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// 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/>.

//
// SCORM 1.2 API Implementation
//
function SCORMapi1_2(def, cmiobj, cmiint, cmistring256, cmistring4096, scormdebugging, scormauto, scormid, cfgwwwroot, sesskey,
        scoid, attempt, viewmode, cmid, currentorg, autocommit, masteryoverride, hidetoc) {

var prerequrl = cfgwwwroot + "/mod/scorm/prereqs.php?a=" + scormid + "&scoid=" + scoid + "&attempt=" + attempt + "&mode=" + viewmode + "&currentorg=" + currentorg + "&sesskey=" + sesskey;
    var datamodelurl = cfgwwwroot + "/mod/scorm/datamodel.php";
    var datamodelurlparams = "id=" + cmid + "&a=" + scormid + "&sesskey=" + sesskey + "&attempt=" + attempt + "&scoid=" + scoid;

// Standard Data Type Definition
    CMIString256 = cmistring256;
    CMIString4096 = cmistring4096;
    CMITime = '^([0-2]{1}[0-9]{1}):([0-5]{1}[0-9]{1}):([0-5]{1}[0-9]{1})(\.[0-9]{1,2})?$';
    CMITimespan = '^([0-9]{2,4}):([0-9]{2}):([0-9]{2})(\.[0-9]{1,2})?$';
    CMIInteger = '^\\d+$';
    CMISInteger = '^-?([0-9]+)$';
    CMIDecimal = '^-?([0-9]{0,3})(\.[0-9]*)?$';
    CMIIdentifier = '^[\\u0021-\\u007E]{0,255}$';
    CMIFeedback = CMIString256; // This must be redefined
    CMIIndex = '[._](\\d+).';
    // Vocabulary Data Type Definition
    CMIStatus = '^passed$|^completed$|^failed$|^incomplete$|^browsed$';
    CMIStatus2 = '^passed$|^completed$|^failed$|^incomplete$|^browsed$|^not attempted$';
    CMIExit = '^time-out$|^suspend$|^logout$|^$';
    CMIType = '^true-false$|^choice$|^fill-in$|^matching$|^performance$|^sequencing$|^likert$|^numeric$';
    CMIResult = '^correct$|^wrong$|^unanticipated$|^neutral$|^([0-9]{0,3})?(\.[0-9]*)?$';
    NAVEvent = '^previous$|^continue$';
    // Children lists
    cmi_children = 'core,suspend_data,launch_data,comments,objectives,student_data,student_preference,interactions';
    core_children = 'student_id,student_name,lesson_location,credit,lesson_status,entry,score,total_time,lesson_mode,exit,session_time';
    score_children = 'raw,min,max';
    comments_children = 'content,location,time';
    objectives_children = 'id,score,status';
    correct_responses_children = 'pattern';
    student_data_children = 'mastery_score,max_time_allowed,time_limit_action';
    student_preference_children = 'audio,language,speed,text';
    interactions_children = 'id,objectives,time,type,correct_responses,weighting,student_response,result,latency';
    // Data ranges
    score_range = '0#100';
    audio_range = '-1#100';
    speed_range = '-100#100';
    weighting_range = '-100#100';
    text_range = '-1#1';

// The SCORM 1.2 data model
    // Set up data model for each sco
    var datamodel = {};
    for(scoid in def){
        datamodel[scoid] = {
            'cmi._children':{'defaultvalue':cmi_children, 'mod':'r', 'writeerror':'402'},
            'cmi._version':{'defaultvalue':'3.4', 'mod':'r', 'writeerror':'402'},
            'cmi.core._children':{'defaultvalue':core_children, 'mod':'r', 'writeerror':'402'},
            'cmi.core.student_id':{'defaultvalue':def[scoid]['cmi.core.student_id'], 'mod':'r', 'writeerror':'403'},
            'cmi.core.student_name':{'defaultvalue':def[scoid]['cmi.core.student_name'], 'mod':'r', 'writeerror':'403'},
            'cmi.core.lesson_location':{'defaultvalue':def[scoid]['cmi.core.lesson_location'], 'format':CMIString256, 'mod':'rw', 'writeerror':'405'},
            'cmi.core.credit':{'defaultvalue':def[scoid]['cmi.core.credit'], 'mod':'r', 'writeerror':'403'},
            'cmi.core.lesson_status':{'defaultvalue':def[scoid]['cmi.core.lesson_status'], 'format':CMIStatus, 'mod':'rw', 'writeerror':'405'},
            'cmi.core.entry':{'defaultvalue':def[scoid]['cmi.core.entry'], 'mod':'r', 'writeerror':'403'},
            'cmi.core.score._children':{'defaultvalue':score_children, 'mod':'r', 'writeerror':'402'},
            'cmi.core.score.raw':{'defaultvalue':def[scoid]['cmi.core.score.raw'], 'format':CMIDecimal, 'range':score_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.core.score.max':{'defaultvalue':def[scoid]['cmi.core.score.max'], 'format':CMIDecimal, 'range':score_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.core.score.min':{'defaultvalue':def[scoid]['cmi.core.score.min'], 'format':CMIDecimal, 'range':score_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.core.total_time':{'defaultvalue':def[scoid]['cmi.core.total_time'], 'mod':'r', 'writeerror':'403'},
            'cmi.core.lesson_mode':{'defaultvalue':def[scoid]['cmi.core.lesson_mode'], 'mod':'r', 'writeerror':'403'},
            'cmi.core.exit':{'defaultvalue':def[scoid]['cmi.core.exit'], 'format':CMIExit, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.core.session_time':{'format':CMITimespan, 'mod':'w', 'defaultvalue':'00:00:00', 'readerror':'404', 'writeerror':'405'},
            'cmi.suspend_data':{'defaultvalue':def[scoid]['cmi.suspend_data'], 'format':CMIString4096, 'mod':'rw', 'writeerror':'405'},
            'cmi.launch_data':{'defaultvalue':def[scoid]['cmi.launch_data'], 'mod':'r', 'writeerror':'403'},
            'cmi.comments':{'defaultvalue':def[scoid]['cmi.comments'], 'format':CMIString4096, 'mod':'rw', 'writeerror':'405'},
            // deprecated evaluation attributes
            'cmi.evaluation.comments._count':{'defaultvalue':'0', 'mod':'r', 'writeerror':'402'},
            'cmi.evaluation.comments._children':{'defaultvalue':comments_children, 'mod':'r', 'writeerror':'402'},
            'cmi.evaluation.comments.n.content':{'defaultvalue':'', 'pattern':CMIIndex, 'format':CMIString256, 'mod':'rw', 'writeerror':'405'},
            'cmi.evaluation.comments.n.location':{'defaultvalue':'', 'pattern':CMIIndex, 'format':CMIString256, 'mod':'rw', 'writeerror':'405'},
            'cmi.evaluation.comments.n.time':{'defaultvalue':'', 'pattern':CMIIndex, 'format':CMITime, 'mod':'rw', 'writeerror':'405'},
            'cmi.comments_from_lms':{'mod':'r', 'writeerror':'403'},
            'cmi.objectives._children':{'defaultvalue':objectives_children, 'mod':'r', 'writeerror':'402'},
            'cmi.objectives._count':{'mod':'r', 'defaultvalue':'0', 'writeerror':'402'},
            'cmi.objectives.n.id':{'pattern':CMIIndex, 'format':CMIIdentifier, 'mod':'rw', 'writeerror':'405'},
            'cmi.objectives.n.score._children':{'pattern':CMIIndex, 'mod':'r', 'writeerror':'402'},
            'cmi.objectives.n.score.raw':{'defaultvalue':'', 'pattern':CMIIndex, 'format':CMIDecimal, 'range':score_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.objectives.n.score.min':{'defaultvalue':'', 'pattern':CMIIndex, 'format':CMIDecimal, 'range':score_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.objectives.n.score.max':{'defaultvalue':'', 'pattern':CMIIndex, 'format':CMIDecimal, 'range':score_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.objectives.n.status':{'pattern':CMIIndex, 'format':CMIStatus2, 'mod':'rw', 'writeerror':'405'},
            'cmi.student_data._children':{'defaultvalue':student_data_children, 'mod':'r', 'writeerror':'402'},
            'cmi.student_data.mastery_score':{'defaultvalue':def[scoid]['cmi.student_data.mastery_score'], 'mod':'r', 'writeerror':'403'},
            'cmi.student_data.max_time_allowed':{'defaultvalue':def[scoid]['cmi.student_data.max_time_allowed'], 'mod':'r', 'writeerror':'403'},
            'cmi.student_data.time_limit_action':{'defaultvalue':def[scoid]['cmi.student_data.time_limit_action'], 'mod':'r', 'writeerror':'403'},
            'cmi.student_preference._children':{'defaultvalue':student_preference_children, 'mod':'r', 'writeerror':'402'},
            'cmi.student_preference.audio':{'defaultvalue':def[scoid]['cmi.student_preference.audio'], 'format':CMISInteger, 'range':audio_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.student_preference.language':{'defaultvalue':def[scoid]['cmi.student_preference.language'], 'format':CMIString256, 'mod':'rw', 'writeerror':'405'},
            'cmi.student_preference.speed':{'defaultvalue':def[scoid]['cmi.student_preference.speed'], 'format':CMISInteger, 'range':speed_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.student_preference.text':{'defaultvalue':def[scoid]['cmi.student_preference.text'], 'format':CMISInteger, 'range':text_range, 'mod':'rw', 'writeerror':'405'},
            'cmi.interactions._children':{'defaultvalue':interactions_children, 'mod':'r', 'writeerror':'402'},
            'cmi.interactions._count':{'mod':'r', 'defaultvalue':'0', 'writeerror':'402'},
            'cmi.interactions.n.id':{'pattern':CMIIndex, 'format':CMIIdentifier, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.objectives._count':{'pattern':CMIIndex, 'mod':'r', 'defaultvalue':'0', 'writeerror':'402'},
            'cmi.interactions.n.objectives.n.id':{'pattern':CMIIndex, 'format':CMIIdentifier, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.time':{'pattern':CMIIndex, 'format':CMITime, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.type':{'pattern':CMIIndex, 'format':CMIType, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.correct_responses._count':{'pattern':CMIIndex, 'mod':'r', 'defaultvalue':'0', 'writeerror':'402'},
            'cmi.interactions.n.correct_responses.n.pattern':{'pattern':CMIIndex, 'format':CMIFeedback, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.weighting':{'pattern':CMIIndex, 'format':CMIDecimal, 'range':weighting_range, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.student_response':{'pattern':CMIIndex, 'format':CMIFeedback, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.result':{'pattern':CMIIndex, 'format':CMIResult, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'cmi.interactions.n.latency':{'pattern':CMIIndex, 'format':CMITimespan, 'mod':'w', 'readerror':'404', 'writeerror':'405'},
            'nav.event':{'defaultvalue':'', 'format':NAVEvent, 'mod':'w', 'readerror':'404', 'writeerror':'405'}
        };
    }

var cmi, nav;
    function initdatamodel(scoid){
        prerequrl = cfgwwwroot + "/mod/scorm/prereqs.php?a=" + scormid + "&scoid=" + scoid + "&attempt=" + attempt + "&mode=" + viewmode + "&currentorg=" + currentorg + "&sesskey=" + sesskey;
        datamodelurlparams = "id=" + cmid + "&a=" + scormid + "&sesskey=" + sesskey + "&attempt=" + attempt + "&scoid=" + scoid;

//
        // Datamodel inizialization
        //
        cmi = new Object();
            cmi.core = new Object();
            cmi.core.score = new Object();
            cmi.objectives = new Object();
            cmi.student_data = new Object();
            cmi.student_preference = new Object();
            cmi.interactions = new Object();
            // deprecated evaluation attributes
            cmi.evaluation = new Object();
            cmi.evaluation.comments = new Object();

// Navigation Object
        nav = new Object();

for (element in datamodel[scoid]) {
            if (element.match(/\.n\./) == null) {
                if (typeof datamodel[scoid][element].defaultvalue != 'undefined') {
                    eval(element + ' = datamodel["' + scoid + '"]["' + element + '"].defaultvalue;');
                } else {
                    eval(element + ' = "";');
                }
            }
        }

eval(cmiobj[scoid]);
        eval(cmiint[scoid]);

if (cmi.core.lesson_status == '') {
            cmi.core.lesson_status = 'not attempted';
        }
    }

//
    // API Methods definition
    //
    var Initialized = false;

function LMSInitialize (param) {
        scoid = (scorm_current_node && scorm_current_node.scoid) ?  scorm_current_node.scoid : scoid;
        initdatamodel(scoid);

errorCode = "0";
        if (param == "") {
            if (!Initialized) {
                Initialized = true;
                errorCode = "0";
                if (scormdebugging) {
                    LogAPICall("LMSInitialize", param, "", errorCode);
                }
                return "true";
            } else {
                errorCode = "101";
            }
        } else {
            errorCode = "201";
        }
        if (scormdebugging) {
            LogAPICall("LMSInitialize", param, "", errorCode);
        }
        return "false";
    }

function LMSGetLastError () {
        if (scormdebugging) {
            LogAPICall("LMSGetLastError", "", "", errorCode);
        }
        return errorCode;
    }

function AddTime (first, second) {
        var sFirst = first.split(":");
        var sSecond = second.split(":");
        var cFirst = sFirst[2].split(".");
        var cSecond = sSecond[2].split(".");
        var change = 0;

FirstCents = 0;  //Cents
        if (cFirst.length > 1) {
            FirstCents = parseInt(cFirst[1],10);
        }
        SecondCents = 0;
        if (cSecond.length > 1) {
            SecondCents = parseInt(cSecond[1],10);
        }
        var cents = FirstCents + SecondCents;
        change = Math.floor(cents / 100);
        cents = cents - (change * 100);
        if (Math.floor(cents) < 10) {
            cents = "0" + cents.toString();
        }

var secs = parseInt(cFirst[0],10) + parseInt(cSecond[0],10) + change;  //Seconds
        change = Math.floor(secs / 60);
        secs = secs - (change * 60);
        if (Math.floor(secs) < 10) {
            secs = "0" + secs.toString();
        }

mins = parseInt(sFirst[1],10) + parseInt(sSecond[1],10) + change;   //Minutes
        change = Math.floor(mins / 60);
        mins = mins - (change * 60);
        if (mins < 10) {
            mins = "0" + mins.toString();
        }

hours = parseInt(sFirst[0],10) + parseInt(sSecond[0],10) + change;  //Hours
        if (hours < 10) {
            hours = "0" + hours.toString();
        }

if (cents != '0') {
            return hours + ":" + mins + ":" + secs + '.' + cents;
        } else {
            return hours + ":" + mins + ":" + secs;
        }
    }

function TotalTime() {
        total_time = AddTime(cmi.core.total_time, cmi.core.session_time);
        return '&' + underscore('cmi.core.total_time') + '=' + encodeURIComponent(total_time);
    }

function CollectData(data,parent) {
        var datastring = '';
        for (property in data) {
            if (typeof data[property] == 'object') {
                datastring += CollectData(data[property],parent + '.' + property);
            } else {
                element = parent + '.' + property;
                expression = new RegExp(CMIIndex,'g');

// get the generic name for this element (e.g. convert 'cmi.interactions.1.id' to 'cmi.interactions.n.id')
                elementmodel = String(element).replace(expression,'.n.');

// ignore the session time element
                if (element != "cmi.core.session_time") {

// check if this specific element is not defined in the datamodel,
                    // but the generic element name is
                    if (typeof datamodel[scoid][element] == "undefined" && typeof datamodel[scoid][elementmodel] != "undefined") {

// add this specific element to the data model (by cloning
                        // the generic element) so we can track changes to it
                        datamodel[scoid][element] = CloneObj(datamodel[scoid][elementmodel]);
                    }

// check if the current element exists in the datamodel
                    if (typeof datamodel[scoid][element] != "undefined") {

// make sure this is not a read only element
                        if (datamodel[scoid][element].mod != 'r') {

elementstring = '&' + underscore(element) + '=' + encodeURIComponent(data[property]);

// check if the element has a default value
                            if (typeof datamodel[scoid][element].defaultvalue != "undefined") {

// check if the default value is different from the current value
                                if (datamodel[scoid][element].defaultvalue != data[property] ||
                                    typeof datamodel[scoid][element].defaultvalue != typeof data[property]) {

// append the URI fragment to the string we plan to commit
                                    datastring += elementstring;

// update the element default to reflect the current committed value
                                    datamodel[scoid][element].defaultvalue = data[property];
                                }
                            } else {
                                // append the URI fragment to the string we plan to commit
                                datastring += elementstring;
                                // no default value for the element, so set it now
                                datamodel[scoid][element].defaultvalue = data[property];
                            }
                        }
                    }
                }
            }
        }
        return datastring;
    }

function CloneObj(obj){
        if(obj == null || typeof(obj) != 'object') {
            return obj;
        }

var temp = new obj.constructor(); // changed (twice)
        for(var key in obj) {
            temp[key] = CloneObj(obj[key]);
        }

return temp;
    }

var myRequest = NewHttpReq();
        //alert('going to:' + "<?php p($CFG->wwwroot) ?>/mod/scorm/datamodel.php" + "id=<?php p($id) ?>&a=<?php p($a) ?>&sesskey=<?php echo sesskey() ?>"+datastring);
        var result = DoRequest(myRequest, datamodelurl, datamodelurlparams + datastring);

if (result === false) {
            return false;
        }

results = String(result).split('\n');
        errorCode = results[1];
        return results[0];
    }

this.LMSInitialize = LMSInitialize;
    this.LMSFinish = LMSFinish;
    this.LMSGetValue = LMSGetValue;
    this.LMSSetValue = LMSSetValue;
    this.LMSCommit = LMSCommit;
    this.LMSGetLastError = LMSGetLastError;
    this.LMSGetErrorString = LMSGetErrorString;
    this.LMSGetDiagnostic = LMSGetDiagnostic;
}

M.scorm_api = {};

M.scorm_api.init = function(Y, def, cmiobj, cmiint, cmistring256, cmistring4096, scormdebugging, scormauto, scormid, cfgwwwroot,
        sesskey, scoid, attempt, viewmode, cmid, currentorg, autocommit, masteryoverride, hidetoc) {
    window.API = new SCORMapi1_2(def, cmiobj, cmiint, cmistring256, cmistring4096, scormdebugging, scormauto, scormid, cfgwwwroot,
            sesskey, scoid, attempt, viewmode, cmid, currentorg, autocommit, masteryoverride, hidetoc);
}

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