<?php

/**
 * Datafeedr Api Client Library.
 *
 * @version 0.1b.7382
 * @copyright Datafeedr 2007 ~ 2014 - All Rights Reserved
 *
 * @mainpage
 *
 * Example of use:
 *
 * @code
 *		$api = new DatafeedrApi('<access id>', '<secret key>');
 *
 *		foreach($api->getMerchants() as $merchant)
 *			print $merchant['name'];
 *
 *		$search = $api->searchRequest();
 *		$search->addFilter("name LIKE shoe");
 *		$search->addFilter("price < 100");
 *		$search->addSort("price", DatafeedrApi::SORT_ASCENDING);
 *		$search->setLimit(25);
 *
 *		$products = $search->execute();
 *
 *		foreach($products as $product)
 *			print $product['name'];
 *
 * @endcode
 *
 *
 *
 **/

if(!class_exists('DatafeedrApi', false)) {

	/**
	 * Datafeedr API core class.
	 **/
	class DatafeedrApi
	{
		protected $_accessId;
		protected $_secretKey;

		protected $_transport;
		protected $_timeout;
		protected $_url;
		protected $_returnObjects;

		protected $_status;

		const SORT_DESCENDING = -1;
		const SORT_ASCENDING  = +1;

		const DEFAULT_URL = 'http://api.datafeedr.com';
		const DEFAULT_TIMEOUT = 30;

		const VERSION = '0.1b.7382';

		/**
		 * Constructor.
		 *
		 * @param string          $accessId      Access ID.
		 * @param object          $secretKey     Secret key.
		 * @param string|callable $transport     (optional) HTTP transport function.
		 * @param int             $timeout       (optional) HTTP connection timeout, in seconds.
		 * @param bool            $returnObjects (optional) if TRUE, responses are objects, otherwise associative arrays.
		 *
		 * The optional $transport parameter tells how HTTP requests should be made.
		 * It can be either a string that describes one of built-in transports ("curl", "file" or "socket"),
		 * or a callable object that should accept an url, an array of headers and a string of post data and
		 * should return an array [int http response status, string response body].
		 *
		 **/
		public function __construct($accessId, $secretKey, $transport = 'curl', $timeout = 0, $returnObjects = FALSE) {
			$this->_accessId = $accessId;
			$this->_secretKey = $secretKey;

			$this->_errors = array(
				1 => 'DatafeedrBadRequestError',
				2 => 'DatafeedrAuthenticationError',
				3 => 'DatafeedrLimitExceededError',
				4 => 'DatafeedrQueryError',
				7 => 'DatafeedrExternalError',
				9 => 'DatafeedrServerError',
			);

			$this->_url = self::DEFAULT_URL;
			$this->_timeout = $timeout ? $timeout : self::DEFAULT_TIMEOUT;
			$this->_returnObjects = $returnObjects;

			switch($transport) {
				case 'curl':
					$this->_transport = array($this, '_transportCurl');
					break;
				case 'file':
					$this->_transport = array($this, '_transportFile');
					break;
				case 'socket':
					$this->_transport = array($this, '_transportSocket');
					break;
				default:
					if(!is_callable($transport)) {
						throw new DatafeedrError("Transport must be a function");
					}
					$this->_transport = $transport;
			}
		}

		/**
		 * Return status information.
		 *
		 * @return array
		 *
		 **/
		public function getStatus() {
			$this->apiCall('status');
			return $this->_status;
		}

		/**
		 * Return status information from the last request.
		 *
		 * If no Api request have been made, return NULL
		 *
		 * @return array|null
		 *
		 **/
		public function lastStatus() {
			return $this->_status;
		}

		/**
		 * Return the list of networks.
		 *
		 * @param  int|array $networkId    (optional) Network id or an array of network ids
		 * @param  bool      $includeEmpty (optional) If FALSE, omit networks with 0 products
		 * @param  array     $fields       (optional) list of fields to retrieve
		 * @return array
		 *
		 **/
		public function getNetworks($networkId = NULL, $includeEmpty = FALSE, $fields = NULL) {
			$request = array();
			if($networkId) {
				$request['_ids'] = $this->_intarray($networkId);
			}
			$request['skip_empty'] = intval(!$includeEmpty);
			if($fields) {
				$request['fields'] = $fields;
			}
			$response = $this->apiCall('networks', $request);
			return $this->_get($response, 'networks');
		}

		/**
		 * Return the list of merchants.
		 *
		 * @param  int|array $networkId     (optional) Network id or array of network ids
		 * @param  bool      $includeEmpty  (optional) If FALSE, omit merchants with 0 products
		 * @param  array     $fields        (optional) list of fields to retrieve
		 * @return array
		 *
		 **/
		public function getMerchants($networkId = NULL, $includeEmpty = FALSE, $fields = NULL) {
			$request = array();
			if($networkId) {
				$request['source_ids'] = $this->_intarray($networkId);
			}
			$request['skip_empty'] = intval(!$includeEmpty);
			if($fields) {
				$request['fields'] = $fields;
			}
			$response = $this->apiCall('merchants', $request);
			return $this->_get($response, 'merchants');
		}

		/**
		 * Return the list of merchants by their ids.
		 *
		 * @param  int|array $merchantId    Merchant id or array of network ids
		 * @param  bool      $includeEmpty  (optional) If FALSE, omit merchants with 0 products
		 * @param  array     $fields        (optional) list of fields to retrieve
		 * @return array
		 *
		 **/
		public function getMerchantsById($merchantId, $includeEmpty = FALSE, $fields = NULL) {
			$request = array();
			$request['_ids'] = $this->_intarray($merchantId);
			$request['skip_empty'] = intval(!$includeEmpty);
			if($fields) {
				$request['fields'] = $fields;
			}
			$response = $this->apiCall('merchants', $request);
			return $this->_get($response, 'merchants');
		}

		/**
		 * Return the list of searchable fields.
		 *
		 * @param  int|array $networkId (optional) Network id or array of network ids
		 * @return array
		 *
		 **/
		public function getFields($networkId = NULL) {
			$request = array();
			if($networkId) {
				$request['source_ids'] = $this->_intarray($networkId);
			}
			$response = $this->apiCall('fields', $request);
			return $this->_get($response, 'fields');
		}

		/**
		 * Return the list of products by their ids.
		 *
		 * @param  int|array  $productId  Product id or an array of products ids.
		 * @param  array      $fields     (optional) list of fields to retrieve.
		 * @return array
		 *
		 **/
		public function getProducts($productId, $fields = NULL) {
			$request = array();
			$request['_ids'] = $this->_intarray($productId);
			$request['string_ids'] = 1;
			if($fields) {
				$request['fields'] = $fields;
			}
			$response = $this->apiCall('get', $request);
			return $this->_get($response, 'products');
		}

		/**
		 * Return the list of Zanox merchant ids ("zmids").
		 *
		 * @param  int|array  $merchantId  Merchant id or an array of merchant ids.
		 * @param  int        $adspaceId   Zanox adspace Id.
		 * @param  string     $connectId   Zanox connection Id.
		 * @return array
		 *
		 **/
		public function getZanoxMerchantIds($merchantId, $adspaceId, $connectId) {
			$request = array();
			$request['merchant_ids'] = $this->_intarray($merchantId);
			$request['adspace_id'] = $adspaceId;
			$request['connect_id'] = $connectId;
			$response = $this->apiCall('zanox_merchant_ids', $request);
			return $this->_get($response, 'zanox_merchant_ids');
		}

		/**
		 * Create a new DatafeedrSearchRequest object.
		 *
		 * @return DatafeedrSearchRequest
		 *
		 **/
		public function searchRequest() {
			return new DatafeedrSearchRequest($this);
		}

		/**
		 * Create a new DatafeedrMerchantSearchRequest object.
		 *
		 * @return DatafeedrMerchantSearchRequest
		 *
		 **/
		public function merchantSearchRequest() {
			return new DatafeedrMerchantSearchRequest($this);
		}

		/**
		 * Create a new DatafeedrAmazonSearchRequest object.
		 *
		 * @return DatafeedrAmazonSearchRequest
		 *
		 **/
		public function amazonSearchRequest($awsAccessKeyId,  $awsSecretKey, $awsAssociateTag, $locale="US") {
			return new DatafeedrAmazonSearchRequest($this, $awsAccessKeyId,  $awsSecretKey, $awsAssociateTag, $locale);
		}

		/**
		 * Create a new DatafeedrAmazonLookupRequest object.
		 *
		 * @return DatafeedrAmazonLookupRequest
		 *
		 **/
		public function amazonLookupRequest($awsAccessKeyId,  $awsSecretKey, $awsAssociateTag, $locale="US") {
			return new DatafeedrAmazonLookupRequest($this, $awsAccessKeyId,  $awsSecretKey, $awsAssociateTag, $locale);
		}

		/**
		 * Perform the raw Api call.
		 *
		 * @param  string $action Api action.
		 * @param  array  $request (optional) Request data.
		 *
		 * @return array
		 *
		 **/
		public function apiCall($action, $request = NULL) {
			if(!$request) {
				$request = array();
			}

			$request['aid'] = $this->_accessId;
			$request['timestamp'] = gmdate('Y-m-d H:i:s');

			$message = $request['aid'] .$action . $request['timestamp'];
			$request['signature'] = hash_hmac('sha256', $message, $this->_secretKey, FALSE);

			$postdata = json_encode($request);
			$url = $this->_url . '/' . $action;
			$headers = array(
				'Content-Type: application/json',
				'Accept: application/json',
				'Content-Length: '. strlen($postdata),
				'Connection: close',
				'User-Agent: datafeedr.php.' . self::VERSION
			);
			list($status, $response) = call_user_func($this->_transport, $url, $headers, $postdata);
			if(strlen($response)) {
				$response = json_decode($response, !$this->_returnObjects);
			}

			$error = $this->_get($response, 'error');
			if($error) {
				$type = $this->_get($response, 'type');
				$cls  = isset($this->_errors[$type]) ? $this->_errors[$type] : 'DatafeedrError';
				throw new $cls($this->_get($response, 'message'), $error);
			}

			if($status != 200) {
				throw new DatafeedrHTTPError("Status $status");
			}

			$this->_status = $this->_get($response, 'status');
			return $response;
		}

		protected function _intarray($id_or_ids) {
			if(is_numeric($id_or_ids)) {
				return array($id_or_ids);
			}
			if(is_array($id_or_ids)) {
				return array_values($id_or_ids);
			}
			return array();
		}

		protected function _get($obj, $prop, $default=NULL) {
			if(is_array($obj) && isset($obj[$prop])) {
				return $obj[$prop];
			}
			if(is_object($obj) && isset($obj->$prop)) {
				return $obj->$prop;
			}
			return $default;
		}


		/**
		 * Perform a HTTP post request by the means of the curl library.
		 *
		 * @param  string  $url       Request url.
		 * @param  array   $headers   Array of headers.
		 * @param  string  $postdata  Post data.
		 * @return array              (int http status, string response body)
		 *
		 **/
		protected function _transportCurl($url, $headers, $postdata) {
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $url);
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->_timeout);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
			curl_setopt($ch, CURLOPT_POST, 1);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);

			$response = curl_exec($ch);
			$status   = intval(curl_getinfo($ch, CURLINFO_HTTP_CODE));
			$errno    = curl_errno($ch);
			$errmsg   = curl_error($ch);

			curl_close($ch);

			if($errno) {
				throw new DatafeedrHTTPError($errmsg, $errno);
			}

			return array($status, $response);
		}

		/**
		 * Perform a HTTP post request using file functions.
		 *
		 * @param  string  $url       Request url.
		 * @param  array   $headers   Array of headers.
		 * @param  string  $postdata  Post data.
		 * @return array              (int http status, string response body)
		 *
		 **/
		protected function _transportFile($url, $headers, $postdata) {
			$options = array('http' => array(
				'method'  => 'POST',
				'content' => $postdata,
				'header'  => implode("\r\n", $headers),
				'ignore_errors' => TRUE,
				'timeout' => $this->_timeout,
			));
			$context  = stream_context_create($options);
			$response = file_get_contents($url, false, $context);

			$status = 200;
			if(isset($http_response_header) && isset($http_response_header[0])) {
				if(preg_match('/HTTP.+?(\d\d\d)/', $http_response_header[0], $match)) {
					$status = intval($match[1]);
				}
			} else if($response === false) {
				throw new DatafeedrHTTPError("HTTP error: invalid response");
			}
			return array($status, $response);
		}

		/**
		 * Perform a HTTP post request using sockets.
		 *
		 * @param  string  $url       Request url.
		 * @param  array   $headers   Array of headers.
		 * @param  string  $postdata  Post data.
		 * @return array              (int http status, string response body)
		 *
		 **/
		protected function _transportSocket($url, $headers, $postdata) {
			$parts = parse_url($url);
			$errno  = 0;
			$errmsg = '';

			$fp = fsockopen($parts['host'], 80, $errno, $errmsg, $this->_timeout);
			if(!$fp) {
				throw new DatafeedrHTTPError($errmsg, $errno);
			}

			fwrite($fp, "POST " . $parts['path'] . " HTTP/1.1\r\n");
			fwrite($fp, implode("\r\n", $headers) . "\r\n\r\n");
			fwrite($fp, $postdata);

			$buf = '';
			while(!feof($fp)) {
				$buf .= fgets($fp, 1024);
			}
			fclose($fp);

			$buf = explode("\r\n\r\n", $buf, 2);
			if(count($buf) != 2) {
				throw new DatafeedrHTTPError("Invalid response");
			}
			if(preg_match('/HTTP.+?(\d\d\d)/', $buf[0], $match)) {
				$status = intval($match[1]);
			} else {
				throw new DatafeedrHTTPError("Invalid status");
			}
			return array($status, $buf[1]);
		}
	}
}

if(!class_exists('DatafeedrSearchRequestBase', false)) {
	/**
	 * Generic Datafeedr API search request.
	 **/
	class DatafeedrSearchRequestBase
	{
		protected $_api;
		protected $_lastResponse;

		/**
		 * Constructor.
		 *
		 * @param object $api DatafeedrApi object.
		 *
		 **/
		public function __construct($api) {
			$this->_api = $api;
		}

		/**
		 * Get the number of found products.
		 *
		 * @return int
		 *
		 **/
		public function getFoundCount() {
			return $this->_responseItem('found_count', 0);
		}

		/**
		 * Get the number of products that can be retrieved from the server.
		 *
		 * @return int
		 *
		 **/
		public function getResultCount() {
			return $this->_responseItem('result_count', 0);
		}

		/**
		 * Return the response from the last search.
		 *
		 * @return array
		 *
		 **/
		public function getResponse() {
			return $this->_lastResponse;
		}

		protected function _responseItem($prop, $default) {
			if(is_null($this->_lastResponse)) {
				throw new DatafeedrError("Reading from an empty request");
			}
			if(is_object($this->_lastResponse) && isset($this->_lastResponse->$prop)) {
				return $this->_lastResponse->$prop;
			}
			if(is_array($this->_lastResponse) && isset($this->_lastResponse[$prop])) {
				return $this->_lastResponse[$prop];
			}
			return $default;
		}

		function _apiCall($action, $request = NULL) {
			$this->_lastResponse = $this->_api->apiCall($action, $request);
		}

	}
}

if(!class_exists('DatafeedrSearchRequest', false)) {
	/**
	 * Search request for Datafeedr API.
	 **/
	class DatafeedrSearchRequest extends DatafeedrSearchRequestBase
	{
		/**
		 * Constructor.
		 *
		 * @param object $api DatafeedrApi object.
		 *
		 **/
		public function __construct($api) {
			parent::__construct($api);

			$this->_query       = array();
			$this->_sort        = array();
			$this->_fields      = array();
			$this->_limit       = 0;
			$this->_offset      = 0;
			$this->_priceGroups = 0;
			$this->_excludeDuplicates = "";
		}

		/**
		 * Add a query filter.
		 *
		 * @param  string $filter Query filter.
		 * @return $this
		 *
		 **/
		public function addFilter($filter) {
			$this->_query []= $filter;
			return $this;
		}

		/**
		 * Add a sort field.
		 *
		 * @param  string $field   Field name.
		 * @param  int    $order   One of DatafeedrApi::SORT_ASCENDING or DatafeedrApi::SORT_DESCENDING
		 * @return $this
		 *
		 **/
		public function addSort($field, $order = DatafeedrApi::SORT_ASCENDING) {
			if(strlen($field) && ($field[0] == '+' || $field[0] == '-')) {
				$this->_sort []= $field;
			} else if($order == DatafeedrApi::SORT_ASCENDING) {
				$this->_sort []= '+' . $field;
			} else if($order == DatafeedrApi::SORT_DESCENDING) {
				$this->_sort []= '-' . $field;
			} else {
				throw new DatafeedrError("Invalid sort order");
			}
			return $this;
		}

		/**
		 * Set which fields to retrieve.
		 *
		 * @param  array $fields List of field names.
		 * @return $this
		 *
		 **/
		public function setFields($fields) {
			$this->_fields = $fields;
			return $this;
		}

		/**
		 * Exclude duplicate results.
		 *
		 * @param  string $filter Equality filter in form "field1 field2 | field3".
		 * @return $this
		 *
		 **/
		public function excludeDuplicates($filter) {
			if(is_array($filter)) {
				$filter = implode(' ', $filter);
			}
			$this->_excludeDuplicates = $filter;
			return $this;
		}

		/**
		 * Set a limit.
		 *
		 * @param  int $limit The limit.
		 * @return $this
		 *
		 **/
		public function setLimit($limit) {
			$this->_limit = $limit;
			return $this;
		}

		/**
		 * Set an offset.
		 *
		 * @param  int $offset The offset.
		 * @return $this
		 *
		 **/
		public function setOffset($offset) {
			$this->_offset = $offset;
			return $this;
		}

		/**
		 * Set a price group count.
		 *
		 * @param  int $groups Group count.
		 * @return $this
		 *
		 **/
		public function setPriceGroups($groups) {
			$this->_priceGroups = $groups;
			return $this;
		}

		/**
		 * Get found networks.
		 *
		 * @return array
		 *
		 **/
		public function getNetworks() {
			return $this->_responseItem('networks', array());
		}

		/**
		 * Get found merchants.
		 *
		 * @return array
		 *
		 **/
		public function getMerchants() {
			return $this->_responseItem('merchants', array());
		}

		/**
		 * Get found price groups.
		 *
		 * @return array
		 *
		 **/
		public function getPriceGroups() {
			return $this->_responseItem('price_groups', array());
		}

		/**
		 * Create a request object to use with the API.
		 *
		 * @return array
		 *
		 **/
		public function getParams() {
			$request = array();
			if($this->_query) {
				$request['query'] = $this->_query;
			}
			if($this->_sort) {
				$request['sort'] = $this->_sort;
			}
			if($this->_fields) {
				$request['fields'] = $this->_fields;
			}
			if($this->_limit) {
				$request['limit'] = $this->_limit;
			}
			if($this->_offset) {
				$request['offset'] = $this->_offset;
			}
			if($this->_priceGroups) {
				$request['price_groups'] = $this->_priceGroups;
			}
			if($this->_excludeDuplicates) {
				$request['exclude_duplicates'] = $this->_excludeDuplicates;
			}
			$request['string_ids'] = 1;
			return $request;
		}

		/**
		 * Run search and return a list of products.
		 *
		 * @return array
		 *
		 **/
		public function execute() {
			$params = $this->getParams();
			if(!isset($params['query'])) {
				throw new DatafeedrError("Query can't be empty");
			}
			$this->_apiCall('search', $params);
			return $this->_responseItem('products', array());
		}

	}
}

if(!class_exists('DatafeedrMerchantSearchRequest', false)) {
	/**
	 * Search request for Datafeedr Merchants.
	 **/
	class DatafeedrMerchantSearchRequest extends DatafeedrSearchRequestBase
	{
		/**
		 * Constructor.
		 *
		 * @param object $api DatafeedrApi object.
		 *
		 **/
		public function __construct($api) {
			parent::__construct($api);

			$this->_query       = array();
			$this->_sort        = array();
			$this->_fields      = array();
			$this->_limit       = 0;
			$this->_offset      = 0;
		}

		/**
		 * Add a query filter.
		 *
		 * @param  string $filter Query filter.
		 * @return $this
		 *
		 **/
		public function addFilter($filter) {
			$this->_query []= $filter;
			return $this;
		}

		/**
		 * Add a sort field.
		 *
		 * @param  string $field   Field name.
		 * @param int $order One of DatafeedrApi::SORT_ASCENDING or DatafeedrApi::SORT_DESCENDING
		 * @throws DatafeedrError
		 * @return $this
		 *
		 **/
		public function addSort($field, $order = DatafeedrApi::SORT_ASCENDING) {
			if(strlen($field) && ($field[0] == '+' || $field[0] == '-')) {
				$this->_sort []= $field;
			} else if($order == DatafeedrApi::SORT_ASCENDING) {
				$this->_sort []= '+' . $field;
			} else if($order == DatafeedrApi::SORT_DESCENDING) {
				$this->_sort []= '-' . $field;
			} else {
				throw new DatafeedrError("Invalid sort order");
			}
			return $this;
		}

		/**
		 * Set which fields to retrieve.
		 *
		 * @param  array $fields List of field names.
		 * @return $this
		 *
		 **/
		public function setFields($fields) {
			$this->_fields = $fields;
			return $this;
		}

		/**
		 * Set a limit.
		 *
		 * @param  int $limit The limit.
		 * @return $this
		 *
		 **/
		public function setLimit($limit) {
			$this->_limit = $limit;
			return $this;
		}

		/**
		 * Set an offset.
		 *
		 * @param  int $offset The offset.
		 * @return $this
		 *
		 **/
		public function setOffset($offset) {
			$this->_offset = $offset;
			return $this;
		}

		/**
		 * Get found networks.
		 *
		 * @return array
		 *
		 **/
		public function getNetworks() {
			return $this->_responseItem('networks', array());
		}

		/**
		 * Get found merchants.
		 *
		 * @return array
		 *
		 **/
		public function getMerchants() {
			return $this->_responseItem('merchants', array());
		}

		/**
		 * Run search and return a list of merchants.
		 *
		 * @throws DatafeedrError
		 * @return array
		 *
		 **/
		public function execute() {
			$params = $this->getParams();
			if(!isset($params['query'])) {
				throw new DatafeedrError("Query can't be empty");
			}
			$this->_apiCall('merchant_search', $params);
			return $this->_responseItem('merchants', array());
		}

		/**
		 * Create a request object to use with the API.
		 *
		 * @return array
		 *
		 **/
		public function getParams() {
			$request = array();
			if($this->_query) {
				$request['query'] = $this->_query;
			}
			if($this->_sort) {
				$request['sort'] = $this->_sort;
			}
			if($this->_fields) {
				$request['fields'] = $this->_fields;
			}
			if($this->_limit) {
				$request['limit'] = $this->_limit;
			}
			if($this->_offset) {
				$request['offset'] = $this->_offset;
			}
			return $request;
		}
	}
}

if(!class_exists('DatafeedrAmazonRequest', false)) {
	/**
	 * Generic Amazon request.
	 **/
	class DatafeedrAmazonRequest extends DatafeedrSearchRequestBase
	{
		protected $_found = -1;

		const AWS_VERSION = "2011-08-01";

		/**
		 * Constructor
		 *
		 * @param object $api              DatafeedrApi object.
		 * @param string $awsAccessKeyId   Amazon access key.
		 * @param string $awsSecretKey     Amazon secret key.
		 * @param string $awsAssociateTag  Amazon associate tag.
		 * @param string $locale           Amazon locale (two-letter code).
		 */
		public function __construct($api, $awsAccessKeyId,  $awsSecretKey, $awsAssociateTag, $locale="US") {
			parent::__construct($api);
			$this->_hosts = array(
				"CA" => "webservices.amazon.ca",
				"CN" => "webservices.amazon.cn",
				"DE" => "webservices.amazon.de",
				"ES" => "webservices.amazon.es",
				"FR" => "webservices.amazon.fr",
				"IT" => "webservices.amazon.it",
				"JP" => "webservices.amazon.co.jp",
				"UK" => "webservices.amazon.co.uk",
				"US" => "webservices.amazon.com",
			);

			$this->_params = array();
			$this->_locale = strtoupper($locale);

			if(!isset($this->_hosts[$this->_locale])) {
				throw new DatafeedrError("Invalid Amazon locale");
			}

			$this->_awsAccessKeyId  =  $awsAccessKeyId;
			$this->_awsSecretKey    =  $awsSecretKey;
			$this->_awsAssociateTag =  $awsAssociateTag;
		}

		/**
		 * Returns all parameters.
		 *
		 * @return array
		 *
		 **/
		public function getParams() {
			return $this->_params;
		}

		protected function _amazonUrl($operation, $params, $defaults=NULL) {
			$params = array_filter($params);

			if(!is_null($defaults)) {
				foreach($defaults as $k => $v) {
					if(!isset($params[$k])) {
						$params[$k] = $v;
					}
				}
			}

			$params["Operation"]      = $operation;
			$params["Service"]        = "AWSECommerceService";
			$params["AWSAccessKeyId"] = $this->_awsAccessKeyId;
			$params["AssociateTag"]   = $this->_awsAssociateTag;
			$params["Version"]        = self::AWS_VERSION;
			$params["Timestamp"]      = gmdate("Y-m-d\\TH:i:s\\Z");

			ksort($params);
			$query = array();
			foreach($params as $k => $v) {
				if(is_array($v)) {
					$v = implode(',', $v);
				}
				$query []= $k . '=' . rawurlencode($v);
			}
			$query = implode('&', $query);
			$host = $this->_hosts[$this->_locale];
			$path = "/onca/xml";
			$subj = sprintf("GET\n%s\n%s\n%s", $host, $path, $query);
			$sign = rawurlencode(base64_encode(hash_hmac("sha256", $subj, $this->_awsSecretKey, TRUE)));
			return "http://{$host}{$path}?{$query}&Signature={$sign}";
		}
	}
}

if(!class_exists('DatafeedrAmazonSearchRequest', false)) {
	/**
	 * Amazon search request.
	 **/
	class DatafeedrAmazonSearchRequest extends DatafeedrAmazonRequest
	{
		/**
		 * Add a parameter.
		 *
		 * @param  string $name  Parameter name.
		 * @param  string $value Parameter value.
		 * @return $this
		 *
		 * @see http://docs.aws.amazon.com/AWSECommerceService/latest/DG/ItemSearch.html
		 *
		 **/
		public function addParam($name, $value) {
			$this->_params[$name] = $value;
			return $this;
		}

		/**
		 * Run search and return a list of products.
		 *
		 * @return array
		 *
		 **/
		public function execute() {
			$defaults = array(
				'ResponseGroup' => 'ItemAttributes,Images,OfferFull,BrowseNodes,EditorialReview,VariationSummary',
				'SearchIndex'   => 'All',
			);
			$url = $this->_amazonUrl('ItemSearch', $this->_params, $defaults);
			$this->_apiCall('amazon_search', array('url' => $url));
			return $this->_responseItem('products', array());
		}
	}
}

if(!class_exists('DatafeedrAmazonLookupRequest', false)) {
	/**
	 * Amazon lookup request.
	 **/
	class DatafeedrAmazonLookupRequest extends DatafeedrAmazonRequest
	{
		/**
		 * Add a parameter.
		 *
		 * @param  string $name        Parameter name - one of 'ASIN', 'SKU', 'UPC', 'EAN', 'ISBN'
		 * @param  string|array $value Parameter value or an array of values (up to 10).
		 * @return $this
		 *
		 * @see http://docs.aws.amazon.com/AWSECommerceService/latest/DG/ItemLookup.html
		 *
		 **/
		public function addParam($name, $value) {
			$this->_params[$name] = $value;
			return $this;
		}

		/**
		 * Run search and return a list of products.
		 *
		 * @return array
		 *
		 **/
		public function execute() {
			$params = array_filter($this->_params);
			$types = array('ASIN', 'SKU', 'UPC', 'EAN', 'ISBN', 'asin', 'sku', 'upc', 'ean', 'isbn');
			foreach($types as $type) {
				if(isset($params[$type])) {
					$params['IdType'] = strtoupper($type);
					$params['ItemId'] = $params[$type];
					unset($params[$type]);
				}
			}

			$defaults = array(
				'ResponseGroup' => 'ItemAttributes,Images,OfferFull,BrowseNodes,EditorialReview,VariationSummary',
			);
			if(isset($params['IdType']) && $params['IdType'] != 'ASIN') {
				$defaults['SearchIndex'] = 'All';
			}
			$url = $this->_amazonUrl('ItemLookup', $params, $defaults);
			$this->_apiCall('amazon_search', array('url' => $url));
			return $this->_responseItem('products', array());
		}
	}
}

if(!class_exists('DatafeedrError', false)) {
	/**
	 * Generic Api error.
	 **/
	class DatafeedrError extends Exception
	{
	}
}

if(!class_exists('DatafeedrBadRequestError', false)) {
	/**
	 * API error: Invalid Request.
	 **/
	class DatafeedrBadRequestError extends DatafeedrError
	{
	}
}

if(!class_exists('DatafeedrAuthenticationError', false)) {
	/**
	 * API error: Authentication failed.
	 **/
	class DatafeedrAuthenticationError extends DatafeedrError
	{
	}
}

if(!class_exists('DatafeedrLimitExceededError', false)) {
	/**
	 * API error: Query limit exceeded.
	 **/
	class DatafeedrLimitExceededError extends DatafeedrError
	{
	}
}

if(!class_exists('DatafeedrHTTPError', false)) {
	/**
	 * API error: Unspecified HTTP error.
	 **/
	class DatafeedrHTTPError extends DatafeedrError
	{
	}
}

if(!class_exists('DatafeedrQueryError', false)) {
	/**
	 * API error: Error in the search query.
	 **/
	class DatafeedrQueryError extends DatafeedrError
	{
	}
}

if(!class_exists('DatafeedrExternalError', false)) {
	/**
	 * API error: External service error.
	 **/
	class DatafeedrExternalError extends DatafeedrError
	{
	}
}

if(!class_exists('DatafeedrServerError', false)) {
	/**
	 * API error: Internal server error.
	 **/
	class DatafeedrServerError extends DatafeedrError
	{
	}
}

?>