header('Access-Control-Allow-Origin: ' . $_SERVER['HTTP_ORIGIN']);
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
header('Access-Control-Max-Age: 1000');
header('Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With');

$number=$_REQUEST['phone'];
$sessionId=$_REQUEST['sessionId'];
$text=$_REQUEST['text'];
$code=$_REQUEST['code'];
$mode="menu";
$level = 1;
$ussd_array = explode ("*",$text);
if(count($ussd_array)==0){
	$level=0;
}else{
	$level=count($ussd_array);
}
$level=$level+1;
if(trim($text)=="")
	$level=1;
	switch ($ussd_array[0]) {
		case '0':
			$mode="menu";
			break;
		case '':
			$mode="menu";
			break;
		case '1':
			$mode="create";
			break;
		case '2':
			$mode="balance";
			break;
		case '3':
			$mode="sendMoney";
			break;
		
		default:
			# code...
			break;
	}

	if($level==1){
		displayMenu();
	}else{
		if($mode=="menu"){
			switch ($text) {
				case '0':
					displayMenu();
					break;
				case '1':
					createAccount();
					break;
				case '2':
					checkBalance();
					break;
				case '3':
					checkNumber();
					break;
				case '4':
					sendMoney();
					break;
				
				default:
					displayError();
					break;
			}
		}else if($mode=="create"){
			switch ($text) {
				case '1':
					createAccount();
					break;
				case '1*1':
					echo "END You choose \n Male";
					break;
				case '1*2':
					echo "END You choose \n Female";
					break;
				case '1*3':
					echo "END You choose \n Not Now";
					break;
				
				default:
					displayError();
					break;
			}

		}else if($mode=="balance"){
			checkBalance();

		}else if($mode=="sendMoney"){
			switch ($text) {
				case '3':
					sendMoney();
					break;
				case '3*1':
					echo "END You choose \n MTN";
					break;
				case '3*2':
					echo "END You choose \n AIRTEL";
					break;
				case '3*3':
					echo "END You choose \n TIGO";
					break;
				
				default:
					displayError();
					break;
			}

		}
}
function displayMenu(){
	$text="CON USSD Testing \n";
	$text.="1. Create Account \n";
	$text.="2. Check Balance \n";
	$text.="3. Check My Number \n";
	$text.="4. Send Money \n";
	$text.="5. Buy Books \n";
	$text.="44. Next \n";
	echo $text;
}
function createAccount(){
	$text="CON Creating Account\n";
	$text.="1. Male \n";
	$text.="2. Woman \n";
	$text.="3. Not Now \n";
	echo $text;
}
function checkBalance(){
	$text="END Account Balance\n";
	$text.="Your account Balance is 43,050Rwf \n";
	echo $text;
}
function displayError(){
	$text="END Error\n";
	$text.="Uknown USSD command \n";
	echo $text;
}
function checkNumber(){
	
	$text="END Ckeck Number\n";
	$number=$_REQUEST['phone'];
	$text.="Your number is ".$number." \n";
	echo $text;
}
function sendMoney(){
	$text="CON Send Money\n";
	$text.="1. MTN \n";
	$text.="2. TIGO \n";
	$text.="3. AIRTEL \n";
	echo $text;
}