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<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Lessons extends CI_Controller {

    function __construct() {
        parent::__construct();
         if (!$this->session->userdata('user_type')) {
            $this->session->set_flashdata('flash_data', 'You don\'t have access!');
            redirect('Welcome');
        }elseif($this->session->userdata('user_type')!='employee'){
			$this->session->set_flashdata('flash_data', 'You don\'t have access!');
            redirect('Learning');
		}
        
    //convert numeric number to roman
      function numberToRomanRepresentation($number) {
            $map = array('M' => 1000, 'CM' => 900, 'D' => 500, 'CD' => 400, 'C' => 100, 'XC' => 90, 'L' => 50, 'XL' => 40, 'x' => 10, 'ix' => 9, 'v' => 5, 'iv' => 4, 'i' => 1);
            $returnValue = '';
            while ($number > 0) {
                foreach ($map as $roman => $int) {
                    if($number >= $int) {
                        $number -= $int;
                        $returnValue .= $roman;
                        break;
                    }
                }
            }
            return $returnValue;
        }
    }
       
	public function registerLesson()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/registerLesson');
		$this->load->view('includes/footer');
	}
	public function courseCategories()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/courseCategories');
		$this->load->view('includes/footer');
	}
	
	public function editCourseDetails()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/editCourseDetails');
		$this->load->view('includes/footer');
	}
	
	public function viewLesson()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewLesson');
		$this->load->view('includes/footer');
	}
	
	public function registerTopic()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/registerTopic');
		$this->load->view('includes/footer');
	}
	
	public function lessonStats()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/lessonStats');
		$this->load->view('includes/footer');
	}
	public function viewStats()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewStats');
		$this->load->view('includes/footer');
	}
	
	public function pdfRead()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/pdfRead');
		$this->load->view('includes/footer');
	}
	
	public function read_video()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/read_video');
		$this->load->view('includes/footer');
	}
	
	public function createExam()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/createExam');
		$this->load->view('includes/footer');
	}
	public function courseEnrolment()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/courseEnrolment');
		$this->load->view('includes/footer');
	}
	public function studentsEnrolled()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/studentsEnrolled');
		$this->load->view('includes/footer');
	}
	public function addExam()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/addExam');
		$this->load->view('includes/footer');
	}
	public function uploadExam()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/uploadExam');
		$this->load->view('includes/footer');
	}
	
	public function uploadLesson()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/uploadLesson');
		$this->load->view('includes/footer');
	}
	public function viewCourseDetails()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewCourseDetails');
		$this->load->view('includes/footer');
	}
	public function viewStaffs()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewStaffs');
		$this->load->view('includes/footer');
	}

	public function accountSettings()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/accountSettings');
		$this->load->view('includes/footer');
	}
	public function viewNotes()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewNotes');
		$this->load->view('includes/footer');
	}
	public function uploadExamQuestions()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/uploadExamQuestions');
		$this->load->view('includes/footer');
	}
	public function viewExams()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewExam');
		$this->load->view('includes/footer');
	}
	public function viewUsers()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewUsers');
		$this->load->view('includes/footer');
	}
	public function viewMembers()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/viewUsers');
		$this->load->view('includes/footer');
	}
	public function get_district()
	{
	   $region=$this->input->post('region');
      foreach($this->db->where('region',$region)->get('district')->result() as $row){ 
      ?>
      <option value="<?php echo $row->id;?>"><?php echo $row->name; ?></option>
      <?php
      }
                                              
	}
	public function print_certificate()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/print_certificate');
		$this->load->view('includes/footer');
	}
	public function userProfile()
	{
		$this->load->view('includes/header');
		$this->load->view('pages/userProfile');
		$this->load->view('includes/footer');
	}
	
   public function changePassword(){
	    
	     $user_id =$this->session->userdata('id');
	     $this->db->where('id',$user_id);
         $get_member=$this->db->get('users');
         foreach($get_member->result() as $row_member){
             $oldpass=$row_member->password;
         }
                
	    if($this->input->post('password')=='' | $this->input->post('oldpassword')!=$oldpass){
	       redirect('lessons/accountSettings?no');
	    }else{
	       $data_ary = array(
               'password'=>$this->input->post('password'),  
               
            );
             $data_ary = $this->security->xss_clean($data_ary);
             $this->db->where('id',$user_id);
             $this->db->update('users',$data_ary);
            redirect('lessons/accountSettings?sent');
	    }
	}
	
	
    public function addTopic()
	{
	    if($_POST){
	        $data = array(
                'name'=>$this->input->post('name'),    
                'short'=>$this->input->post('short'),    
                'time'=>$this->input->post('time'),    
                'lesson_id'=>$this->input->post('lesson_id'),    
                'date'=>date('Y-m-d H:i:s'),
                'regBy'=>$this->session->userdata('id'),
            );
            $this->db->insert('topics',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	
  public function addCourseCategory()
	{
	    $c=$this->db->where('name',$this->input->post('name'))->get('courseCategories')->num_rows();
	    if($c==0){
	        $data = array(
                'name'=>$this->input->post('name'),
                'date'=>date('Y-m-d H:i:s'),
            );
            $this->db->insert('courseCategories',$data);
           redirect('lessons/courseCategories?saved');
	    }else{
	        redirect('lessons/courseCategories?ex');
	    }
	}
	
  public function arrange_notes()
	{
	        foreach($this->db->where('id',$this->input->post('id'))->get('notes')->result() as $rowC){
	            $topic = $rowC->topic_id;
	        }
	        $c=$this->db->where('topic_id',$topic)->where('arrange',$this->input->post('arrange'))->get('notes')->num_rows();
            if($c>0){
                echo 'taken';
            }else{
	        $data = array(
                'arrange'=>$this->input->post('arrange'),    
            );
            $this->db->where('id',$this->input->post('id'))->update('notes',$data);
            }
	}
	
  public function editCourseCategory()
	{
	    if($_POST){
	        $data = array(
                'name'=>$this->input->post('name'),    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('courseCategories',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	
  public function delete_CourseCategory()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('courseCategories');
        redirect('lessons/courseCategories?del');
	}
    public function editNotes()
	{
	    if($_POST){
	        $data = array(
                'name'=>$this->input->post('name'),    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('notes',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
    public function editTopic()
	{
	    if($_POST){
	        $data = array(
                'name'=>$this->input->post('name'),
                'short'=>$this->input->post('short'),    
                'time'=>$this->input->post('time'),   
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('topics',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
  
    public function editLesson()
	{
	    if($_POST){
	        $data = array(
                'name'=>$this->input->post('name'),    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('lessons',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
    public function delete_topic()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('topics');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function delete_notes()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('notes');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function delete_exam()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('exams');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function delete_lesson()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('lessons');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function delete_staff()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('users');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function delete_user()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('students');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function deleteSection()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('exam_sections');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function deleteExamQuestionSettings()
	{
        $this->db->where('id',base64_decode($_REQUEST['id']))->delete('exam_questions');
        redirect($_SERVER['HTTP_REFERER']);
	}
    public function editCourse()
	{
	    if($_POST){
	        $data = array(
                'name'=>$this->input->post('name'),    
                'code'=>$this->input->post('code'),    
                'category'=>$this->input->post('category'),    
                'language'=>$this->input->post('language'),    
                'duration'=>$this->input->post('duration'),    
                'prerequisite'=>$this->input->post('prerequisite'),    
                'description'=>$this->input->post('description'),    
                'modules'=>$this->input->post('modules'),    
                'instructor'=>$this->input->post('instructor'),    
                'address'=>$this->input->post('address'),    
                'email'=>$this->input->post('email'),    
                'education'=>$this->input->post('education'),    
                'experience'=>$this->input->post('experience'),    
                'institution'=>$this->input->post('institution'),    
            );
           $this->db->where('id',$this->input->post('id'))->update('lessons',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
public function addLesson() {
        if (isset($_FILES["file"])) {
            //if there was an error uploading the file
            if ($_FILES["file"]["error"] > 0) {
                echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
            } else {
                $filename = basename($_FILES['file']['name']);
                $new = time() . rand();
                $ext = pathinfo($filename, PATHINFO_EXTENSION);
                $target = $new . '_' . $filename;
                $target = str_replace(" ", "_", $target);
                $storagename = "./template/img/courses/". $target;
                move_uploaded_file($_FILES["file"]["tmp_name"], $storagename);

                function formatBytes($bytes, $precision) {
                    $units = array('B', 'KB', 'MB', 'GB', 'TB');
                    $bytes = max($bytes, 0);
                    $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
                    $pow = min($pow, count($units) - 1);

                    // Uncomment one of the following alternatives
                    $bytes /= pow(1024, $pow);
                    // $bytes /= (1 << (10 * $pow)); 

                    return round($bytes, $precision) . ' ' . $units[$pow];
                }
                
                $type = explode('/',$_FILES['file']['type']);
                $type = $type[0];
                
            $data = array(
                'name'=>$this->input->post('name'),    
                'code'=>$this->input->post('code'),    
                'category'=>$this->input->post('category'),    
                'language'=>$this->input->post('language'),    
                'duration'=>$this->input->post('duration'),    
                'prerequisite'=>$this->input->post('prerequisite'),    
                'description'=>$this->input->post('description'),    
                'modules'=>$this->input->post('modules'),    
                'instructor'=>$this->input->post('instructor'),    
                'address'=>$this->input->post('address'),    
                'email'=>$this->input->post('email'),    
                'education'=>$this->input->post('education'),    
                'experience'=>$this->input->post('experience'),    
                'institution'=>$this->input->post('institution'),    
                'file'=>$target,    
                'date'=>date('Y-m-d H:i:s'),
                'regBy'=>$this->session->userdata('id'),
            );
            $this->db->insert('lessons',$data);
            $lesson_id = $this->db->insert_id();
            redirect('lessons/registerTopic?id='.base64_encode($lesson_id));
            }
        } else {
            echo 'not sent';
        }
    } 	
	 public function editCoursePhoto() {
        if (isset($_FILES["file"])) {
            //if there was an error uploading the file
            if ($_FILES["file"]["error"] > 0) {
                echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
            } else {
                $filename = basename($_FILES['file']['name']);
                $new = time() . rand();
                $ext = pathinfo($filename, PATHINFO_EXTENSION);
                $target = $new . '_' . $filename;
                $target = str_replace(" ", "_", $target);
                $storagename = "./template/img/courses/". $target;
                move_uploaded_file($_FILES["file"]["tmp_name"], $storagename);

                function formatBytes($bytes, $precision) {
                    $units = array('B', 'KB', 'MB', 'GB', 'TB');
                    $bytes = max($bytes, 0);
                    $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
                    $pow = min($pow, count($units) - 1);

                    // Uncomment one of the following alternatives
                    $bytes /= pow(1024, $pow);
                    // $bytes /= (1 << (10 * $pow)); 

                    return round($bytes, $precision) . ' ' . $units[$pow];
                }
                
                $type = explode('/',$_FILES['file']['type']);
                $type = $type[0];
                
            $data = array(
                'file'=>$target,    
            );
            $this->db->where('id',$this->input->post('id'))->update('lessons',$data);
            redirect($_SERVER['HTTP_REFERER']);
            }
        } else {
            echo 'not sent';
        }
    } 	
	
    public function addStaff()
	{
	    if($_POST){
	        $data = array(
                'full_name'=>$this->input->post('name'),    
                'username'=>$this->input->post('username'),    
                'phone'=>$this->input->post('phone'),    
                'level'=>$this->input->post('level'),    
                'date'=>date('Y-m-d H:i:s'),
                'password'=>'default',
                'regBy'=>$this->session->userdata('id'),
            );
            $this->db->insert('users',$data);
            redirect($_SERVER['HTTP_REFERER'].'?yes');
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
    public function editStaff()
	{
	    $id=base64_decode($_REQUEST['id']);
	    if($_POST){
	        $data = array(
                'full_name'=>$this->input->post('name'),    
                'username'=>$this->input->post('username'),    
                'phone'=>$this->input->post('phone'),    
                'level'=>$this->input->post('level'),    
            );
            $this->db->where('id',$id)->update('users',$data);
            redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	 public function insertExam()
	{
	    if($_POST){
	        $dur=$this->input->post('duration')/60;
	        $data = array(
                'title'=>$this->input->post('title'), 
                'other_title'=>$this->input->post('other_title'),
                'instructions'=>$this->input->post('instructions'),
                'duration'=>$dur,
                'time'=>$dur,
                'pass'=>$this->input->post('pass'),
                'lesson_id'=>$this->input->post('lesson_id'),    
                'year'=>date('Y'),
                'date'=>date('Y-m-d H:i:s'),
                'regBy'=>$this->session->userdata('id'),
            );
            $this->db->insert('exams',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	 public function addExamSection()
	{
	    if($_POST){
	        $data = array(
                'title'=>$this->input->post('title'), 
                'exam_id'=>$this->input->post('exam_id'),
                'instructions'=>$this->input->post('instructions'),    
                'no_of_questions'=>$this->input->post('no_of_questions'),    
                'totalMarks'=>$this->input->post('totalMarks'),    
                'date'=>date('Y-m-d H:i:s'),
                'regBy'=>$this->session->userdata('id'),
            );
            $this->db->insert('exam_sections',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	
   public function examQuestionSettings()
	{ 
	    if($_POST){
	        $data = array(
                'question_number'=>$this->input->post('question_number'), 
                'section_id'=>$this->input->post('section_id'),
                'isList'=>$this->input->post('isList'),    
                'no_of_list_questions'=>$this->input->post('no_of_list_questions'),    
                'type_of_list'=>$this->input->post('type_of_list'),    
                'question_type'=>$this->input->post('question_type'),    
                'date'=>date('Y-m-d H:i:s'),
                'regBy'=>$this->session->userdata('id'),
            );
            $this->db->insert('exam_questions',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
   public function editExamQuestionSettings()
	{ 
	    if($_POST){
	        $data = array(
                'question_number'=>$this->input->post('question_number'), 
                'isList'=>$this->input->post('isList'),    
                'no_of_list_questions'=>$this->input->post('no_of_list_questions'),    
                'type_of_list'=>$this->input->post('type_of_list'),    
                'question_type'=>$this->input->post('question_type'),    
            );
            $this->db->where('id',$this->input->post('id'))->update('exam_questions',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
   public function editSection()
	{ 
	    if($_POST){
	        $data = array(
                'title'=>$this->input->post('title'), 
                'instructions'=>$this->input->post('instructions'),    
                'no_of_questions'=>$this->input->post('no_of_questions'),    
                'totalMarks'=>$this->input->post('totalMarks'),    
            );
            $this->db->where('id',$this->input->post('id'))->update('exam_sections',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	public function editExam()
	{
	    if($_POST){
	         $dur=round(($this->input->post('duration')/60),8);
	        $data = array(
                'title'=>$this->input->post('title'),    
                'other_title'=>$this->input->post('other_title'), 
                'instructions'=>$this->input->post('instructions'),
                'duration'=>$dur,
                'time'=>$dur,
                'pass'=>$this->input->post('pass'),
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('exams',$data);
           redirect($_SERVER['HTTP_REFERER']);
	    }else{
	        redirect($_SERVER['HTTP_REFERER']);
	    }
	}
	public function activateExam()
	{
	        $s = $_REQUEST['s'];
	        if($s=="Off"){
	            $status="On";
	        }else{
	            $status="Off";
	        }
	        $data = array(
                'status'=>$status,    
            );
	        $dataoff = array(
                'status'=>'Off',    
            );
            //turn on and off
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('exams',$data);
            //turn off all other exams
            $this->db->where('lesson_id',base64_decode($_REQUEST['l']))->where('id!=',base64_decode($_REQUEST['id']))->update('exams',$dataoff);
            redirect($_SERVER['HTTP_REFERER']);
	    
	}
	public function enableUser()
	{
	        $status="enabled";
	         $data = array(
                'active'=>$status,    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('students',$data);
            redirect($_SERVER['HTTP_REFERER']);
	}
	public function disableUser()
	{
	        $status="disabled";
	         $data = array(
                'active'=>$status,    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('students',$data);
            redirect($_SERVER['HTTP_REFERER']);
	}
	public function activateUserProfile()
	{
	        $status="active";
	         $data = array(
                'showProfile'=>$status,    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('students',$data);
            redirect($_SERVER['HTTP_REFERER']);
	}
	public function diactivateUserProfile()
	{
	        $status="inactive";
	         $data = array(
                'showProfile'=>$status,    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('students',$data);
            redirect($_SERVER['HTTP_REFERER']);
	}
	public function enableStaff()
	{
	        $status="enabled";
	         $data = array(
                'active'=>$status,    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('users',$data);
            redirect($_SERVER['HTTP_REFERER']);
	}
	public function disableStaff()
	{
	        $status="disabled";
	         $data = array(
                'active'=>$status,    
            );
            $this->db->where('id',base64_decode($_REQUEST['id']))->update('users',$data);
            redirect($_SERVER['HTTP_REFERER']);
	}
   public function addQuestion()
	{
	    
	  //print_r($_POST); exit;
	  $data=$this->input->post('data');//parameters
	  $name=$this->input->post('name');//name of data sent
	  $text=$this->input->post('text');//data sent
	  
	  if($name=='swali'){
	  $p=explode('|',$data);
	  $qn_id=$p['0'];
	  $data = array(
        'swali'=>$text,
        );
	  $this->db->where('id',$qn_id);
      $this->db->update('exam_questions',$data);  
	  }else{
	  //expload parameters
	  $p=explode('|',$data);
	  $exam_id=$p['0'];
	  $section_id=$p['1'];
	  $question_id=$p['2'];
	  $isList=$p['3'];
	  $question_number=$p['4'];
	  
	  //check if it exist...
	  $this->db->where('exam_id',$exam_id);
	  $this->db->where('section_id',$section_id);
	  $this->db->where('question_id',$question_id);
	  $this->db->where('question_number',$question_number);
	  $c=$this->db->get('questions')->num_rows();
	  
	        $data = array(
                'exam_id'=>$exam_id,
                'section_id'=>$section_id,
                'question_id'=>$question_id,
                'isList'=>$isList,    
                'question_number'=>$question_number,    
                 $name=>$text,     
                'date'=>date('Y-m-d H:i:s'),
                'regBy'=>$this->session->userdata('id'),
            );
	        $dataUpdate = array(
              $name=>$text,     
            );
            
            if($c>0){
              $this->db->where('exam_id',$exam_id);
        	  $this->db->where('section_id',$section_id);
        	  $this->db->where('question_id',$question_id);
        	  $this->db->where('question_number',$question_number);
              $d=$this->db->update('questions',$dataUpdate);
            }else{
               $this->db->insert('questions',$data);
            }
	  }
	}
	
	
   public function sendFile() {
        if (isset($_FILES["file"])) {
            //if there was an error uploading the file
            if ($_FILES["file"]["error"] > 0) {
                echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
            } else {
               
                $filename = basename($_FILES['file']['name']);
                $new = time() . rand();
                $ext = pathinfo($filename, PATHINFO_EXTENSION);
                
                $target = $new . '_' . $filename;
                $target = str_replace(" ", "_", $target);
                $storagename = "./template/materials/". $target;
                move_uploaded_file($_FILES["file"]["tmp_name"], $storagename);

                function formatBytes($bytes, $precision) {
                    $units = array('B', 'KB', 'MB', 'GB', 'TB');
                    $bytes = max($bytes, 0);
                    $pow = floor(($bytes ? log($bytes) : 0) / log(1024));
                    $pow = min($pow, count($units) - 1);

                    // Uncomment one of the following alternatives
                    $bytes /= pow(1024, $pow);
                    // $bytes /= (1 << (10 * $pow)); 

                    return round($bytes, $precision) . ' ' . $units[$pow];
                }
                
                $type = explode('/',$_FILES['file']['type']);
                $type = $type[0];
                
                $data_ary = array(
                    'topic_id' => $this->input->post('topic_id'),
                    'lesson_id' => $this->input->post('lesson_id'),
                    'name' => $this->input->post('name'),
                    'somo' => $this->input->post('somo'),
                    'file' => $target,
                    'type' => $type,
                    'date'=>date('Y-m-d'),
                    'regBy'=>$this->session->userdata('id'),
                );
                $data_ary = $this->security->xss_clean($data_ary);
                $this->load->database();
                $this->db->insert('notes', $data_ary);
                 redirect($_SERVER['HTTP_REFERER'].$ext);
            }
        } else {
            echo 'not sent';
        }
    } 	
	

	
	
	
	
	
	
}