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    <?php
    namespace Catapult;

    /**
     * Base functions
     * for dealing with
     * responses, headers
     * content and internal type
     * handling
     */
    class BaseUtilities {
          /**
           * check for multidimensional array, or objects.
           *
           * perform a shallow inspection
           * traversing each object/array, would be too slow
           * @param context: array or object
           */
          public static function is_multidimensional($context, $shallow=true)
          {
            if (!(sizeof($context) > 0)) {
                 return FALSE;
            }

            if ($shallow && (is_array($context[0]) || is_object($context[0]))) {
                 return TRUE;
            }

            return false;
          }

          /**
           * camelcase the provided
           * text. same as default
           * if already camelized
           */
          public static function camelcase()
          {
            $c = "";

            foreach ($array as $a)
                $c .= ucwords($a);

            return $c;

          }

          /**
           * find a particular item
           * in a parsed headers array
           * @param assoc header array
           * @param term term to get
           */
          public static function find($headers, $term)
          {
            if (!(isset($headers[$term]))) {
              throw new \CatapultApiException("No header found as $term:");
            }

            return $headers[$term];
          }

          /**
           * internal:
           * are the two Catapult types
           * the same
           *
           * @param var1: array or object
           * @param var2: array or object
           */
          public static function same_type(&$var1, &$var2){
              return gettype($var1) === gettype($var2);
          }

          /**
           * perform on an object or array
           * returning its property or index
           *
           * @param object: array or object
           * @param prop: property
           */
          public static function prop_or_arr($obj, $key) {
            if (is_object($obj) && array_key_exists($key, get_object_vars($obj))) {
                return $obj->$key;
            }

            if (is_array($obj) && isset($obj[$key])) {
                return $obj[$key];
            }

            return false;
          }

          /**
           * make an assoc array
           * from a func_get_args/1
           * passing, must have
           * key array. Follows numerical order
           */

          public static function assoc($arr, $keys) {
            $out = array();
            foreach ($arr as $cnt => $a) {
                $out[$keys[$cnt]] = $a;
            }

            return $out;
          }

        /**
         * Checks if two objects
         * are references of each
         * other
         *
         * @param var1: array or object
         * @param var2: array or object
         */
        public static function is_ref(&$var1, &$var2) {
          //If a reference exists, the type IS the same
          if(!self::same_type($var1, $var2)) {
              return false;
          }

          $same = false;

          if(is_array($var1)) {
           do {
               $key = uniqid("is_ref_", true);
           } while(array_key_exists($key, $var1));

           //The two variables differ in content ... They can't be the same
           if(array_key_exists($key, $var2)) {
             return false;
           }

           //The arrays point to the same data if changes are reflected in $var2
           $data = uniqid("is_ref_data_", true);
           $var1[$key] =& $data;
           //There seems to be a modification ...
           if(array_key_exists($key, $var2)) {
              if($var2[$key] === $data) {
                   $same = true;
              }
           }

            //Undo our changes ...
            unset($var1[$key]);
          } elseif(is_object($var1)) {
            //The same objects are required to have equal class names ;-)
            if(get_class($var1) !== get_class($var2)) {
               return false;
            }

            $obj1 = array_keys(get_object_vars($var1));
            $obj2 = array_keys(get_object_vars($var2));

            //Look for an unused index in $var1
            do {
             $key = uniqid("is_ref_", true);
            } while(in_array($key, $obj1));

            //The two variables differ in content ... They can't be the same
            if(in_array($key, $obj2)) {
              return false;
            }

            //The arrays point to the same data if changes are reflected in $var2
            $data = uniqid("is_ref_data_", true);
            $var1->$key =& $data;
            //There seems to be a modification ...
            if(isset($var2->$key)) {
              if($var2->$key === $data) {
                 $same = true;
              }
            }

              //Undo our changes ...
              unset($var1->$key);
            } elseif (is_resource($var1)) {
              if(get_resource_type($var1) !== get_resource_type($var2)) {
                 return false;
              }

              return ((string) $var1) === ((string) $var2);
            } else {
              //Simple variables ...
              if($var1!==$var2) {
                //Data mismatch ... They can't be the same ...
                return false;
              }

              //To check for a reference of a variable with simple type
              //simply store its old value and check against modifications of the second variable ;-)

              do {
                $key = uniqid("is_ref_", true);
              } while($key === $var1);

              $tmp = $var1; //WE NEED A COPY HERE!!!
              $var1 = $key; //Set var1 to the value of $key (copy)
              $same = $var1 === $var2; //Check if $var2 was modified too ...
              $var1 = $tmp; //Undo our changes ...
            }

              return $same;
            }

           /**
            * make a catapult formatted
            * date a native PHP date or unix
            * stamp
            * @param date: Catapult date (2015-01-12T13:49:43Z) format
            * @param std: Standard PHP dates
            */
           public function datefromApi($date, $std = false) {
             $object = \DateTime::createFromFormat(API::API_DATE_FORMAT, $date);

              if ($std) {
                return getdate($object->getTimestamp());
              }

              return $object;
            }

           /**
            * date to Catapult
            * format. Catapult\Date
            * uses this
            ** deprecate Catapult\DateStamp in place of this
            * @param date
            */
          public function dateToApi($date) {
            $object = new \DateTime;

            return $object(API::API_DATE_FORMAT);
          }
    }