<?php
/**
 * Used to return Weather results from Googles Weather API.
 *
 * Requires (PHP Curl,PHP Tidy)
 *
 * @author Tully Rankin
 *
 */
class GoogleWeather {

/**
 * URL of API
 *
 * @param string
 */
protected $url;

/**
 * Search Query
 *
 * @param string
 */
protected $query;

/**
 * Response from API Query
 *
 * @param string
 */
protected $data;

/**
 * DOM Instance 
 *
 * @param DOMDocument
 */
protected $dom;

	/**
	 * Initializes GoogleWeather properties and
	 * queries API with search string.
	 *
	 * @param string $query Location to search
	 * @param string $url URL of the Google Weather API
	 */
	public function __construct($query, $url = 'http://www.google.com/ig/api?weather=')
	{
		$query = str_replace(' ', '+', $query);
		$this->query = $query;
		$this->url = $url;
		$this->_retrieveDATA();
		$this->dom = new DomDocument();
		$this->dom->loadXML($this->data);
		if ($this->_isResultEmpty())
			return false;
	}

	/**
	 * Queries GoogleWeather API.
	 * uses PHP Curl extention.
	 */
	protected function _retrieveDATA()
	{
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $this->url . $this->query);
		curl_setopt($ch, CURLOPT_HEADER, 0);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		$data = curl_exec($ch);
		$this->data = $this->_tidyXML($data);
	}

	/**
	 * Cleans up malformed XML Data.
	 *
	 * @param string $xml XML Formatted string
	 * @return string
	 */
	protected function _tidyXML($xml)
	{
		$options = array('input-xml' => true, 'output-xml' => true, 'clean' => true);
		$clean = tidy_parse_string($xml, $options, 'UTF8');
		tidy_clean_repair($clean);
		return $clean;
	}

	/**
	 * Checks if returned DATA has results.
	 *
	 * @return bool 
	 */
	protected function _isResultEmpty()
	{
		$error = $this->dom->getElementsByTagName('problem_cause')->item(0);
		return $error;
	}

	/**
	 * Gets the current weather condition.
	 *
	 * @return array
	 */
	public function getCurrentCondition()
	{
		$node = $this->dom->getElementsByTagName('current_conditions')->item(0);
		$current = array();
		foreach ($node->childNodes as $c) {
			$current[$c->nodeName] = $c->getAttribute('data');
		}
		return $current;
	}

	/**
	 * Get weather conditions for all days. As of now
	 * Google currently returns 4 days.
	 *
	 * @return array
	 */
	public function getAllDays()
	{
		$nodes = $this->dom->getElementsByTagName('forecast_conditions');
		$i = 1;
		$weather = array();
		foreach ($nodes as $node) {
			foreach ($node->childNodes as $c) {
				if ($c->hasAttributes())
					$weather[$i][$c->nodeName] = $c->getAttribute('data');
			}
			$i++;
		} 
		return $weather;
	}
	
}
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