<?php

class Airports extends Model
{

	function __construct($fromArray = array())
	{
		$this->_tableName_ = 'airports';
		parent::__construct($fromArray);
	}

	static function model()
	{
		return new self();
	}

	public static function getNearest($lat, $lng)
	{
		$degrees = 3;

		$lat = floatval($lat);
		$lng = floatval($lng);

		$delta = (1+abs(SIN($lat/100)*SIN($lat/100)*5))*$degrees;

		$query = '
			SELECT *,
			(POW(`lat`-:lat,2)+POW(`lng`-:lng,2)) AS `dist`
			FROM `airports`
			WHERE
			`lat` BETWEEN :minLat AND :maxLat
			AND
			`lng` BETWEEN :minLng AND :maxLng
			ORDER BY `dist`
			LIMIT 1;';

		$res = App::DB()->prepare($query, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
		$res->execute(array(':lat' => $lat, ':lng' => $lng, ':minLat' => $lat - $degrees, ':minLng' => $lng - $delta, ':maxLat' => $lat + $degrees, ':maxLng' => $lng + $delta));

		if ($res && $row = $res->fetch(PDO::FETCH_ASSOC)) {
			return new Airports($row);
		}

		return null;


		return self::model()->getAll(array('where'=>'`lat`>0 AND `lng`>0', 'order','limit'=>1));
	}
}