<?php

namespace api;

include_once "../../global.inc.php";
include_once PATH_DATABASE . "/SpsSqlManager.php";
include_once PATH_UTILITTY . "/XmlManager.php";
require_once PATH_API . "/Api.php";

/**
 * This class provides some spezial SpsAPI methods
 * @author stubbfel
 * @since 20.06.2013
 */
class SpsApi extends Api {

    /**
     * Keyword for alias arguments
     * @var string
     */
    public static $keyAlias = "alias";

    /**
     * Keyword for domain arguments
     * @var string
     */
    public static $keyDomain = "domain";

    /**
     * Keyword for polygon arguments
     * @var string
     */
    public static $keyPoly = "poly";

    /**
     * Keyword for longitude arguments
     * @var string
     */
    public static $keyLong = "longitude";

    /**
     * Keyword for latitude arguments
     * @var string
     */
    public static $keyLat = "latitude";

    /*
     * Varible for the range of the searchpolygon
     * @var float
     */
    private $range = 1;

    /*
     * Varible for the fist chars of the string for a Polygon
     * @var string
     */
    private $polyStartStr = "GeomFromText('Polygon((";

    /*
     * Varible for the last chars of the string for a Polygon
     * @var string
     */
    private $polyEndStr = "))'";

    /**
     * maximum value of latitude
     * @var float
     */
    private $maxLat = 180;

    /**
     * minimum value of latitude
     * @var float
     */
    private $minLat = -180;
    
        /**
     * maximum value of longitude
     * @var float
     */
    private $maxLong = 180;

    /**
     * minimum value of longitude
     * @var float
     */
    private $minLong = -180;

    /**
     * Default-Constructor
     */
    public function __construct() {
        $this->sqlManager = new \database\SpsSqlManager();
        parent::__construct();
        $this->contentType("Content-type: application/xml;charset=utf-8");
    }

    /**
     * Default-DeConstructor
     */
    public function __destruct() {
        parent::__destruct();
    }

    /**
     * Method start a sps-query(alias)
     * @param array $queryArgs
     * @return querry result as xml
     */
    public function sendSpsAliasQuery($queryArgs = array()) {
        $result = $this->sqlManager->sendSpsAliasQuery($queryArgs);
        return \utiliy\XmlManager::arrayToSpsXml($result);
    }

    /**
     * Method start a sps-query(Coordinates)
     * @param array $queryArgs
     * @return querry result as xml
     */
    public function sendSpsCoordinateQuery($queryArgs = array()) {
        if (!array_key_exists(SpsApi::$keyLong, $queryArgs) || !array_key_exists(SpsApi::$keyLat, $queryArgs)) {
            return null;
        }
        $latitude = $queryArgs[SpsApi::$keyLat];
        $longitude = $queryArgs[SpsApi::$keyLong];

        if (!$this->validLatitude($latitude) || !$this->validLongitude($longitude)) {
            return null;
        }

        $queryArgs[SpsApi::$keyPoly] = $this->createPolygon($latitude, $longitude, $this->range);
        $result = $this->sqlManager->sendSpsCoordinateQuery($queryArgs);
        return \utiliy\XmlManager::arrayToSpsXml($result);
    }

    /**
     * Method check if a string is a valid Longitude
     * @param string $string
     * @return bool
     */
    private function validLongitude($string) {
        $digitLessPoint = str_replace(".", "", $string);
        $digit = str_replace("-", "", $digitLessPoint);
        if (ctype_digit($digit)) {
            if ($string <= $this->maxLong && $string >= $this->minLong) {
                return TRUE;
            }
        };
        return FALSE;
    }

    /**
     * Method check if a string is a valid Latitude
     * @param strinf $string
     * @return bool
     */
    private function validLatitude($string) {
        $digitLessPoint = str_replace(".", "", $string);
        $digit = str_replace("-", "", $digitLessPoint);
        if (ctype_digit($digit)) {
            if ($string <= $this->maxLat && $string >= $this->minLat) {
                return TRUE;
            }
        };
        return FALSE;
    }

    /**
     * Method create a Polygon
     * @param float $latitude
     * @param float $longitude
     * @param float $range
     * @return string
     */
    private function createPolygon($latitude, $longitude, $range) {
        $minLat = $latitude - $range;
        $minLong = $longitude - $range;
        $maxLat = $latitude + $range;
        $maxLong = $longitude + $range;
        return $this->polyStartStr . "$minLat $minLong,$minLat $maxLong,$maxLat $maxLong,$maxLat $minLong,$minLat $minLong" . $this->polyEndStr;
    }

}

?>