space-ios/iOSClient/Offline/NCOffline.swift

//
//  NCOffline.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 24/10/2018.
//  Copyright © 2018 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 Foundation

class NCOffline: NCCollectionViewCommon  {
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        
        appDelegate.activeOffline = self
        titleCurrentFolder = NSLocalizedString("_manage_file_offline_", comment: "")
        layoutKey = k_layout_view_offline
    }
    
    // MARK: DZNEmpty
    
    override func image(forEmptyDataSet scrollView: UIScrollView) -> UIImage? {
        return CCGraphics.changeThemingColorImage(UIImage.init(named: "folder"), width: 300, height: 300, color: NCBrandColor.sharedInstance.brandElement)
    }
    
    override func title(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString? {
        let text = "\n"+NSLocalizedString("_files_no_files_", comment: "")
        let attributes = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 20), NSAttributedString.Key.foregroundColor: UIColor.lightGray]
        return NSAttributedString.init(string: text, attributes: attributes)
    }
        
    // MARK: SEGUE
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        let photoDataSource: NSMutableArray = []
        
        for metadata in (dataSource?.metadatas ?? [tableMetadata]()) {
            if metadata.typeFile == k_metadataTypeFile_image || metadata.typeFile == k_metadataTypeFile_video {
                photoDataSource.add(metadata)
            }
        }
        
        if let segueNavigationController = segue.destination as? UINavigationController {
            if let segueViewController = segueNavigationController.topViewController as? NCDetailViewController {
                segueViewController.metadata = metadataPush
            }
        }
    }
    
    // MARK: - Collection View
    
    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
        guard let metadata = dataSource?.cellForItemAt(indexPath: indexPath) else { return }
        metadataPush = metadata
        
        if isEditMode {
            if let index = selectOcId.firstIndex(of: metadata.ocId) {
                selectOcId.remove(at: index)
            } else {
                selectOcId.append(metadata.ocId)
            }
            collectionView.reloadItems(at: [indexPath])
            return
        }
        
        if metadata.directory {
            
            guard let serverUrlPush = CCUtility.stringAppendServerUrl(metadataPush!.serverUrl, addFileName: metadataPush!.fileName) else { return }
            let ncOffline:NCOffline = UIStoryboard(name: "NCOffline", bundle: nil).instantiateInitialViewController() as! NCOffline
            
            ncOffline.serverUrl = serverUrlPush
            ncOffline.titleCurrentFolder = metadataPush!.fileNameView
            
            self.navigationController?.pushViewController(ncOffline, animated: true)
            
        } else {
            
            if CCUtility.fileProviderStorageExists(metadataPush?.ocId, fileNameView: metadataPush?.fileNameView) {
                performSegue(withIdentifier: "segueDetail", sender: self)
            } else {
                NCNetworking.shared.download(metadata: metadataPush!, selector: "") { (errorCode) in
                    if errorCode == 0 {
                        self.performSegue(withIdentifier: "segueDetail", sender: self)
                    }
                }
            }
        }
    }
    
    // MARK: - NC API & Algorithm

    override func reloadDataSource() {
           
           var ocIds: [String] = []
           var sort: String
           var ascending: Bool
           var directoryOnTop: Bool
           
           (layout, sort, ascending, groupBy, directoryOnTop, titleButton, itemForLine) = NCUtility.shared.getLayoutForView(key: k_layout_view_offline)

           if serverUrl == "" {
               
               if let directories = NCManageDatabase.sharedInstance.getTablesDirectory(predicate: NSPredicate(format: "account == %@ AND offline == true", appDelegate.account), sorted: "serverUrl", ascending: true) {
                   for directory: tableDirectory in directories {
                       ocIds.append(directory.ocId)
                   }
               }
               
               let files = NCManageDatabase.sharedInstance.getTableLocalFiles(predicate: NSPredicate(format: "account == %@ AND offline == true", appDelegate.account), sorted: "fileName", ascending: true)
               for file: tableLocalFile in files {
                   ocIds.append(file.ocId)
               }
               
               let metadatasSource = NCManageDatabase.sharedInstance.getMetadatas(predicate: NSPredicate(format: "account == %@ AND ocId IN %@", appDelegate.account, ocIds))
               self.dataSource = NCDataSource.init(metadatasSource: metadatasSource, sort: sort, ascending: ascending, directoryOnTop: directoryOnTop, filterLivePhoto: true)
               
           } else {
               
               let metadatasSource = NCManageDatabase.sharedInstance.getMetadatas(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@", appDelegate.account, serverUrl))
               self.dataSource = NCDataSource.init(metadatasSource: metadatasSource, sort: sort, ascending: ascending, directoryOnTop: directoryOnTop, filterLivePhoto: true)
           }
           
           refreshControl.endRefreshing()
           collectionView.reloadData()
       }
       
       override func reloadDataSourceNetwork() {
           
           if serverUrl != "" {
           
               NCNetworking.shared.readFolder(serverUrl: serverUrl, account: appDelegate.account) { (account, metadataFolder, metadatas, metadatasUpdate, metadatasLocalUpdate, errorCode, errorDescription) in
                   if errorCode == 0 {
                       for metadata in metadatas ?? [] {
                           if !metadata.directory {
                               let localFile = NCManageDatabase.sharedInstance.getTableLocalFile(predicate: NSPredicate(format: "ocId == %@", metadata.ocId))
                               if localFile == nil || localFile?.etag != metadata.etag {
                                   NCOperationQueue.shared.download(metadata: metadata, selector: selectorDownloadFile, setFavorite: false)
                               }
                           }
                       }
                   }
                   self.reloadDataSource()
               }
           }
       }
}