<?php


class AlchemyAPI
{
	public $_apiKey = '';

	public function loadAPIKey($filename)
	{
		$handle = fopen($filename, 'r');
		$theData = fgets($handle, 512);
		fclose($handle);
		$this->_apiKey = rtrim($theData);

		if (strlen($this->_apiKey) < 5)
		{
			throw new Exception("Error loading API key.");
		}
	}

	public function URLGetTopRankedNamedEntity($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetTopRankedNamedEntity", "url", "url", $url);
	}

	public function HTMLGetTopRankedNamedEntity($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetTopRankedNamedEntity", "html", "html", $html, $url);
	}

	public function TextGetTopRankedNamedEntity($text)
	{
		$this->CheckText($text);

		return $this->POST("TextGetTopRankedNamedEntity", "text", "text", $text);
	}

	public function URLGetRankedNamedEntities($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetRankedNamedEntities", "url", "url", $url);
	}

	public function HTMLGetRankedNamedEntities($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetRankedNamedEntities", "html", "html", $html, $url);
	}

	public function TextGetRankedNamedEntities($text)
	{
		$this->CheckText($text);

		return $this->POST("TextGetRankedNamedEntities", "text", "text", $text);
	}

	public function URLGetNamedEntities($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetNamedEntities", "url", "url", $url);
	}

	public function HTMLGetNamedEntities($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetNamedEntities", "html", "html", $html, $url);
	}

	public function TextGetNamedEntities($text)
	{
		$this->CheckText($text);

		return $this->POST("TextGetNamedEntities", "text", "text", $text);
	}

	public function URLGetKeywords($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetKeywords", "url", "url", $url);
	}

	public function HTMLGetKeywords($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetKeywords", "html", "html", $html, $url);
	}

	public function TextGetKeywords($text)
	{
		$this->CheckText($text);

		return $this->POST("TextGetKeywords", "text", "text", $text);
	}

	public function URLGetLanguage($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetLanguage", "url", "url", $url);
	}

	public function HTMLGetLanguage($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetLanguage", "html", "html", $html, $url);
	}

	public function TextGetLanguage($text)
	{
		$this->CheckText($text);

		return $this->POST("TextGetLanguage", "text", "text", $text);
	}

	public function URLGetCategory($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetCategory", "url", "url", $url);
	}

	public function HTMLGetCategory($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetCategory", "html", "html", $html, $url);
	}

	public function URLGetText($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetText", "url", "url", $url);
	}

	public function HTMLGetText($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetText", "html", "html", $html, $url);
	}

	public function URLGetRawText($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetRawText", "url", "url", $url);
	}

	public function HTMLGetRawText($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetRawText", "html", "html", $html, $url);
	}

	public function URLGetTitle($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetTitle", "url", "url", $url);
	}

	public function HTMLGetTitle($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetTitle", "html", "html", $html, $url);
	}

	public function URLGetFeedLinks($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetFeedLinks", "url", "url", $url);
	}

	public function HTMLGetFeedLinks($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetFeedLinks", "html", "html", $html, $url);
	}

	public function URLGetMicroformats($url)
	{
		$this->CheckURL($url);

		return $this->POST("URLGetMicroformatData", "url", "url", $url);
	}

	public function HTMLGetMicroformats($html, $url)
	{
		$this->CheckHTML($html, $url);

		return $this->POSTHTML("HTMLGetMicroformatData", "html", "html", $html, $url);
	}

	private function CheckHTML($html, $url)
	{
		if (strlen($this->_apiKey) < 5)
		{
			throw new Exception("Load an API key.");
		}

		if (strlen($html) < 10)
		{
			throw new Exception("Enter a HTML document to analyze.");
		}

		if (strlen($url) < 10)
		{
			throw new Exception("Enter a valid URL to analyze.");
		}
	}

	private function CheckURL($url)
	{
		if (strlen($this->_apiKey) < 5)
		{
			throw new Exception("Load an API key.");
		}

		if (strlen($url) < 10)
		{
			throw new Exception("Enter a valid URL to analyze.");
		}
	}

	private function CheckText($text)
	{
		if (strlen($this->_apiKey) < 5)
		{
			throw new Exception("Load an API key.");
		}

		if (strlen($text) < 5)
		{
			throw new Exception("Enter some text to analyze.");
		}
	}

	private function POST($callMethod, $callPrefix, $argName, $argData)
	{
		$args = array('apikey'=> $this->_apiKey,
			      $argName=> $argData,
			      'outputMode'=> 'xml',
			      'sourceText'=> 'raw'
			      );

		$data = "";
		foreach($args as $key=>$value)
		{
			$data .= ($data != "")?"&":"";
			$data .= rawurlencode($key)."=".rawurlencode($value);
		}

		$params = array('http' => array('method' => 'POST',
						'Content-type'=> 'application/x-www-form-urlencoded',
						'Content-length' =>strlen( $data ),
						'content' => $data
						));

		$endpoint = "http://api.grid.orch8.net/calls/$callPrefix/$callMethod";

		$context = stream_context_create($params);
		$fp = @fopen($endpoint, 'rb', false, $context);
		if (!($fp))
		{
			throw new Exception("Error making API call.");
		}

		$response = @stream_get_contents($fp);
		fclose($fp);
		if ($response === false)
		{
			throw new Exception("Error making API call.");
		}

		$doc = simplexml_load_string($response);

		if (!($doc))
		{
			throw new Exception("Error making API call.");
		}

		$status = $doc->xpath("/results/status");
		if ($status[0] != "OK")
		{
			$statusInfo = $doc->xpath("/results/statusInfo");
			throw new Exception("Error making API call: $statusInfo[0]");
		}

		return $response;
	}

	private function POSTHTML($callMethod, $callPrefix, $argName, $argData, $url)
	{
		$args = array('apikey'=> $this->_apiKey,
			      $argName=> $argData,
			      'url'=> $url,
			      'outputMode'=> 'xml',
			      'sourceText'=> 'raw'
			      );

		$data = "";
		foreach($args as $key=>$value)
		{
			$data .= ($data != "")?"&":"";
			$data .= rawurlencode($key)."=".rawurlencode($value);
		}

		$params = array('http' => array('method' => 'POST',
						'Content-type'=> 'application/x-www-form-urlencoded',
						'Content-length' =>strlen( $data ),
						'content' => $data
						));

		$endpoint = "http://api.grid.orch8.net/calls/$callPrefix/$callMethod";

		$context = stream_context_create($params);
		$fp = @fopen($endpoint, 'rb', false, $context);
		if (!($fp))
		{
			throw new Exception("Error making API call.");
		}

		$response = @stream_get_contents($fp);
		fclose($fp);
		if ($response === false)
		{
			throw new Exception("Error making API call.");
		}

		$doc = simplexml_load_string($response);

		if (!($doc))
		{
			throw new Exception("Error making API call.");
		}

		$status = $doc->xpath("/results/status");
		if ($status[0] != "OK")
		{
			$statusInfo = $doc->xpath("/results/statusInfo");
			throw new Exception("Error making API call: $statusInfo[0]");
		}

		return $response;
	}
}


?>