<?php
include_once('../../includes/db_connect.php'); 
header("Content-Type:application/json");
$date = date("Y-m-d H:i:s");
$year = date("Y");



if(isset($_POST["nextid"])){
  extract($_POST);
  if(mysqli_num_rows(mysqli_query($con,"SELECT * FROM learningprogress WHERE lessonid='$lessonid' AND studentid='$studentid'"))<1){
      mysqli_query($con,"INSERT INTO learningprogress(unitid,lessonid,studentid) VALUES('$unitid','$lessonid','$studentid')");
    echo json_encode(array('status' => '200','message' => 'SUCCESS'));
  }
  else{
    echo json_encode(array('status' => '300','message' => 'ERROR'));
   }
  }
  
  if(isset($_POST["previousid"])){
  extract($_POST);
  if(mysqli_num_rows(mysqli_query($con,"SELECT * FROM learningprogress WHERE lessonid='$previousid' AND studentid='$studentid'"))>0){
      mysqli_query($con,"DELETE FROM learningprogress WHERE unitid='$unitid' AND lessonid='$previousid' AND studentid='$studentid'");
    echo json_encode(array('status' => '200','message' => 'SUCCESS'));
  }
  else{
    echo json_encode(array('status' => '300','message' => 'ERROR'));
   }
  }
?>
<?php mysqli_close($con) ?>