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,
     missingEx: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,
            missingEx: missingEx,
            cacheDirectory: cacheDirectory,
            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
    }
    

}