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<?php
    /**
     * CzProject Innu DB
     *
     * @author      Jan Pecha, <janpecha@email.cz>
     */

    namespace Cz\InnuDb;
    use Nette;

    class Loader
    {
        protected $adapters = array(
            'php' => 'Nette\Config\Adapters\PhpAdapter',
            'ini' => 'Nette\Config\Adapters\IniAdapter',
            'neon' => 'Nette\Config\Adapters\NeonAdapter',
            'json' => 'Cz\InnuDb\Adapters\JsonAdapter',
        );



        /**
         * Inspired by Nette Framework
         * @param   string
         * @return  mixed
         */
        public function load($file)
        {
            if(!is_file($file) || !is_readable($file))
            {
                throw new Nette\FileNotFoundException("File '$file' is missing or is not readable.");
            }

            return $this->getAdapter($file)->load($file);
        }



        /**
         * Method from Nette Framework
         * @author  David Grudl, Nette Foundation, Nette Community
         * @param   string
         * @param   mixed
         * @return  void
         */
        public function save($file, $data)
        {
            if(file_put_contents($file, $this->getAdapter($file)->dump($data)) === FALSE)
            {
                throw new Nette\IOException("Cannot write file '$file'.");
            }
        }



        /**
         * Method from Nette Framework
         * @author  David Grudl, Nette Foundation, Nette Community
         * @param   string
         * @param   string|Nette\Config\IAdapter
         * @return  Loader  provides a fluent interface
         */
        public function addAdapter($extension, $adapter)
        {
            $this->adapters[strtolower($extension)] = $adapter;
            return $this;
        }



        /**
         * Method from Nette Framework
         * @author  David Grudl, Nette Foundation, Nette Community
         * @param   string
         * @return  Nette\Config\IAdapter
         */
        private function getAdapter($file)
        {
            $extension = strtolower(pathinfo($file, PATHINFO_EXTENSION));

            if(!isset($this->adapters[$extension]))
            {
                throw new Nette\InvalidArgumentException("Unknown file extension '$file'.");
            }

            return is_object($this->adapters[$extension]) ? $this->adapters[$extension] : new $this->adapters[$extension];
        }
    }