/*
	Answers LMS API adapter
	
	This code is open source under the GPL license.
	http://www.gnu.org/copyleft/gpl.html
	
	Results International 2002
*/



// ====================================================
// API Class Constructor
//
function APIClass() {
	
	// Execution State
	this.LMSInitialize = LMSInitialize;
	this.LMSFinish = LMSFinish;
	
	// Data Transfer
	this.LMSGetValue = LMSGetValue;
	this.LMSSetValue = LMSSetValue;
	this.LMSCommit = LMSCommit;
	
	// State Management
	this.LMSGetLastError = LMSGetLastError;
	this.LMSGetErrorString = LMSGetErrorString;
	this.LMSGetDiagnostic = LMSGetDiagnostic;
	
	// Private
	this.APIError = APIError;
	
}


// ====================================================
// Execution State
//
function LMSInitialize(arg) {
	if ( arg!="" ) {
		this.APIError("201");
		return "false";
	}
	this.APIError("0");
	APIInitialized = true;
	ans_function("init");
	
	if ( this.LMSGetValue("cmi.core.lesson_status") == "not_started" ) {
		this.LMSSetValue("cmi.core.lesson_status","started");
	}
	
	return "true";
}

function LMSFinish(arg) {
	if ( APIInitialized ) {
		if ( arg!="" ) {
			this.APIError("201");
			return "false";
		}
		this.APIError("0");
		this.LMSCommit("");
		setTimeout("ans_function('LMSFinish')",1000);
		return "true";
	} else {
		this.APIError("301");
		return "false";
	}
}


// ====================================================
// Data Transfer
//
function LMSGetValue(ele) {
	if ( APIInitialized ) {
		var i = array_indexOf(elements,ele);
		if ( i!=-1 ) {
			this.APIError("0");
			return values[i];
		} else {
			APIError("401");
			return "false";
		}
	} else {
		this.APIError("301");
		return "false";
	}
}

function LMSSetValue(ele,val) {
	if ( APIInitialized ) {
		var i = array_indexOf(elements,ele);
		if ( i != -1 ) {
			values[i] = val;
			this.APIError("0");
			return "true";
		} else {
			this.APIError("401");
			return "false";
		}
	} else {
		this.APIError("301");
		return "false";
	}
}

function LMSCommit(arg) {
	if ( APIInitialized ) {
		if ( arg!="" ) {
			this.APIError("201");
			return "false";
		} else {
			this.APIError("0");
			for ( var i=0; i<elements.length; i++ ) {
				//document.comms.SetVariable("elements"+i,elements[i]);
				//document.comms.SetVariable("values"+i,values[i]);
			}
			ans_function("commit");
			return "true";
		}
	} else {
		this.APIError("301");
		return "false";
	}
}


// ====================================================
// State Management
//
function LMSGetLastError() {
	if ( APIInitialized ) {
		return APILastError;
	} else {
		this.APIError("301");
		return "false";
	}
}

function LMSGetErrorString(num) {
	if ( APIInitialized ) {
		return errCodes[num];
	} else {
		this.APIError("301");
		return "false";
	}
}

function LMSGetDiagnostic(num) {
	if ( APIInitialized ) {
		if ( num=="" ) num = APILastError;
		return errDiagn[num];
	} else {
		this.APIError("301");
		return "false";
	}
}


// ====================================================
// Private
//
function APIError(num) {
	APILastError = num;
}



// ====================================================
// Error codes and Error diagnostics
//
var errCodes = new Array();
errCodes["0"]   = "No Error";
errCodes["101"] = "General Exception";
errCodes["102"] = "Server is busy";
errCodes["201"] = "Invalid Argument Error";
errCodes["202"] = "Element cannot have children";
errCodes["203"] = "Element not an array.  Cannot have count";
errCodes["301"] = "Not initialized";
errCodes["401"] = "Not implemented error";
errCodes["402"] = "Invalid set value, element is a keyword";
errCodes["403"] = "Element is read only";
errCodes["404"] = "Element is write only";
errCodes["405"] = "Incorrect Data Type";

var errDiagn = new Array();
errDiagn["0"]   = "No Error";
errDiagn["101"] = "Possible Server error.  Contact System Administrator";
errDiagn["102"] = "Server is busy and cannot handle the request.  Please try again";
errDiagn["201"] = "The course made an incorrect function call.  Contact course vendor or system administrator";
errDiagn["202"] = "The course made an incorrect data request. Contact course vendor or system administrator";
errDiagn["203"] = "The course made an incorrect data request. Contact course vendor or system administrator";
errDiagn["301"] = "The system has not been initialized correctly.  Please contact your system administrator";
errDiagn["401"] = "The course made a request for data not supported by Answers.";
errDiagn["402"] = "The course made a bad data saving request.  Contact course vendor or system adminsitrator";
errDiagn["403"] = "The course tried to write to a read only value.  Contact course vendor";
errDiagn["404"] = "The course tried to read a value that can only be written to.  Contact course vendor";
errDiagn["405"] = "The course gave an incorrect Data type.  Contact course vendor";



// ====================================================
// CMI Elements and Values
//
var elements = new Array();
elements[0]  = "cmi.core._children";
elements[1]  = "cmi.core.student_id";
elements[2]  = "cmi.core.student_name";
elements[3]  = "cmi.core.lesson_location";
elements[4]  = "cmi.core.credit";
elements[5]  = "cmi.core.lesson_status";
elements[6]  = "cmi.core.entry";
elements[7]  = "cmi.core.score._children";
elements[8]  = "cmi.core.score.raw";
elements[9]  = "cmi.core.total_time";
elements[10] = "cmi.core.exit";
elements[11] = "cmi.core.session_time";
elements[12] = "cmi.suspend_data";
elements[13] = "cmi.launch_data";
elements[14] = "cmi.comments";
elements[15] = "cmi.interactions";

var values = new Array();
values[0]  = "student_id,student_name,lesson_location,credit,lesson_status,entry,score,total_time,exit,session_time";
values[1]  = "" //<?=$userID;?>";
values[2]  = "" //<?=$row_usr["username"];?>";
values[3]  = "" //<?=$row_enr["lesson_location"];?>";
values[4]  = "" //<?=$row_crs["credit"];?>";
values[5]  = "" //<?=$row_enr["lesson_status"];?>";
values[6]  = "" //<?=$row_enr["entry"];?>";
values[7]  = "raw";
values[8]  = "" //<?=$row_enr["score"];?>";
values[9]  = "" //<?=$row_enr["total_time"];?>";
values[10] = "";
values[11] = "00:00:00";
values[12] = "" //<?=$row_enr["suspend_data"];?>";
values[13] = "" //<?=$row_crs["launch_data"];?>";
values[14] = "" //<?=$row_enr["comments"];?>";
values[15] = "" //interactions


// ====================================================
// CMI Equivalents (masks) in Database 
//  2d array with table name and field name for each cmi element
//  nun = not in db (eg: cmi.core._children)
//  enr = in enrollments table   -   only one really used at the moment
//  crs = in courses table
//  usr = in user table
//
var elemasks = new Array();
elemasks[0]  = ["nun", ""];
elemasks[1]  = ["usr", "userID"];
elemasks[2]  = ["usr", "username"];
elemasks[3]  = ["enr", "lesson_location"];
elemasks[4]  = ["crs", "credit"];
elemasks[5]  = ["enr", "lesson_status"];
elemasks[6]  = ["enr", "entry"];
elemasks[7]  = ["nun", ""];
elemasks[8]  = ["enr", "score_raw"];
elemasks[9]  = ["enr", "total_time"];
elemasks[10] = ["enr", "exit_data"];
elemasks[11] = ["enr", "session_times"];
elemasks[12] = ["enr", "suspend_data"];
elemasks[13] = ["crs", "launch_data"];
elemasks[14] = ["enr", "comments"];

var tblmasks = new Array();
tblmasks["enr"] = "enrollments";
tblmasks["usr"] = "users";
tblmasks["crs"] = "courses";




// ====================================================
// Assistant functions
//
function ans_function(func) {
	/*
		create full GET-style url with all elements and values
		and send this to the applet
		
		
	*/
	//var str = "action="+func+"&tablename=enrollments&enrollID=";
	var postvar = {action:'scorm',task:func,userid:0}
	for ( var i=0; i<elemasks.length; i++ ) {
		if ( elemasks[i][0] == "enr" ) {
			postvar["db_" + elemasks[i][1]]= escape( values[i]);
		}
	}
	
	//var response = document.comms.doSomething(str);
	//var tmp = new String(response);
	$.post('../services/',postvar,function(res){
		if(res!='')
		alert(res);
	});
}

function array_indexOf(arr,val) {
	for ( var i=0; i<arr.length; i++ ) {
		if ( arr[i] == val ) {
			return i;
		}
	}
	return -1;
}



// ====================================================
// Final Setup
//


APIInitialized = false;
APILastError = "301";
API = new APIClass();