<?php

namespace database;

include_once "../../global.inc.php";
include_once PATH_UTILITTY . "/StringManager.php";
require_once PATH_DATABASE . "/SqlManager.php";

/**
 * Description of SpsSqlManager
 * 
 * @author stubbfel
 * @since 20.06.2013
 */
class SpsSqlManager extends SQLManager {

    /**
     * Fieldname of the placeID
     * @var string
     */
    public static $placeId = "id";

    /**
     * Fieldname of the parendId
     * @var string
     */
    public static $parentId = "parent";

    /**
     * Fieldname of the refpoint
     * @var string
     */
    public static $refpoint = "refpoint";

    /**
     * String for the select part of the query
     * @var string
     */
    private static $selectTerm = "SELECT DISTINCT id, parent, refpoint FROM sps WHERE ";

    /**
     * String for the alias part of the query
     * @var string
     */
    private static $aliasTerm = "alias = ";

    /**
     * String for the did part of the query
     * @var string
     */
    private static $domainTerm = "did = ";

    /**
     * String for the dNamet part of the query
     * @var string
     */
    private static $domainNameTerm = "dName = ";

    /**
     * first part of  intersect-function
     * @var string
     */
    private static $interSectTermStart = "Intersects(";

    /**
     * last part of  intersect-function
     * @var string
     */
    private static $interSectTermEnd = "),plan)";

    /**
     * first part of  GeomFromText('Polygon-function
     * @var string
     */
    private static $polyStartStr = "GeomFromText('Polygon((";

    /**
     * last part of  GeomFromText('Polygon-function
     * @var string
     */
    private static $polyEndStr = "))'";

    /**
     * maximium length of the value-string for an aliasname
     * @var int
     */
    private static $aliasMaxLenght = 32;

    /**
     * maximium length of the value-string for a domainname
     * @var int
     */
    private static $domainMaxLenght = 32;

    /**
     * Default-Constructor
     */
    public function __construct() {
        parent::__construct();
    }

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

    /**
     * Methods send an query for the sps-service depends of alias
     * @param array $queryArgs
     * @return array [num][assoc]
     */
    public function sendSpsAliasQuery($queryArgs) {

        // check arguments of the query
        if (array_key_exists(\api\SpsApi::$keyAlias, $queryArgs)) {
            $alias = $queryArgs[\api\SpsApi::$keyAlias];
        } else {
            return null;
        }

        $domain = null;
        if (array_key_exists(\api\SpsApi::$keyDomain, $queryArgs)) {
            $domain = $queryArgs[\api\SpsApi::$keyDomain];
        }

        // build query string
        $query = self::$selectTerm;
        if ($this->validAliasString($alias)) {
            $query .= self::$aliasTerm . self::$quoteTerm . $alias . self::$quoteTerm . $this->addDomainTerm($domain);
        } else {
            return null;
        }

        // send query
        return $this->query($query);
    }

    /**
     * Methods send an query for the sps-service depends of coordinates
     * @param array $queryArgs
     * @return array [num][assoc]
     */
    public function sendSpsCoordinateQuery($queryArgs) {

        // check arguments of the query
        if (array_key_exists(\api\SpsApi::$keyPoly, $queryArgs)) {
            $poly = $queryArgs[\api\SpsApi::$keyPoly];
        } else {
            return null;
        }

        $domain = null;
        if (array_key_exists(\api\SpsApi::$keyDomain, $queryArgs)) {
            $domain = $queryArgs[\api\SpsApi::$keyDomain];
        }

        // build query string
        if ($this->validPolyString($poly)) {
            $query = self::$selectTerm . self::$interSectTermStart . $poly . self::$interSectTermEnd . $this->addDomainTerm($domain);
        } else {
            return null;
        }

        // send query
        return $this->query($query);
    }

    /**
     * Method create the correct domain part depends of $domain. If it is a number => did
     * otherwise => dName
     * @param string $domain
     * @return string
     */
    private function addDomainTerm($domain) {
        $result = null;
        if ($domain != null && $this->validDomainString($domain)) {
            if ($this->isDid($domain)) {
                $result .= self::$andTerm . self::$domainTerm . self::$quoteTerm . $domain . self::$quoteTerm;
            } else {
                $result .= self::$andTerm . self::$domainNameTerm . self::$quoteTerm . $domain . self::$quoteTerm;
            }
        }
        return $result;
    }

    /**
     * Method check if the input value for the alias is valid
     * @param string $alias
     * @return boolean
     */
    private function validAliasString($alias) {
        if (\utiliy\StringManager::validSQLString($alias) && ctype_alnum($alias) && strlen($alias) <= self::$aliasMaxLenght) {
            return TRUE;
        }
        return FALSE;
    }

    /**
     * Method check if the input value for the alias is valid
     * @param string $domain
     * @return boolean
     */
    private function validDomainString($domain) {
        if (\utiliy\StringManager::validSQLString($domain) && ctype_alnum($domain) && strlen($domain) <= self::$domainMaxLenght) {
            return TRUE;
        }
        return FALSE;
    }

    /**
     * Method check if the input value for the polygon is valid
     * @param string $poly
     * @return boolean
     */
    private function validPolyString($poly) {
        if (\utiliy\StringManager::validSQLString($poly) && \utiliy\StringManager::startsWith($poly, self::$polyStartStr) && \utiliy\StringManager::endsWith($poly, self::$polyEndStr)) {
            return TRUE;
        }
        return FALSE;
    }

    /**
     *  Method check if the ntring is a did
     * @param string $string
     * @return boolean
     */
    private function isDid($string) {
        return ctype_digit($string);
    }

}

?>