// ==UserScript==
// @name New Userscript
// @namespace http://tampermonkey.net/
// @version 0.1
// @description try to take over the world!
// @author You
// @match https://notes.iut-nantes.univ-nantes.fr/
// @grant none
// ==/UserScript==

(function() {
'use strict';

class Note {
constructor(htmlNote) {
this.nom = parseFloat($(htmlNote.children()[2]).text());
this.note = parseFloat($(htmlNote.children()[4]).text());
let coeffString = $(htmlNote.children()[6]).text();
this.coeff = parseFloat(coeffString.substr(1, coeffString.length-2));

if(isNaN(this.note) || isNaN(this.coeff)) {
this.note = 0;
this.coeff = 0;
}

htmlNote.append('<td class="notesAdded"></td>');
}
}

class Module {
constructor(htmlModule) {
this.number = parseFloat($(htmlModule.children()[1]).text());
this.name = $(htmlModule.children()[2]).text();
this.coeff = parseFloat($(htmlModule.children()[6]).text());
this.notes = [];

let nextRow = $(htmlModule);
while(nextRow.next().length > 0 &&
!$(nextRow.next()[0]).hasClass('notes_bulletin_row_mod')) {
nextRow = nextRow.next();
if(nextRow.hasClass('notes_bulletin_row_eval')) {
this.notes.push(new Note(nextRow));
}
}

htmlModule.append(`<td class="notesAdded">${(this.notes.length > 0) ?
(Math.round(this.getMoyenne()*100)/100) : 'N.A.'}</td>`);
}

getMoyenne() {
let notesSum = this.notes
.reduce((sum, note) => sum+note.note*note.coeff, 0);
let coeffSum = this.notes
.map((note) => note.coeff)
.reduce((sum, coeff) => sum+coeff, 0);

if(coeffSum === 0 || notesSum === 0) {
return 0;
} else {
return notesSum / coeffSum;
}
}
}

class UE {
constructor(htmlUE) {
this.numero = null;
this.coeff = parseFloat($(htmlUE.children()[6]).text());
this.modules = [];

let nextRow = $(htmlUE);
while(nextRow.next().length > 0 &&
!$(nextRow.next()[0]).hasClass('notes_bulletin_row_ue')) {
nextRow = nextRow.next();
if(nextRow.hasClass('notes_bulletin_row_mod')) {
this.modules.push(new Module(nextRow));
}
}

htmlUE.append(`<td
class="notesAdded">${Math.round(this.getMoyenne()*100)/100}</td>`);
}

getMoyenne() {
let moyennesSum = this.modules
.reduce((sum, module) => {
return sum+module.getMoyenne()*module.coeff;
}, 0);
let coeffSum = this.modules
.filter((module) => module.getMoyenne() > 0)
.map((module) => module.coeff)
.reduce((sum, coeff) => sum+coeff, 0);

if(coeffSum === 0) {
return 0;
} else {
return moyennesSum / coeffSum;
}
}
}

class Tableau {
constructor(htmlTable) {
this.ues = [];
this.moyenne = -1;

htmlTable.find('thead tr:first').append('<th class="notesAdded"></th>');

let body = htmlTable.find('tbody');

body.children().each((i, child) => {
child = $(child);
if(child.hasClass('notes_bulletin_row_ue')) {
this.ues.push(new UE(child));
}
});
}

getMoyenne() {
let moyennesSum = this.ues
.reduce((sum, ue) => sum+ue.getMoyenne()*ue.coeff, 0);
let coeffSum = this.ues
.map((ue) => ue.coeff)
.reduce((sum, coeff) => sum+coeff, 0);

return moyennesSum / coeffSum;
}
}

let tab;
function render() {
$('.notesAdded').remove();
tab = new Tableau($('table.notes_bulletin'));
console.log(tab);
$('table').before(`<span class="notesAdded"style="text-align: center;
padding: 20px; border: 3px solid red; display: block; margin: 0 20px
20px;"><b>Moyenne générale:
${Math.round(tab.getMoyenne()*100)/100}</b></span>`);
// alert('Votre moyenne est ' + Math.round(tab.getMoyenne()*100)/100);
}
render();

if($('table.notes_bulletin')) {
render();
} else {
console.log('Le tableau de note n\'à pas été trouvé');
}

})();