<?php
/**
 * @package     Awf
 * @copyright   2014 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license     GNU GPL version 3 or later
 */

namespace Awf\Filesystem;

/**
 * Filesystem abstraction interface.
 *
 * The filesystem abstraction lets us perform operations on local files either directly or through and (S)FTP access
 * layer, e.g. on hosts which run (S)FTP and the web server under different users. As you can see there are is read
 * operation. We assume that files are readable directly at all times.
 *
 * @codeCoverageIgnore
 */
interface FilesystemInterface
{
	/**
	 * Public constructor
	 *
	 * @param   array   $options  Configuration options for the filesystem abstraction object
	 *
	 * @return  FilesystemInterface
	 */
	public function __construct(array $options);

	/**
	 * Write the contents into the file
	 *
	 * @param   string  $fileName  The full path to the file
	 * @param   string  $contents  The contents to write to the file
	 *
	 * @return  boolean  True on success
	 */
	public function write($fileName, $contents);

	/**
	 * Delete a file (remove it from the disk)
	 *
	 * @param   string  $fileName  The full path to the file
	 *
	 * @return  boolean  True on success
	 */
	public function delete($fileName);

	/**
	 * Create a copy of the file
	 *
	 * @param   string  $from  The full path of the file to copy from
	 * @param   string  $to    The full path of the file that will hold the copy
	 *
	 * @return  boolean  True on success
	 */
	public function copy($from, $to);

	/**
	 * Move or rename a file
	 *
	 * @param   string  $from  The full path of the file to move
	 * @param   string  $to    The full path of the target file
	 *
	 * @return  boolean  True on success
	 */
	public function move($from, $to);

	/**
	 * Change the permissions of a file
	 *
	 * @param   string   $fileName     The full path of the file whose permissions will change
	 * @param   integer  $permissions  The new permissions, e.g. 0644 (remember the leading zero in octal numbers!)
	 *
	 * @return  boolean  True on success
	 */
	public function chmod($fileName, $permissions);

	/**
	 * Create a directory if it doesn't exist. The operation is implicitly recursive, i.e. it will create all
	 * intermediate directories if they do not already exist.
	 *
	 * @param   string   $dirName      The full path of the directory to create
	 * @param   integer  $permissions  The permissions of the created directory
	 *
	 * @return  boolean  True on success
	 */
	public function mkdir($dirName, $permissions = 0755);

	/**
	 * Remove a directory if it exists.
	 *
	 * @param   string   $dirName    The full path of the directory to remove
	 * @param   boolean  $recursive  Should I remove its contents recursively? Otherwise it will fail if the directory
	 *                               is not empty.
	 *
	 * @return mixed
	 */
	public function rmdir($dirName, $recursive = true);

	/**
	 * Translate an absolute filesystem path into a relative path for use by the filesystem abstraction, e.g. a relative
	 * (S)FTP path
	 *
	 * @param   string  $fileName  The full filesystem path of a file or directory
	 *
	 * @return  string  The translated path for use by the filesystem abstraction
	 */
	public function translatePath($fileName);

	/**
	 * Lists the subdirectories inside a directory
	 *
	 * @param   null|string  $dir  The directory to scan. Skip to use the current directory.
	 *
	 * @return  array|bool  A list of folders, or false if we could not get a listing
	 *
	 * @throws  \RuntimeException  When the server is incompatible with our folder scanner
	 */
	public function listFolders($dir = null);
} 