<?php
/*
=========================================================
EXAM-GATE ENTERPRISE
---------------------------------------------------------
File:
admin/duplicate_question.php

Version:
3.0.0

Description:
Duplicate an Existing Question

Compatible:
JSON Edition

Author:
Zamex Link Limited
=========================================================
*/
require_once "../config/core.php";
/*
=========================================================
SESSION SECURITY
=========================================================
*/

if(!isLoggedIn())
{
    header("Location:login.php");
    exit;
}

/*
=========================================================
VALIDATE REQUEST
=========================================================
*/

$examID = trim($_GET["exam"] ?? "");
$questionFileName = basename(trim($_GET["question"] ?? ""));

if($examID=="" || $questionFileName=="")
{
    die("Invalid Request.");
}

/*
=========================================================
DIRECTORIES
=========================================================
*/

$examFolder = EXAMS_PATH . "/" . $examID;

if(!is_dir($examFolder))
{
    die("Invalid Examination.");
}

$questionFolder =
$examFolder .
"/QUESTIONS-" .
$examID;

$sourceFile =
$questionFolder .
"/" .
$questionFileName;

if(!file_exists($sourceFile))
{
    die("Question Not Found.");
}

/*
=========================================================
LOAD EXAM
=========================================================
*/

$examFile =
$examFolder .
"/exam.json";

if(!file_exists($examFile))
{
    die("Exam Information Missing.");
}

$exam = read_json($examFile);

/*
=========================================================
LOAD SOURCE QUESTION
=========================================================
*/

$question = read_json($sourceFile);

if(!$question)
{
    die("Unable to Read Question.");
}

/*
=========================================================
GENERATE NEW QUESTION ID
=========================================================
*/

$nextQuestionNumber =
(int)($exam["next_question_number"] ?? 1);

$newQuestionID =
"Q" .
str_pad(
$nextQuestionNumber,
6,
"0",
STR_PAD_LEFT
);

/*
=========================================================
UPDATE EXAM COUNTER
=========================================================
*/

$exam["next_question_number"] =
$nextQuestionNumber + 1;

write_json(
$examFile,
$exam
);

/*
=========================================================
PREPARE DUPLICATE
=========================================================
*/

/* Permanent ID */

$question["question_id"] =
$newQuestionID;

/* Display Order */

$question["question_number"] =
$nextQuestionNumber;

/* Draft Status */

$question["status"] = "Draft";

/* Audit Information */

$question["created_date"] =
date("Y-m-d");

$question["created_time"] =
date("H:i:s");

$question["last_modified"] =
date("Y-m-d H:i:s");

/* Duplicate History */

$question["is_duplicate"] = true;

$question["copied_from"] =
basename(
$questionFileName,
".json"
);

/* Remove Temporary Flags */

unset($question["deleted"]);
unset($question["deleted_date"]);
unset($question["reviewed"]);
unset($question["review_date"]);
unset($question["draft_saved"]);

/*
=========================================================
SAVE DUPLICATE
=========================================================
*/

$newQuestionFile =
$questionFolder .
"/" .
$newQuestionID .
".json";

write_json(
$newQuestionFile,
$question
);

/*
=========================================================
CENTRAL LOG
=========================================================
*/

writeLog(

"Question Duplicated",

[

"exam"=>$examID,

"source"=>$questionFileName,

"new_question"=>$newQuestionID,

"operator"=>$_SESSION["username"] ?? "Administrator",

"date"=>date("Y-m-d H:i:s")

]

);

/*
=========================================================
RETURN
=========================================================
*/

header(

"Location: question_manager.php?exam=" .

urlencode($examID) .

"&status=duplicated"

);

exit;

?>