<?php

namespace Sabre\DAV\FS;

use Sabre\DAV;

/**
 * Directory class
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class Directory extends Node implements DAV\ICollection, DAV\IQuota {

    /**
     * Creates a new file in the directory
     *
     * Data will either be supplied as a stream resource, or in certain cases
     * as a string. Keep in mind that you may have to support either.
     *
     * After successful creation of the file, you may choose to return the ETag
     * of the new file here.
     *
     * The returned ETag must be surrounded by double-quotes (The quotes should
     * be part of the actual string).
     *
     * If you cannot accurately determine the ETag, you should not return it.
     * If you don't store the file exactly as-is (you're transforming it
     * somehow) you should also not return an ETag.
     *
     * This means that if a subsequent GET to this new file does not exactly
     * return the same contents of what was submitted here, you are strongly
     * recommended to omit the ETag.
     *
     * @param string $name Name of the file
     * @param resource|string $data Initial payload
     * @return null|string
     */
    function createFile($name, $data = null) {

        $newPath = $this->path . '/' . $name;
        file_put_contents($newPath, $data);
        clearstatcache(true, $newPath);

    }

    /**
     * Creates a new subdirectory
     *
     * @param string $name
     * @return void
     */
    function createDirectory($name) {

        $newPath = $this->path . '/' . $name;
        mkdir($newPath);
        clearstatcache(true, $newPath);

    }

    /**
     * Returns a specific child node, referenced by its name
     *
     * This method must throw DAV\Exception\NotFound if the node does not
     * exist.
     *
     * @param string $name
     * @throws DAV\Exception\NotFound
     * @return DAV\INode
     */
    function getChild($name) {

        $path = $this->path . '/' . $name;

        if (!file_exists($path)) throw new DAV\Exception\NotFound('File with name ' . $path . ' could not be located');

        if (is_dir($path)) {

            return new self($path);

        } else {

            return new File($path);

        }

    }

    /**
     * Returns an array with all the child nodes
     *
     * @return DAV\INode[]
     */
    function getChildren() {

        $nodes = [];
        $iterator = new \FilesystemIterator(
            $this->path,
            \FilesystemIterator::CURRENT_AS_SELF
          | \FilesystemIterator::SKIP_DOTS
        );
        foreach ($iterator as $entry) {

            $nodes[] = $this->getChild($entry->getFilename());

        }
        return $nodes;

    }

    /**
     * Checks if a child exists.
     *
     * @param string $name
     * @return bool
     */
    function childExists($name) {

        $path = $this->path . '/' . $name;
        return file_exists($path);

    }

    /**
     * Deletes all files in this directory, and then itself
     *
     * @return void
     */
    function delete() {

        foreach ($this->getChildren() as $child) $child->delete();
        rmdir($this->path);

    }

    /**
     * Returns available diskspace information
     *
     * @return array
     */
    function getQuotaInfo() {
        $absolute = realpath($this->path);
        return [
            disk_total_space($absolute) - disk_free_space($absolute),
            disk_free_space($absolute)
        ];

    }

}