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<?php
include("init.php");
include_once("classes.php");
if(isset($_GET['id'])){
	$mcrypt = new MCrypt();
	$response = array();
	$session = $mcrypt->decrypt($_GET['id']);
	$cp = $mcrypt->decrypt($_GET['cpass']);
	$nu = $mcrypt->decrypt($_GET['username']);
	$cnu = $mcrypt->decrypt($_GET['cusername']);
	/* Fetch the information */
	$con = db_connect();
	$sql = session($con,$session);
	$total = 0;
	$message = "";
	if(db_rows($con,$sql)>0){
		/* fetch userid and create session token */
		$query = mysqli_query($con,$sql);
		while($row=mysqli_fetch_array($query)){
			$userid = $row['userid'];
			$username = $row['username'];
		}
		if(empty($cp)){
			$message = "Please enter current password";
		}else if(empty($nu)){
			$message = "Please enter new username";
		}else if(!valusername($nu)){
			$message = "Please new username is not in the correct format. Should be either number or letters or mix and more than 4 characters long.";
		}else if($username==$nu){
			$message = "Please new username is the same as your old username. Please try a different username.";
		}else if(empty($cnu)){
			$message = "Please re-enter new username again in the confirm new username field.";
		}else if(!($nu==$cnu)){
			$message = "Please new username and confirm new username must be the same.";
		}else if(username_exist($con,$nu,$userid)){
			$message = "Please username has already been used by another user. Please try another username.";
		}else if(!password_correct($con,$userid,$cp)){
			$message = "Please current password is incorrect.";
		}else{
			$sql = change_username($con,$nu,$userid);
			if(mysqli_query($con,$sql)){
				$message = "Username is successfully changed";
			}else{
				$message = "Server error. Please try again later.";
			}
		}
	}else{
		$message = "You have no right to this content";
	}
	echo json_encode(array("message"=>$mcrypt->encrypt($message)));
	db_close($con);
}
?>