<?php

    /**
     * NRE
     *
     * @author      coderkun <olli@coderkun.de>
     * @copyright   2013 coderkun (http://www.coderkun.de)
     * @license     http://www.gnu.org/licenses/gpl.html
     * @link        http://www.coderkun.de/projects/nre
     */

    namespace nre\core;


    /**
     * Class for safely loading classes.
     * 
     * @author  coderkun <olli@coderkun.de>
     */
    class ClassLoader
    {


        /**
         * Load a class.
         * 
         * @throws  \nre\exceptions\ClassNotFoundException
         * @param   string  $className  Name of the class to load
         */
        public static function load($fullClassName)
        {
            // Determine folder to look in
            $className = explode('\\', $fullClassName);
            $className = array_slice($className, substr_count(\nre\configs\AppConfig::$app['namespace'], '\\'));

            // Determine filename
            $fileName = ROOT.DS.implode(DS, $className). \nre\configs\CoreConfig::getFileExt('includes');


            // Check file
            if(!file_exists($fileName))
            {
                throw new \nre\exceptions\ClassNotFoundException(
                    $fullClassName
                );
            }

            // Include file
            include_once($fileName);
        }


        /**
         * Check inheritance of a class.
         * 
         * @throws  \nre\exceptions\ClassNotValidException
         * @param   string  $className          Name of the class to check
         * @param   string  $parentClassName    Name of the parent class
         */
        public static function check($className, $parentClassName)
        {
            // Check if class is subclass of parent class
            if(!is_subclass_of($className, $parentClassName)) {
                throw new \nre\exceptions\ClassNotValidException(
                    $className
                );
            }
        }


        /**
         * Strip the namespace from a class name.
         * 
         * @param   string  $class  Name of a class including its namespace
         * @return  string          Name of the given class without its namespace
         */
        public static function stripNamespace($class)
        {
            return array_slice(explode('\\', $class), -1)[0];
        }


        /**
         * Strip the class type from a class name.
         * 
         * @param   string  $className  Name of a class
         * @return  string              Name of the given class without its class type
         */
        public static function stripClassType($className)
        {
            return preg_replace('/^(.*)[A-Z][^A-Z]+$/', '$1', $className);
        }


        /**
         * Strip the namespace and the class type of a full class name
         * to get only its name.
         * 
         * @param   string  $class  Full name of a class
         * @return  string          Only the name of the given class
         */
        public static function getClassName($class)
        {
            return self::stripClassType(self::stripNamespace($class));
        }


        /**
         * Concatenate strings to a class name following the CamelCase
         * pattern.
         * 
         * @param   string  $className1 Arbitrary number of strings to concat
         * @return  string              Class name as CamelCase
         */
        public static function concatClassNames($className1)
        {
            return implode('', array_map(
                function($arg) {
                    return ucfirst(strtolower($arg));
                },
                func_get_args()
            ));
        }

    }

?>