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<?php

    namespace Inteve\FeedGenerator\Outputs;

    use Inteve\FeedGenerator\FileSystemException;
    use Inteve\FeedGenerator\IOutput;
    use Inteve\FeedGenerator\OutputException;


    class FileOutput implements IOutput
    {
        /** @var string */
        private $file;

        /** @var resource */
        private $fp;

        /** @var bool */
        private $opened = FALSE;


        /**
         * @param  string
         */
        public function __construct($file)
        {
            $this->file = $file;
        }


        /**
         * @return void
         * @throws FileSystemException
         */
        public function open()
        {
            if (!$this->opened) {
                @mkdir(dirname($this->file), 0777, TRUE);
                $fp = @fopen($this->file, 'w');

                if ($fp === FALSE) {
                    throw new FileSystemException("File '{$this->file}' is not writable.");
                }

                $this->fp = $fp;
                $this->opened = TRUE;
            }
        }


        /**
         * @param  string
         * @return void
         * @throws OutputException
         */
        public function output($s)
        {
            if (!$this->opened) {
                throw new OutputException("File is not open, call open() method.");
            }
            fwrite($this->fp, $s);
        }


        /**
         * @return void
         */
        public function close()
        {
            if ($this->opened) {
                fclose($this->fp);
                $this->opened = FALSE;
            }
        }
    }