//
//  NCOperationQueue.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 03/06/2020.
//  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 Foundation
import Queuer
import NCCommunication

@objc class NCOperationQueue: NSObject {
    @objc public static let shared: NCOperationQueue = {
        let instance = NCOperationQueue()
        return instance
    }()
    
    let downloadQueue = Queuer(name: "downloadQueue", maxConcurrentOperationCount: 5, qualityOfService: .default)
    let downloadThumbnailQueue = Queuer(name: "downloadThumbnailQueue", maxConcurrentOperationCount: 10, qualityOfService: .default)
    
    @objc func download(metadata: tableMetadata, selector: String, setFavorite: Bool) {
        downloadQueue.addOperation(NCOperationDownload.init(metadata: metadata, selector: selector, setFavorite: setFavorite))
    }
    
    @objc func downloadThumbnail(metadata: tableMetadata, activeUrl: String, view: Any, indexPath: IndexPath) {
        if metadata.hasPreview && (!CCUtility.fileProviderStorageIconExists(metadata.ocId, fileNameView: metadata.fileName) || metadata.typeFile == k_metadataTypeFile_document) {
            downloadThumbnailQueue.addOperation(NCOperationDownloadThumbnail.init(metadata: metadata, activeUrl: activeUrl, view: view, indexPath: indexPath))
        }
    }
}

class NCOperationDownload: ConcurrentOperation {
   
    private var metadata: tableMetadata
    private var selector: String
    private var setFavorite: Bool
    
    init(metadata: tableMetadata, selector: String, setFavorite: Bool) {
        self.metadata = metadata
        self.selector = selector
        self.setFavorite = setFavorite
    }
    
    override func start() {
        NCNetworking.shared.download(metadata: self.metadata, selector: self.selector, setFavorite: self.setFavorite) { (_) in
            self.finish()
        }
    }
}

class NCOperationDownloadThumbnail: ConcurrentOperation {
   
    private var metadata: tableMetadata
    private var activeUrl: String
    private var view: Any
    private var indexPath: IndexPath
    
    init(metadata: tableMetadata, activeUrl: String, view: Any, indexPath: IndexPath) {
        self.metadata = metadata
        self.activeUrl = activeUrl
        self.view = view
        self.indexPath = indexPath
    }
    
    override func start() {
            
        let fileNamePath = CCUtility.returnFileNamePath(fromFileName: metadata.fileName, serverUrl: metadata.serverUrl, activeUrl: activeUrl)!
        let fileNameLocalPath = CCUtility.getDirectoryProviderStorageIconOcId(metadata.ocId, fileNameView: metadata.fileNameView)!
            
        NCCommunication.shared.downloadPreview(fileNamePathOrFileId: fileNamePath, fileNameLocalPath: fileNameLocalPath, width: Int(k_sizePreview), height: Int(k_sizePreview)) { (account, data, errorCode, errorMessage) in
            
            if errorCode == 0 && data != nil  {
                if let image = UIImage.init(data: data!) {
                    
                    if self.view is UICollectionView && NCMainCommon.sharedInstance.isValidIndexPath(self.indexPath, view: self.view) {
                        if let cell = (self.view as! UICollectionView).cellForItem(at: self.indexPath) {
                            if cell is NCListCell {
                                (cell as! NCListCell).imageItem.image = image
                            } else if cell is NCGridCell {
                                (cell as! NCGridCell).imageItem.image = image
                            } else if cell is NCGridMediaCell {
                                (cell as! NCGridMediaCell).imageItem.image = image
                            }
                        }
                    }
                    
                    if self.view is UITableView && CCUtility.fileProviderStorageIconExists(self.metadata.ocId, fileNameView: self.metadata.fileName) && NCMainCommon.sharedInstance.isValidIndexPath(self.indexPath, view: self.view) {
                        if let cell = (self.view as! UITableView).cellForRow(at: self.indexPath) {
                            if cell is CCCellMainTransfer {
                                (cell as! CCCellMainTransfer).file.image = image
                            } else if cell is CCCellMain {
                                (cell as! CCCellMain).file.image = image
                            }
                        }
                    }
                }
            }
            self.finish()
        }
    }
}