<?php

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Core\Resource;

use TYPO3\CMS\Core\Resource\Exception\InsufficientFolderAccessPermissionsException;
use TYPO3\CMS\Core\Resource\Exception\ResourcePermissionsUnavailableException;
use TYPO3\CMS\Core\Resource\Search\FileSearchDemand;
use TYPO3\CMS\Core\Resource\Search\Result\FileSearchResultInterface;
use TYPO3\CMS\Core\Utility\PathUtility;

/**
 * A folder that groups files in a storage. This may be a folder on the local
 * disk, a bucket in Amazon S3 or a user or a tag in Flickr.
 *
 * This object is not persisted in TYPO3 locally, but created on the fly by
 * storage drivers for the folders they "offer".
 *
 * Some folders serve as a physical container for files (e.g. folders on the
 * local disk, S3 buckets or Flickr users). Other folders just group files by a
 * certain criterion, e.g. a tag.
 * The way this is implemented depends on the storage driver.
 */
class Folder implements FolderInterface
{
    /**
     * The storage this folder belongs to.
     *
     * @var ResourceStorage
     */
    protected $storage;

    /**
     * The identifier of this folder to identify it on the storage.
     * On some drivers, this is the path to the folder, but drivers could also just
     * provide any other unique identifier for this folder on the specific storage.
     *
     * @var string
     */
    protected $identifier;

    /**
     * The name of this folder
     *
     * @var string
     */
    protected $name;

    /**
     * The filters this folder should use for a filelist.
     *
     * @var callable[]
     */
    protected $fileAndFolderNameFilters = [];

    /**
     * Modes for filter usage in getFiles()/getFolders()
     */
    const FILTER_MODE_NO_FILTERS = 0;
    // Merge local filters into storage's filters
    const FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS = 1;
    // Only use the filters provided by the storage
    const FILTER_MODE_USE_STORAGE_FILTERS = 2;
    // Only use the filters provided by the current class
    const FILTER_MODE_USE_OWN_FILTERS = 3;

    /**
     * Initialization of the folder
     *
     * @param ResourceStorage $storage
     * @param string $identifier
     * @param string $name
     */
    public function __construct(ResourceStorage $storage, $identifier, $name)
    {
        $this->storage = $storage;
        $this->identifier = $identifier;
        $this->name = $name;
    }

    /**
     * Returns the name of this folder.
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Returns the full path of this folder, from the root.
     *
     * @param string $rootId ID of the root folder, NULL to auto-detect
     *
     * @return string
     */
    public function getReadablePath($rootId = null)
    {
        if ($rootId === null) {
            // Find first matching filemount and use that as root
            foreach ($this->storage->getFileMounts() as $fileMount) {
                if ($this->storage->isWithinFolder($fileMount['folder'], $this)) {
                    $rootId = $fileMount['folder']->getIdentifier();
                    break;
                }
            }
            if ($rootId === null) {
                $rootId = $this->storage->getRootLevelFolder()->getIdentifier();
            }
        }
        $readablePath = '/';
        if ($this->identifier !== $rootId) {
            try {
                $readablePath = $this->getParentFolder()->getReadablePath($rootId);
            } catch (InsufficientFolderAccessPermissionsException $e) {
                // May no access to parent folder (e.g. because of mount point)
                $readablePath = '/';
            }
        }
        return $readablePath . ($this->name ? $this->name . '/' : '');
    }

    /**
     * Sets a new name of the folder
     * currently this does not trigger the "renaming process"
     * as the name is more seen as a label
     *
     * @param string $name The new name
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    /**
     * Returns the storage this folder belongs to.
     *
     * @return ResourceStorage
     */
    public function getStorage()
    {
        return $this->storage;
    }

    /**
     * Returns the path of this folder inside the storage. It depends on the
     * type of storage whether this is a real path or just some unique identifier.
     *
     * @return string
     */
    public function getIdentifier()
    {
        return $this->identifier;
    }

    /**
     * Get hashed identifier
     *
     * @return string
     */
    public function getHashedIdentifier()
    {
        return $this->storage->hashFileIdentifier($this->identifier);
    }

    /**
     * Returns a combined identifier of this folder, i.e. the storage UID and
     * the folder identifier separated by a colon ":".
     *
     * @return string Combined storage and folder identifier, e.g. StorageUID:folder/path/
     */
    public function getCombinedIdentifier()
    {
        return $this->getStorage()->getUid() . ':' . $this->getIdentifier();
    }

    /**
     * Returns a publicly accessible URL for this folder
     *
     * WARNING: Access to the folder may be restricted by further means, e.g. some
     * web-based authentication. You have to take care of this yourself.
     *
     * @param bool $relativeToCurrentScript Determines whether the URL returned should be relative to the current script, in case it is relative at all (only for the LocalDriver). Deprecated since TYPO3 v11, will be removed in TYPO3 v12.0
     * @return string|null NULL if file is missing or deleted, the generated url otherwise
     */
    public function getPublicUrl($relativeToCurrentScript = false)
    {
        // @deprecated $relativeToCurrentScript since v11, will be removed in TYPO3 v12.0
        return $this->getStorage()->getPublicUrl($this, $relativeToCurrentScript);
    }

    /**
     * Returns a list of files in this folder, optionally filtered. There are several filter modes available, see the
     * FILTER_MODE_* constants for more information.
     *
     * For performance reasons the returned items can also be limited to a given range
     *
     * @param int $start The item to start at
     * @param int $numberOfItems The number of items to return
     * @param int $filterMode The filter mode to use for the filelist.
     * @param bool $recursive
     * @param string $sort Property name used to sort the items.
     *                     Among them may be: '' (empty, no sorting), name,
     *                     fileext, size, tstamp and rw.
     *                     If a driver does not support the given property, it
     *                     should fall back to "name".
     * @param bool $sortRev TRUE to indicate reverse sorting (last to first)
     * @return \TYPO3\CMS\Core\Resource\File[]
     */
    public function getFiles($start = 0, $numberOfItems = 0, $filterMode = self::FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS, $recursive = false, $sort = '', $sortRev = false)
    {
        // Fallback for compatibility with the old method signature variable $useFilters that was used instead of $filterMode
        if ($filterMode === false) {
            $useFilters = false;
            $backedUpFilters = [];
        } else {
            [$backedUpFilters, $useFilters] = $this->prepareFiltersInStorage($filterMode);
        }

        $fileObjects = $this->storage->getFilesInFolder($this, $start, $numberOfItems, $useFilters, $recursive, $sort, $sortRev);

        $this->restoreBackedUpFiltersInStorage($backedUpFilters);

        return $fileObjects;
    }

    /**
     * Returns a file search result based on the given demand.
     * The result also includes matches in meta data fields that are defined in TCA.
     *
     * @param FileSearchDemand $searchDemand
     * @param int $filterMode The filter mode to use for the found files
     * @return FileSearchResultInterface
     */
    public function searchFiles(FileSearchDemand $searchDemand, int $filterMode = self::FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS): FileSearchResultInterface
    {
        [$backedUpFilters, $useFilters] = $this->prepareFiltersInStorage($filterMode);
        $searchResult = $this->storage->searchFiles($searchDemand, $this, $useFilters);
        $this->restoreBackedUpFiltersInStorage($backedUpFilters);

        return $searchResult;
    }

    /**
     * Returns amount of all files within this folder, optionally filtered by
     * the given pattern
     *
     * @param array $filterMethods
     * @param bool $recursive
     * @return int
     * @throws Exception\InsufficientFolderAccessPermissionsException
     */
    public function getFileCount(array $filterMethods = [], $recursive = false)
    {
        return $this->storage->countFilesInFolder($this, true, $recursive);
    }

    /**
     * Returns the object for a subfolder of the current folder, if it exists.
     *
     * @param string $name Name of the subfolder
     * @return Folder
     * @throws \InvalidArgumentException
     */
    public function getSubfolder($name)
    {
        if (!$this->storage->hasFolderInFolder($name, $this)) {
            throw new \InvalidArgumentException('Folder "' . $name . '" does not exist in "' . $this->identifier . '"', 1329836110);
        }
        return $this->storage->getFolderInFolder($name, $this);
    }

    /**
     * @param int $start The item to start at
     * @param int $numberOfItems The number of items to return
     * @param int $filterMode The filter mode to use for the filelist.
     * @param bool $recursive
     * @return array<string|int, Folder>
     */
    public function getSubfolders($start = 0, $numberOfItems = 0, $filterMode = self::FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS, $recursive = false)
    {
        [$backedUpFilters, $useFilters] = $this->prepareFiltersInStorage($filterMode);
        $folderObjects = $this->storage->getFoldersInFolder($this, $start, $numberOfItems, $useFilters, $recursive);
        $this->restoreBackedUpFiltersInStorage($backedUpFilters);
        return $folderObjects;
    }

    /**
     * Adds a file from the local server disk. If the file already exists and
     * overwriting is disabled,
     *
     * @param string $localFilePath
     * @param string $fileName
     * @param string $conflictMode a value of the \TYPO3\CMS\Core\Resource\DuplicationBehavior enumeration
     * @return File The file object
     */
    public function addFile($localFilePath, $fileName = null, $conflictMode = DuplicationBehavior::CANCEL)
    {
        $fileName = $fileName ?: PathUtility::basename($localFilePath);
        return $this->storage->addFile($localFilePath, $this, $fileName, $conflictMode);
    }

    /**
     * Adds an uploaded file into the Storage.
     *
     * @param array $uploadedFileData contains information about the uploaded file given by $_FILES['file1']
     * @param string $conflictMode a value of the \TYPO3\CMS\Core\Resource\DuplicationBehavior enumeration
     * @return File The file object
     */
    public function addUploadedFile(array $uploadedFileData, $conflictMode = DuplicationBehavior::CANCEL)
    {
        return $this->storage->addUploadedFile($uploadedFileData, $this, $uploadedFileData['name'], $conflictMode);
    }

    /**
     * Renames this folder.
     *
     * @param string $newName
     * @return Folder
     */
    public function rename($newName)
    {
        return $this->storage->renameFolder($this, $newName);
    }

    /**
     * Deletes this folder from its storage. This also means that this object becomes useless.
     *
     * @param bool $deleteRecursively
     * @return bool TRUE if deletion succeeded
     */
    public function delete($deleteRecursively = true)
    {
        return $this->storage->deleteFolder($this, $deleteRecursively);
    }

    /**
     * Creates a new blank file
     *
     * @param string $fileName
     * @return File The new file object
     */
    public function createFile($fileName)
    {
        return $this->storage->createFile($fileName, $this);
    }

    /**
     * Creates a new folder
     *
     * @param string $folderName
     * @return Folder The new folder object
     */
    public function createFolder($folderName)
    {
        return $this->storage->createFolder($folderName, $this);
    }

    /**
     * Copies folder to a target folder
     *
     * @param Folder $targetFolder Target folder to copy to.
     * @param string $targetFolderName an optional destination fileName
     * @param string $conflictMode a value of the \TYPO3\CMS\Core\Resource\DuplicationBehavior enumeration
     * @return Folder New (copied) folder object.
     */
    public function copyTo(Folder $targetFolder, $targetFolderName = null, $conflictMode = DuplicationBehavior::RENAME)
    {
        return $targetFolder->getStorage()->copyFolder($this, $targetFolder, $targetFolderName, $conflictMode);
    }

    /**
     * Moves folder to a target folder
     *
     * @param Folder $targetFolder Target folder to move to.
     * @param string $targetFolderName an optional destination fileName
     * @param string $conflictMode a value of the \TYPO3\CMS\Core\Resource\DuplicationBehavior enumeration
     * @return Folder New (copied) folder object.
     */
    public function moveTo(Folder $targetFolder, $targetFolderName = null, $conflictMode = DuplicationBehavior::RENAME)
    {
        return $targetFolder->getStorage()->moveFolder($this, $targetFolder, $targetFolderName, $conflictMode);
    }

    /**
     * Checks if a file exists in this folder
     *
     * @param string $name
     * @return bool
     */
    public function hasFile($name)
    {
        return $this->storage->hasFileInFolder($name, $this);
    }

    /**
     * Fetches a file from a folder, must be a direct descendant of a folder.
     *
     * @param string $fileName
     * @return File|ProcessedFile|null
     */
    public function getFile(string $fileName)
    {
        if ($this->storage->hasFileInFolder($fileName, $this)) {
            return $this->storage->getFileInFolder($fileName, $this);
        }
        return null;
    }

    /**
     * Checks if a folder exists in this folder.
     *
     * @param string $name
     * @return bool
     */
    public function hasFolder($name)
    {
        return $this->storage->hasFolderInFolder($name, $this);
    }

    /**
     * Check if a file operation (= action) is allowed on this folder
     *
     * @param string $action Action that can be read, write or delete
     * @return bool
     */
    public function checkActionPermission($action)
    {
        try {
            return $this->getStorage()->checkFolderActionPermission($action, $this);
        } catch (ResourcePermissionsUnavailableException $e) {
            return false;
        }
    }

    /**
     * Updates the properties of this folder, e.g. after re-indexing or moving it.
     *
     * NOTE: This method should not be called from outside the File Abstraction Layer (FAL)!
     *
     * @param array $properties
     * @internal
     */
    public function updateProperties(array $properties)
    {
        // Setting identifier and name to update values
        if (isset($properties['identifier'])) {
            $this->identifier = $properties['identifier'];
        }
        if (isset($properties['name'])) {
            $this->name = $properties['name'];
        }
    }

    /**
     * Prepares the filters in this folder's storage according to a set filter mode.
     *
     * @param int $filterMode The filter mode to use; one of the FILTER_MODE_* constants
     * @return array The backed up filters as an array (NULL if filters were not backed up) and whether to use filters or not (bool)
     */
    protected function prepareFiltersInStorage($filterMode)
    {
        $backedUpFilters = null;
        $useFilters = true;

        switch ($filterMode) {
            case self::FILTER_MODE_USE_OWN_FILTERS:
                $backedUpFilters = $this->storage->getFileAndFolderNameFilters();
                $this->storage->setFileAndFolderNameFilters($this->fileAndFolderNameFilters);

                break;

            case self::FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS:
                if (!empty($this->fileAndFolderNameFilters)) {
                    $backedUpFilters = $this->storage->getFileAndFolderNameFilters();
                    foreach ($this->fileAndFolderNameFilters as $filter) {
                        $this->storage->addFileAndFolderNameFilter($filter);
                    }
                }

                break;

            case self::FILTER_MODE_USE_STORAGE_FILTERS:
                // nothing to do here

                break;

            case self::FILTER_MODE_NO_FILTERS:
                $useFilters = false;

                break;
        }
        return [$backedUpFilters, $useFilters];
    }

    /**
     * Restores the filters of a storage.
     *
     * @param array $backedUpFilters The filters to restore; might be NULL if no filters have been backed up, in
     *                               which case this method does nothing.
     * @see prepareFiltersInStorage()
     */
    protected function restoreBackedUpFiltersInStorage($backedUpFilters)
    {
        if ($backedUpFilters !== null) {
            $this->storage->setFileAndFolderNameFilters($backedUpFilters);
        }
    }

    /**
     * Sets the filters to use when listing files. These are only used if the filter mode is one of
     * FILTER_MODE_USE_OWN_FILTERS and FILTER_MODE_USE_OWN_AND_STORAGE_FILTERS
     *
     * @param array $filters
     */
    public function setFileAndFolderNameFilters(array $filters)
    {
        $this->fileAndFolderNameFilters = $filters;
    }

    /**
     * Returns the role of this folder (if any). See FolderInterface::ROLE_* constants for possible values.
     *
     * @return string
     */
    public function getRole()
    {
        return $this->storage->getRole($this);
    }

    /**
     * Returns the parent folder.
     *
     * In non-hierarchical storages, that always is the root folder.
     *
     * The parent folder of the root folder is the root folder.
     *
     * @return FolderInterface
     */
    public function getParentFolder()
    {
        return $this->getStorage()->getFolder($this->getStorage()->getFolderIdentifierFromFileIdentifier($this->getIdentifier()));
    }

    /**
     * Returns the modification time of the file as Unix timestamp
     *
     * @return int
     */
    public function getModificationTime()
    {
        return $this->storage->getFolderInfo($this)['mtime'];
    }

    /**
     * Returns the creation time of the file as Unix timestamp
     *
     * @return int
     */
    public function getCreationTime()
    {
        return $this->storage->getFolderInfo($this)['ctime'];
    }
}
