// ==UserScript==
// @name         New Userscript
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.nextinpact.com/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    //###########

    var addStyle =function(){
        /*
        add new style to document head
        */
        var cssTodaySubtitle='.TodaySubtitle{color:#ea7e19}';
        var head=document.head;
        var style=document.createElement('style');
        head.appendChild(style);
    }

    var today = new Date();
    // todayStr fomat : "dd/mm/yyyy -"
    var todayStr=(today.toLocaleString('fr-FR', { timeZone: 'UTC' })).substring(0,10)+ " -"

    var isToday=function(dateStr){
        /*
        return if dateStr correspond to today date
        */
        return dateStr==todayStr;
    }

    var applyTodayModif=function(sbtDateElem){
        /*
        apply modification on sbtDateElem elem.
        */
        sbtDateElem.innerHTML='<span class="TodaySubtitle">Aujourd\'hui -';
    }

    var modifTodayDate=function(sbtDateElem){
        /*
        apply modification on sbtDateElem elem if sbtDateElem correspond to today date.
        */
        var dateStr=sbtDateElem.innerHTML;
        if(isToday(dateStr)){
            applyTodayModif(sbtDateElem);
        }
    }

    //###########

    //add style to document
    addStyle()
    //add obserder to modify date as soon as document is modify
    var observed=document;
    var observeOpt={childList: true, substree: true};
    var observerFunc=function(mutations){
        /*
        find all subtitle dates elem in document and apply modification if this elem correspond to today date
        */
        var subtitleDates=document.querySelectorAll(".subtitle span");
        for(let i=0; i<subtitleDates.length; i++){
            modifTodayDate(subtitleDates[i])
        }
    }
    //apply a first the the observFunc if page is already load.
    // XXX : because JavaScript is monothread, this should be directly followed by the observer.
    observerFunc(null);
    //look for modification in observed to change if necessary
    //FIXME : may be launched 2 times in a row, because the modification may be also observed
    var mutationObs1=new MutationObserver(observerFunc).observe(observed, observeOpt);
})();