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<?php

namespace WPGMZA;

/**
 * This class represents a latitude and longitude coordinate pair, provides type consistency for latitude and longitude, and some utility functions
 */
class LatLng
{
    /**
     * @const A regular expression to match a coordinate pair from a string. The latitdue and longitude will be in matches 1 and 3 respectively.
     */
    const REGEXP = '/^(\-?\d+(\.\d+)?),\s*(\-?\d+(\.\d+)?)$/';
    
    private $_lat;
    private $_lng;
    
    /**
     * Constructor
     * @param mixed $arg Can be a string matching LatLng::REGEXP, or an object/array with lat and lng set.
     * @param mixed $lng Where $arg is a number, it will be treated as a float, you should supply a number to $lng too.
     */
    public function __construct($arg=null, $lng=null)
    {
        $this->_lat = 0;
        $this->_lng = 0;
        
        if($arg === null && $lng === null)
            return;
        
        if($lng === null)
        {
            if(is_string($arg))
            {
                $str = trim($arg, '() ');
                
                if(!preg_match(LatLng::REGEXP, $str, $m))
                    throw new \Exception('Invalid LatLng string');
                
                $arg = array(
                    'lat' => $m[1],
                    'lng' => $m[3]
                );
            }
            
            if(!is_object($arg) && !is_array($arg))
                throw new \Exception('Argument must be a LatLng literal');
            
            $obj = (object)$arg;
            
            if(!property_exists($obj, 'lat') || !property_exists($obj, 'lng'))
                throw new \Exception('Argument must define lat and lng');
            
            $this->lat = $obj->lat;
            $this->lng = $obj->lng;
        }
        else
        {
            $this->lat = $arg;
            $this->lng = $lng;
        }
    }
    
    /**
     * Gets the specified property.
     */
    public function __get($name)
    {
        switch($name)
        {
            case "lat":
                return $this->_lat;
                break;
                
            case "lng":
                return $this->_lng;
                break;
                
            default:
                return $this->{$name};
                break;
        }
    }
    
    /**
     * Sets the specified property.
     * @throws \Exception The value is not numeric (int, float or a numeric string)
     */
    public function __set($name, $value)
    {
        switch($name)
        {
            case "lat":
            case "lng":
                if(!is_numeric($value))
                    throw new \Exception('Value must be numeric');
            
                $this->{"_$name"} = floatval($value);
            
                break;
            
            default:
                $this->{$name} = $value;
                break;
        }
    }
    
    /**
     * Returns this coordinate pair as a comma separated string.
     */
    public function __toString()
    {
        return "{$this->_lat}, {$this->_lng}";
    }
}