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<?php
class kOnlineTest{
	public  $db; 
	//private $testStatus='stop';
	private $validErrors= array();
	private $test;
	public $options = array('limit'=> 1, 'timeLimit'=> 0, 'duration'=> 3600, 'lastAttempt'=> -1, 'user_id'=> 0, 'questions'=> array(),
			 'solve_questions'=> array(), 'allowGrace'=> FALSE, 'testStatus'=> 'stop', 'test_id'=>'', 'forms'=> array(
					'attempt'=> array(
							'id'=> 'kTestAttempt', 'name'=> 'test_attempt_form', 'input'=> array(
									'id'=> 'test_attempt_input_%s_%s', 'name'=> 'test_attempt_form[%s]'				
							)
					)
			)
	);
	public function  __construct($options = array()){
		global $kdb;
		$this->db = $kdb;
		$this->options = array_merge($this->options, $options);
		$this->restoreMe();
	}
	public function __destruct(){
		//echo "in desstrc  ". $this->testStatus; die;
		if($this->testStatus!='stop')
			$this->storeMe();
	}
	function __get($var){
		return isset($this->options[$var]) ? $this->options[$var] : null;
	}
	function __set($var, $val){
		$this->options[$var] = $val;
		if($var=='rows'){
			$this->rowsLength = count($this->rows);
		}
	}
	function __isset($var){
		return isset($this->options[$var]);
	}
	function __unset($var){
		unset($this->options[$var]);
	}
	public function storeMe(){
		$sob['lastAttempt'] = $this->lastAttempt;
		$sob['questions'] = $this->questions;
		$sob['test_id'] = $this->test_id;
		$sob['test'] = $this->test;
		// print_r($sob);
		$_SESSION['kOnlineTest'] = $sob;
		$this->db->update('tests', array('last_attempt'=> $this->lastAttempt ), array('id'=> $this->test_id));
	}
	public function restoreMe(){ //return ;
		if(isset($_SESSION['kOnlineTest'])){
			$sob = $_SESSION['kOnlineTest'];
			$this->lastAttempt = $sob['lastAttempt'];
			$this->questions = $sob['questions'];
			$this->test_id = $sob['test_id'];
			$this->test = $sob['test'];
		} 
	}
	 
	public function startTest($test_id = null, $questions=null){
		if(!isset($test_id)){
			$test_id = $this->test_id;
		}
		if(!isset($questions)){
			$questions = $this->questions;
		}
		else if(!is_array($questions)){
			$questions = explode(',',$questions);
		}
		
		 
		$this->test_id = $test_id;		
		$this->questions = $questions;
		$this->test = $this->db->get_row("SELECT * FROM tests WHERE id = $test_id");
		$this->lastAttempt = $this->test['last_attempt'];
		print_r($this->test); die;
		$this->storeMe();
		$this->db->update('tests', array('is_active'=>1), array('id'=> $test_id));
	}
	public function stopTest(){
		unset($_SESSION['kOnlineTest']);
		$fields = array('is_Active'=>2);
		$where = array('id'=> $this->test_id);
		$this->db->update('tests', $fields, $where);
		$this->testStatus = 'stop';
	}
	public function getStatus(){
		$lat = $this->lastAttempt;
		$limit = $this->limit;
		if(empty($this->test_id )){
			$this->testStatus = 'stop';
		}
		else if($lat == -1){
			$this->testStatus = 'init';
		}
		else if( $lat + $limit + 1 >= count($this->questions)){
			$this->testStatus = 'completed';
		}
		return $this->testStatus;
	}
	public function getNowQuestions(){
		$lat = $this->lastAttempt; //echo $lat;
		$limit = $this->limit;
		$ids = array();
		for($i=$lat+1; $i<$lat+$limit+1 && $i<count($this->questions); $i++){
			$ids[] = $this->questions[$i];
		}
		return $ids;
	}
	public function getQuestions($ids=null){
		$lat = $this->lastAttempt; //echo $lat;
		$limit = $this->limit;
		
		if(!isset($ids)){ 
			$ids = $this->getNowQuestions();
		}
		//print_r($ids);
		$qs = array();
		
		$strids = $ids;
		if(is_array($ids)){
			$strids = implode(',', $ids);
		}
		if(!empty($strids)){ 
			$sql = "SELECT * FROM questions WHERE id IN($strids)"; 
			$qs = $this->db->query($sql);
		} else{
			$this->stopTest();
		}
		//print_r($qs); die;
		return $qs;
	}
	public function loadAllQuestions($load_new = FALSE){
	
	}
	public function getAttemptQuestions(){
		 ////////////////////
		$this->solve_questions = $this->getQuestions();
		if(count($this->solve_questions)==0){
			echo '<div class="test-complete">Test Complete</div>';
		}
		return $this->renderQuestions();
	}
	public function renderQuestions(){
		$op = $this->options;
		$frm = $op['forms']['attempt'];
		$inp = $frm['input'];
		$inp_id = '';
		
		$htm = "<form method=\"post\" id=\"$frm[id]\" name=\"$frm[name]\"><input type=\"hidden\" value=\"{$this->test_id}\" name=\"$frm[name]_id\" />
		";
		foreach ($this->solve_questions as $q){
			$htm.= $this->renderQuestion($q);
		}
		 
		$htm.= '<input type="submit" value="Send" name="send_test" />
		     </form>'; 
		return $htm;
	}
	protected function renderQuestion($q, $name=null, $id=null ){
		$op = $this->options;
		$frm = $op['forms']['attempt'];
		$inp = $frm['input'];
		
		$name = isset($name) ? $name : $inp['name'] ;
		$_id = isset($id) ? $id : $inp['id'] ;
		
		$name = sprintf($name, $q['id']);
		$h = "\n<div class=\"container\">
		<div class=\"question\"><strong>$q[question]</strong></div>
		<div class=\"answer\">
       	<ul>		
		";
		if(!empty($q['option1'])){// $h.="$id";
			$id = sprintf($_id, $q['id'], '1'); //$h.="->$id, ";
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"1\"><label for=\"$id\">". $q['option1']. "</label></li>";
		}
		if(!empty($q['option2'])){
			$id = sprintf($_id, $q['id'], '2');// $h.="->$id, ";
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"2\"><label for=\"$id\">". $q['option2']. "</label></li>";
		}
		if(!empty($q['option3'])){
			$id = sprintf($_id, $q['id'], 3);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"3\"><label for=\"$id\">". $q['option3']. "</label></li>";
		}
		if(!empty($q['option4'])){
			$id = sprintf($_id, $q['id'], 4);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"4\"><label for=\"$id\">". $q['option4']. "</label></li>";
		}
		if(!empty($q['option5'])){
			$id = sprintf($_id, $q['id'], 5);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"5\"><label for=\"$id\">". $q['option5']. "</label></li>";
		}
		if(!empty($q['option6'])){
			$id = sprintf($_id, $q['id'], 6);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"6\"><label for=\"$id\">". $q['option6']. "</label></li>";
		}
		if(!empty($q['option7'])){
			$id = sprintf($_id, $q['id'], 7);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"7\"><label for=\"$id\">". $q['option7']. "</label></li>";
		}
		if(!empty($q['option8'])){
			$id = sprintf($_id, $q['id'], 8);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"8\"><label for=\"$id\">". $q['option8']. "</label></li>";
		}
		$errorC = isset($this->validErrors[$q['id']]) ? "<p class=\"error-prompt\">{$this->validErrors[$q['id']]}</p>" : '';
		$h.= "</ul>$errorC</div></div>\n";
		return $h;
	}
	public function getResult(){
		
	}
	public function getAttemptedQuestions($test_id=null, $qids=null){
		if($test_id==null){
			$test_id=$this->test_id;
		}
		$sql = "SELECT * FROM questions_attempted WHERE test_id='$test_id' AND status=1 ";
		if(!empty($qids)){
			if(is_array($qids)){
				$qids = implode(',', $qids);
			}
			$sql.=  " AND question_id IN($qids)";
		}
		
		$qs = $this->db->query($sql);
		//print_r($sql);
		return $qs;
	}
	public function calAttemptedMarks($test_id=null, $qids=null){
		if($test_id==null){
			$test_id=$this->test_id;
		}
		if($qids==null){
			$qids = $this->getAttemptedQuestions($test_id);
		}
		
		$qrySelect = "SELECT QA.id, Q.question, Q.answer as correct_option, QA.answer attempt_option, if(QA.answer=Q.answer, 1, 0 ) as correct_attempt,
		if(if(QA.answer=Q.answer, 1, 0 )=1, T.test_marks/T.no_of_questions, T.negative_marks) as question_marks
		FROM questions Q JOIN questions_attempted QA ON Q.id = QA.question_id
		JOIN tests T ON T.id = QA.test_id JOIN subjects SB ON T.subject_id = SB.id AND T.id= '$tid'";
		
		if($this->allowGrace){
			
		}
		
	}
	public function attemptQuestions($test_id=null, $quest_ids= null, $quest_answ = null){
	
		if(isset($this->attemptPost)){
			return $this->attemptPost;
		}
		
		$this->solve_questions = $this->getQuestions();
		//print_r($this->solve_questions);
		$exit = false;
		$op = $this->options;
		$frm = $op['forms']['attempt'];
		$inp = $frm['input'];
		
		$name =$frm['name'] ;
		//$id = isset($id) ? $id : $inp['id'] ;
		$name = sprintf($name, $test_id);
		
		//echo $name;
		$quest_ids = isset($quest_ids) ? $quest_ids : $this->getNowQuestions();
		$test_id = isset($test_id) ? $test_id : $this->test_id;
	//	print_r($_POST);
	//	print_r($_POST[$name]); die;
			
		if(is_string($quest_answ)){
			$quest_answ = explode(',', $quest_answ);
		}
		else if(!isset($quest_answ) && isset($_POST[$name])){
			$quest_answ = $_POST[$name];
		}
		else if(empty($quest_answ)){
			$exit = true; //echo "in ";
		}
		// print_r($quest_answ); die;
		if(is_string($quest_ids)){
			$quest_ids = explode(',', $quest_ids);
		}
		else if(!isset($quest_ids)){
			$exit = true;
		}
		
		$valError = false;
		$qAttempt = false;
		foreach ($quest_ids as $qid){
			if(empty($quest_answ) || empty($quest_answ[$qid])){
				$valError = true;
				$this->validErrors[$qid] = 'Select Your answers';
			}
		}
		if($valError){ // echo "in err"; die;
			$this->attemptPost = 'error';
			return $this->attemptPost;
		} else if($exit){
			$this->attemptPost = 'empty';
			return $this->attemptPost;
		} else{
			$qlastAttempts = $this->getAttemptedQuestions($test_id, $quest_ids);
			$lastAttemptList = array();
			foreach($qlastAttempts as $ql){
				$lastAttemptList[] = $ql['question_id'];
			}
			foreach ($quest_ids as $qid){
				if(in_array($qid, $lastAttemptList)){
					continue;
				}
				$qid=trim($qid);
				$answ = $quest_answ[$qid];
				$fields = array('test_id'=> $test_id, 'question_id'=> $qid, 'answer'=> $answ);
				$this->db->insert('questions_attempted', $fields );
				$qAttempt = true;
					
			}
			$this->attemptPost = 'success';
		}
		if($qAttempt){
			
		}
		$this->lastAttempt+= $this->limit; 
		
		return $this->attemptPost;
	}
	public function getTestScriptCode(){
		$joptions = array('timeLimit'=> $this->timeLimit, 'rightAnswers'=> $this->rightAnswers, 'attemptedQuestions'=> $this->attemptedQuestions
		);
		return '<script type="text/javascript"></script>';
	}
	 
}