<?php
	header('Content-Type: application/json');
	require('../inc/connect.php');
	
	function RandomID()
	{
		//Generate Session ID
		$characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
		$str = '';
		for ($i = 0; $i < 6; $i++) {
		    $str .= $characters[rand(0, strlen($characters) - 1)];
		}

		return $str;
	}
	
	$valid = false;
	
	while(!$valid)
	{
		$device = RandomID();
	
		// Check if ID already exists
		$sql = "SELECT `id` FROM device WHERE dev_id='" . $device . "'";
		
		$query = ExecQuery($mysqli, $sql);
	
		$valid = ($query->num_rows < 1);
	}
	
	// Register new ID
	$ip = $_SERVER['REMOTE_ADDR'];
	$sql = "INSERT INTO device (dev_id, ip) VALUES ('" . $device . "', '" . $ip . "')";
	
	ExecQuery($mysqli, $sql);
	
	echo '{"device":"' . $device . '"}';
?>