//
//  KMResourceDownloadManager.swift
//  PDF Reader Pro
//
//  Created by lizhe on 2023/8/29.
//

import Cocoa
import Foundation
import ZipArchive // 请确保已导入 SSZipArchive 或其他合适的解压库

//#if DEBUG
//let xmlURLString = "http://test-pdf-pro.kdan.cn:3021/downloads/DocumentAI.xml"
//#else
//let xmlURLString = "https://www.pdfreaderpro.com/downloads/DocumentAI.xml"
//#endif
//let documentAIString = "http://test-pdf-pro.kdan.cn:3021/downloads/DocumentAI.bundle.zip"
let xmlURLString = KMLightMemberConfig().kResourceServerURL
let kResourcePath = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first?.path

enum KMResourceDownloadState {
    case none
    case unzipFailed
    case moveFailed
    case success
    case retry
}

class KMResourceDownloadManager: NSObject {
    static let manager = KMResourceDownloadManager()
    
    var downloadTask: URLSessionDownloadTask?
    var progressBlock: ((Double) -> Void)?
    var downloadResultBlock: ((Bool, KMResourceDownloadState) -> Void)?
    var reachabilityAlert: NSAlert?
    
    
    func downloadFramework(progress: @escaping (Double) -> Void, result: @escaping (Bool, KMResourceDownloadState) -> Void) {
        self.progressBlock = progress
        self.downloadResultBlock = result
        
        KMRequestServer.requestServer.reachabilityStatusChange { [weak self] status in
            if status == .notReachable {
                KMPrint("无网络")
                self?.downloadTask?.cancel()
                self?.downloadTask = nil
                self?.downloadResultBlock?(false, .none)
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.2, execute: { [weak self] in
                    if self?.reachabilityAlert == nil {
                        self?.reachabilityAlert = NSAlert()
                        self?.reachabilityAlert?.messageText = NSLocalizedString("Network Disconnected", comment: "")
                        self?.reachabilityAlert?.informativeText = NSLocalizedString("Please connect to the internet and download again.", comment: "")
                        self?.reachabilityAlert?.addButton(withTitle: NSLocalizedString("Retry", comment: ""))
                        self?.reachabilityAlert?.addButton(withTitle: NSLocalizedString("Cancel", comment: ""))
                        var window = NSWindow.currentWindow()
                        if window != nil {
                            self?.reachabilityAlert?.beginSheetModal(for: window) { result in
                                if (result == .alertSecondButtonReturn) {
                                    self?.reachabilityAlert = nil

                                    self?.cancelDownload()
                                } else if result == .alertFirstButtonReturn {
                                    self?.reachabilityAlert = nil
                                    self?.downloadResultBlock?(false, .retry)
                                    self?.cancelDownload()
                                    return
                                }
                                self?.reachabilityAlert = nil
                            }
                        } else {
                            self?.reachabilityAlert = nil
                        }
                    } else {
                        self?.reachabilityAlert = nil
                    }
                })
            } else {
                KMPrint("有网络")
            }
        }
        
        if self.downloadTask == nil {
            self.downloadXML { [unowned self] content in
                let urlString = self.dealXML(content: content)
    //            let urlString = "http://test-pdf-pro.kdan.cn:3021/downloads/DocumentAI.bundle.zip"
                if let url = URL(string: urlString) {
                    let configuration = URLSessionConfiguration.default
                    let session = URLSession(configuration: configuration, delegate: self, delegateQueue: nil)
                    let downloadTask = session.downloadTask(with: url)
                    downloadTask.resume()
                    self.downloadTask = downloadTask
                } else {
                    dealDownloadResult(isSuccess: false, state: .none)
                }
            }
        } else {
            dealDownloadResult(isSuccess: false, state: .none)
        }
    }
    
    func documentAIBundleExists() -> Bool {
        let filePath: String = kResourcePath! + "/DocumentAI.bundle"
        let fileManager = FileManager.default
        debugPrint(filePath)
        debugPrint(FileManager.default.temporaryDirectory.appendingPathComponent("XMLResources"))
        let exists = fileManager.fileExists(atPath: filePath as String)
        if exists {
            self.checkDocumentAIVersion()
        } else {
            self.removeXml()
        }
        return exists
    }
    
    func cancelDownload() {
        downloadTask?.cancel()
        downloadTask = nil
        progressBlock = nil
        downloadResultBlock = nil
    }
    
    //结果处理
    func dealDownloadResult(isSuccess: Bool, state: KMResourceDownloadState) {
        DispatchQueue.main.async {
            self.downloadResultBlock?(isSuccess, state)
            self.cancelDownload()
        }
    }
    
    func checkDocumentAIVersion() {
        self.downloadXML { [unowned self] content in
            let urlString = self.dealXML(content: content)
            if urlString.count != 0 {
                let filePath: String = kResourcePath! + "/DocumentAI.bundle"
                try?FileManager.default.removeItem(atPath: filePath)
                
                self.removeXml()
            }
        }
    }
}

extension KMResourceDownloadManager: XMLParserDelegate {
    func downloadXML(completion: @escaping (_ content: String) -> Void) {
        // 将 URL 字符串转换为 URL 对象
        if let xmlURL = URL(string: xmlURLString) {
            // 创建一个 URL 请求
            let request = URLRequest(url: xmlURL)
            // 创建一个 URLSession
            let session = URLSession.shared
            // 创建一个数据任务来下载 XML 数据
            let task = session.dataTask(with: request) { (data, response, error) in
                if let error = error {
                    // 处理下载错误
                    print("Error: \(error)")
                } else if let data = data {
                    // 成功下载 XML 数据
                    if let xmlString = String(data: data, encoding: .utf8) {
                        // 将 XML 数据打印出来（你可以进一步处理它，比如解析它）
                        print("XML Data: \(xmlString)")
                        completion(xmlString)
                    }
                }
            }
            
            // 启动任务
            task.resume()
        } else {
            // URL 字符串无效，进行错误处理
            print("Invalid URL")
            completion("")
        }
    }
    
    func removeXml() {
        let fileManager = FileManager.default
        let folderURL = fileManager.temporaryDirectory.appendingPathComponent("XMLResources")
        let xmlURL = folderURL.appendingPathComponent("DocumentAI.xml")
        try?FileManager.default.removeItem(at: xmlURL)
    }
    
    func dealXML(content: String) -> String {
        // 1. 定义 XML 内容，包括版本号
//        let xmlContent = """
//        <root>
//            <version>1.2.0</version>
//            <minVersion>1.4.0</minVersion> <!-- 最底支持版本参数，本地APP版本小于这个版本将不会更新 -->
//            <resourceURL>http://test-pdf-pro.kdan.cn:3021/downloads/DocumentAI.bundle.zip</resourceURL>
//        </root>
//        """
        let xmlContent = content

        // 2. 创建目标文件夹（如果不存在的话）
        let fileManager = FileManager.default
        let folderURL = fileManager.temporaryDirectory.appendingPathComponent("XMLResources")
        try? fileManager.createDirectory(at: folderURL, withIntermediateDirectories: true, attributes: nil)

        // 3. 将 XML 内容写入文件
        let xmlURL = folderURL.appendingPathComponent("TempDocumentAI.xml")
        try? xmlContent.write(to: xmlURL, atomically: true, encoding: .utf8)

        // 4. 解析 XML 并比较版本号
        // 创建 XMLParser 实例
        var localVersion = "0.0"
        var appVersion = "1.0.0"
        
        if let xmlData = try? Data(contentsOf: self.fetchXMLURL()) {
            let xmlParser = XMLParser(data: xmlData)
            let xmlDelegate = XMLDelegate()
            xmlParser.delegate = xmlDelegate
            
            if xmlParser.parse() {
                localVersion = xmlDelegate.version ?? "1.0.0"
            }
        }
        
        // 从捆绑包的 Info.plist 文件中获取版本号
        if let version = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String {
            appVersion = version
            print("应用程序版本号：\(appVersion)")
        } else {
            print("无法获取应用程序版本号。")
        }
                
        if let xmlData = try? Data(contentsOf: xmlURL) {
            let xmlParser = XMLParser(data: xmlData)
            let xmlDelegate = XMLDelegate()
            xmlParser.delegate = xmlDelegate
            
            if xmlParser.parse() {
                // Parsing was successful
                if let xmlVersion = xmlDelegate.version {
                    if xmlVersion > localVersion {
                        if let minVersion = xmlDelegate.minVersion {
                            if appVersion >= minVersion {
                                // 下载资源的逻辑
                                let resourceURL = xmlDelegate.resourceURL
                                print("Download resource from \(resourceURL)")
                                return resourceURL ?? ""
                            } else {
                                print("No need to download resources. Already up to date.")
                            }
                        }
                    } else {
                        print("No need to download resources. Already up to date.")
                    }
                }
            } else {
                // Parsing failed
            }
        } else {
            // Error handling for loading XML data
        }
        return ""
    }
    
    func fetchXMLURL() -> URL {
        // 2. 创建目标文件夹（如果不存在的话）
        let fileManager = FileManager.default
        let folderURL = fileManager.temporaryDirectory.appendingPathComponent("XMLResources")
        try? fileManager.createDirectory(at: folderURL, withIntermediateDirectories: true, attributes: nil)

        // 3. 将 XML 内容写入文件
        let xmlURL = folderURL.appendingPathComponent("DocumentAI.xml")
        return xmlURL
    }
    
    func writeXML(content: String) {
        let xmlURL = self.fetchXMLURL()
        try? content.write(to: xmlURL, atomically: true, encoding: .utf8)
    }
    
    func xmlResourceDownloadSuccess() {
        let fileManager = FileManager.default
        let folderURL = fileManager.temporaryDirectory.appendingPathComponent("XMLResources")
        let xmlURL = folderURL.appendingPathComponent("DocumentAI.xml")
        let tempXmlURL = folderURL.appendingPathComponent("TempDocumentAI.xml")
        try?fileManager.removeItem(at: xmlURL)
        
        do {
           // 尝试更改文件名称
            try fileManager.moveItem(atPath: tempXmlURL.path, toPath: xmlURL.path)
           print("文件重命名成功：\(xmlURL.path)")
        } catch {
           // 处理重命名失败的错误
           print("文件重命名失败：\(error)")
        }
    }
}

extension KMResourceDownloadManager {
    //MARK: 解压
    func unzipFramework(at zipURL: URL, to destinationPath: String) {
        let fileManager = FileManager.default
        var success = false

        if zipURL.pathExtension == "zip" {
            success = SSZipArchive.unzipFile(atPath: zipURL.path, toDestination: destinationPath)
        } else {
            // 如果是其他类型的压缩文件，可以使用其他解压库
            // success = YourCustomUnzipLibrary.unzipFile(atPath: zipURL.path, toDestination: destinationPath)
        }
        
        if success {
            print("File unzipped successfully!")
            try? fileManager.removeItem(at: zipURL)
        } else {
            print("Failed to unzip file.")
            dealDownloadResult(isSuccess: false, state: .unzipFailed)
        }
    }
    
    func loadFramework(destinationPath: String) {
        let fileManager = FileManager.default
        let bundlePath = destinationPath + "/DocumentAI.bundle"
        
        if fileManager.fileExists(atPath: bundlePath) {
            if let bundle = Bundle(path: bundlePath) {
                // 使用 framework 中的代码和资源
                // 例如：bundle.load()
                print("Framework loaded successfully!")
            } else {
                print("Error loading bundle.")
                dealDownloadResult(isSuccess: false, state: .none)
            }
        } else {
            dealDownloadResult(isSuccess: false, state: .none)
        }
    }
}

extension KMResourceDownloadManager: URLSessionDelegate, URLSessionDownloadDelegate {
    //MARK: 网络下载
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
        let progress = Double(totalBytesWritten) / Double(totalBytesExpectedToWrite)
        print("Download progress: \(progress)")
        progressBlock?(progress)
    }
    
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        guard let destinationPath = kResourcePath else {
            return
        }
        
        let fileManager = FileManager.default
        let destinationURL = URL(fileURLWithPath: destinationPath).appendingPathComponent("DocumentAI.bundle.zip")
        
        do {
            try fileManager.moveItem(at: location, to: destinationURL)
            print("Framework downloaded and installed successfully!")
            unzipFramework(at: destinationURL, to: destinationPath)
            dealDownloadResult(isSuccess: true, state: .success)
            self.xmlResourceDownloadSuccess()
        } catch {
            print("Failed to move framework: \(error)")
            dealDownloadResult(isSuccess: false, state: .moveFailed)
        }
    }
}


// 5. 定义一个 XML 解析器的代理类
class XMLDelegate: NSObject, XMLParserDelegate {
    var currentElement: String = ""
    var version: String?
    var minVersion: String?
    var resourceURL: String?
    
    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
        currentElement = elementName
    }
    
    func parser(_ parser: XMLParser, foundCharacters string: String) {
        if currentElement == "version" {
            if version == nil {
                version = string
            }
        } else if currentElement == "resourceURL" {
            if resourceURL == nil {
                resourceURL = string
            }
        } else if currentElement == "minVersion" {
            if minVersion == nil {
                minVersion = string
            }
        }
    }
}