<?php
class SweetsInAJar
{
	function __construct()
	{
		$sms = new SendSMSXML("myUsername","myPassword");
		$theData = new ExtractData("sweets",$_GET['message'],$_GET['number']);
		$logic = new MessageLogic();
		$logic->setClosenessRangeInPercent(15);
		
		if($theData->isValid()){
			$sms->send($theData->getNumber(),$logic->getMessage($theData->getData()),"GuessGame");
		}
		else
		{
			$sms->send($theData->getNumber(),$logic->getFailedMessage(),"GuessGame");
		}
	}
}

class ExtractData
{
	private $theData;
	private $theMobileNumber;
	private $keyword;
	private $valid=false;
	
	function __construct($keyword,$message,$number)
	{
		$this->keyword = $keyword;
		$this->valid = $this->getMessageInfo($message);
		$this->theMobileNumber = $number;
	}
	
	public function isValid()
	{
		return $this->valid;
	}
	
	public function getData()
	{
		return $this->theData;
	}
	
	public function getNumber()
	{
		return $this->theMobileNumber;
	}
	
	private function getMessageInfo($m)
	{
		//remove the keyword and set the result
		//remove extra spaces 
		$m=trim($m);
		$m=str_ireplace($this->keyword,"",$m); /// remove keyword
		$m=ltrim($m); // remove any spaces
		if(is_numeric($m)) {
			$this->theData = $m;
			return true; // is it data?
		}
		else return false;
	}
}

class MessageLogic
{
	
	private static $lowGuess ="Bad Luck! There are more sweets in the jar than you think, try again.";
	private static $highGuess="Bad Luck! There are less sweets in the jar than you think, try again.";
	private static $correctGuess="Well done! You have guessed the correct amount.";
	private static $closeGuess="Close Guess! you are within {value}% of the correct answer.";
	private static $badData="We couldn't understand your answer please text in the word SWEETS and your answer, for example SWEETS 300";

	private $numSweets=5678; //default
	private $closenessRange=5;  //5 percent as default 
	
	public function setNumberOfSweets($value)
	{
		$this->numSweets=$value;
	}
	
	public function setClosenessRangeInPercent($value) //in percent
	{
		$this->closenessRange=$value;
	}
	
	public function getFailedMessage()
	{
		return self::$badData;
	}
	
	public  function getMessage($value)
	{
		/// some very simple rules
		if($value==$this->numSweets) return self::$correctGuess;
		$isClose = round(((abs($this->numSweets - $value)) / $this->numSweets) * 100); // calculate how close the number is
		if($isClose < $this->closenessRange) return str_replace("{value}",$this->closenessRange,self::$closeGuess);    // if with in the closeness range return close messsage
		else{
			if($value > $this->numSweets) return self::$highGuess;
			else return self::$lowGuess;
		}
		
	}
	
}


class SendSMSXML
{
	private static $URL = "http://www.textmarketer.biz/gateway/"; 
	private static $SHORT_CODE="88802";
	private $usingShortCode=false;
 	private $my_url;
	private $error;
	private $numberOfCreditsRemaining,$creditsUsed;
	private $transactin_id;
 
	
	function __construct($username,$password)
	{
		// Use the same username and password you have for your main account
		$this->my_url = self::$URL."?username=$username&password=$password&option=xml";
	}

	
	public function send($number,$message,$originator=null)
	{
		// sends an SMS to the gateway, the message length must be between 1 and 640 characters long.
		$this->error = null;

		$query_string .="&number=".$number;
		$query_string .="&message=".urlencode($message);

		if($this->usingShortCode) $query_string.="&orig=".self::$SHORT_CODE;
		else $query_string .="&orig=".urlencode($originator);

		$fp =fopen($this->my_url.$query_string,"r");
		$response = fread($fp,1024);

		return $this->processResponse($response);
	}

	
	public function toggleSortCode() // used for sending from our short code
	{
		$this->usingShortCode==false ? $this->usingShortCode=true
                : $this->usingShortCode=false;
	}

	
	public function getError()
	{
		// returns an array of error messages
		
		$arr = each($this->error);
		return $arr['value'];
	}
	
	
	public function getCreditsRemaining()
	{
		// the total of credits you have left in your account
		return $this->numberOfCreditsRemaining;
	}
	
	public function getCreditsUsed()
	{
		// how many credits were used for the send, a message that uses more than 160 characters will use more credits. 1 CR = 160 characters
		return $this->creditsUsed;
	}
	
	//////// PRIVATE FUNCTIONS
	
	private function processResponse($r)
	{
		$xml=simplexml_load_string($r);
		if($xml['status']=="failed"){
			foreach($xml->reason as $index => $reason) $this->error[] = $reason; /// parse the errors into an array
			return false;
		}
		else{
			$this->transaction_id = $xml['id'];
			$this->numberOfCreditsRemaining = $xml->credits;
			$this->creditsUsed = $xml->credits_used;
			return true;
		}
		
	}
}
?>