<?php 
/* Yahoo! Weather API component for Cakephp
 * @author Arash Hemmat www.hemmat.biz
 * @version 1.2  some bugs has been fixed.
 * @license http://www.opensource.org/licenses/mit-license.php
 * Special thanks to "Ed Eliot" (http://www.ejeliot.com/blog/38) ,I used his code for this component.
 */

/*
 * Yahoo weather component class
 */
class yahooWeatherComponent extends Object
{
	/*
	 * @var bool
	 */
	var $controller = true;

	/*
	 * @var array
	 */
	var $errors=array();

	/*
	 * @var string
	 */
	var $content;

	/*
	 * The url of Yahoo! weather API
	 * @var string
	 */
	var $WEATHER_API_URL='http://weather.yahooapis.com/forecastrss?p=';

	/*
	 * THe address for images, you need to change this if you want to use your own images.
	 * @var string
	 */
	var $WEATHER_IMAGE_BASE='http://l.yimg.com/us.yimg.com/i/us/we/52/';
	
	/*
	 * initialization
	 * @param bool $controller
	 */
	function startup(&$controller)
	{
		$this->controller =& $controller;
	}

	/*
	 * Get the weather information for given location code
	 * @param string $locationCode a code that represent a location in Yahoo weather system
	 * @param string $degreeUnit it could be f: Fahrenheit or c: Celsius
	 * @param bool $translate this parametr indicates if the result should be translated of not
	 * @return array|bool $result
	 */
	function get_weather($locationCode,$degreeUnit='c')
	{
		if($this->content = file_get_contents($this->WEATHER_API_URL.$location_code.'&u='.$degreeUnit))
		{
			$result['location']=$this->GetTagAttributes('yweather:location');
			$result['condition']=$this->GetTagAttributes('yweather:condition');
			$result['units']=$this->GetTagAttributes('yweather:units');
			$result['wind']=$this->GetTagAttributes('yweather:wind');
			$result['atmosphere']=$this->GetTagAttributes('yweather:atmosphere');
			$result['astronomy']=$this->GetTagAttributes('yweather:astronomy');
			$result['geo:lat']=$this->GetTagValue('geo:lat');
			$result['geo:long']=$this->GetTagValue('geo:long');
			$result['link']=explode('*',$this->GetTagValue('link'));
			$result['pubDate']=$this->GetTagValue('pubDate');
			$result['description']=$this->GetTagValue('description');
			$result['image_url']=$this->WEATHER_IMAGE_BASE.$result['condition']['code'].'.gif';
			$forecasts=$this->GetTagAttributes('yweather:forecast');
			$result['tonight_forecast']=$forecasts[0];
			$result['tonight_forecast']['image_url']=$this->WEATHER_IMAGE_BASE.$result['tonight_forecast']['code'].'.gif';		
			$result['tomorrow_forecast']=$forecasts[1];
			$result['tomorrow_forecast']['image_url']=$this->WEATHER_IMAGE_BASE.$result['tomorrow_forecast']['code'].'.gif';
			return $result;
		}
		else
		{
			$this->errors[]='Unable to connect to yahoo api.';
			return false;
		}
	}

	/*
	 * @param string $sTag
	 * @return bool
	 */
	function GetTagValue($sTag)
	{
		$aMatches = array();
			
		if (preg_match("/<$sTag>([^<]*)<\/$sTag>/i", $this->content, $aMatches))
		{
			$aResult = array();
			$aResult['value'] = $aMatches[1];
			return trim($aMatches[1]);
		}
		return false;
	}

	/*
	 * @param string $sTag
	 * @return string $aResult
	 */
	function GetTagAttributes($sTag)
	{
		$aMatches = array();
			
		if (preg_match_all("/<$sTag([^\/]*)\/>/i", $this->content, $aMatches))
		{
			$aResult = array();

			for ($i = 0; $i < count($aMatches[1]); $i++)
			{
				$aSubMatches = array();

				if (preg_match_all("/([^=]+)=\"([^\"]*)\"/i", $aMatches[1][$i], $aSubMatches))
				{
					for ($j = 0; $j < count($aSubMatches[1]); $j++)
					{
						$aResult[$i][trim($aSubMatches[1][$j])] = trim($aSubMatches[2][$j]);
					}
				}
			}
			$iNumResults = count($aResult);
			if ($iNumResults > 1)
			{
				return $aResult;
			} elseif ($iNumResults == 1)
			{
				return $aResult[0];
			}
		}
		return false;
	}
}
?>