space-ios/iOSClient/Main/Create cloud/NCCreateFormUploadScanDocument.swift

//
//  NCCreateFormUploadScanDocument.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 14/11/2018.
//  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 UIKit
import NextcloudKit
import Vision
import VisionKit
import Photos
import XLForm

class NCCreateFormUploadScanDocument: XLFormViewController, NCSelectDelegate, NCCreateFormUploadConflictDelegate {

    let appDelegate = UIApplication.shared.delegate as! AppDelegate

    enum typeQuality {
        case low
        case medium
        case high
    }
    var quality: typeQuality = .medium

    var serverUrl = ""
    var titleServerUrl = ""
    var arrayImages: [UIImage] = []
    var fileName = CCUtility.createFileNameDate("scan", extension: "pdf")
    var password: String = ""
    var fileType = "PDF"

    var cellBackgoundColor = UIColor.secondarySystemGroupedBackground

    // MARK: - View Life Cycle

    convenience init(serverUrl: String, arrayImages: [UIImage]) {

        self.init()

        if serverUrl == NCUtilityFileSystem.shared.getHomeServer(urlBase: appDelegate.urlBase, userId: appDelegate.userId) {
            titleServerUrl = "/"
        } else {
            titleServerUrl = (serverUrl as NSString).lastPathComponent
        }

        self.serverUrl = serverUrl
        self.arrayImages = arrayImages
    }

    override func viewDidLoad() {

        super.viewDidLoad()

        self.title = NSLocalizedString("_save_settings_", comment: "")

        view.backgroundColor = .systemGroupedBackground
        tableView.backgroundColor = .systemGroupedBackground
        cellBackgoundColor = .secondarySystemGroupedBackground

        let saveButton: UIBarButtonItem = UIBarButtonItem(title: NSLocalizedString("_save_", comment: ""), style: UIBarButtonItem.Style.plain, target: self, action: #selector(save))
        self.navigationItem.rightBarButtonItem = saveButton

        NCUtility.shared.colorNavigationController(navigationController, backgroundColor: .systemBackground, titleColor: .label, tintColor: nil, withoutShadow: false)

        tableView.separatorStyle = UITableViewCell.SeparatorStyle.none

        //        self.tableView.sectionHeaderHeight = 10
        //        self.tableView.sectionFooterHeight = 10        

        //        let row : XLFormRowDescriptor  = self.form.formRow(withTag: "fileName")!
        //        let rowCell = row.cell(forForm: self)
        //        rowCell.becomeFirstResponder()

        initializeForm()

        let value = CCUtility.getTextRecognitionStatus()
        setTextRecognition(newValue: value)
    }

    // MARK: XLForm

    func initializeForm() {

        let form: XLFormDescriptor = XLFormDescriptor() as XLFormDescriptor
        form.rowNavigationOptions = XLFormRowNavigationOptions.stopDisableRow

        var section: XLFormSectionDescriptor
        var row: XLFormRowDescriptor

        // Section: Destination Folder

        section = XLFormSectionDescriptor.formSection(withTitle: NSLocalizedString("_save_path_", comment: ""))
        form.addFormSection(section)

        row = XLFormRowDescriptor(tag: "ButtonDestinationFolder", rowType: XLFormRowDescriptorTypeButton, title: self.titleServerUrl)
        row.action.formSelector = #selector(changeDestinationFolder(_:))
        row.cellConfig["backgroundColor"] = cellBackgoundColor

        row.cellConfig["imageView.image"] =  UIImage(named: "folder")!.image(color: NCBrandColor.shared.brandElement, size: 25)

        row.cellConfig["textLabel.textAlignment"] = NSTextAlignment.right.rawValue
        row.cellConfig["textLabel.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textLabel.textColor"] = UIColor.label

        section.addFormRow(row)

        // Section: Quality

        section = XLFormSectionDescriptor.formSection(withTitle: NSLocalizedString("_quality_image_title_", comment: ""))
        form.addFormSection(section)

        row = XLFormRowDescriptor(tag: "compressionQuality", rowType: XLFormRowDescriptorTypeSlider)
        row.value = 0.5
        row.title = NSLocalizedString("_quality_medium_", comment: "")
        row.cellConfig["backgroundColor"] = cellBackgoundColor

        row.cellConfig["slider.minimumTrackTintColor"] = NCBrandColor.shared.brandElement

        row.cellConfig["slider.maximumValue"] = 1
        row.cellConfig["slider.minimumValue"] = 0
        row.cellConfig["steps"] = 2

        row.cellConfig["textLabel.textAlignment"] = NSTextAlignment.center.rawValue
        row.cellConfig["textLabel.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textLabel.textColor"] = UIColor.label

        section.addFormRow(row)

        // Section: Password

        section = XLFormSectionDescriptor.formSection(withTitle: NSLocalizedString("_pdf_password_", comment: ""))
        form.addFormSection(section)

        row = XLFormRowDescriptor(tag: "password", rowType: XLFormRowDescriptorTypePassword, title: NSLocalizedString("_password_", comment: ""))
        row.cellConfig["backgroundColor"] = cellBackgoundColor

        row.cellConfig["textLabel.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textLabel.textColor"] = UIColor.label

        row.cellConfig["textField.textAlignment"] = NSTextAlignment.right.rawValue
        row.cellConfig["textField.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textField.textColor"] = UIColor.label

        section.addFormRow(row)

        // Section: Text recognition

        section = XLFormSectionDescriptor.formSection(withTitle: NSLocalizedString("_text_recognition_", comment: ""))
        form.addFormSection(section)

        row = XLFormRowDescriptor(tag: "textRecognition", rowType: XLFormRowDescriptorTypeBooleanSwitch, title: NSLocalizedString("_text_recognition_", comment: ""))
        row.value = 0
        row.cellConfig["backgroundColor"] = cellBackgoundColor

        row.cellConfig["imageView.image"] = UIImage(named: "textRecognition")!.image(color: NCBrandColor.shared.brandElement, size: 25)

        row.cellConfig["textLabel.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textLabel.textColor"] = UIColor.label

        section.addFormRow(row)

        // Section: File

        section = XLFormSectionDescriptor.formSection(withTitle: NSLocalizedString("_file_creation_", comment: ""))
        form.addFormSection(section)

        row = XLFormRowDescriptor(tag: "filetype", rowType: XLFormRowDescriptorTypeSelectorSegmentedControl, title: NSLocalizedString("_file_type_", comment: ""))
        if arrayImages.count == 1 {
            row.selectorOptions = ["PDF", "JPG"]
        } else {
            row.selectorOptions = ["PDF"]
        }
        row.value = "PDF"
        row.cellConfig["backgroundColor"] = cellBackgoundColor

        row.cellConfig["tintColor"] = NCBrandColor.shared.brandElement
        row.cellConfig["textLabel.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textLabel.textColor"] = UIColor.label

        section.addFormRow(row)

        row = XLFormRowDescriptor(tag: "fileName", rowType: XLFormRowDescriptorTypeText, title: NSLocalizedString("_filename_", comment: ""))
        row.value = self.fileName
        row.cellConfig["backgroundColor"] = cellBackgoundColor

        row.cellConfig["textLabel.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textLabel.textColor"] = UIColor.label

        row.cellConfig["textField.textAlignment"] = NSTextAlignment.right.rawValue
        row.cellConfig["textField.font"] = UIFont.systemFont(ofSize: 15.0)
        row.cellConfig["textField.textColor"] = UIColor.label

        section.addFormRow(row)

        self.form = form
    }

    override func formRowDescriptorValueHasChanged(_ formRow: XLFormRowDescriptor!, oldValue: Any!, newValue: Any!) {

        super.formRowDescriptorValueHasChanged(formRow, oldValue: oldValue, newValue: newValue)

        if formRow.tag == "textRecognition" {

            self.setTextRecognition(newValue: newValue as! Int)
        }

        if formRow.tag == "fileName" {

            self.form.delegate = nil

            let fileNameNew = newValue as? String

            if fileNameNew != nil {
                self.fileName = CCUtility.removeForbiddenCharactersServer(fileNameNew)
            } else {
                self.fileName = ""
            }

            formRow.value = self.fileName

            self.updateFormRow(formRow)

            self.form.delegate = self
        }

        if formRow.tag == "compressionQuality" {

            self.form.delegate = nil

            // let row : XLFormRowDescriptor  = self.form.formRow(withTag: "descriptionQuality")!
            let newQuality = newValue as? NSNumber
            let compressionQuality = (newQuality?.doubleValue)!

            if compressionQuality >= 0.0 && compressionQuality <= 0.3 {
                formRow.title = NSLocalizedString("_quality_low_", comment: "")
                quality = typeQuality.low
            } else if compressionQuality > 0.3 && compressionQuality <= 0.6 {
                formRow.title = NSLocalizedString("_quality_medium_", comment: "")
                quality = typeQuality.medium
            } else if compressionQuality > 0.6 && compressionQuality <= 1.0 {
                formRow.title = NSLocalizedString("_quality_high_", comment: "")
                quality = typeQuality.high
            }

            self.updateFormRow(formRow)

            self.form.delegate = self
        }

        if formRow.tag == "password" {
            let stringPassword = newValue as? String
            if stringPassword != nil {
                password = stringPassword!
            } else {
                password = ""
            }
        }

        if formRow.tag == "filetype" {
            fileType = newValue as! String

            let rowFileName: XLFormRowDescriptor  = self.form.formRow(withTag: "fileName")!
            let rowPassword: XLFormRowDescriptor  = self.form.formRow(withTag: "password")!

            rowFileName.value = createFileName(rowFileName.value as? String)

            self.updateFormRow(rowFileName)

            // rowPassword
            if fileType == "JPG" || fileType == "TXT" {
                rowPassword.value = ""
                password = ""
                rowPassword.disabled = true
            } else {
                rowPassword.disabled = false
            }

            self.updateFormRow(rowPassword)
        }
    }

    func setTextRecognition(newValue: Int) {

        let rowCompressionQuality: XLFormRowDescriptor = self.form.formRow(withTag: "compressionQuality")!
        let rowFileTape: XLFormRowDescriptor = self.form.formRow(withTag: "filetype")!
        let rowFileName: XLFormRowDescriptor = self.form.formRow(withTag: "fileName")!
        let rowPassword: XLFormRowDescriptor = self.form.formRow(withTag: "password")!
        let rowTextRecognition: XLFormRowDescriptor = self.form.formRow(withTag: "textRecognition")!

        self.form.delegate = nil

        if newValue == 1 {
            rowFileTape.selectorOptions = ["PDF", "TXT"]
            rowFileTape.value = "PDF"
            fileType = "PDF"
            rowPassword.disabled = true
            rowCompressionQuality.disabled = false
        } else {
            if arrayImages.count == 1 {
                rowFileTape.selectorOptions = ["PDF", "JPG"]
            } else {
                rowFileTape.selectorOptions = ["PDF"]
            }
            rowFileTape.value = "PDF"
            fileType = "PDF"
            rowPassword.disabled = false
            rowCompressionQuality.disabled = false
        }

        rowFileName.value = createFileName(rowFileName.value as? String)
        self.updateFormRow(rowFileName)
        self.tableView.reloadData()

        CCUtility.setTextRecognitionStatus(newValue)
        rowTextRecognition.value = newValue

        self.form.delegate = self
    }

    func createFileName(_ fileName: String?) -> String {

        var name: String = ""
        var newFileName: String = ""

        if fileName == nil || fileName == "" {
            name = CCUtility.createFileNameDate("scan", extension: "pdf") ?? "scan.pdf"
        } else {
            name = fileName!
        }

        let ext = (name as NSString).pathExtension.uppercased()

        if ext == "" {
            newFileName = name + "." + fileType.lowercased()
        } else {
            newFileName = (name as NSString).deletingPathExtension + "." + fileType.lowercased()
        }

        return newFileName
    }

    // MARK: - Action

    func dismissSelect(serverUrl: String?, metadata: tableMetadata?, type: String, items: [Any], overwrite: Bool, copy: Bool, move: Bool) {

        if serverUrl != nil {

            CCUtility.setDirectoryScanDocuments(serverUrl!)
            self.serverUrl = serverUrl!

            if serverUrl == NCUtilityFileSystem.shared.getHomeServer(urlBase: appDelegate.urlBase, userId: appDelegate.userId) {
                self.titleServerUrl = "/"
            } else {
                self.titleServerUrl = (serverUrl! as NSString).lastPathComponent
            }

            // Update
            let row: XLFormRowDescriptor  = self.form.formRow(withTag: "ButtonDestinationFolder")!
            row.title = self.titleServerUrl
            self.updateFormRow(row)
        }
    }

    @objc func save() {

        let rowFileName: XLFormRowDescriptor  = self.form.formRow(withTag: "fileName")!
        guard let name = rowFileName.value else {
            return
        }
        if name as! String == "" {
            return
        }

        let ext = (name as! NSString).pathExtension.uppercased()
        var fileNameSave = ""

        if ext == "" {
            fileNameSave = name as! String + "." + fileType.lowercased()
        } else {
            fileNameSave = (name as! NSString).deletingPathExtension + "." + fileType.lowercased()
        }

        // Create metadata for upload
        let metadataForUpload = NCManageDatabase.shared.createMetadata(account: appDelegate.account, user: appDelegate.user, userId: appDelegate.userId, fileName: fileNameSave, fileNameView: fileNameSave, ocId: UUID().uuidString, serverUrl: serverUrl, urlBase: appDelegate.urlBase, url: "", contentType: "")

        metadataForUpload.session = NCNetworking.shared.sessionIdentifierBackground
        metadataForUpload.sessionSelector = NCGlobal.shared.selectorUploadFile
        metadataForUpload.status = NCGlobal.shared.metadataStatusWaitUpload

        if NCManageDatabase.shared.getMetadataConflict(account: appDelegate.account, serverUrl: serverUrl, fileName: fileNameSave) != nil {

            guard let conflict = UIStoryboard(name: "NCCreateFormUploadConflict", bundle: nil).instantiateInitialViewController() as? NCCreateFormUploadConflict else { return }

            conflict.textLabelDetailNewFile = NSLocalizedString("_now_", comment: "")
            conflict.serverUrl = serverUrl
            conflict.metadatasUploadInConflict = [metadataForUpload]
            conflict.delegate = self
            conflict.isE2EE = CCUtility.isFolderEncrypted(serverUrl, e2eEncrypted: false, account: appDelegate.account, urlBase: appDelegate.urlBase, userId: appDelegate.userId)

            self.present(conflict, animated: true, completion: nil)

        } else {

            NCActivityIndicator.shared.start(backgroundView: self.view)

            DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
                self.dismissAndUpload(metadataForUpload)
            }
        }
    }

    func dismissCreateFormUploadConflict(metadatas: [tableMetadata]?) {

        if metadatas != nil && metadatas!.count > 0 {

            NCActivityIndicator.shared.start(backgroundView: self.view)

            DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
                self.dismissAndUpload(metadatas![0])
            }
        }
    }

    func dismissAndUpload(_ metadata: tableMetadata) {

        guard let fileNameGenerateExport = CCUtility.getDirectoryProviderStorageOcId(metadata.ocId, fileNameView: metadata.fileNameView) else {
            NCActivityIndicator.shared.stop()

            let error = NKError(errorCode: NCGlobal.shared.errorCreationFile, errorDescription: "_error_creation_file_")
            NCContentPresenter.shared.showError(error: error)
            return
        }
        let fileUrl = URL(fileURLWithPath: fileNameGenerateExport)

        // Text Recognition TXT
        if fileType == "TXT" && self.form.formRow(withTag: "textRecognition")!.value as! Int == 1 {

            var textFile = ""
            for image in self.arrayImages {

                let requestHandler = VNImageRequestHandler(cgImage: image.cgImage!, options: [:])

                let request = VNRecognizeTextRequest { request, _ in
                    guard let observations = request.results as? [VNRecognizedTextObservation] else {
                        NCActivityIndicator.shared.stop()
                        return
                    }
                    for observation in observations {
                        guard let textLine = observation.topCandidates(1).first else {
                            continue
                        }

                        textFile += textLine.string
                        textFile += "\n"
                    }
                }

                request.recognitionLevel = .accurate
                request.usesLanguageCorrection = true
                try? requestHandler.perform([request])
            }

            do {
                try textFile.write(to: fileUrl, atomically: true, encoding: .utf8)
            } catch {
                NCActivityIndicator.shared.stop()
                let error = NKError(errorCode: NCGlobal.shared.errorCreationFile, errorDescription: "_error_creation_file_")
                NCContentPresenter.shared.showError(error: error)
                return
            }
        }

        if fileType == "PDF" {

            let pdfData = NSMutableData()

            if password.count > 0 {
                let info: [AnyHashable: Any] = [kCGPDFContextUserPassword as String: password, kCGPDFContextOwnerPassword as String: password]
                UIGraphicsBeginPDFContextToData(pdfData, CGRect.zero, info)
            } else {
                UIGraphicsBeginPDFContextToData(pdfData, CGRect.zero, nil)
            }
            var fontColor = UIColor.clear
#if targetEnvironment(simulator)
            fontColor = UIColor.red
#endif

            for var image in self.arrayImages {

                image = changeCompressionImage(image)

                let bounds = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)

                if self.form.formRow(withTag: "textRecognition")!.value as! Int == 1 {

                    UIGraphicsBeginPDFPageWithInfo(bounds, nil)
                    image.draw(in: bounds)

                    let requestHandler = VNImageRequestHandler(cgImage: image.cgImage!, options: [:])

                    let request = VNRecognizeTextRequest { request, _ in
                        guard let observations = request.results as? [VNRecognizedTextObservation] else {
                            NCActivityIndicator.shared.stop()
                            return
                        }
                        for observation in observations {
                            guard let textLine = observation.topCandidates(1).first else {
                                continue
                            }

                            var t: CGAffineTransform = CGAffineTransform.identity
                            t = t.scaledBy(x: image.size.width, y: -image.size.height)
                            t = t.translatedBy(x: 0, y: -1)
                            let rect = observation.boundingBox.applying(t)
                            let text = textLine.string

                            let font = UIFont.systemFont(ofSize: rect.size.height, weight: .regular)
                            let attributes = self.bestFittingFont(for: text, in: rect, fontDescriptor: font.fontDescriptor, fontColor: fontColor)

                            text.draw(with: rect, options: .usesLineFragmentOrigin, attributes: attributes, context: nil)
                        }
                    }

                    request.recognitionLevel = .accurate
                    request.usesLanguageCorrection = true
                    try? requestHandler.perform([request])

                } else {

                    UIGraphicsBeginPDFPageWithInfo(bounds, nil)
                    image.draw(in: bounds)
                }
            }

            UIGraphicsEndPDFContext()

            do {
                try pdfData.write(to: fileUrl, options: .atomic)
            } catch {
                print("error catched")
            }
        }

        if fileType == "JPG" {

            let image = changeCompressionImage(self.arrayImages[0])

            guard let data = image.jpegData(compressionQuality: CGFloat(0.5)) else {
                NCActivityIndicator.shared.stop()
                let error = NKError(errorCode: NCGlobal.shared.errorCreationFile, errorDescription: "_error_creation_file_")
                NCContentPresenter.shared.showError(error: error)
                return
            }

            do {
                try data.write(to: fileUrl, options: .atomic)
            } catch {
                NCActivityIndicator.shared.stop()
                let error = NKError(errorCode: NCGlobal.shared.errorCreationFile, errorDescription: "_error_creation_file_")
                NCContentPresenter.shared.showError(error: error)
                return
            }
        }
        metadata.size = NCUtilityFileSystem.shared.getFileSize(filePath: fileNameGenerateExport)

        NCActivityIndicator.shared.stop()

        NCNetworkingProcessUpload.shared.createProcessUploads(metadatas: [metadata], completion: { _ in })

        // Request delete all image scanned
        let alertController = UIAlertController(title: "", message: NSLocalizedString("_delete_all_scanned_images_", comment: ""), preferredStyle: .alert)

        let actionYes = UIAlertAction(title: NSLocalizedString("_yes_delete_", comment: ""), style: .default) { (_: UIAlertAction) in

            let path = CCUtility.getDirectoryScan()!

            do {
                let filePaths = try FileManager.default.contentsOfDirectory(atPath: path)
                for filePath in filePaths {
                    try FileManager.default.removeItem(atPath: path + "/" + filePath)
                }
            } catch let error as NSError {
                print("Error: \(error.debugDescription)")
            }

            self.dismiss(animated: true, completion: nil)
        }

        let actionNo = UIAlertAction(title: NSLocalizedString("_no_delete_", comment: ""), style: .default) { (_: UIAlertAction) in
            self.dismiss(animated: true, completion: nil)
        }

        alertController.addAction(actionYes)
        alertController.addAction(actionNo)
        self.present(alertController, animated: true, completion: nil)
    }

    func cancel() {

        self.dismiss(animated: true, completion: nil)
    }

    @objc func changeDestinationFolder(_ sender: XLFormRowDescriptor) {

        self.deselectFormRow(sender)

        let storyboard = UIStoryboard(name: "NCSelect", bundle: nil)
        let navigationController = storyboard.instantiateInitialViewController() as! UINavigationController
        let viewController = navigationController.topViewController as! NCSelect

        viewController.delegate = self
        viewController.typeOfCommandView = .selectCreateFolder
        viewController.includeDirectoryE2EEncryption = true

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

    func changeCompressionImage(_ image: UIImage) -> UIImage {

        var compressionQuality: CGFloat = 0.5
        var baseHeight: Float = 595.2    // A4
        var baseWidth: Float = 841.8     // A4

        switch quality {
        case .low:
            baseHeight *= 1
            baseWidth *= 1
            compressionQuality = 0.3
        case .medium:
            baseHeight *= 2
            baseWidth *= 2
            compressionQuality = 0.6
        case .high:
            baseHeight *= 4
            baseWidth *= 4
            compressionQuality = 0.9
        }

        var newHeight = Float(image.size.height)
        var newWidth = Float(image.size.width)
        var imgRatio: Float = newWidth / newHeight
        let baseRatio: Float = baseWidth / baseHeight

        if newHeight > baseHeight || newWidth > baseWidth {
            if imgRatio < baseRatio {
                imgRatio = baseHeight / newHeight
                newWidth = imgRatio * newWidth
                newHeight = baseHeight
            } else if imgRatio > baseRatio {
                imgRatio = baseWidth / newWidth
                newHeight = imgRatio * newHeight
                newWidth = baseWidth
            } else {
                newHeight = baseHeight
                newWidth = baseWidth
            }
        }

        let rect = CGRect(x: 0.0, y: 0.0, width: CGFloat(newWidth), height: CGFloat(newHeight))
        UIGraphicsBeginImageContext(rect.size)
        image.draw(in: rect)
        let img = UIGraphicsGetImageFromCurrentImageContext()
        let imageData = img?.jpegData(compressionQuality: CGFloat(compressionQuality))
        UIGraphicsEndImageContext()
        return UIImage(data: imageData!) ?? image
    }

    func bestFittingFont(for text: String, in bounds: CGRect, fontDescriptor: UIFontDescriptor, fontColor: UIColor) -> [NSAttributedString.Key: Any] {

        let constrainingDimension = min(bounds.width, bounds.height)
        let properBounds = CGRect(origin: .zero, size: bounds.size)
        var attributes: [NSAttributedString.Key: Any] = [:]

        let infiniteBounds = CGSize(width: CGFloat.infinity, height: CGFloat.infinity)
        var bestFontSize: CGFloat = constrainingDimension

        // Search font (H)
        for fontSize in stride(from: bestFontSize, through: 0, by: -1) {
            let newFont = UIFont(descriptor: fontDescriptor, size: fontSize)
            attributes[.font] = newFont

            let currentFrame = text.boundingRect(with: infiniteBounds, options: [.usesLineFragmentOrigin, .usesFontLeading], attributes: attributes, context: nil)

            if properBounds.contains(currentFrame) {
                bestFontSize = fontSize
                break
            }
        }

        // Search kern (W)
        let font = UIFont(descriptor: fontDescriptor, size: bestFontSize)
        attributes = [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: fontColor, NSAttributedString.Key.kern: 0] as [NSAttributedString.Key: Any]
        for kern in stride(from: 0, through: 100, by: 0.1) {
            let attributesTmp = [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: fontColor, NSAttributedString.Key.kern: kern] as [NSAttributedString.Key: Any]
            let size = text.size(withAttributes: attributesTmp).width
            if size <= bounds.width {
                attributes = attributesTmp
            } else {
                break
            }
        }

        return attributes
    }

}

class NCCreateScanDocument: NSObject, VNDocumentCameraViewControllerDelegate {
    @objc static let shared: NCCreateScanDocument = {
        let instance = NCCreateScanDocument()
        return instance
    }()

    var viewController: UIViewController?

    func openScannerDocument(viewController: UIViewController) {

        self.viewController = viewController

        guard VNDocumentCameraViewController.isSupported else { return }

        let controller = VNDocumentCameraViewController()
        controller.delegate = self

        self.viewController?.present(controller, animated: true)
    }

    func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {

        for pageNumber in 0..<scan.pageCount {
            let fileName = CCUtility.createFileName("scan.png", fileDate: Date(), fileType: PHAssetMediaType.image, keyFileName: NCGlobal.shared.keyFileNameMask, keyFileNameType: NCGlobal.shared.keyFileNameType, keyFileNameOriginal: NCGlobal.shared.keyFileNameOriginal, forcedNewFileName: true)!
            let fileNamePath = CCUtility.getDirectoryScan() + "/" + fileName
            let image = scan.imageOfPage(at: pageNumber)
            do {
                try image.pngData()?.write(to: NSURL.fileURL(withPath: fileNamePath))
            } catch { }
        }

        controller.dismiss(animated: true) {
            if let viewController = self.viewController as? NCScan {
                viewController.loadImage()
            } else {
                let storyboard = UIStoryboard(name: "NCScan", bundle: nil)
                let controller = storyboard.instantiateInitialViewController()!

                controller.modalPresentationStyle = UIModalPresentationStyle.pageSheet
                self.viewController?.present(controller, animated: true, completion: nil)
            }
        }
    }

    func documentCameraViewControllerDidCancel(_ controller: VNDocumentCameraViewController) {
        controller.dismiss(animated: true, completion: nil)
    }
}