<?php
/**
* 
* API-call related functions
*
*/
		
class OkChangerAPI {
	protected $public_api = 'http://www.okchanger.com/en/API/';
	protected $api_id;
	protected $api_key;
	public $PaymentSystems = array();
		
	public function __construct($api_id, $api_key) {
		$this->api_id = $api_id;
		$this->api_key = $api_key;
			
		// Init payment systems
		$this->RefreshPaymentSystems();
	}
		
	/**
	* Call the API
	*/
	public function Query($method = '', $args = array()) {
		// Prepare request before send
		$this->Prepare($args);
		print_r($args);
		$url = $this->public_api.$method;
		$ch = curl_init();
		if(strtolower((substr($url,0,5))=='https')) {
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
			curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
		}
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_REFERER, $url);
		curl_setopt($ch, CURLOPT_VERBOSE, 0);
		curl_setopt($ch, CURLOPT_POST, 0);
		#curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $args);
		curl_setopt($ch, CURLOPT_USERAGENT,
			"Mozilla/4.0 (Windows; U; Windows NT 5.0; En; rv:1.8.0.2) Gecko/20070306 Firefox/1.0.0.4");
		curl_setopt($ch, CURLOPT_HEADER, 0);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_TIMEOUT, 10);
		$result = curl_exec($ch);
		curl_close($ch);
		print_r($result.PHP_EOL);
		return json_decode($result);
	}
		
	/**
	* Prepare request
	*/
	private function Prepare(&$Params) {
		// Sort array by key (ASC)
		if(isset($Params['signature'])) {
			unset($Params['signature']);
		}
			
		$Params = array_reverse($Params, true);
		$Params['APIID'] = $this->api_id;
		$Params = array_reverse($Params, true); 
			
		$SortedParams = array();
		$a1 = array_keys($Params);
		foreach($a1 as $key) {
			$SortedParams[strtolower($key)] = $Params[$key];
		}
		ksort($SortedParams);
			
		// Implode values and append API key
		$Imploded = implode(":", $SortedParams).":".$this->api_key;
			
		$SortedParams['signature'] = md5($Imploded);
		$Params = $SortedParams;
	}
		
	/**
	* Refresh payment systems collection
	*/
	public function RefreshPaymentSystems() {
		$PaySystemsResult = $this->Query("Rating_PaySystems");
		if($PaySystemsResult->IsSuccess) {
			$this->PaymentSystems = array();
			foreach($PaySystemsResult->Result as $PaySystem) {
				$this->PaymentSystems[$PaySystem->ID] = $PaySystem;
			}
		} else {
			throw new OkChangerAPIFailureException('File: '.__FILE__.' Line: '.__LINE__.' API Error: '.$PaySystemsResult->ErrorMessage);
		}
	}
		
	/**
	 * Get payment systems list
	*/
	public function Rating_PaySystems() {
		$PaySystemsResult = $this->Query("Rating_PaySystems");
		if($PaySystemsResult->IsSuccess) {
			return $PaySystemsResult->Result;
		} else {
			throw new OkChangerAPIFailureException('File: '.__FILE__.' Line: '.__LINE__.' API Error: '.$CurrencyResult->ErrorMessage);
		}
	}
		
	/**
	 * Get exchangers list
	*/
	public function Rating_Exchangers($PaySystemID) {
		if(!array_key_exists($PaySystemID, $this->PaymentSystems)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Payment system '.$PaySystemID.' not found');
		}
		$ExchangersResult = $this->Query("Rating_Exchangers", array('paySystemID' => $PaySystemID));
		if($ExchangersResult->IsSuccess) {
			return $ExchangersResult->Result;
		} else {
			throw new OkChangerAPIFailureException('File: '.__FILE__.' Line: '.__LINE__.' API Error: '.$ExchangersResult->ErrorMessage);
		}
	}
		
	/**
	 * Get available directions
	*/
	public function Rating_Exchangers_Directions($FromPaySystemID, $FromCurrencyName, $ToPaySystemID, $ToCurrencyName) {
		if(!array_key_exists($FromPaySystemID, $this->PaymentSystems)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Payment system '.$PaySystemID.' not found');
		}
		if(!array_key_exists($ToPaySystemID, $this->PaymentSystems)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Payment system '.$ToPaySystemID.' not found');
		}
			
		if(!in_array($FromCurrencyName, $this->PaymentSystems[$FromPaySystemID]->Currencies)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Currency '.$FromCurrencyName.' not found in '.$this->PaymentSystems[$FromPaySystemID]->Name.' payment system');
		}
		if(!in_array($ToCurrencyName, $this->PaymentSystems[$ToPaySystemID]->Currencies)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Currency '.$ToCurrencyName.' not found in '.$this->PaymentSystems[$FromPaySystemID]->Name.' payment system');
		}
			
		$DirectionsResult =
			$this->Query(
				"Rating_Exchangers_Directions",
				array(
					'fromPaySystemID' => $FromPaySystemID,
					'fromCurrencyName' => $FromCurrencyName,
					'toPaySystemID' => $ToPaySystemID,
					'toCurrencyName' => $ToCurrencyName
					)
			);
		if($DirectionsResult->IsSuccess) {
			return $DirectionsResult->Result;
		} else {
			throw new OkChangerAPIFailureException('File: '.__FILE__.' Line: '.__LINE__.' API Error: '.$DirectionsResult->ErrorMessage);
		}
	}
		
	/**
	 * Get available directions by payment system and currency code (FROM)
	*/
	public function Rating_Directions_From($FromPaySystemID, $FromCurrencyName) {
		if(!array_key_exists($FromPaySystemID, $this->PaymentSystems)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Payment system '.$FromPaySystemID.' not found');
		}
		if(!in_array($FromCurrencyName, $this->PaymentSystems[$FromPaySystemID]->Currencies)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Currency '.$FromCurrencyName.' not found in '.$this->PaymentSystems[$FromPaySystemID]->Name.' payment system');
		}
		$DirectionsResult =
			$this->Query(
				"Rating_Directions_From",
				array(
					'fromPaySystemID' => $FromPaySystemID,
					'fromCurrencyName' => $FromCurrencyName
					)
			);
		if($DirectionsResult->IsSuccess) {
			return $DirectionsResult->Result;
		} else {
			throw new OkChangerAPIFailureException('File: '.__FILE__.' Line: '.__LINE__.' API Error: '.$DirectionsResult->ErrorMessage);
		}
	}
		
	/**
	 * Get available directions by payment system and currency code (TO)
	*/
	public function Rating_Directions_To($ToPaySystemID, $ToCurrencyName) {
		if(!array_key_exists($ToPaySystemID, $this->PaymentSystems)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Payment system '.$ToPaySystemID.' not found');
		}
		if(!in_array($ToCurrencyName, $this->PaymentSystems[$ToPaySystemID]->Currencies)) {
			throw new OkChangerAPIInvalidParameterException('File: '.__FILE__.' Line: '.__LINE__.' Error: Currency '.$ToCurrencyName.' not found in '.$this->PaymentSystems[$FromPaySystemID]->Name.' payment system');
		}
		$DirectionsResult =
			$this->Query(
				"Rating_Directions_To",
				array(
					'toPaySystemID' => $ToPaySystemID,
					'toCurrencyName' => $ToCurrencyName
					)
			);
		if($DirectionsResult->IsSuccess) {
			return $DirectionsResult->Result;
		} else {
			throw new OkChangerAPIFailureException('File: '.__FILE__.' Line: '.__LINE__.' API Error: '.$DirectionsResult->ErrorMessage);
		}
	}
}
	
/**
 * Exceptions
*/
class OkChangerAPIException extends Exception {}
class OkChangerAPIFailureException extends OkChangerAPIException {}
class OkChangerAPIInvalidParameterException extends OkChangerAPIException {}
?>