space-ios/iOSClient/Utility/NCUtilityGUI.swift

//
//  NCUtilityGUI.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 28/08/22.
//  Copyright © 2022 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 NextcloudKit
import SVGKit

class NCUtilityGUI{

    func createFilePreviewImage(ocId: String, etag: String, fileNameView: String, classFile: String, status: Int, createPreviewMedia: Bool) -> UIImage? {

        var imagePreview: UIImage?
        let filePath = CCUtility.getDirectoryProviderStorageOcId(ocId, fileNameView: fileNameView)!
        let iconImagePath = CCUtility.getDirectoryProviderStorageIconOcId(ocId, etag: etag)!

        if FileManager().fileExists(atPath: iconImagePath) {
            imagePreview = UIImage(contentsOfFile: iconImagePath)
        } else if !createPreviewMedia {
            return nil
        } else if createPreviewMedia && status >= NCGlobal.shared.metadataStatusNormal && classFile == NKCommon.typeClassFile.image.rawValue && FileManager().fileExists(atPath: filePath) {
            if let image = UIImage(contentsOfFile: filePath), let image = image.resizeImage(size: CGSize(width: NCGlobal.shared.sizeIcon, height: NCGlobal.shared.sizeIcon)), let data = image.jpegData(compressionQuality: 0.5) {
                do {
                    try data.write(to: URL.init(fileURLWithPath: iconImagePath), options: .atomic)
                    imagePreview = image
                } catch { }
            }
        } else if createPreviewMedia && status >= NCGlobal.shared.metadataStatusNormal && classFile == NKCommon.typeClassFile.video.rawValue && FileManager().fileExists(atPath: filePath) {
            if let image = NCUtility.shared.imageFromVideo(url: URL(fileURLWithPath: filePath), at: 0), let image = image.resizeImage(size: CGSize(width: NCGlobal.shared.sizeIcon, height: NCGlobal.shared.sizeIcon)), let data = image.jpegData(compressionQuality: 0.5) {
                do {
                    try data.write(to: URL.init(fileURLWithPath: iconImagePath), options: .atomic)
                    imagePreview = image
                } catch { }
            }
        }

        return imagePreview
    }
    
    func getImageUserData(url: URL, fileName: String, size: CGFloat, completition: @escaping (_ image: UIImage?) -> () = { _ in }) {
        
        let fileNamePath: String = CCUtility.getDirectoryUserData() + "/" + fileName + ".png"
        let size = CGSize(width: size, height: size)
        
        if !FileManager().fileExists(atPath: fileNamePath) {
            NextcloudKit.shared.getPreview(url: url) { account, data, error in
                guard let data = data else { return completition(nil) }
                var image: UIImage?
                if let uiImage = UIImage(data: data) {
                    image = uiImage.resizeImage(size: size)
                } else if let svgImage = SVGKImage(data: data) {
                    svgImage.size = size
                    image = svgImage.uiImage
                }
                if let image = image {
                    do {
                        try image.pngData()?.write(to: URL(fileURLWithPath: fileNamePath), options: .atomic)
                    } catch { }
                }
                completition(image)
            }
        } else {
            completition(UIImage(contentsOfFile: fileNamePath))
        }
    }
}