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<?php

    namespace CzProject\Configuration;


    class ConfigLoader
    {
        /** @var array  [extension => IConfigAdapter] */
        protected $adapters = array();


        /**
         * @param  string
         * @return self
         */
        public function addAdapter($extension, IAdapter $adapter)
        {
            $this->adapters[strtolower($extension)] = $adapter;
            return $this;
        }


        /**
         * @param  string
         * @return array
         * @throws ConfigLoaderException
         */
        public function loadConfig($file)
        {
            $extension = strtolower(pathinfo($file, PATHINFO_EXTENSION));

            if ($extension === '') {
                throw new ConfigLoaderException("Missing extension for file '$file'.");
            }

            if (!isset($this->adapters[$extension])) {
                throw new ConfigLoaderException("Missing adapter for extension '$extension', file '$file'.");
            }

            $adapter = $this->adapters[$extension];

            if ($adapter instanceof IAdapterLoader) {
                return (array) $adapter->loadConfig($file);
            }

            if ($adapter instanceof IAdapterParser) {
                $content = file_get_contents($file);

                if ($content === FALSE) {
                    throw new ConfigLoaderException("Reading of file '$file' failed.");
                }

                return (array) $adapter->parseConfig($content);
            }

            throw new ConfigLoaderException("Adapter must implement IAdapterLoader or IAdapterParser.");
        }
    }