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

    namespace Cz\InnuDb;

    class InnuDb
    {
        /** @var  string */
        private $path;

        /** @var  array */
        private $data;

        /** @var  bool @internal */
        private $dataLoaded = FALSE;

        /** @var  Loader */
        private $loader;



        /**
         * @param   Loader
         * @param   string
         * @throws  InnuDbException
         */
        public function __construct(Loader $loader, $path)
        {
            $this->loader = $loader;
            $this->path = realpath($path);

            if($this->path === FALSE)
            {
                throw new InnuDbException("Data file not found in $path");
            }
        }



        /**
         * @return  string
         */
        public function getPath()
        {
            return $this->path;
        }



        /**
         * @return  mixed
         */
        public function getData()
        {
            if(!$this->dataLoaded)
            {
                $this->data = (array) $this->loader->load($this->path);
                $this->dataLoaded = TRUE;
            }

            return $this->data;
        }



        /**
         * @param   string|NULL
         * @return  Collection
         * @throws  InnuDbException
         */
        public function createCollection($subset = NULL)
        {
            $data = $this->getData();

            if($subset !== NULL)
            {
                if(!isset($data[$subset]))
                {
                    throw new InnuDbException("Collection: data subset '$subset' missing.");
                }

                $data = $data[$subset];
            }

            $collection = new Collection($data);

            return $collection;
        }
    }



    class InnuDbException extends \RuntimeException
    {
    }