//
//  KMImageToPDFMethod.swift
//  PDF Reader Pro
//
//  Created by kdanmobile on 2023/10/26.
//

import Foundation

let kImageToPDFFolderPath = kTempSavePath?.stringByAppendingPathComponent("ImageToPDF")

@objc(KMImageToPDFMethod)
protocol KMImageToPDFMethodDelegate: AnyObject {
    func imageToPDFMethod(_ method: KMImageToPDFMethod, progress: Float)
}

typealias ImageToPDFResultBlock = (_ savePath: String, _ errorArr: Array<Any>, _ errorOCRArray: Array<Any>) -> Void

class KMImageToPDFMethod: NSObject, KMGOCRManagerDelegate {
    var imageTopdfDelegate: KMImageToPDFMethodDelegate?
    var password: String = ""
    var convertIndex: Int = 0
    var photoArray: Array<Any>?
    var errorArray: NSMutableArray!
    var isOCR = false
    var isCreatPDF = false
    var isMerge = false
    var isSaveAsText = false
    
    var results: NSMutableArray!
    var fileSavePath = ""
    var OCRResultString = ""
    
    var completeBlock: ImageToPDFResultBlock?
    
    var errorOCRArray: NSMutableArray!
    
    var appendPDF: CPDFDocument?
    
    override init() {
        super.init()
        if !FileManager.default.fileExists(atPath: kImageToPDFFolderPath ?? "") {
            try? FileManager.default.createDirectory(at: URL(fileURLWithPath: kImageToPDFFolderPath ?? "") , withIntermediateDirectories: false, attributes: nil)
        }
        self.errorArray = NSMutableArray()
        self.results = NSMutableArray()
        self.errorOCRArray = NSMutableArray()
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
        imageTopdfDelegate = nil
    }
    
    func exportPDFFile(fileArray: Array<Any>, savePath: String, isOCR: Bool, isCreatPDF: Bool, isMerge: Bool, isSaveAsText: Bool, complete: @escaping ImageToPDFResultBlock) {
        self.convertIndex = 0
        self.photoArray = fileArray
        self.isOCR = isOCR
        self.isCreatPDF = isCreatPDF
        self.isMerge = isMerge
        self.isSaveAsText = isSaveAsText
        self.fileSavePath = savePath
        self.completeBlock = complete
        self.OCRResultString = ""
        self.errorArray.removeAllObjects()
        self.errorOCRArray.removeAllObjects()
        
        if !isCreatPDF {
            appendPDF = CPDFDocument(url: URL(fileURLWithPath: savePath))
            if ((appendPDF?.unlock(withPassword:self.password)) != nil) {
                
            }
        }
        
        if isOCR {
            let languages = KMGOCRManager.default().selectedLanguages.value(forKeyPath: KMGOCRLanguageCodeKey) as! [Any]
            var images = [AnyObject]()
            for i in 0 ..< (photoArray?.count ?? 0) {
                let filePaht: String = photoArray?[i] as! String
                if filePaht.count > 0 && FileManager.default.fileExists(atPath: filePaht) {
                    let image = NSImage(contentsOfFile: filePaht)
                    images.append(image!)
                } else {
                    self.errorArray.add(filePaht)
                }
            }
            if images.count < 1 {
                self.completeBlock?("", self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
                return
            }
            let plan = UserDefaults.standard.integer(forKey: "KMOCRCurrentPlanKey")
            if plan == 0 {
                KMGOCRManager.default().ocrType = .google
            } else {
                KMGOCRManager.default().ocrType = .apple
            }
            KMGOCRManager.default().delegate = self
            KMGOCRManager.default().recognitionImages(images as! [NSImage], withLanguages: languages)
        } else {
            if isMerge {
                NotificationCenter.default.addObserver(self, selector: #selector(pdfDocumentPageWrite(notification:)), name: NSNotification.Name("PDFDocumentDidBeginPageWriteNotification"), object: nil)
                self.imageToPDFFile_MergeToOneFile(path: savePath, complete: complete)
            } else {
                self.imageToPDFFile_SeparateToFiles(path: savePath, complete: complete)
            }
        }
    }
    
    func imageToPDFFile_MergeToOneFile(path: String, complete: @escaping ImageToPDFResultBlock) {
        var pdf: CPDFDocument?
        var newPath: String = ""
        if self.isCreatPDF {
            pdf = CPDFDocument()
            newPath = path.stringByAppendingPathComponent("Untitled").stringByAppendingPathExtension("pdf")
            newPath = getUniqueFilePath(newPath)
        } else {
            newPath = path
            pdf = self.appendPDF
        }
        
        for pageCount in 0..<(photoArray?.count ?? 0) {
            var isDir: ObjCBool = false
            let filePath = photoArray?[pageCount] as! String
            if FileManager.default.fileExists(atPath: filePath, isDirectory: &isDir) && !isDir.boolValue {
                let image = NSImage(contentsOfFile: filePath)!
                _ = pdf?.km_insertPage(image.size, withImage: filePath, at: pdf?.pageCount ?? 0)
            }
        }
        
        var isSucceed = false
        if (pdf?.pageCount ?? 0) < 1 {
            
        } else {
            var options: [CPDFDocumentWriteOption : Any] = [:]
            if pdf!.isEncrypted {
                options.updateValue(password, forKey: .userPasswordOption)
                options.updateValue(password, forKey: .userPasswordOption)
                isSucceed = pdf?.write(toFile: newPath, withOptions: options) ?? false
            } else {
                isSucceed = pdf?.write(toFile: newPath) ?? false
            }
        }
        
        if !isSucceed {
            self.errorArray.add((newPath as NSString).lastPathComponent)
        }
        
        DispatchQueue.main.async {
            complete(newPath, self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
        }
        
    }
    func imageToPDFFile_SeparateToFiles(path: String, complete: @escaping(ImageToPDFResultBlock)) {
        if convertIndex >= photoArray?.count ?? 0 {
            complete(path, Array<Any>(), errorOCRArray as! Array<Any>)
            return
        }
        let filePath: String = photoArray?[convertIndex] as! String
        let savePath = path
        var isDir: ObjCBool = false
        if FileManager.default.fileExists(atPath: filePath , isDirectory: &isDir) && !isDir.boolValue {
            let model = KMImageModel(filepath: filePath )
            let tString = model.photoName.deletingPathExtension.lastPathComponent//model.photoName.deletingPathExtension
            
            var newpath = path.stringByAppendingPathComponent(tString).stringByAppendingPathExtension("pdf")
            newpath = getUniqueFilePath(newpath)
            
            let pdf = CPDFDocument()
            
            if let imag = NSImage(contentsOfFile: filePath ) {
                _ = pdf?.km_insertPage(imag.size, withImage: filePath , at: pdf?.pageCount ?? 0)
            }
            
//            DispatchQueue.global().async {
                var isSucceed = false
                
                isSucceed = pdf?.write(toFile: newpath) ?? false
                var pre: Float = 0
                if self.photoArray?.count ?? 0 > 0{
                    pre = Float(self.convertIndex + 1) / Float(self.photoArray?.count ?? 1)
                }else{
                    pre = 0
                }
                
                if !isSucceed {
                    self.errorArray.add(filePath)
                }
                
                if self.convertIndex < (self.photoArray?.count ?? 0) - 1 {
                    self.convertIndex += 1
                    self.imageToPDFFile_SeparateToFiles(path: savePath, complete: complete)
                    
                    DispatchQueue.main.async {
                        self.imageTopdfDelegate?.imageToPDFMethod(self, progress: pre)
                    }
                } else {
                    DispatchQueue.main.async {
                        complete(newpath, self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
                    }
                }
//            }
            
        } else {
            if convertIndex < (photoArray?.count ?? 0) - 1 {
                self.convertIndex += 1
                self.imageToPDFFile_SeparateToFiles(path: savePath, complete: complete)
            } else {
                DispatchQueue.main.async {
                    complete(path, self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
                }
            }
        }
    }
    
    func getUniqueFilePath(_ filePath: String) -> String {
        var i = 0
        var uniqueFilePath = filePath
        let fileManager = FileManager.default
        while fileManager.fileExists(atPath: uniqueFilePath) {
            i += 1
            let path = String(format: "%@(%d)", filePath.deletingPathExtension,i)
            uniqueFilePath = path.stringByAppendingPathExtension(filePath.pathExtension)
        }
        
        return uniqueFilePath
    }
    
    @objc func pdfDocumentPageWrite(notification: NSNotification) {
        if ((notification.userInfo?.isEmpty) != nil) { return }
        let num = notification.userInfo!["PDFDocumentPageIndex"] as! NSNumber
        let pdfDocument = notification.object as! CPDFDocument
        
        let pre = Float(num.intValue + 1) / (Float(pdfDocument.pageCount) * 1.0)
        DispatchQueue.main.async {
            self.imageTopdfDelegate?.imageToPDFMethod(self, progress: pre)
        }
    }
    
    //MARK: KMGOCRManagerDelegate
    func gocrManagerDidStartOCR(_ manager: KMGOCRManager!) {
        
    }
    func gocrManagerDidFinishOCR(_ manager: KMGOCRManager!) {
        
    }
    func gocrManager(_ manager: KMGOCRManager!, didCancelOCRImageAt index: Int) {
        
    }
    func gocrManager(_ manager: KMGOCRManager!, didStartOCRImageAt index: Int) {
        
    }
    func gocrManager(_ manager: KMGOCRManager!, didFinishOCRImageAt index: Int, results: [KMGOCRResult]!) {
        if (results != nil) {
            self.dealWithResults(results, OCRImageAtIndex: index)
        }
    }
    func gocrManager(_ manager: KMGOCRManager!, didFailureOCRImageAt index: Int, error: Error!) {
        let results = Array<KMGOCRResult>()
        self.errorOCRArray.add(self.photoArray?[index] as Any)
        self.dealWithResults(results, OCRImageAtIndex: index)
    }
    
    
    func dealWithResults(_ results: [KMGOCRResult]?, OCRImageAtIndex index: Int) {
        if isOCR {
            if isMerge {
                self.results.add(results as Any)
                var key = index
                if isCreatPDF {
                    key = Int((self.appendPDF?.pageCount ?? 0) + UInt(index))
                }
                var contents = ""
                if OCRResultString.count > 0 {
                    contents = self.OCRResultString
                }
                var str: String = ""
                if results!.count > 0 {
                    guard let firstResult: KMGOCRResult = results?.first else {
                        return
                    }
                    str = firstResult.text
                }
                
                contents = contents + "\n"
                contents = contents + "Page" + "\(key + 1)"
                contents = contents + "\n----------\n"
                contents = contents + str
                self.OCRResultString = contents
                if isCreatPDF {
                    if index >= (photoArray?.count ?? 0) - 1 {
                        var savePath = self.fileSavePath.stringByAppendingPathComponent("Untitled OCR").stringByAppendingPathExtension("pdf")
                        savePath = self.getUniqueFilePath(savePath)
                        if self.isSaveAsText {
                            var savetextPath = self.fileSavePath.stringByAppendingPathComponent("Untitled OCR").stringByAppendingPathExtension("txt")
                            savetextPath = self.getUniqueFilePath(savetextPath)
                            try? self.OCRResultString.write(to: URL(fileURLWithPath: savetextPath), atomically: true, encoding: .utf8)
                            NSWorkspace.shared.selectFile(savetextPath, inFileViewerRootedAtPath: "")
                        }
                        KMGOCRManager.default().createPDFFile(savePath, imagePaths: self.photoArray, results: (self.results as! [Any]), scale: 1.0)
                        DispatchQueue.main.async {
                            self.completeBlock?(savePath, self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
                        }
                    } else {
                        let pre = Float(index + 1) / (Float(photoArray?.count ?? 0) * 1.0)
                        DispatchQueue.main.async {
                            self.imageTopdfDelegate?.imageToPDFMethod(self, progress: pre)
                        }
                    }
                } else {
                    if index >= (photoArray?.count ?? 0) - 1 {
                        var savePath = kImageToPDFFolderPath?.stringByAppendingPathComponent("Untitled OCR").stringByAppendingPathExtension("pdf")
                        KMGOCRManager.default().createPDFFile(savePath, imagePaths: self.photoArray, results: (self.results as! [Any]), scale: 1.0)
                        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 3){
                            if FileManager.default.fileExists(atPath: savePath ?? "") {
                                let appPDF = self.appendPDF
                                let newPdf = CPDFDocument.init(url: URL(fileURLWithPath: savePath ?? ""))
                                for i in 0 ..< (newPdf?.pageCount ?? 0) {
                                    let page = newPdf?.page(at: i)
                                    appPDF?.insertPageObject(page, at: appPDF?.pageCount ?? 0)
                                }
                                var isSuccessfully = false
                                let attributes = NSMutableDictionary(dictionary: appPDF!.documentAttributes()!, copyItems: true)
                                if ((appPDF?.isEncrypted) != nil) {
                                    attributes.setValue(self.password, forKey: (kCGPDFContextUserPassword as NSString) as String)
                                    attributes.setValue(self.password, forKey: (kCGPDFContextOwnerPassword as NSString) as String)
                                    isSuccessfully = appPDF?.write(toFile: self.fileSavePath, withOptions: (attributes as? [CPDFDocumentWriteOption : Any])) ?? false
                                } else {
                                    isSuccessfully = appPDF?.write(toFile: self.fileSavePath) ?? false
                                }
                                if self.isSaveAsText {
                                    var savetextPath = kImageToPDFFolderPath?.stringByAppendingPathComponent("Untitled OCR").stringByAppendingPathExtension("txt")
                                    savetextPath = self.getUniqueFilePath(savetextPath ?? "")
                                    try? self.OCRResultString.write(to: URL(fileURLWithPath: savetextPath ?? ""), atomically: true, encoding: .utf8)
                                    NSWorkspace.shared.selectFile(savetextPath, inFileViewerRootedAtPath: "")
                                }
                                try? FileManager.default.removeItem(atPath: savePath ?? "")
                                DispatchQueue.main.async {
                                    self.completeBlock?(self.fileSavePath, self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
                                }
                            }
                        }
                    }else{
                        let pre = Float(index + 1) / (Float(photoArray?.count ?? 0) * 1.0)
                        DispatchQueue.main.async {
                            self.imageTopdfDelegate?.imageToPDFMethod(self, progress: pre)
                        }
                    }
                }
            } else {
                let filePath: String = photoArray?[index] as! String
                let model = KMImageModel(filepath: filePath)
                let tString = model.photoName.deletingPathExtension.lastPathComponent
                var savePath = fileSavePath.stringByAppendingPathComponent(tString).stringByAppendingPathExtension("pdf")
                savePath = getUniqueFilePath(savePath)
                KMGOCRManager.default().createPDFFile(savePath, imagePaths: [filePath], results: [results as Any], scale: 1.0)
                var tFileName = fileSavePath.stringByAppendingPathComponent(tString).stringByAppendingPathExtension("txt")
                tFileName = getUniqueFilePath(tFileName)
                if isSaveAsText {
                    var string: String = ""
                    if results!.count > 0 {
                        guard let firstResult: KMGOCRResult = results?.first else {
                            return
                        }
                        string = firstResult.text
                        try? string.write(toFile: tFileName, atomically: true, encoding: .utf8)
                    }
                }
                if index < (photoArray?.count ?? 0) - 1 {
                    let pre = Float(index + 1) / Float(photoArray?.count ?? 1)
                    DispatchQueue.main.async {
                        self.imageTopdfDelegate?.imageToPDFMethod(self, progress: pre)
                    }
                } else {
                    DispatchQueue.main.async {
                        self.completeBlock?(savePath, self.errorArray as! Array<Any>, self.errorOCRArray as! Array<Any>)
                    }
                }
            }
        }
    }
    
    static func supportedImageTypes() -> [String] {
        return ["jpg", "cur", "bmp", "jpeg", "gif", "png", "tiff", "tif", "ico", "icns", "tga", "psd", "eps", "hdr", "jp2", "jpc", "pict", "sgi"]
    }
    
}