// ==UserScript==
// @name     YOUR_SCRIPT_NAME
// @include  https://dochazka.lan.ufe.cz/*
// @require  http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @grant    GM_addStyle
// ==/UserScript==
//--- The @grant directive is used to restore the proper sandbox.

var hrsNode = document.querySelector("body > div:nth-child(7) > table:nth-child(1) > tbody > tr:nth-child(2) > td:nth-child(1)");
var minsNode = document.querySelector("body > div:nth-child(7) > table:nth-child(1) > tbody > tr:nth-child(2) > td:nth-child(2)");
var secsNode = document.querySelector("body > div:nth-child(7) > table:nth-child(1) > tbody > tr:nth-child(2) > td:nth-child(3)");
var workedDaysNode = document.querySelector("body > div:nth-child(7) > table:nth-child(3) > tbody > tr:nth-child(2) > td:nth-child(1)");
var workDaysNode = document.querySelector("body > div:nth-child(7) > p > strong > i > font:nth-child(1)");
var sickDaysNode = document.querySelector("body > div:nth-child(7) > table:nth-child(3) > tbody > tr:nth-child(2) > td:nth-child(3)");
var vacaDaysNode = document.querySelector("body > div:nth-child(7) > table:nth-child(3) > tbody > tr:nth-child(2) > td:nth-child(4)");
var appender = document.querySelector("body > div:nth-child(7)");

// Parametry
var UVAZEK = 0.4;
var DNY_ZA_TYDEN = 3;

// Ze stránky
var workedHours = Number(hrsNode.innerHTML.replace(/\ /g, ''));
var workedMinutes = Number(minsNode.innerHTML.replace(/\ /g, ''));
var workedSeconds = Number(secsNode.innerHTML.replace(/\ /g, ''));
var workedDays = Number(workedDaysNode.innerHTML.replace(/\ /g, ''));
var sickDays = Number(sickDaysNode.innerHTML.replace(/\ /g, ''));
var vacaDays = Number(vacaDaysNode.innerHTML.replace(/\ /g, ''));
var workDays = Number(workDaysNode.innerHTML.replace(/\ /g, ''));

// Výpočty
var workedTime = workedHours+workedMinutes/60+workedSeconds/3600;
var myWorkDays = workDays*UVAZEK;

// Current
var requiredHours = (myWorkDays-sickDays-vacaDays)*8+0.5*workedDays;
var missingHours = requiredHours-workedTime;

// Guessed
var guessedLunchDays = Math.ceil((myWorkDays-sickDays-vacaDays)*DNY_ZA_TYDEN/(UVAZEK*5));
var guessedRequiredHours = (myWorkDays-sickDays-vacaDays)*8+0.5*guessedLunchDays;
var guessedMissingHours = guessedRequiredHours-workedTime;


appender.insertAdjacentHTML( 'beforebegin', `
<center>
<table border="1" cellpadding="3" cellspacing="0" width="35%" style="margin-bottom:20px;">
  <tr><td bgcolor=#90ee90><strong>Zbývá&nbsp;odchodit</strong></td><td>${Math.round(missingHours*10, 2)/10}&nbsp;hodin</td></tr>
  <tr><td bgcolor=#90ee90><strong>Pracovních&nbsp;dní</strong></td><td>${Math.round(missingHours/24*10, 2)/10}</td></tr>
  <tr><td bgcolor=#90ee90><strong>Zbývá&nbsp;odch.&nbsp;<sup>odhad</sup></strong></td><td>${Math.round(guessedMissingHours*10, 2)/10}&nbsp;hodin</td></tr>
  <tr><td bgcolor=#90ee90><strong>Prac.&nbsp;dní&nbsp;<sup>odhad</sup></strong></td><td>${Math.round(guessedMissingHours/24*10, 2)/10}</td></tr>
</table>
</center>
` );