td></tr>";
            };
        };
        var sha256_amount = 0;
        var scrypt_amount = 0;
        C.find('tr').each(function (rowIndex, r) {
          var cols = [];
          $(this).find('td').each(function (colIndex, c) {
            cols.push(c.textContent);
          });
          if (cols.length <= 4) { return; } // skip it
          var t = cols[1];
          var v = parseInt(cols[2]);
          if (t == 'SHA-256') sha256_amount += v;
          if (t == 'Scrypt') scrypt_amount += v;
        });
        var btc_price = null;
        var sha256_price = 1.20 / 10;   // $1.20 per 10 GH/s
        var scrypt_price = 8.20;        // $8.20 per 1 MH/s
        var sha256_fee   = 0.0035 / 10; // $0.0035 per 10 GH/s
        var scrypt_fee   = 0.01;        // $0.01 per 1 MH/s

        var sha256 = new Hash('sha256', sha256_price * sha256_amount);
        var scrypt = new Hash('scrypt', scrypt_price * scrypt_amount);
        s2days = function(s) {
            var v = s.split(" ", 1)[0].split(".");
//            Log("<" + s + "> -> <" + v + ">");
            var o = new Date(2000 + parseInt(v[2]), parseInt(v[1]), parseInt(v[0]));
//            Log("... -> <" + o + ">");
            var d = Math.floor(o.getTime() / (1000 * 60 * 60 * 24));
//            Log("... -> <" + d + ">");
            return d;
        };
        LogClear();
        L.find('tr').each(function (rowIndex, r) {
          var cols = [];
          $(this).find('td').each(function (colIndex, c) {
            cols.push(c.textContent);
          });
          if (cols.length <= 4) { return; } // skip it
          var t = cols[0];
          var d = s2days(cols[1]);
          var v = parseFloat(cols[2]);
//          Log(d+">>> \""+t+"\" "+v);
          if (t == 'SHA-256 payout (BTC)') sha256.process(d, +v);
          if (t == 'Scrypt payout (BTC)') scrypt.process(d, +v);
          if (t == 'SHA-256 maintenance (BTC)') {
              sha256.process(d, -v);
              // calculate btc price in usd from fee
              btc_price = v / sha256_fee;
//              Log("found BTC price from SHA-256 Fee: " + v.toFixed(8) + " BTC / " + sha256_fee + " USD = " + btc_price.toFixed(8));
          }
          if (t == 'Scrypt maintenance (BTC)') {
            scrypt.process(d, -v);
            // calculate btc price in usd from fee
            btc_price = v / scrypt_fee;
//            Log("found BTC price from Scrypt Fee: " + v.toFixed(8) + " BTC / " + scrypt_fee + " USD = " + btc_price.toFixed(8));
          }
        });
        // fill gaps
        sha256.invested = sha256.usd * btc_price;
        scrypt.invested = scrypt.usd * btc_price;
//        Log("sha256=" + sha256.sum + "; scrypt=" + scrypt.sum);
        $('#hfc').html("<table id='hfc_tab' border='1'>" +
                       "<tr><th>name</th><th>sum</th><th>days</th><th>daily</th><th>annual</th><th colspan='2'>invested</th><th>rate</th></tr>" +
                       sha256.row() +
                       scrypt.row() +
                       "</table>");
        $('#hfc_tab th').css({'padding':'2px 10px', 'text-align':'center'});
        $('#hfc_tab td').css({'padding':'2px 10px', 'text-align':'right'});
//        Log("------- finished --------");
    });
    $('#hfcdiv').css("background-color", "#fffff0");
})(window);