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<?php
class kOnlineTest{
	public  $db; 
	//private $testStatus='stop';
	private $validErrors= array();
	private $test, $answersGiven;
	public $options = array('limit'=> 10, 'timeLimit'=> 0, 'duration'=> 3600, 'user_id'=> 0, 'questions'=> array(),
			'solve_questions'=> array(), 'allowGrace'=> FALSE, 'testStatus'=> 'stop', 'test_id'=>'', 'tbl_test'=> 'tests',
			'tbl_q'=> 'questions', 'tbl_qa'=> 'questions_attempted',
			'handlers'=> array(),
			'forms'=> array(
					'attempt'=> array(
							'id'=> 'kTestAttempt', 'name'=> 'test_attempt_form', 'input'=> array(
									'id'=> 'test_attempt_input_%s_%s', 'name'=> 'test_attempt_form[%s]'				
							)
					)
			)
	);
	public function  __construct($options = array()){
		global $kdb;
		$this->db = $kdb;
		$this->options = array_merge($this->options, $options);
		$this->restoreMe();
	}
	public function __destruct(){
		//echo "in desstrc  ". $this->testStatus; die;
		//$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]);
	} 
	protected function onTestLoad(){
		
		if($this->test['is_valid']==0){
			$this->testStatus = 'expired';
			return;
		}
		$this->testStatus = 'init';
		$qs = implode(',', $this->questions);
		$this->db->update($this->tbl_test, array('dos'=> 'now()', 'attempt_questions'=> $qs, 'is_active'=> 1), array('id'=> $this->test['id']), array('debug'=> false));
		//echo "in testlload  $qs";die;
	}
	protected function onTestStart(){
		$this->testStatus = 'start';
		return $this->db->update($this->tbl_test, array('dos'=> 'now()', 'is_active'=> 3), array('id'=> $this->test['id']));
	}
	protected function onTestQuestionAttempt(){
		return $this->db->update($this->tbl_test, array('doa'=> 'now()', 'last_attempt'=> $this->test['last_attempt']), array('id'=> $this->test['id']));
	}
	protected function onTestComplete($update=true){
		$this->testStatus = 'complete';
		
		if($update){
			$marks = $this->calculateTestMarks();
			$this->totalMarks = $marks;
			$this->updateTestMarks($marks);
			
		}
		
		$this->destroy();
		return $this->db->update($this->tbl_test, array('dof'=> 'now()', 'is_active'=> 2), array('id'=> $this->test['id']));
	}
	protected function onTestExpire($update=true){
		$this->testStatus = 'expired';
		$this->db->update($this->tbl_test, array('dof'=> 'now()', 'is_active'=> 4), array('id'=> $this->test['id']));
		$this->storeMe();
		if($update){
			$marks = $this->calculateTestMarks();
			$this->updateTestMarks($marks);
			
		}
		$this->destroy();
	}
	public function calculateTestMarks($test_id=null){
		$test_id = isset($test_id) ? $test_id : $this->test['id'];
		$sql = "SELECT QA.*, sum(if(if(QA.answer=Q.answer, 1, 0 )=1, T.test_marks/T.no_of_questions, T.negative_marks)) as total
		 FROM {$this->tbl_qa} QA JOIN {$this->tbl_q} Q  ON Q.id = QA.question_id JOIN {$this->tbl_test} T ON T.id = QA.test_id
		 WHERE QA.test_id='$test_id' AND QA.status=1";
		
		$row = $this->db->get_row($sql);
		$total_marks = $row['total'];
		return $total_marks;
	}
	public function updateTestMarks($marks ){
		$grace = 0;
		if(isset($this->handlers['afterCalculateMarks']) && is_callable($this->handlers['afterCalculateMarks'])){
			$_marks = call_user_func( $this->handlers['afterCalculateMarks'], $this->test['id'], $marks );
			if(isset($_marks)){
				if(is_numeric($_marks)){
					$marks = $_marks;
				} else{
					if(is_array($_marks)){
						$grace = $_marks['grace'];
						//$marks = $_marks['marks'];
					}
				}
			}
		}
		
		$this->db->update($this->tbl_test, array('marks_obtained' => $marks, 'total_marks' => $marks + $grace, 'grace_marks'=> $grace ), array('id'=> $this->test['id'])); 
		$this->totalMarks  =$marks + $grace;
	}
	public function storeMe(){
		/*
		 * method used to save object required data on permanent storage
		*/
		$this->test['attempt_questions'] = implode(',', $this->questions);
		$sob = $this->test;
		$_SESSION['kOnlineTest'] = $sob;
		//print_r($sob);
	}
	public function destroy(){
		unset($_SESSION['kOnlineTest']);
	}
	public function restoreMe(){
		/*
		 * method used to restore object required data from permanent storage 
		*/
		//print_r($_SESSION['kOnlineTest']); die;
		//$sob = 
		if(isset($_SESSION['kOnlineTest'])){
			$sob = $_SESSION['kOnlineTest'];  //print_r($sob); 
			$this->test = $sob;
			$this->questions = explode(',', $sob['attempt_questions']);
			if(!isset($sob['is_active'])){
				
			}
			else if($sob['is_active']== 0){
				$this->testStatus = 'stop';
			}
			else if($sob['is_active']== 1){
				$this->testStatus = 'init';
			}
			else if($sob['is_active'] == 2){
				$this->testStatus = 'complete';
			}
			else if($sob['is_active'] == 3){
				$this->testStatus = 'start';
			}
			else if($sob['is_active'] == 4){
				$this->testStatus = 'expired';
			}
		}
		//$this->calculateTestMarks();
	}
	public function loadTest($test_id=null, $questions= null){
		$rs = false;
		$test_id = isset($test_id) ? $test_id : $this->test['id'];
		//$questions = isset($questions) ? $questions : $this->questions;
		
		$this->test = $this->db->get_row("SELECT *, CURDATE() as now_date, 
				if(( UNIX_TIMESTAMP(CURDATE()) - UNIX_TIMESTAMP(date))=0, 1, 0) as is_valid FROM {$this->tbl_test} WHERE id='$test_id'");
		//print_r($this->test); die;
		if(!empty($questions) && !is_array($questions)){
			$questions  = explode(',',$questions);
		}
		if(count($this->test)>0 && empty($questions)){
			if(!empty($this->handlers['questions_list'])){
				$questions = $this->handlers['questions_list']($this->test);
			}
		}
		if(count($questions)==0 || $test_id ==0){
			throw new Exception('Invaild test_id or questions passed');
		}  
		
		$this->questions =  $questions;
	 
		$this->onTestLoad();
		$this->test = $this->db->get_row("SELECT *, CURDATE() as now_date,
				if(( UNIX_TIMESTAMP(CURDATE()) - UNIX_TIMESTAMP(date))=0, 1, 0) as is_valid FROM {$this->tbl_test} WHERE id='$test_id'");
		$rs = true;
		$this->storeMe();
		 
		//print_r($this->questions); die;
		return $rs;	
	}
	public function getQuestions($qids = null){
		// get questions from question table //
		$qs = array();
		if(!isset($qids)){
			$qids = $this->questions;
		}
		$strids = $qids;
		if(is_array($qids)){
			$strids = implode(',', $qids);
		}
		if(!empty($strids)){
			$sql = "SELECT * FROM questions WHERE id IN($strids)";
			$qs = $this->db->query($sql);
		}
		return $qs;  
	}
	public function getAttemptQuestionIds(){
		// get questions from question table //
		$lat = $this->test['last_attempt'];
		$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 getAttemptQuestions($render=TRUE){
		if($this->test['last_attempt']==-1){
			$this->onTestStart();
		}
		$qs = $this->getAttemptQuestionIds();
		$this->solve_questions =$this->getQuestions($qs);
		if($render){
			return $this->renderQuestions();
		} else{
			return $this->solve_questions;
		}
	}
	public function getAttemptedQuestions($test_id=null, $qids=null){
		if($test_id==null){
			$test_id=$this->test['id'];
		}
		$sql = "SELECT * FROM {$this->tbl_qa} 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 getAnswers(){
		
	}
	public function renderQuestions(){
		$op = $this->options;
		$frm = $op['forms']['attempt'];
		$inp = $frm['input'];
		$inp_id = '';
		$tsv = !(empty($_POST['timespan'])) ? $_POST['timespan'] : $this->test['duration']*60*1000;
		//$tsv = 30*1000;
		$htm = "<form method=\"post\" id=\"$frm[id]\" name=\"$frm[name]\">
		<input type=\"hidden\" value=\"$tsv\" id=\"timespan\" name=\"timespan\" />
		<input type=\"hidden\" value=\"{$this->test['id']}\" name=\"$frm[name]_id\" />
		";
		//print_r($this->test);
		$qinx = $this->test['last_attempt'];
		$ixn = $qinx+2;
		foreach ($this->solve_questions as $q){
			$htm.= $this->renderQuestion($q, null, null, $ixn);
			$ixn++;
		}
			
		$htm.= '<input type="submit" class="submit" value="Send" name="send_test" />
		     </form>';
		return $htm;
		
	}
	private function checkPostAnswer($qid, $op){
		$res="";
		
		if( is_array($this->answersGiven) && isset($this->answersGiven[$qid]) && $this->answersGiven[$qid]==$op ){
			$res = 'checked="checked"';
		}
		//echo "<br/>$qid  $res   ";
		//print_r($this->answersGiven);
		return $res;
		
	}
	protected function renderQuestion($q, $name=null, $id=null, $question_no=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']);
		$h = "\n<div class=\"container\">
		<div class=\"question\">".(isset($question_no) ? "<span class=\"qno\">{$question_no}.&nbsp;</span>" : "")."<strong>".htmlspecialchars($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=\"$name\" value=\"1\" ".$this->checkPostAnswer($q['id'], 1)."><label for=\"$id\">". htmlspecialchars($q['option1']). "</label></li>";
		}
		if(!empty($q['option2'])){
			$id = sprintf($_id, $q['id'], '2');// $h.="->$id, ";
		$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"2\" ".$this->checkPostAnswer($q['id'], 2)."><label for=\"$id\">". htmlspecialchars($q['option2']). "</label></li>";
		}
		if(!empty($q['option3'])){
			$id = sprintf($_id, $q['id'], 3);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"3\" ".$this->checkPostAnswer($q['id'], 3)."><label for=\"$id\">". htmlspecialchars($q['option3']). "</label></li>";
			}
		if(!empty($q['option4'])){
			$id = sprintf($_id, $q['id'], 4);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"4\" ".$this->checkPostAnswer($q['id'], 4)."><label for=\"$id\">". htmlspecialchars($q['option4']). "</label></li>";
		}
		if(!empty($q['option5'])){
			$id = sprintf($_id, $q['id'], 5);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"5\" ".$this->checkPostAnswer($q['id'], 5)."><label for=\"$id\">". htmlspecialchars($q['option5']). "</label></li>";
		}
		if(!empty($q['option6'])){
			$id = sprintf($_id, $q['id'], 6);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"6\" ".$this->checkPostAnswer($q['id'], 6)."><label for=\"$id\">". htmlspecialchars($q['option6']). "</label></li>";
		}
		if(!empty($q['option7'])){
			$id = sprintf($_id, $q['id'], 7);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"7\" ".$this->checkPostAnswer($q['id'], 7)."><label for=\"$id\">". htmlspecialchars($q['option7']). "</label></li>";
		}	
		if(!empty($q['option8'])){
			$id = sprintf($_id, $q['id'], 8);
			$h.="<li><input type=\"radio\" id=\"$id\" name=\"$name\" value=\"8\" ".$this->checkPostAnswer($q['id'], 8)."><label for=\"$id\">". htmlspecialchars($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 $h;
	}
	public function attemptQuestions($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);
		$quest_ids = isset($quest_ids) ? $quest_ids : $this->getAttemptQuestionIds();
		$test_id = isset($test_id) ? $test_id : $this->test['id'];
		// 	print_r($_POST);
		//  	print_r($quest_ids); die;
		
		$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;
			
		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 ";
		}
		$this->answersGiven = $quest_answ;
		// print_r($quest_answ); die;
		if(is_string($quest_ids)){
			$quest_ids = explode(',', $quest_ids);
		}
		else if(!isset($quest_ids)){
			$exit = true;
		}
	
		$valError = false;
		$qAttempt = false;
		if($_POST['timespan']!=0){
			foreach ($quest_ids as $qid){
				if(empty($quest_answ) || empty($quest_answ[$qid])){
					$valError = true;
					$this->validErrors[$qid] = 'Please Select Your answer'; //echo "inside err $qid <br>";
				}
			}
		}
		
		//print_r(array_keys($quest_answ)); echo"<br/>";
		//print_r($quest_ids); echo"<br/>";
		if($valError){ // echo "in err"; die;
			$this->attemptPost = 'error';
			
		} else if($exit){
			$this->attemptPost = 'empty';
		} else{
			$qlastAttempts = $this->getAttemptedQuestions($test_id, $quest_ids);
			$lastAttemptList = array();
			foreach($qlastAttempts as $ql){
				$lastAttemptList[] = $ql['question_id'];
			}
			//print_r( $lastAttemptList );
			echo "<br/>";
			foreach ($quest_ids as $qid){
				if(in_array($qid, $lastAttemptList)){
					continue;
				}
				$qid=trim($qid);
				
				if(!empty($quest_answ[$qid])){
					$answ = $quest_answ[$qid];
					$fields = array('test_id'=> $test_id, 'question_id'=> $qid, 'answer'=> $answ);
					$this->db->insert('questions_attempted', $fields );
				}
				$qAttempt = true;
				
			}
			$this->attemptPost = 'success';
		}
		if(!$exit && !$valError){ //echo "in finish"; die;
			if($qAttempt){
				$this->test['last_attempt']  = (int)$this->limit + (int)$this->test['last_attempt'];
			}
			//echo " prev value  ".$this->test['last_attempt'];
			$this->onTestQuestionAttempt();
			$this->storeMe();
			if($_POST['timespan']==0 || $this->test['last_attempt']>=$this->test['no_of_questions']-1){
				$this->test['last_attempt'] = $this->test['no_of_questions'];
				$this->onTestComplete();
				$this->testStatus = 'complete';
			}
			//echo " now value  ".$_SESSION['kOnlineTest']['last_attempt']; die;
		}
		
		return $this->attemptPost;
	}
	public function renderAnswers(){
		
	} 
	public function getStatus(){
		return $this->testStatus;
	}
}