// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Handle add/remove competency links.
 *
 * @module     format_iena/suivi
 * @package    format_iena
 * @copyright  2021 Myriam Delaruelle
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
define(['jquery', 'core/ajax', 'core/templates', 'core/str'],
       function($, ajax, templates, str) {
       	var all_selected=false;
       	var data=[];
       	return{
       		registerFilters:function(){
       			
	    		$("#group-select").on('change', function(e){
	    			changeGroup();
	    		});
	    		
       		},
       		
       		registerSubmit:function(infos){
       			data=infos;
       			$("#id_submit_iena").on('click', function(e){
	    			triggerAction(e);
	    		});
	    		$("#section-select").on('change', function(){
	    			changeSection();
	    		});
	    		$("#filter-select").on('change', function(){
	    			changeCompletion();
	    		});
	    		$("#symbol-select").on('change', function(){
	    			changeCompletion();
	    		});
	    		
	    		changeSection();
	    		/*calcPercentage(data);
	    		changeCompletion();*/
       		}
       		

       		
       		
       	}

    function getCompleteUrl(){
    	url=window.location.search;
    	urlParams = new URLSearchParams(url);
    	courseid=urlParams.get('courseid');
    	groupid=$("#group-select").val();
    	sectionid=$("#section-select").val();
    	filter=$("#symbol-select").val() + $("#filter-select").val();
    	completeUrl='suivi_unit.php?courseid='+courseid;
    	if(sectionid){
    		completeUrl+='&sectionid='+sectionid;
    	}
    	if(groupid){
    		completeUrl+="&groupid="+groupid;
    	}
    	if(filter){
    		completeUrl+="&filter="+filter;
    	}
    	return completeUrl;
    }

    function changeGroup(){
    	completeUrl=getCompleteUrl();
    	loadMessage("loading");
    	$.ajax({ url: completeUrl,
        	data: {action: 'test'},
        	type: 'post',
        	success: function(request) { 
        		console.log(JSON.parse(request));
        		
        		data=calcPercentage(JSON.parse(request));
        		changeCompletion();
         		//reloadTable(JSON.parse(request));	
			}
		});
    }

  
    function changeCompletion(){
    	console.log(data);
    	symbol=$("#symbol-select").val();
    	filter=$("#filter-select").val();
    	data.count_results=0;
    	for(var i=0; i<data.students.length; i++){
    		if(symbol=="<"){
    			if(data.students[i].percentage <= filter){
    				data.count_results++;
    				data.students[i].visible=true;
    			}
    			else{
					data.students[i].visible=false;
    			}
    		}
    		else if(symbol==">"){
    			if(data.students[i].percentage >= filter){
    				data.count_results++;
    				data.students[i].visible=true;
    			}
    			else{
					data.students[i].visible=false;
    			}
    		}
    		else{
    			if(data.students[i].percentage == filter){
    				data.count_results++;
    				data.students[i].visible=true;
    			}
    			else{
					data.students[i].visible=false;
    			}
    		}
    		
    	}
    	reloadTable(data);
    }

    //on va devoir calculer le pourcentage, check la completion et reload la table à chaque fois

    function changeSection(){
    	loadMessage("loading");
    	sectionid=$("#section-select").val();
    	data.count_results=0;
    	for(var i = 0; i<data.modules.length; i++){
    		if(data.modules[i].section == sectionid || sectionid == 0){
    			data.modules[i].visible=true;
    			data.count_results++;
    			for(var j = 0; j<data.students.length; j++){
    				var prog=data.students[j].progress.find(progress => progress.idmodule === data.modules[i].id);
					prog.visible=true;
    			}
    		}
    		else{
    			data.modules[i].visible=false;
    			for(var j = 0; j<data.students.length; j++){
    				data.students[j].progress.find(progress => progress.idmodule === data.modules[i].id).visible=false;
    			}
    		}
    	}
    	
    	if(data.count_results==0){
    		reloadTable(data);
    	}
    	else{
    		data=calcPercentage(data);
    		changeCompletion();
    		//reloadTable(data);
    	}

    	
    	
    	//reloadTable(data);
    }

    function loadMessage(type){
    	console.log("on load");
    	if(type=="loading"){
    		var message = str.get_string('loadingResults', 'format_iena');
	    	
    	}
    	else if(type=="error"){
			var message = str.get_string('errorLoadingResults', 'format_iena');
    	}

    	$.when(message).done(function(localizedEditString) {
		    $("#partial-table").html("<div class='alert alert-primary' role='alert'>"+localizedEditString+"</div>");
		});	
    }

    function reloadTable(params){
    	console.log(params);
    	url=getCompleteUrl();
    	templates.render('format_iena/suivi-table', params)
     	.done(function(html, js){
     		console.log("done done");
     		 $("#partial-table").html(html);
     		 templates.runTemplateJS(js);
     		 window.history.pushState('suivi',"", url);
     	})
        .fail(function(){
        	loadMessage("error");
        });	
    }




	function getSelectedStudents(){
		var selectedChecks=$("#table-body input:checked");
		var students=[];
		for(var i=0; i < selectedChecks.length; i++){
			
			students.push(selectedChecks[i].value);
		}
	
		return students;

	}

	//Si on veut envoyer un message à tout le monde on ajoute deux champs cachés :
	//La liste des étudiants (array d'id)
	//L'url de retour pour revenir sur le tableau de suivi
	function triggerAction(e){
		value=$("#select-actions-suivi-iena").val();
		
		if(value=="msg"){
			url=window.location.search;
    		urlParams = new URLSearchParams(url);
    		courseid=urlParams.get('courseid');
			students=getSelectedStudents();
			var form=$("#form_send_message_iena");
			form.attr("action", "send_message.php?courseid="+courseid);
			var field=$("<input></input>");
			field.attr("type", "hidden");
        	field.attr("name", "students");
        	field.attr("value", students.toString());
        	form.append(field);
        	var fieldUrl=$("<input></input>");
			fieldUrl.attr("type", "hidden");
        	fieldUrl.attr("name", "back_url");
        	fieldUrl.attr("value", url);
        	form.append(fieldUrl);
        	$(document.body).append(form);
    		form.submit();
		}
		else if(value=="download"){
			table_download(data);
		}
	}


	function slug_it(str) {
		return str.toString().toLowerCase().trim()
		.replace(/\s+/g, '-')           /* Replace spaces with - */
		.replace(/&/g, '-and-')         /* Replace & with 'and' */
		.replace(/[^\w\-]+/g, '')       /* Remove all non-word chars */
		.replace(/\-\-+/g, '-');        /* Replace multiple - with single - */
	}


	function padLeft(date){
		
		return String(date).length > 1? date : '0'+date ;
	}

	


	function table_download() {
		
		var students=getSelectedStudents();
		var csvContent = "data:text/csv;charset=utf-8,";
		var head = ['Moodle_id', 'Prénom', 'Nom', 'Groupe', 'Complétion (en %)'];
		data.active_section_id=$("#section-select").val();
		for ( var m = 0; m < data.modules.length; m++ ) {
			if ( data.active_section_id != data.modules[m].section && data.active_section_id != 0 ) {
				continue;
			}
			head.push('"'+data.modules[m].displayname.replace(',', '')+'"');
		}


		csvContent += head.join(",");
		csvContent += "\n";
		
		/* Pour chaque étudiant */
		
		for ( var s = 0; s < data.students.length; s++ ) {
			if(students.includes(data.students[s].id)){
				var arr_cpl = [];

				/* Pour chaque activité du cours */
				var activities_nbr = 0;
				var done_activities_nbr = 0;
				

				for ( var mod = 0; mod < data.modules.length; mod++ ) {
					/* Si le module n'est pas dans la section actuellement filtrée */
					
					if ( data.active_section_id != data.modules[mod].section && data.active_section_id != 0 ) {
						continue;
					}
					var stud_progress = data.students[s].progress
					/* Si l'étudiant n'a pas de progres*/
					if ( stud_progress.length == 0 ) {
						arr_cpl.push(0);
					} else {
						// var prog = 0;
						/* Pour chaque trace d'achèvement */
						var cpl = 0;
						for (var i =0; i<stud_progress.length; i++) {
							
							/* Quand l'index de progression correspond à l'id du module */
							if ( data.modules[mod].id == stud_progress[i].idmodule ) {
								cpl = stud_progress[i].completionstate;
								if (cpl == 3) {
									cpl = 0.5;
									cpl = '"' + cpl.toLocaleString() + '"';
								}
							}
						}
						
						if (cpl == 1 || cpl == 2) {
							done_activities_nbr++;
						}
						arr_cpl.push(cpl);
					}
					activities_nbr++;
				}
				var perc = Math.round(100 * 100 * done_activities_nbr / activities_nbr) / 100;
				var groups = '"';
				active_group_id=$('#group-select').val();
				data.active_group_name=$('#group-select').find('option:selected').html()

				if ( data.active_group_name != "" && active_group_id != 0 ) {
					groups += data.active_group_name.replace('"', '');
				} else {
					groups += data.students[s].groups.replace('"', '');
				}
				groups += '"';
				var arr = [
				data.students[s].id,
				data.students[s].firstname,
				data.students[s].lastname,
				groups,
				'"'+perc.toLocaleString()+'"',
				arr_cpl
				];
				var dataString = arr.join(",");
				csvContent += dataString + "\n";
			}
		}
		
		var encodedUri = encodeURI(csvContent);

		var section_name = data.active_section_id;
		if ( section_name == 0 ) {
			section_name = "cours-complet";
		} else {
			section_name = slug_it($('#section-select').find('option:selected').html()).substring(0, 20);
		}
		var d = new Date;
		month = d.getMonth()+1;


		date = d.getFullYear() +"."+ padLeft(month) +"."+ padLeft(d.getDate()) +"-"+ padLeft(d.getHours()) +"."+ padLeft(d.getMinutes()) +"."+ padLeft(d.getSeconds());
		
		var link = document.createElement("a");
		link.setAttribute("href", encodedUri);
		link.setAttribute("download", "report-"+section_name+"-"+ date +".csv");
		document.body.appendChild(link);
		link.click();
		document.body.removeChild(link); 
	}


	//Pour chaque module non caché, on va regarder pour chaque étudiant 
	function calcPercentage(data){
		console.log(data);
		for (var i = 0; i < data.students.length; i++) {
			data.students[i].percentage=0;
			var done=0;
			var nb_modules=0;
			for(var j=0; j < data.students[i].progress.length;j++){
				if(data.modules.find(module => module.id === data.students[i].progress[j].idmodule).visible){
					nb_modules++;
					if(data.students[i].progress[j].completionstate == 1 || data.students[i].progress[j].completionstate ==2){
						done++;
					}
				}
			}
			data.students[i].percentage=Math.floor(100 * done / nb_modules);
		}
		return data;
		//reloadTable(data);
	}



   
  
});