TSSmalCoacopods/TSSmalCoacopods/Classes/Tool/TSCommonTool/TSCommonTool+MultDown.swift

//
//  MultiTaskDown.swift
//  Pods
//
//  Created by 100Years on 2025/3/17.
//

public extension TSCommonTool {
    
    //    /// 多任务下载并缓存文件，依据 URL 的后缀名动态设置文件名
    //    /// - Parameters:
    //    ///   - url: 文件的 URL 地址
    //    ///   - completion: 完成回调，返回本地缓存路径或错误
    //    public static func multidownloadAndCacheFile(
    //        from urlString: String,
    //        fileEx:String? = nil,
    //        cacheDirectory:String = "cacheAll",
    //        progressHandler: @escaping (Double) -> Void,
    //        completion: @escaping (String?, Error?) -> Void) -> TSMultiTaskDownloader?
    //    {
    //
    //        guard let url = URL(string: urlString) else{
    //            completion(nil, NSError(domain: "url null", code: 0))
    //            return nil
    //        }
    //
    //
    //        if !urlString.contains("http") && urlString.contains("/"){
    //            completion(urlString.fillCachePath, nil)
    //            return nil
    //        }
    //
    //        let fileManager = FileManager.default
    //
    //        // 获取缓存目录下的 `cacheVideo` 文件夹路径
    //        let cachesDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first!
    //        let cacheVideoDirectory = cachesDirectory.appendingPathComponent(cacheDirectory)
    //
    //        // 创建 `cacheVideo` 文件夹（如果不存在）
    //        if !fileManager.fileExists(atPath: cacheVideoDirectory.path) {
    //            do {
    //                try fileManager.createDirectory(at: cacheVideoDirectory, withIntermediateDirectories: true, attributes: nil)
    //            } catch {
    //                completion(nil, error)
    //                return nil
    //            }
    //        }
    //
    //        var fileName = url.path.md5
    //
    //        // 使用 URL 的 MD5 哈希值作为缓存文件名，附加 URL 的后缀名
    //        var fileExtension = fileEx
    //        fileExtension = fileExtension ?? (url.pathExtension.isEmpty ? "" : url.pathExtension)
    //        if let fileExtension = fileExtension,fileExtension.count > 0 {
    //            fileName = url.path.md5 + ".\(fileExtension)"
    //        }
    //
    //        let cachedFileURL = cacheVideoDirectory.appendingPathComponent(fileName)
    //
    //        //检查文件是否已存在于缓存中
    //        if fileManager.fileExists(atPath: cachedFileURL.path) {
    //            print("文件已存在于缓存中: \(cachedFileURL)")
    //            completion(cachedFileURL.path, nil)
    //            return nil
    //        }
    //
    //
    //        let downloader = TSMultiTaskDownloader.shared
    //
    //        let url1 = URL(string: "https://example.com/file1.zip")!
    //        let url2 = URL(string: "https://example.com/file2.zip")!
    //
    //        downloader.downloadFile(from: url, progressHandler: { progress in
    //            print("Download progress for file1: \(progress * 100)%")
    //            progressHandler(progress)
    //        }, completionHandler: { tempFileURL, error in
    //            if let error = error {
    //                DispatchQueue.main.async {
    //                    completion(nil, error)
    //                }
    //                return
    //            }
    //
    //            guard let tempFileURL = tempFileURL else {
    //                DispatchQueue.main.async {
    //                    completion(nil, NSError(domain: "DownloadError", code: -1, userInfo: [NSLocalizedDescriptionKey: "临时文件路径不存在"]))
    //                }
    //                return
    //            }
    //
    //            do {
    //                if fileManager.fileExists(atPath: cachedFileURL.path) {
    //                    try fileManager.removeItem(atPath:cachedFileURL.path)
    //                    dePrint("下载成功,移除已有的旧文件: \(cachedFileURL)")
    //                }
    //                try fileManager.moveItem(at: tempFileURL, to: cachedFileURL)
    //                dePrint("文件下载并缓存成功: \(cachedFileURL)")
    //                DispatchQueue.main.async {
    //                    completion(cachedFileURL.path, nil)
    //                }
    //            } catch {
    //                dePrint("文件下载成功,但失败:\(error)")
    //                DispatchQueue.main.async {
    //                    completion(nil, error)
    //                }
    //            }
    //        })
    //
    //        return downloader
    //    }
    
    /// 多任务下载并缓存文件，依据 URL 的后缀名动态设置文件名
    /// - Parameters:
    ///   - url: 文件的 URL 地址
    ///   - completion: 完成回调，返回本地缓存路径或错误
    public static func multidownloadAndCacheFile(
        from urlString: String,
        fileEx:String? = nil,
        cacheDirectory:String = "cacheAll",
        progressHandler: @escaping (Double) -> Void,
        completion: @escaping (String?, Error?) -> Void) -> TSMultiTaskDownloader?
    {
        
        guard let url = URL(string: urlString) else{
            completion(nil, NSError(domain: "url null", code: 0))
            return nil
        }
        
    
        guard let cachedFileURL = checkURLString(
            from: urlString,
            fileEx: fileEx,
            cacheDirectory: cacheDirectory,
            progressHandler: progressHandler,
            completion: completion
        ) else {
            return nil
        }
        
        let fileManager = FileManager.default
        //检查文件是否已存在于缓存中
        if fileManager.fileExists(atPath: cachedFileURL.path) {
            print("文件已存在于缓存中: \(cachedFileURL)")
            completion(cachedFileURL.path, nil)
            return nil
        }
        
        
        let downloader = TSMultiTaskDownloader.shared
        downloader.downloadFile(from: url, progressHandler: { progress in
            print("Download progress for file1: \(progress * 100)%")
            progressHandler(progress)
        }, completionHandler: { tempFileURL, error in
            if let error = error {
                DispatchQueue.main.async {
                    completion(nil, error)
                }
                return
            }
            
            guard let tempFileURL = tempFileURL else {
                DispatchQueue.main.async {
                    completion(nil, NSError(domain: "DownloadError", code: -1, userInfo: [NSLocalizedDescriptionKey: "临时文件路径不存在"]))
                }
                return
            }
            
            do {
                if fileManager.fileExists(atPath: cachedFileURL.path) {
                    try fileManager.removeItem(atPath:cachedFileURL.path)
                    dePrint("下载成功,移除已有的旧文件: \(cachedFileURL)")
                }
                try fileManager.moveItem(at: tempFileURL, to: cachedFileURL)
                dePrint("文件下载并缓存成功: \(cachedFileURL)")
                DispatchQueue.main.async {
                    completion(cachedFileURL.path, nil)
                }
            } catch {
                dePrint("文件下载成功,但失败:\(error)")
                DispatchQueue.main.async {
                    completion(nil, error)
                }
            }
        })
        
        return downloader
    }
    
    //检查 url 对不对
    public static func checkURLString(
        from urlString: String,
        fileEx:String? = nil,
        cacheDirectory:String = "cacheAll",
        progressHandler:((Double) -> Void)? = nil,
        completion:((String?, Error?) -> Void)? = nil
    )->URL?
    {
        guard let url = URL(string: urlString) else{
            completion?(nil, NSError(domain: "url null", code: 0))
            return nil
        }
        
        
        if !urlString.contains("http") && urlString.contains("/"){
            completion?(urlString.fillCachePath, nil)
            return nil
        }
        
        let fileManager = FileManager.default
        
        // 获取缓存目录下的 `cacheVideo` 文件夹路径
        let cachesDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first!
        let cacheVideoDirectory = cachesDirectory.appendingPathComponent(cacheDirectory)
        
        // 创建 `cacheVideo` 文件夹（如果不存在）
        if !fileManager.fileExists(atPath: cacheVideoDirectory.path) {
            do {
                try fileManager.createDirectory(at: cacheVideoDirectory, withIntermediateDirectories: true, attributes: nil)
            } catch {
                completion?(nil, error)
                return nil
            }
        }
        
        var fileName = url.path.md5
        
        // 使用 URL 的 MD5 哈希值作为缓存文件名，附加 URL 的后缀名
        var fileExtension = fileEx
        fileExtension = fileExtension ?? (url.pathExtension.isEmpty ? "" : url.pathExtension)
        if let fileExtension = fileExtension,fileExtension.count > 0 {
            fileName = url.path.md5 + ".\(fileExtension)"
        }
        
        let cachedFileURL = cacheVideoDirectory.appendingPathComponent(fileName)
        return cachedFileURL

    }
    
    //获取 urlstring 本地的缓存 url path
    public static func getCachedURLString(
        from urlString: String,
        fileEx:String? = nil,
        cacheDirectory:String = "cacheAll")->URL?{
        
        if let cachedFileURL = checkURLString(
            from: urlString,
            fileEx: fileEx,
            cacheDirectory: cacheDirectory
        ){
            //检查文件是否已存在于缓存中
            if FileManager.default.fileExists(atPath: cachedFileURL.path) {
                print("文件已存在于缓存中: \(cachedFileURL)")
                return cachedFileURL
            }
        }
        
        return nil
    }
}