<?php
namespace Common\Alias;

use function Safe\{fopen,fclose,fwrite};
use Common\Concept\File as FileInterface;

abstract class File implements FileInterface
{
    protected string $filename;
    public function setFilename(string $filename): FileInterface
    {
        $this->filename = $filename;
        return $this;
    }
    public function getFilename(): string
    {
        return $this->filename;
    }

    public function isDir(): bool
    {
        return is_dir($this->getFilename());
    }
    public function isReadable(): bool
    {
        return is_readable($this->getFilename());
    }
    public function isWriteable(): bool
    {
        return is_writeable($this->getFilename());
    }

    public function read(?int $length = null): string
    {
        $fh = fopen($this->getFilename(), 'r');
        $str = fgets($fh, $length);
        fclose($fh);
        return $str;
    }
    public function write(string $data, ?int $length = null): void
    {
        $fh = fopen($this->getFilename(), 'r');
        fwrite($fh, $data, $length);
        fclose($fh);
    }
}