<?php

namespace block_timetable\task;
 
/**
 * An example of a scheduled task.
 */
class import_data extends \core\task\scheduled_task {
 
  /**
  * Return the task's name as shown in admin screens.
  *
  * @return string
  */
  public function get_name() {
     return get_string('import_data', 'block_timetable');
  }
 
  /**
   * Execute the task.
   */
  public function execute() {
     global $DB;
     $lastmtime = get_config('block_timetable', 'lastmtime');
     $filename = get_config('timetable', 'fnamelesson');
     echo $filename;
     if (!$filename) return;
     //$filename = "/srv/stundenplan/lesson.txt"; 
     echo "Lastmtime = $lastmtime\n";
     if (file_exists ( $filename )) {
	$mtime = filemtime ( $filename );
        echo "mtime = $mtime\n";
	if ($mtime<=$lastmtime) return;	
	echo "after return\n";
	try {
 	   $transaction = $DB->start_delegated_transaction();
	   echo "before delete\n";
	   $DB->delete_records_select("timetable_lesson", "id>0");
	   echo "after delete\n";
	   $handle = @fopen($filename, "r");	   
	   echo "after handle\n";
	   while (($buffer = fgets($handle, 4096)) !== false) {
//	      echo $buffer;
	      $buffer = utf8_encode(rtrim($buffer));
	      $data = explode("\t", $buffer);
//	      echo "Num elements: ".count($data)."\n";
	      if (count($data) != 10) throw new Exception('Wrong size of elements');
//	      echo "after count data \n";
//	      echo "data 0 =$data[0]\n";

	      /*
	      $dataobject = new stdClass();
	      //$dataobject = new object;
	      $dataobject->teacher = $data[0];
	      $dataobject->day     = $data[1];
	      $dataobject->period  = $data[2];
	      $dataobject->subject = $data[3];
	      $dataobject->room    = $data[4];
	      $dataobject->lessonid= $data[5];
	      $dataobject->flag    = $data[6];
	      $dataobject->class   = $data[7];
	      $dataobject->week    = $data[8];
	      $dataobject->unknown = $data[9];
	       */ 
	      $dataobject = (object)array('teacher' => $data[0], 
		      			  'day'     => $data[1],
		      			  'period'  => $data[2],
		      			  'subject' => $data[3],
		      			  'room'    => $data[4],
		      			  'lessonid'=> $data[5],
		      			  'flag'    => $data[6],
		      			  'class'   => $data[7],
		      			  'week'    => $data[8],
					  'unknown' => $data[9]);
	       
//	      echo "after dataobject\n";
	      $DB->insert_record("timetable_lesson", $dataobject);
	   }
	   $transaction->allow_commit();
	   $lastmtime = $mtime;
	   set_config('lastmtime', $lastmtime, 'block_timetable');
	} catch(Exception $e) {
	   $transaction->rollback($e);
	}

     }
   // Apply fungus cream.
   // Apply chainsaw.
   // Apply olive oil.
  }
}