space-ios/iOSClient/Main/Collection Common/NCCollectionViewCommon.swift

//
//  NCCollectionViewCommon.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 12/09/2020.
//  Copyright © 2020 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import UIKit
import Realm
import NCCommunication

class NCCollectionViewCommon: UIViewController, UIGestureRecognizerDelegate, UISearchResultsUpdating, UISearchControllerDelegate, UISearchBarDelegate, NCListCellDelegate, NCGridCellDelegate, NCSectionHeaderMenuDelegate, UIAdaptivePresentationControllerDelegate, NCEmptyDataSetDelegate, UIContextMenuInteractionDelegate, NCAccountRequestDelegate, NCBackgroundImageColorDelegate, NCSelectableNavigationView {
    var selectableDataSource: [RealmSwiftObject] { dataSource.metadatas }

    @IBOutlet weak var collectionView: UICollectionView!

    let appDelegate = UIApplication.shared.delegate as! AppDelegate

    internal let refreshControl = UIRefreshControl()
    internal var searchController: UISearchController?
    internal var emptyDataSet: NCEmptyDataSet?
    internal var backgroundImageView = UIImageView()
    internal var serverUrl: String = ""
    internal var isEncryptedFolder = false
    internal var isEditMode = false
    internal var selectOcId: [String] = []
    internal var metadatasSource: [tableMetadata] = []
    internal var metadataFolder: tableMetadata?
    internal var dataSource = NCDataSource()
    internal var richWorkspaceText: String?
    internal var header: NCSectionHeaderMenu?

    internal var layoutForView: NCGlobal.layoutForViewType?

    private var autoUploadFileName = ""
    private var autoUploadDirectory = ""

    internal var listLayout: NCListLayout!
    internal var gridLayout: NCGridLayout!

    private let headerHeight: CGFloat = 50
    private var headerRichWorkspaceHeight: CGFloat = 0
    private let footerHeight: CGFloat = 100

    private var timerInputSearch: Timer?
    internal var literalSearch: String?
    internal var isSearching: Bool = false

    internal var isReloadDataSourceNetworkInProgress: Bool = false

    private var pushed: Bool = false

    // DECLARE
    internal var layoutKey = ""
    internal var titleCurrentFolder = ""
    internal var enableSearchBar: Bool = false
    internal var emptyImage: UIImage?
    internal var emptyTitle: String = ""
    internal var emptyDescription: String = ""

    // MARK: - View Life Cycle

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationController?.presentationController?.delegate = self

        collectionView.alwaysBounceVertical = true

        if enableSearchBar {
            searchController = UISearchController(searchResultsController: nil)
            searchController?.searchResultsUpdater = self
            searchController?.obscuresBackgroundDuringPresentation = false
            searchController?.delegate = self
            searchController?.searchBar.delegate = self
            navigationItem.searchController = searchController
            navigationItem.hidesSearchBarWhenScrolling = false
        }

        // Cell
        collectionView.register(UINib(nibName: "NCListCell", bundle: nil), forCellWithReuseIdentifier: "listCell")
        collectionView.register(UINib(nibName: "NCGridCell", bundle: nil), forCellWithReuseIdentifier: "gridCell")
        collectionView.register(UINib(nibName: "NCTransferCell", bundle: nil), forCellWithReuseIdentifier: "transferCell")

        // Header
        collectionView.register(UINib(nibName: "NCSectionHeaderMenu", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "sectionHeaderMenu")

        // Footer
        collectionView.register(UINib(nibName: "NCSectionFooter", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionFooter, withReuseIdentifier: "sectionFooter")

        listLayout = NCListLayout()
        gridLayout = NCGridLayout()

        // Refresh Control
        collectionView.addSubview(refreshControl)
        refreshControl.action(for: .valueChanged) { _ in
            self.reloadDataSourceNetwork(forced: true)
        }

        // Empty
        emptyDataSet = NCEmptyDataSet(view: collectionView, offset: headerHeight, delegate: self)

        // Long Press on CollectionView
        let longPressedGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPressCollecationView(_:)))
        longPressedGesture.minimumPressDuration = 0.5
        longPressedGesture.delegate = self
        longPressedGesture.delaysTouchesBegan = true
        collectionView.addGestureRecognizer(longPressedGesture)

        // Notification

        NotificationCenter.default.addObserver(self, selector: #selector(initialize), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterInitialize), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(changeTheming), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterChangeTheming), object: nil)

        changeTheming()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        // ACTIVE
        appDelegate.activeViewController = self

        //
        NotificationCenter.default.addObserver(self, selector: #selector(closeRichWorkspaceWebView), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterCloseRichWorkspaceWebView), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(changeStatusFolderE2EE(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterChangeStatusFolderE2EE), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(setNavigationItem), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadAvatar), object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(reloadDataSource(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadDataSource), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(reloadDataSourceNetworkForced(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadDataSourceNetworkForced), object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(deleteFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDeleteFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(moveFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterMoveFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(copyFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterCopyFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(renameFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterRenameFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(createFolder(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterCreateFolder), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(favoriteFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterFavoriteFile), object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(downloadStartFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadStartFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(downloadedFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadedFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(downloadCancelFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadCancelFile), object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(uploadStartFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterUploadStartFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(uploadedFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterUploadedFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(uploadCancelFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterUploadCancelFile), object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(triggerProgressTask(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterProgressTask), object: nil)

        if serverUrl == "" {
            appDelegate.activeServerUrl = NCUtilityFileSystem.shared.getHomeServer(account: appDelegate.account)
        } else {
            appDelegate.activeServerUrl = serverUrl
        }

        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.setNavigationBarHidden(false, animated: true)
        setNavigationItem()

        changeTheming()
        reloadDataSource()
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        reloadDataSourceNetwork()
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterCloseRichWorkspaceWebView), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterChangeStatusFolderE2EE), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadAvatar), object: nil)

        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadDataSource), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadDataSourceNetworkForced), object: nil)

        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDeleteFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterMoveFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterCopyFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterRenameFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterCreateFolder), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterFavoriteFile), object: nil)

        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadStartFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadedFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadCancelFile), object: nil)

        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterUploadStartFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterUploadedFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterUploadCancelFile), object: nil)

        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterProgressTask), object: nil)

        pushed = false
    }

    func presentationControllerDidDismiss( _ presentationController: UIPresentationController) {
        let viewController = presentationController.presentedViewController
        if viewController is NCViewerRichWorkspaceWebView {
            closeRichWorkspaceWebView()
        }
    }

    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size, with: coordinator)

        coordinator.animate(alongsideTransition: nil) { _ in
            self.collectionView?.collectionViewLayout.invalidateLayout()
        }
    }

    override var canBecomeFirstResponder: Bool {
        return true
    }

    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)

        changeTheming()
    }

    // MARK: - NotificationCenter

    @objc func initialize() {

        if appDelegate.account == "" { return }

        // Search
        if searchController?.isActive ?? false {
            searchController?.isActive = false
        }

        // Select
        if isEditMode {
            isEditMode = !isEditMode
            selectOcId.removeAll()
        }

        if self.view?.window != nil {
            if serverUrl == "" {
                appDelegate.activeServerUrl = NCUtilityFileSystem.shared.getHomeServer(account: appDelegate.account)
            } else {
                appDelegate.activeServerUrl = serverUrl
            }

            appDelegate.listFilesVC.removeAll()
            appDelegate.listFavoriteVC.removeAll()
            appDelegate.listOfflineVC.removeAll()
        }

        if serverUrl != "" {
            self.navigationController?.popToRootViewController(animated: false)
        }

        setNavigationItem()
        reloadDataSource()
        changeTheming()
    }

    @objc func changeTheming() {

        view.backgroundColor = NCBrandColor.shared.systemBackground
        collectionView.backgroundColor = NCBrandColor.shared.systemBackground
        refreshControl.tintColor = .gray

        layoutForView = NCUtility.shared.getLayoutForView(key: layoutKey, serverUrl: serverUrl)
        gridLayout.itemForLine = CGFloat(layoutForView?.itemForLine ?? 3)

        if layoutForView?.layout == NCGlobal.shared.layoutList {
            collectionView?.collectionViewLayout = listLayout
        } else {
            collectionView?.collectionViewLayout = gridLayout
        }

        // IMAGE BACKGROUND
        if layoutForView?.imageBackgroud != "" {
            let imagePath = CCUtility.getDirectoryGroup().appendingPathComponent(NCGlobal.shared.appBackground).path + "/" + layoutForView!.imageBackgroud
            do {
                let data = try Data(contentsOf: URL(fileURLWithPath: imagePath))
                if let image = UIImage(data: data) {
                    backgroundImageView.image = image
                    backgroundImageView.contentMode = .scaleToFill
                    collectionView.backgroundView = backgroundImageView
                }
            } catch { }
        } else {
            backgroundImageView.image = nil
            collectionView.backgroundView = nil
        }

        // COLOR BACKGROUND
        let activeAccount = NCManageDatabase.shared.getActiveAccount()
        if traitCollection.userInterfaceStyle == .dark {
            if activeAccount?.darkColorBackground != "" {
                collectionView.backgroundColor = UIColor(hex: activeAccount?.darkColorBackground ?? "")
            } else {
                collectionView.backgroundColor = NCBrandColor.shared.systemBackground
            }
        } else {
           if activeAccount?.lightColorBackground != "" {
                collectionView.backgroundColor = UIColor(hex: activeAccount?.lightColorBackground ?? "")
            } else {
                collectionView.backgroundColor = NCBrandColor.shared.systemBackground
            }
        }

        collectionView.reloadData()
    }

    @objc func reloadDataSource(_ notification: NSNotification) {

        reloadDataSource()
    }

    @objc func reloadDataSourceNetworkForced(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary? {
            if let serverUrl = userInfo["serverUrl"] as? String {
                if serverUrl == self.serverUrl {
                    reloadDataSourceNetwork(forced: true)
                }
            }
        } else {
            reloadDataSourceNetwork(forced: true)
        }
    }

    @objc func changeStatusFolderE2EE(_ notification: NSNotification) {
        reloadDataSource()
    }

    @objc func closeRichWorkspaceWebView() {
        reloadDataSourceNetwork()
    }

    @objc func deleteFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let fileNameView = userInfo["fileNameView"] as? String, let onlyLocalCache = userInfo["onlyLocalCache"] as? Bool {
            if onlyLocalCache {
                reloadDataSource()
            } else if fileNameView.lowercased() == NCGlobal.shared.fileNameRichWorkspace.lowercased() {
                reloadDataSourceNetwork(forced: true)
            } else {
                if let row = dataSource.deleteMetadata(ocId: ocId) {
                    let indexPath = IndexPath(row: row, section: 0)
                    collectionView?.performBatchUpdates({
                        collectionView?.deleteItems(at: [indexPath])
                    }, completion: { _ in
                        self.collectionView?.reloadData()
                    })
                }
            }
        }
    }

    @objc func moveFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let serverUrlFrom = userInfo["serverUrlFrom"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            // DEL
            if serverUrlFrom == serverUrl && metadata.account == appDelegate.account {
                if let row = dataSource.deleteMetadata(ocId: ocId) {
                    let indexPath = IndexPath(row: row, section: 0)
                    collectionView?.performBatchUpdates({
                        collectionView?.deleteItems(at: [indexPath])
                    }, completion: { _ in
                        self.collectionView?.reloadData()
                    })
                }
                // ADD
            } else if metadata.serverUrl == serverUrl && metadata.account == appDelegate.account {
                if let row = dataSource.addMetadata(metadata) {
                    let indexPath = IndexPath(row: row, section: 0)
                    collectionView?.performBatchUpdates({
                        collectionView?.insertItems(at: [indexPath])
                    }, completion: { _ in
                        self.collectionView?.reloadData()
                    })
                }
            }
        }
    }

    @objc func copyFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let serverUrlTo = userInfo["serverUrlTo"] as? String {
            if serverUrlTo == self.serverUrl {
                reloadDataSource()
            }
        }
    }

    @objc func renameFile(_ notification: NSNotification) {

        reloadDataSource()
    }

    @objc func createFolder(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            if metadata.serverUrl == serverUrl && metadata.account == appDelegate.account {
                pushMetadata(metadata)
            }
        } else {
            reloadDataSourceNetwork()
        }
    }

    @objc func favoriteFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            if dataSource.getIndexMetadata(ocId: metadata.ocId) != nil {
                reloadDataSource()
            }
        }
    }

    @objc func downloadStartFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            if let row = dataSource.reloadMetadata(ocId: metadata.ocId) {
                let indexPath = IndexPath(row: row, section: 0)
                if indexPath.section < collectionView.numberOfSections && indexPath.row < collectionView.numberOfItems(inSection: indexPath.section) {
                    collectionView?.reloadItems(at: [indexPath])
                }
            }
        }
    }

    @objc func downloadedFile(_ notification: NSNotification) {

        guard let userInfo = notification.userInfo as NSDictionary?,
              let ocId = userInfo["ocId"] as? String,
              let _ = userInfo["errorCode"] as? Int,
              let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId),
              let row = dataSource.reloadMetadata(ocId: metadata.ocId)
        else { return }
        let indexPath = IndexPath(row: row, section: 0)
        if indexPath.section < collectionView.numberOfSections && indexPath.row < collectionView.numberOfItems(inSection: indexPath.section) {
            collectionView?.reloadItems(at: [indexPath])
        }
    }

    @objc func downloadCancelFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            if let row = dataSource.reloadMetadata(ocId: metadata.ocId) {
                let indexPath = IndexPath(row: row, section: 0)
                if indexPath.section < collectionView.numberOfSections && indexPath.row < collectionView.numberOfItems(inSection: indexPath.section) {
                    collectionView?.reloadItems(at: [indexPath])
                }
            }
        }
    }

    @objc func uploadStartFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            if metadata.serverUrl == serverUrl && metadata.account == appDelegate.account {
                dataSource.addMetadata(metadata)
                self.collectionView?.reloadData()
            }
        }
    }

    @objc func uploadedFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let ocIdTemp = userInfo["ocIdTemp"] as? String, let _ = userInfo["errorCode"] as? Int, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
            if metadata.serverUrl == serverUrl && metadata.account == appDelegate.account {
                dataSource.reloadMetadata(ocId: metadata.ocId, ocIdTemp: ocIdTemp)
                collectionView?.reloadData()
            }
        }
    }

    @objc func uploadCancelFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, let serverUrl = userInfo["serverUrl"] as? String, let account = userInfo["account"] as? String {

            if serverUrl == self.serverUrl && account == appDelegate.account {
                if let row = dataSource.deleteMetadata(ocId: ocId) {
                    let indexPath = IndexPath(row: row, section: 0)
                    collectionView?.performBatchUpdates({
                        if indexPath.section < (collectionView?.numberOfSections ?? 0) && indexPath.row < (collectionView?.numberOfItems(inSection: indexPath.section) ?? 0) {
                            collectionView?.deleteItems(at: [indexPath])
                        }
                    }, completion: { _ in
                        self.collectionView?.reloadData()
                    })
                } else {
                    self.reloadDataSource()
                }
            }
        }
    }

    @objc func triggerProgressTask(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary?, let progressNumber = userInfo["progress"] as? NSNumber, let totalBytes = userInfo["totalBytes"] as? Int64, let totalBytesExpected = userInfo["totalBytesExpected"] as? Int64, let ocId = userInfo["ocId"] as? String {

            let status = userInfo["status"] as? Int ?? NCGlobal.shared.metadataStatusNormal

            if let index = dataSource.getIndexMetadata(ocId: ocId) {
                if let cell = collectionView?.cellForItem(at: IndexPath(row: index, section: 0)) {
                    if cell is NCListCell {
                        let cell = cell as! NCListCell
                        if progressNumber.floatValue == 1 {
                            cell.progressView?.isHidden = true
                            cell.progressView?.progress = .zero
                            cell.setButtonMore(named: NCGlobal.shared.buttonMoreMore, image: NCBrandColor.cacheImages.buttonMore)
                            if let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {
                                cell.labelInfo.text = CCUtility.dateDiff(metadata.date as Date) + " · " + CCUtility.transformedSize(metadata.size)
                            } else {
                                cell.labelInfo.text = ""
                            }
                        } else if progressNumber.floatValue > 0 {
                            cell.progressView?.isHidden = false
                            cell.progressView?.progress = progressNumber.floatValue
                            cell.setButtonMore(named: NCGlobal.shared.buttonMoreStop, image: NCBrandColor.cacheImages.buttonStop)
                            if status == NCGlobal.shared.metadataStatusInDownload {
                                cell.labelInfo.text = CCUtility.transformedSize(totalBytesExpected) + " - ↓ " + CCUtility.transformedSize(totalBytes)
                            } else if status == NCGlobal.shared.metadataStatusInUpload {
                                cell.labelInfo.text = CCUtility.transformedSize(totalBytesExpected) + " - ↑ " + CCUtility.transformedSize(totalBytes)
                            }
                        }
                    } else if cell is NCTransferCell {
                        let cell = cell as! NCTransferCell
                        if progressNumber.floatValue == 1 {
                            cell.progressView?.isHidden = true
                            cell.progressView?.progress = .zero
                            cell.buttonMore.isHidden = true
                            cell.labelInfo.text = ""
                        } else if progressNumber.floatValue > 0 {
                            cell.progressView?.isHidden = false
                            cell.progressView?.progress = progressNumber.floatValue
                            cell.setButtonMore(named: NCGlobal.shared.buttonMoreStop, image: NCBrandColor.cacheImages.buttonStop)
                            if status == NCGlobal.shared.metadataStatusInDownload {
                                cell.labelInfo.text = CCUtility.transformedSize(totalBytesExpected) + " - ↓ " + CCUtility.transformedSize(totalBytes)
                            } else if status == NCGlobal.shared.metadataStatusInUpload {
                                cell.labelInfo.text = CCUtility.transformedSize(totalBytesExpected) + " - ↑ " + CCUtility.transformedSize(totalBytes)
                            }
                        }
                    } else if cell is NCGridCell {
                        let cell = cell as! NCGridCell
                        if progressNumber.floatValue == 1 {
                            cell.progressView.isHidden = true
                            cell.progressView.progress = .zero
                            cell.setButtonMore(named: NCGlobal.shared.buttonMoreMore, image: NCBrandColor.cacheImages.buttonMore)
                        } else if progressNumber.floatValue > 0 {
                            cell.progressView.isHidden = false
                            cell.progressView.progress = progressNumber.floatValue
                            cell.setButtonMore(named: NCGlobal.shared.buttonMoreStop, image: NCBrandColor.cacheImages.buttonStop)
                        }
                    }
                }
            }
        }
    }

    // MARK: - Layout

    @objc func setNavigationItem() {
        self.setNavigationHeader()
        guard !isEditMode, layoutKey == NCGlobal.shared.layoutViewFiles else { return }
        
        // PROFILE BUTTON
        
        let activeAccount = NCManageDatabase.shared.getActiveAccount()
        
        let image = NCUtility.shared.loadUserImage(
            for: appDelegate.user,
               displayName: activeAccount?.displayName,
               userBaseUrl: appDelegate)
        
        let button = UIButton(type: .custom)
        button.setImage(image, for: .normal)
        
        if serverUrl == NCUtilityFileSystem.shared.getHomeServer(account: appDelegate.account) {
            
            var titleButton = "  "
            
            if getNavigationTitle() == activeAccount?.alias {
                titleButton = ""
            } else {
                titleButton += activeAccount?.displayName ?? ""
            }
            
            button.setTitle(titleButton, for: .normal)
            button.setTitleColor(.systemBlue, for: .normal)
        }
        
        button.semanticContentAttribute = .forceLeftToRight
        button.sizeToFit()
        button.action(for: .touchUpInside) { _ in
            
            let accounts = NCManageDatabase.shared.getAllAccountOrderAlias()
            if accounts.count > 0 && !NCBrandOptions.shared.disable_multiaccount && !NCBrandOptions.shared.disable_manage_account {
                
                if let vcAccountRequest = UIStoryboard(name: "NCAccountRequest", bundle: nil).instantiateInitialViewController() as? NCAccountRequest {
                    
                    vcAccountRequest.activeAccount = NCManageDatabase.shared.getActiveAccount()
                    vcAccountRequest.accounts = accounts
                    vcAccountRequest.enableTimerProgress = false
                    vcAccountRequest.enableAddAccount = true
                    vcAccountRequest.delegate = self
                    vcAccountRequest.dismissDidEnterBackground = true
                    
                    let screenHeighMax = UIScreen.main.bounds.height - (UIScreen.main.bounds.height/5)
                    let numberCell = accounts.count + 1
                    let height = min(CGFloat(numberCell * Int(vcAccountRequest.heightCell) + 45), screenHeighMax)
                    
                    let popup = NCPopupViewController(contentController: vcAccountRequest, popupWidth: 300, popupHeight: height)
                    
                    UIApplication.shared.keyWindow?.rootViewController?.present(popup, animated: true)
                }
            }
        }
        navigationItem.setLeftBarButton(UIBarButtonItem(customView: button), animated: true)
        navigationItem.leftItemsSupplementBackButton = true
    }

    func getNavigationTitle() -> String {
        let activeAccount = NCManageDatabase.shared.getActiveAccount()
        guard let userAlias = activeAccount?.alias, !userAlias.isEmpty else {
            return NCBrandOptions.shared.brand
        }
        return userAlias
    }

    // MARK: - BackgroundImageColor Delegate

    func colorPickerCancel() {
        changeTheming()
    }

    func colorPickerWillChange(color: UIColor) {
        collectionView.backgroundColor = color
    }

    func colorPickerDidChange(lightColor: String, darkColor: String) {

        NCManageDatabase.shared.setAccountColorFiles(lightColorBackground: lightColor, darkColorBackground: darkColor)

        changeTheming()
    }

    // MARK: - Empty

    func emptyDataSetView(_ view: NCEmptyView) {

        if searchController?.isActive ?? false {
            view.emptyImage.image = UIImage(named: "search")?.image(color: .gray, size: UIScreen.main.bounds.width)
            if isReloadDataSourceNetworkInProgress {
                view.emptyTitle.text = NSLocalizedString("_search_in_progress_", comment: "")
            } else {
                view.emptyTitle.text = NSLocalizedString("_search_no_record_found_", comment: "")
            }
            view.emptyDescription.text = NSLocalizedString("_search_instruction_", comment: "")
        } else if isReloadDataSourceNetworkInProgress {
            view.emptyImage.image = UIImage(named: "networkInProgress")?.image(color: .gray, size: UIScreen.main.bounds.width)
            view.emptyTitle.text = NSLocalizedString("_request_in_progress_", comment: "")
            view.emptyDescription.text = ""
        } else {
            if serverUrl == "" {
                view.emptyImage.image = emptyImage
                view.emptyTitle.text = NSLocalizedString(emptyTitle, comment: "")
                view.emptyDescription.text = NSLocalizedString(emptyDescription, comment: "")
            } else {
                view.emptyImage.image = UIImage(named: "folder")?.image(color: NCBrandColor.shared.brandElement, size: UIScreen.main.bounds.width)
                view.emptyTitle.text = NSLocalizedString("_files_no_files_", comment: "")
                view.emptyDescription.text = NSLocalizedString("_no_file_pull_down_", comment: "")
            }
        }
    }

    // MARK: - SEARCH

    func updateSearchResults(for searchController: UISearchController) {

        timerInputSearch?.invalidate()
        timerInputSearch = Timer.scheduledTimer(timeInterval: 1.5, target: self, selector: #selector(reloadDataSourceNetwork), userInfo: nil, repeats: false)
        literalSearch = searchController.searchBar.text
        collectionView?.reloadData()
    }

    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {

        isSearching = true
        metadatasSource.removeAll()
        reloadDataSource()
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {

        isSearching = false
        literalSearch = ""
        reloadDataSource()
    }

    // MARK: - TAP EVENT

    func accountRequestChangeAccount(account: String) {
        NCManageDatabase.shared.setAccountActive(account)
        if let activeAccount = NCManageDatabase.shared.getActiveAccount() {

            NCOperationQueue.shared.cancelAllQueue()
            NCNetworking.shared.cancelAllTask()

            appDelegate.settingAccount(activeAccount.account, urlBase: activeAccount.urlBase, user: activeAccount.user, userId: activeAccount.userId, password: CCUtility.getPassword(activeAccount.account))

            NotificationCenter.default.postOnMainThread(name: NCGlobal.shared.notificationCenterInitialize)
        }
    }

    func accountRequestAddAccount() {
        appDelegate.openLogin(viewController: self, selector: NCGlobal.shared.introLogin, openLoginWeb: false)
    }

    func tapSwitchHeader(sender: Any) {

        if collectionView.collectionViewLayout == gridLayout {
            // list layout
            header?.buttonSwitch.accessibilityLabel = NSLocalizedString("_grid_view_", comment: "")
            UIView.animate(withDuration: 0.0, animations: {
                self.collectionView.collectionViewLayout.invalidateLayout()
                self.collectionView.setCollectionViewLayout(self.listLayout, animated: false, completion: { _ in
                    self.collectionView.reloadData()
                })
            })
            layoutForView?.layout = NCGlobal.shared.layoutList
            NCUtility.shared.setLayoutForView(key: layoutKey, serverUrl: serverUrl, layout: layoutForView?.layout)
        } else {
            // grid layout
            header?.buttonSwitch.accessibilityLabel = NSLocalizedString("_list_view_", comment: "")
            UIView.animate(withDuration: 0.0, animations: {
                self.collectionView.collectionViewLayout.invalidateLayout()
                self.collectionView.setCollectionViewLayout(self.gridLayout, animated: false, completion: { _ in
                    self.collectionView.reloadData()
                })
            })
            layoutForView?.layout = NCGlobal.shared.layoutGrid
            NCUtility.shared.setLayoutForView(key: layoutKey, serverUrl: serverUrl, layout: layoutForView?.layout)
        }
    }

    func tapOrderHeader(sender: Any) {

        let sortMenu = NCSortMenu()
        sortMenu.toggleMenu(viewController: self, key: layoutKey, sortButton: sender as? UIButton, serverUrl: serverUrl)
    }

    func tapMoreHeader(sender: Any) { }

    func tapMoreListItem(with objectId: String, namedButtonMore: String, image: UIImage?, sender: Any) {

        tapMoreGridItem(with: objectId, namedButtonMore: namedButtonMore, image: image, sender: sender)
    }

    func tapShareListItem(with objectId: String, sender: Any) {

        if isEditMode { return }
        guard let metadata = NCManageDatabase.shared.getMetadataFromOcId(objectId) else { return }

        NCFunctionCenter.shared.openShare(viewController: self, metadata: metadata, indexPage: .sharing)
    }

    func tapMoreGridItem(with objectId: String, namedButtonMore: String, image: UIImage?, sender: Any) {

        if isEditMode { return }

        guard let metadata = NCManageDatabase.shared.getMetadataFromOcId(objectId) else { return }

        if namedButtonMore == NCGlobal.shared.buttonMoreMore || namedButtonMore == NCGlobal.shared.buttonMoreLock {
            toggleMenu(metadata: metadata, imageIcon: image)
        } else if namedButtonMore == NCGlobal.shared.buttonMoreStop {
            NCNetworking.shared.cancelTransferMetadata(metadata) { }
        }
    }

    func tapRichWorkspace(sender: Any) {

        if let navigationController = UIStoryboard(name: "NCViewerRichWorkspace", bundle: nil).instantiateInitialViewController() as? UINavigationController {
            if let viewerRichWorkspace = navigationController.topViewController as? NCViewerRichWorkspace {
                viewerRichWorkspace.richWorkspaceText = richWorkspaceText ?? ""
                viewerRichWorkspace.serverUrl = serverUrl

                navigationController.modalPresentationStyle = .fullScreen
                self.present(navigationController, animated: true, completion: nil)
            }
        }
    }

    func longPressListItem(with objectId: String, gestureRecognizer: UILongPressGestureRecognizer) {
    }

    func longPressGridItem(with objectId: String, gestureRecognizer: UILongPressGestureRecognizer) {
    }

    func longPressMoreListItem(with objectId: String, namedButtonMore: String, gestureRecognizer: UILongPressGestureRecognizer) {
    }

    func longPressMoreGridItem(with objectId: String, namedButtonMore: String, gestureRecognizer: UILongPressGestureRecognizer) {
    }

    @objc func longPressCollecationView(_ gestureRecognizer: UILongPressGestureRecognizer) {

        openMenuItems(with: nil, gestureRecognizer: gestureRecognizer)
        /*
        if #available(iOS 13.0, *) {
            
            let interaction = UIContextMenuInteraction(delegate: self)
            self.view.addInteraction(interaction)
        }
        */
    }

    @available(iOS 13.0, *)
    func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {

        return UIContextMenuConfiguration(identifier: nil, previewProvider: {

            return nil

        }, actionProvider: { _ in

            // let share = UIAction(title: "Share Pupper", image: UIImage(systemName: "square.and.arrow.up")) { action in
            // }
            // return UIMenu(title: "Main Menu", children: [share])
            return nil
        })
    }

    func openMenuItems(with objectId: String?, gestureRecognizer: UILongPressGestureRecognizer) {

        if gestureRecognizer.state != .began { return }

        var listMenuItems: [UIMenuItem] = []
        let touchPoint = gestureRecognizer.location(in: collectionView)

        becomeFirstResponder()

        if serverUrl != "" {
            listMenuItems.append(UIMenuItem(title: NSLocalizedString("_paste_file_", comment: ""), action: #selector(pasteFilesMenu)))
        }
        if #available(iOS 13.0, *) {
            if !NCBrandOptions.shared.disable_background_color {
                listMenuItems.append(UIMenuItem(title: NSLocalizedString("_background_", comment: ""), action: #selector(backgroundFilesMenu)))
            }
        }

        if listMenuItems.count > 0 {
            UIMenuController.shared.menuItems = listMenuItems
            UIMenuController.shared.setTargetRect(CGRect(x: touchPoint.x, y: touchPoint.y, width: 0, height: 0), in: collectionView)
            UIMenuController.shared.setMenuVisible(true, animated: true)
        }
    }

    // MARK: - Menu Item

    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

        if #selector(pasteFilesMenu) == action {
            if UIPasteboard.general.items.count > 0 {
                return true
            }
        }

        if #selector(backgroundFilesMenu) == action {
            return true
        }

        return false
    }

    @objc func pasteFilesMenu() {
        NCFunctionCenter.shared.pastePasteboard(serverUrl: serverUrl)
    }

    @objc func backgroundFilesMenu() {

        if let vcBackgroundImageColor = UIStoryboard(name: "NCBackgroundImageColor", bundle: nil).instantiateInitialViewController() as? NCBackgroundImageColor {

            vcBackgroundImageColor.delegate = self
            vcBackgroundImageColor.setupColor = collectionView.backgroundColor
            if let activeAccount = NCManageDatabase.shared.getActiveAccount() {
                vcBackgroundImageColor.lightColor = activeAccount.lightColorBackground
                vcBackgroundImageColor.darkColor = activeAccount.darkColorBackground
            }

            let popup = NCPopupViewController(contentController: vcBackgroundImageColor, popupWidth: vcBackgroundImageColor.width, popupHeight: vcBackgroundImageColor.height)
            popup.backgroundAlpha = 0

            self.present(popup, animated: true)
        }
    }

    // MARK: - DataSource + NC Endpoint

    @objc func reloadDataSource() {

        if appDelegate.account == "" { return }

        // Get richWorkspace Text
        let directory = NCManageDatabase.shared.getTableDirectory(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@", appDelegate.account, serverUrl))
        richWorkspaceText = directory?.richWorkspace

        // E2EE
        isEncryptedFolder = CCUtility.isFolderEncrypted(serverUrl, e2eEncrypted: metadataFolder?.e2eEncrypted ?? false, account: appDelegate.account, urlBase: appDelegate.urlBase)

        // get auto upload folder
        autoUploadFileName = NCManageDatabase.shared.getAccountAutoUploadFileName()
        autoUploadDirectory = NCManageDatabase.shared.getAccountAutoUploadDirectory(urlBase: appDelegate.urlBase, account: appDelegate.account)

        // get layout for view
        layoutForView = NCUtility.shared.getLayoutForView(key: layoutKey, serverUrl: serverUrl)
    }

    @objc func reloadDataSourceNetwork(forced: Bool = false) { }

    @objc func networkSearch() {

        if appDelegate.account == "" { return }

        if literalSearch?.count ?? 0 > 1 {

            isReloadDataSourceNetworkInProgress = true
            collectionView?.reloadData()

            NCNetworking.shared.searchFiles(urlBase: appDelegate.urlBase, user: appDelegate.user, literal: literalSearch!) { _, metadatas, errorCode, _ in

                DispatchQueue.main.async {
                    if self.searchController?.isActive ?? false && errorCode == 0 {
                        self.metadatasSource = metadatas!
                    }
                    self.refreshControl.endRefreshing()
                    self.isReloadDataSourceNetworkInProgress = false
                    self.reloadDataSource()
                }
            }
        } else {
            self.refreshControl.endRefreshing()
        }
    }

    @objc func networkReadFolder(forced: Bool, completion: @escaping(_ tableDirectory: tableDirectory?, _ metadatas: [tableMetadata]?, _ metadatasUpdate: [tableMetadata]?, _ metadatasDelete: [tableMetadata]?, _ errorCode: Int, _ errorDescription: String) -> Void) {

        var tableDirectory: tableDirectory?

        NCNetworking.shared.readFile(serverUrlFileName: serverUrl, account: appDelegate.account) { account, metadataFolder, errorCode, errorDescription in

            if errorCode == 0 {

                if let metadataFolder = metadataFolder {
                    tableDirectory = NCManageDatabase.shared.setDirectory(richWorkspace: metadataFolder.richWorkspace, serverUrl: self.serverUrl, account: account)
                }

                if forced || tableDirectory?.etag != metadataFolder?.etag || metadataFolder?.e2eEncrypted ?? false {

                    NCNetworking.shared.readFolder(serverUrl: self.serverUrl, account: self.appDelegate.account) { account, metadataFolder, metadatas, metadatasUpdate, _, metadatasDelete, errorCode, errorDescription in

                        if errorCode == 0 {
                            self.metadataFolder = metadataFolder

                            // E2EE
                            if let metadataFolder = metadataFolder {
                                if metadataFolder.e2eEncrypted && CCUtility.isEnd(toEndEnabled: self.appDelegate.account) {

                                    NCCommunication.shared.getE2EEMetadata(fileId: metadataFolder.ocId, e2eToken: nil) { account, e2eMetadata, errorCode, errorDescription in

                                        if errorCode == 0 && e2eMetadata != nil {

                                            if !NCEndToEndMetadata.shared.decoderMetadata(e2eMetadata!, privateKey: CCUtility.getEndToEndPrivateKey(account), serverUrl: self.serverUrl, account: account, urlBase: self.appDelegate.urlBase) {

                                                NCContentPresenter.shared.messageNotification("_error_e2ee_", description: "_e2e_error_decode_metadata_", delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.error, errorCode: NCGlobal.shared.errorDecodeMetadata)
                                            } else {
                                                self.reloadDataSource()
                                            }

                                        } else if errorCode != NCGlobal.shared.errorResourceNotFound {

                                            NCContentPresenter.shared.messageNotification("_error_e2ee_", description: "_e2e_error_decode_metadata_", delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.error, errorCode: NCGlobal.shared.errorDecodeMetadata)
                                        }

                                        completion(tableDirectory, metadatas, metadatasUpdate, metadatasDelete, errorCode, errorDescription)
                                    }
                                } else {
                                    completion(tableDirectory, metadatas, metadatasUpdate, metadatasDelete, errorCode, errorDescription)
                                }
                            } else {
                                completion(tableDirectory, metadatas, metadatasUpdate, metadatasDelete, errorCode, errorDescription)
                            }
                        } else {
                            completion(tableDirectory, nil, nil, nil, errorCode, errorDescription)
                        }
                    }
                } else {
                    completion(tableDirectory, nil, nil, nil, 0, "")
                }
            } else {
               completion(nil, nil, nil, nil, errorCode, errorDescription)
            }
        }
    }

    // MARK: - Push metadata

    func pushMetadata(_ metadata: tableMetadata) {

        guard let serverUrlPush = CCUtility.stringAppendServerUrl(metadata.serverUrl, addFileName: metadata.fileName) else { return }
        appDelegate.activeMetadata = metadata

        // FILES
        if layoutKey == NCGlobal.shared.layoutViewFiles && !pushed {

            if let viewController = appDelegate.listFilesVC[serverUrlPush] {

                if viewController.isViewLoaded {
                    pushViewController(viewController: viewController)
                }

            } else {

                if let viewController: NCFiles = UIStoryboard(name: "NCFiles", bundle: nil).instantiateInitialViewController() as? NCFiles {

                    viewController.isRoot = false
                    viewController.serverUrl = serverUrlPush
                    viewController.titleCurrentFolder = metadata.fileNameView

                    appDelegate.listFilesVC[serverUrlPush] = viewController

                    pushViewController(viewController: viewController)
                }
            }
        }

        // FAVORITE
        if layoutKey == NCGlobal.shared.layoutViewFavorite && !pushed {

            if let viewController = appDelegate.listFavoriteVC[serverUrlPush] {

                if viewController.isViewLoaded {
                    pushViewController(viewController: viewController)
                }

            } else {

                if let viewController: NCFavorite = UIStoryboard(name: "NCFavorite", bundle: nil).instantiateInitialViewController() as? NCFavorite {

                    viewController.serverUrl = serverUrlPush
                    viewController.titleCurrentFolder = metadata.fileNameView

                    appDelegate.listFavoriteVC[serverUrlPush] = viewController

                    pushViewController(viewController: viewController)
                }
            }
        }

        // OFFLINE
        if layoutKey == NCGlobal.shared.layoutViewOffline && !pushed {

            if let viewController = appDelegate.listOfflineVC[serverUrlPush] {

                if viewController.isViewLoaded {
                    pushViewController(viewController: viewController)
                }

            } else {

                if let viewController: NCOffline = UIStoryboard(name: "NCOffline", bundle: nil).instantiateInitialViewController() as? NCOffline {

                    viewController.serverUrl = serverUrlPush
                    viewController.titleCurrentFolder = metadata.fileNameView

                    appDelegate.listOfflineVC[serverUrlPush] = viewController

                    pushViewController(viewController: viewController)
                }
            }
        }

        // RECENT ( for push use Files ... he he he )
        if layoutKey == NCGlobal.shared.layoutViewRecent && !pushed {

            if let viewController = appDelegate.listFilesVC[serverUrlPush] {

                if viewController.isViewLoaded {
                    pushViewController(viewController: viewController)
                }

            } else {

                if let viewController: NCFiles = UIStoryboard(name: "NCFiles", bundle: nil).instantiateInitialViewController() as? NCFiles {

                    viewController.isRoot = false
                    viewController.serverUrl = serverUrlPush
                    viewController.titleCurrentFolder = metadata.fileNameView

                    appDelegate.listFilesVC[serverUrlPush] = viewController

                    pushViewController(viewController: viewController)
                }
            }
        }

        // VIEW IN FOLDER
        if layoutKey == NCGlobal.shared.layoutViewViewInFolder && !pushed {

            if let viewController: NCFileViewInFolder = UIStoryboard(name: "NCFileViewInFolder", bundle: nil).instantiateInitialViewController() as? NCFileViewInFolder {

                viewController.serverUrl = serverUrlPush
                viewController.titleCurrentFolder = metadata.fileNameView

                pushViewController(viewController: viewController)
            }
        }

        // SHARES ( for push use Files ... he he he )
        if layoutKey == NCGlobal.shared.layoutViewShares && !pushed {

            if let viewController = appDelegate.listFilesVC[serverUrlPush] {

                if viewController.isViewLoaded {
                    pushViewController(viewController: viewController)
                }

            } else {

                if let viewController: NCFiles = UIStoryboard(name: "NCFiles", bundle: nil).instantiateInitialViewController() as? NCFiles {

                    viewController.isRoot = false
                    viewController.serverUrl = serverUrlPush
                    viewController.titleCurrentFolder = metadata.fileNameView

                    appDelegate.listFilesVC[serverUrlPush] = viewController

                    pushViewController(viewController: viewController)
                }
            }
        }
    }
}

// MARK: - Collection View

extension NCCollectionViewCommon: UICollectionViewDelegate {

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

        guard let metadata = dataSource.cellForItemAt(indexPath: indexPath) else { return }
        appDelegate.activeMetadata = metadata

        if isEditMode {
            if let index = selectOcId.firstIndex(of: metadata.ocId) {
                selectOcId.remove(at: index)
            } else {
                selectOcId.append(metadata.ocId)
            }
            collectionView.reloadItems(at: [indexPath])
            self.navigationItem.title = NSLocalizedString("_selected_", comment: "") + " : \(selectOcId.count)" + " / \(dataSource.metadatas.count)"
            return
        }

        if metadata.e2eEncrypted && !CCUtility.isEnd(toEndEnabled: appDelegate.account) {
            NCContentPresenter.shared.messageNotification("_info_", description: "_e2e_goto_settings_for_enable_", delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.info, errorCode: NCGlobal.shared.errorE2EENotEnabled)
            return
        }

        if metadata.directory {

            pushMetadata(metadata)
            
        } else if !(self is NCFileViewInFolder) {
            
            let imageIcon = UIImage(contentsOfFile: CCUtility.getDirectoryProviderStorageIconOcId(metadata.ocId, etag: metadata.etag))

            if metadata.classFile == NCCommunicationCommon.typeClassFile.image.rawValue || metadata.classFile == NCCommunicationCommon.typeClassFile.video.rawValue || metadata.classFile == NCCommunicationCommon.typeClassFile.audio.rawValue {
                var metadatas: [tableMetadata] = []
                for metadata in dataSource.metadatas {
                    if metadata.classFile == NCCommunicationCommon.typeClassFile.image.rawValue || metadata.classFile == NCCommunicationCommon.typeClassFile.video.rawValue || metadata.classFile == NCCommunicationCommon.typeClassFile.audio.rawValue {
                        metadatas.append(metadata)
                    }
                }
                NCViewer.shared.view(viewController: self, metadata: metadata, metadatas: metadatas, imageIcon: imageIcon)
                return
            }

            if CCUtility.fileProviderStorageExists(metadata) {
                NCViewer.shared.view(viewController: self, metadata: metadata, metadatas: [metadata], imageIcon: imageIcon)
            } else if NCCommunication.shared.isNetworkReachable() {
                NCNetworking.shared.download(metadata: metadata, selector: NCGlobal.shared.selectorLoadFileView) { _ in }
            } else {
                NCContentPresenter.shared.messageNotification("_info_", description: "_go_online_", delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.info, errorCode: NCGlobal.shared.errorOffline)
            }
        }
    }

    func pushViewController(viewController: UIViewController) {
        if pushed { return }

        pushed = true
        navigationController?.pushViewController(viewController, animated: true)
    }

    @available(iOS 13.0, *)
    func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {

        if isEditMode { return nil }
        guard let metadata = dataSource.cellForItemAt(indexPath: indexPath) else { return nil }
        let identifier = indexPath as NSCopying
        var image: UIImage?
        let cell = collectionView.cellForItem(at: indexPath)
        if cell is NCListCell {
            image = (cell as! NCListCell).imageItem.image
        } else if cell is NCGridCell {
            image = (cell as! NCGridCell).imageItem.image
        }

        return UIContextMenuConfiguration(identifier: identifier, previewProvider: {

            return NCViewerProviderContextMenu(metadata: metadata, image: image)

        }, actionProvider: { _ in

            return NCFunctionCenter.shared.contextMenuConfiguration(ocId: metadata.ocId, viewController: self, enableDeleteLocal: true, enableViewInFolder: false, image: image)
        })
    }

    @available(iOS 13.0, *)
    func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
        animator.addCompletion {

            if let indexPath = configuration.identifier as? IndexPath {
                self.collectionView(collectionView, didSelectItemAt: indexPath)
            }
        }
    }
}

extension NCCollectionViewCommon: UICollectionViewDataSource {

    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

        if kind == UICollectionView.elementKindSectionHeader {

            let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "sectionHeaderMenu", for: indexPath) as! NCSectionHeaderMenu
            self.header = header

            if collectionView.collectionViewLayout == gridLayout {
                header.buttonSwitch.setImage(UIImage(named: "switchList")!.image(color: NCBrandColor.shared.gray, size: 50), for: .normal)
                header.buttonSwitch.accessibilityLabel = NSLocalizedString("_list_view_", comment: "")
            } else {
                header.buttonSwitch.setImage(UIImage(named: "switchGrid")!.image(color: NCBrandColor.shared.gray, size: 50), for: .normal)
                header.buttonSwitch.accessibilityLabel = NSLocalizedString("_grid_view_", comment: "")
            }

            header.delegate = self
            header.setStatusButton(count: dataSource.metadatas.count)
            header.setTitleSorted(datasourceTitleButton: layoutForView?.titleButtonHeader ?? "")
            header.viewRichWorkspaceHeightConstraint.constant = headerRichWorkspaceHeight
            header.setRichWorkspaceText(richWorkspaceText: richWorkspaceText)

            return header

        } else {

            let footer = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "sectionFooter", for: indexPath) as! NCSectionFooter

            let info = dataSource.getFilesInformation()
            footer.setTitleLabel(directories: info.directories, files: info.files, size: info.size )

            return footer
        }
    }

    func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
        guard let metadata = dataSource.cellForItemAt(indexPath: indexPath) else { return }

        // Thumbnail
        if !metadata.directory {
            if FileManager().fileExists(atPath: CCUtility.getDirectoryProviderStorageIconOcId(metadata.ocId, etag: metadata.etag)) {
                (cell as! NCCellProtocol).filePreviewImageView?.image =  UIImage(contentsOfFile: CCUtility.getDirectoryProviderStorageIconOcId(metadata.ocId, etag: metadata.etag))
            } else {
                NCOperationQueue.shared.downloadThumbnail(metadata: metadata, placeholder: true, cell: cell, view: collectionView)
            }
        }

        // Avatar
        if metadata.ownerId.count > 0,
           metadata.ownerId != appDelegate.userId,
           appDelegate.account == metadata.account,
           let cell = cell as? NCCellProtocol {
            let fileName = metadata.userBaseUrl + "-" + metadata.ownerId + ".png"
            NCOperationQueue.shared.downloadAvatar(user: metadata.ownerId, dispalyName: metadata.ownerDisplayName, fileName: fileName, cell: cell, view: collectionView)
        }
    }

    func collectionView(_ collectionView: UICollectionView, didEndDisplaying cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {

    }

    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        let numberItems = dataSource.numberOfItems()
        emptyDataSet?.numberOfItemsInSection(numberItems, section: section)
        return numberItems
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        guard let metadata = dataSource.cellForItemAt(indexPath: indexPath) else {
            if layoutForView?.layout == NCGlobal.shared.layoutList {
                return collectionView.dequeueReusableCell(withReuseIdentifier: "listCell", for: indexPath) as! NCListCell
            } else {
                return collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath) as! NCGridCell
            }
        }

        var tableShare: tableShare?
        var isShare = false
        var isMounted = false

        if metadataFolder != nil {
            isShare = metadata.permissions.contains(NCGlobal.shared.permissionShared) && !metadataFolder!.permissions.contains(NCGlobal.shared.permissionShared)
            isMounted = metadata.permissions.contains(NCGlobal.shared.permissionMounted) && !metadataFolder!.permissions.contains(NCGlobal.shared.permissionMounted)
        }

        if dataSource.metadataShare[metadata.ocId] != nil {
            tableShare = dataSource.metadataShare[metadata.ocId]
        }

        //
        // LAYOUT LIST
        //
        if layoutForView?.layout == NCGlobal.shared.layoutList {

            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "listCell", for: indexPath) as! NCListCell
            cell.delegate = self

            cell.fileObjectId = metadata.ocId
            cell.fileUser = metadata.ownerId
            if isSearching {
                cell.labelTitle.text = NCUtilityFileSystem.shared.getPath(metadata: metadata)
                cell.labelTitle.lineBreakMode = .byTruncatingHead
            } else {
                cell.labelTitle.text = metadata.fileNameView
                cell.labelTitle.lineBreakMode = .byTruncatingMiddle

            }
            cell.labelTitle.textColor = NCBrandColor.shared.label
            cell.labelInfo.text = CCUtility.dateDiff(metadata.date as Date) + " · " + CCUtility.transformedSize(metadata.size)
            cell.labelInfo.textColor = NCBrandColor.shared.systemGray

            cell.imageSelect.image = nil
            cell.imageStatus.image = nil
            cell.imageLocal.image = nil
            cell.imageFavorite.image = nil
            cell.imageShared.image = nil
            cell.imageMore.image = nil

            cell.imageItem.image = nil
            cell.imageItem.backgroundColor = nil

            // Progress
            var progress: Float = 0.0
            var totalBytes: Int64 = 0
            if let progressType = appDelegate.listProgress[metadata.ocId] {
                progress = progressType.progress
                totalBytes = progressType.totalBytes
            }

            if metadata.status == NCGlobal.shared.metadataStatusDownloading || metadata.status == NCGlobal.shared.metadataStatusUploading {
                cell.progressView.isHidden = false
                cell.progressView.progress = progress
            } else {
                cell.progressView.isHidden = true
                cell.progressView.progress = 0.0
            }

            var a11yValues: [String] = []
            if metadata.ownerId != appDelegate.userId, appDelegate.account == metadata.account {
                a11yValues.append(NSLocalizedString("_shared_with_you_by_", comment: "") + " " + metadata.ownerDisplayName)
            }

            if metadata.directory {

                if metadata.e2eEncrypted {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderEncrypted
                } else if isShare {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderSharedWithMe
                } else if tableShare != nil && tableShare?.shareType != 3 {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderSharedWithMe
                } else if tableShare != nil && tableShare?.shareType == 3 {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderPublic
                } else if metadata.mountType == "group" {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderGroup
                } else if isMounted {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderExternal
                } else if metadata.fileName == autoUploadFileName && metadata.serverUrl == autoUploadDirectory {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderAutomaticUpload
                } else {
                    cell.imageItem.image = NCBrandColor.cacheImages.folder
                }

                let lockServerUrl = CCUtility.stringAppendServerUrl(metadata.serverUrl, addFileName: metadata.fileName)!
                let tableDirectory = NCManageDatabase.shared.getTableDirectory(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@", appDelegate.account, lockServerUrl))

                // Local image: offline
                if tableDirectory != nil && tableDirectory!.offline {
                    cell.imageLocal.image = NCBrandColor.cacheImages.offlineFlag
                }

            } else {

                // image local
                if dataSource.metadataOffLine.contains(metadata.ocId) {
                    a11yValues.append(NSLocalizedString("_offline_", comment: ""))
                    cell.imageLocal.image = NCBrandColor.cacheImages.offlineFlag
                } else if CCUtility.fileProviderStorageExists(metadata) {
                    cell.imageLocal.image = NCBrandColor.cacheImages.local
                }
            }

            // image Favorite
            if metadata.favorite {
                cell.imageFavorite.image = NCBrandColor.cacheImages.favorite
                a11yValues.append(NSLocalizedString("_favorite_", comment: ""))
            }

            // Share image
            if isShare {
                cell.imageShared.image = NCBrandColor.cacheImages.shared
            } else if tableShare != nil && tableShare?.shareType == 3 {
                cell.imageShared.image = NCBrandColor.cacheImages.shareByLink
            } else if tableShare != nil && tableShare?.shareType != 3 {
                cell.imageShared.image = NCBrandColor.cacheImages.shared
            } else {
                cell.imageShared.image = NCBrandColor.cacheImages.canShare
            }
            if appDelegate.account != metadata.account {
                cell.imageShared.image = NCBrandColor.cacheImages.shared
            }

            if metadata.status == NCGlobal.shared.metadataStatusInDownload || metadata.status == NCGlobal.shared.metadataStatusDownloading || metadata.status == NCGlobal.shared.metadataStatusInUpload || metadata.status == NCGlobal.shared.metadataStatusUploading {
                cell.setButtonMore(named: NCGlobal.shared.buttonMoreStop, image: NCBrandColor.cacheImages.buttonStop)
            } else if metadata.lock == true {
                cell.setButtonMore(named: NCGlobal.shared.buttonMoreLock, image: NCBrandColor.cacheImages.buttonMoreLock)
            } else {
                cell.setButtonMore(named: NCGlobal.shared.buttonMoreMore, image: NCBrandColor.cacheImages.buttonMore)
            }

            // Write status on Label Info
            switch metadata.status {
            case NCGlobal.shared.metadataStatusWaitDownload:
                cell.labelInfo.text = CCUtility.transformedSize(metadata.size) + " - " + NSLocalizedString("_status_wait_download_", comment: "")
                break
            case NCGlobal.shared.metadataStatusInDownload:
                cell.labelInfo.text = CCUtility.transformedSize(metadata.size) + " - " + NSLocalizedString("_status_in_download_", comment: "")
                break
            case NCGlobal.shared.metadataStatusDownloading:
                cell.labelInfo.text = CCUtility.transformedSize(metadata.size) + " - ↓ " + CCUtility.transformedSize(totalBytes)
                break
            case NCGlobal.shared.metadataStatusWaitUpload:
                cell.labelInfo.text = CCUtility.transformedSize(metadata.size) + " - " + NSLocalizedString("_status_wait_upload_", comment: "")
                break
            case NCGlobal.shared.metadataStatusInUpload:
                cell.labelInfo.text = CCUtility.transformedSize(metadata.size) + " - " + NSLocalizedString("_status_in_upload_", comment: "")
                break
            case NCGlobal.shared.metadataStatusUploading:
                cell.labelInfo.text = CCUtility.transformedSize(metadata.size) + " - ↑ " + CCUtility.transformedSize(totalBytes)
                break
            case NCGlobal.shared.metadataStatusUploadError:
                if metadata.sessionError != "" {
                    cell.labelInfo.text = NSLocalizedString("_status_wait_upload_", comment: "") + " " + metadata.sessionError
                } else {
                    cell.labelInfo.text = NSLocalizedString("_status_wait_upload_", comment: "")
                }
                break
            default:
                break
            }

            cell.accessibilityLabel = metadata.fileNameView + ", " + (cell.labelInfo.text ?? "")

            // Live Photo
            if metadata.livePhoto {
                cell.imageStatus.image = NCBrandColor.cacheImages.livePhoto
                a11yValues.append(NSLocalizedString("_upload_mov_livephoto_", comment: ""))
            }

            // E2EE
            if metadata.e2eEncrypted || isEncryptedFolder {
                cell.hideButtonShare(true)
            } else {
                cell.hideButtonShare(false)
            }

            // Remove last separator
            if collectionView.numberOfItems(inSection: indexPath.section) == indexPath.row + 1 {
                cell.separator.isHidden = true
            } else {
                cell.separator.isHidden = false
            }

            // Edit mode
            if isEditMode {
                cell.selectMode(true)
                if selectOcId.contains(metadata.ocId) {
                    cell.selected(true)
                    a11yValues.append(NSLocalizedString("_selected_", comment: ""))
                } else {
                    cell.selected(false)
                }
            } else {
                cell.selectMode(false)
            }
            cell.accessibilityValue = a11yValues.joined(separator: ", ")

            // Disable Share Button
            if appDelegate.disableSharesView {
                cell.hideButtonShare(true)
            }

            return cell
        }

        //
        // LAYOUT GRID
        //
        if layoutForView?.layout == NCGlobal.shared.layoutGrid {

            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath) as! NCGridCell
            cell.delegate = self

            cell.fileObjectId = metadata.ocId
            cell.fileUser = metadata.ownerId
            cell.labelTitle.text = metadata.fileNameView
            cell.labelTitle.textColor = NCBrandColor.shared.label

            cell.imageSelect.image = nil
            cell.imageStatus.image = nil
            cell.imageLocal.image = nil
            cell.imageFavorite.image = nil

            cell.imageItem.image = nil
            cell.imageItem.backgroundColor = nil

            // Progress
            var progress: Float = 0.0
            if let progressType = appDelegate.listProgress[metadata.ocId] {
                progress = progressType.progress
            }

            if metadata.status == NCGlobal.shared.metadataStatusDownloading || metadata.status == NCGlobal.shared.metadataStatusUploading {
                cell.progressView.isHidden = false
                cell.progressView.progress = progress
                cell.accessibilityLabel = metadata.fileNameView + ", \(Int(progress * 100))%"
            } else {
                cell.progressView.isHidden = true
                cell.progressView.progress = 0.0
                cell.accessibilityLabel = metadata.fileNameView
            }

            var a11yValues: [String] = []
            if metadata.ownerId != appDelegate.userId, appDelegate.account == metadata.account {
                a11yValues.append(NSLocalizedString("_shared_with_you_by_", comment: "") + " " + metadata.ownerDisplayName)
            }

            if metadata.directory {

                if metadata.e2eEncrypted {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderEncrypted
                } else if isShare {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderSharedWithMe
                } else if tableShare != nil && tableShare!.shareType != 3 {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderSharedWithMe
                } else if tableShare != nil && tableShare!.shareType == 3 {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderPublic
                } else if metadata.mountType == "group" {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderGroup
                } else if isMounted {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderExternal
                } else if metadata.fileName == autoUploadFileName && metadata.serverUrl == autoUploadDirectory {
                    cell.imageItem.image = NCBrandColor.cacheImages.folderAutomaticUpload
                } else {
                    cell.imageItem.image = NCBrandColor.cacheImages.folder
                }

                let lockServerUrl = CCUtility.stringAppendServerUrl(metadata.serverUrl, addFileName: metadata.fileName)!
                let tableDirectory = NCManageDatabase.shared.getTableDirectory(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@", appDelegate.account, lockServerUrl))

                // Local image: offline
                if tableDirectory != nil && tableDirectory!.offline {
                    cell.imageLocal.image = NCBrandColor.cacheImages.offlineFlag
                }

            } else {

                // image Local
                if dataSource.metadataOffLine.contains(metadata.ocId) {
                    cell.imageLocal.image = NCBrandColor.cacheImages.offlineFlag
                    a11yValues.append(NSLocalizedString("_offline_", comment: ""))
                } else if CCUtility.fileProviderStorageExists(metadata) {
                    cell.imageLocal.image = NCBrandColor.cacheImages.local
                }
            }

            // image Favorite
            if metadata.favorite {
                cell.imageFavorite.image = NCBrandColor.cacheImages.favorite
                a11yValues.append(NSLocalizedString("_favorite_", comment: ""))
            }

            // Transfer
            if metadata.status == NCGlobal.shared.metadataStatusInDownload || metadata.status == NCGlobal.shared.metadataStatusDownloading || metadata.status == NCGlobal.shared.metadataStatusInUpload || metadata.status == NCGlobal.shared.metadataStatusUploading {
                cell.setButtonMore(named: NCGlobal.shared.buttonMoreStop, image: NCBrandColor.cacheImages.buttonStop)
            } else if metadata.lock == true {
                cell.setButtonMore(named: NCGlobal.shared.buttonMoreLock, image: NCBrandColor.cacheImages.buttonMoreLock)
            } else {
                cell.setButtonMore(named: NCGlobal.shared.buttonMoreMore, image: NCBrandColor.cacheImages.buttonMore)
            }

            // Live Photo
            if metadata.livePhoto {
                cell.imageStatus.image = NCBrandColor.cacheImages.livePhoto
                a11yValues.append(NSLocalizedString("_upload_mov_livephoto_", comment: ""))
            }

            // Edit mode
            if isEditMode {
                cell.selectMode(true)
                if selectOcId.contains(metadata.ocId) {
                    cell.selected(true)
                    a11yValues.append(NSLocalizedString("_selected_", comment: ""))
                } else {
                    cell.selected(false)
                }
            } else {
                cell.selectMode(false)
            }
            cell.accessibilityValue = a11yValues.joined(separator: ", ")

            return cell
        }

        return collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath) as! NCGridCell
    }
}

extension NCCollectionViewCommon: UICollectionViewDelegateFlowLayout {

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {

        headerRichWorkspaceHeight = 0

        if let richWorkspaceText = richWorkspaceText {
            let trimmed = richWorkspaceText.trimmingCharacters(in: .whitespaces)
            if trimmed.count > 0 && !isSearching {
                headerRichWorkspaceHeight = UIScreen.main.bounds.size.height / 4
            }
        }

        return CGSize(width: collectionView.frame.width, height: headerHeight + headerRichWorkspaceHeight)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
        return CGSize(width: collectionView.frame.width, height: footerHeight)
    }
}