import Foundation

final class DownloadManager {
    private let urlSession: URLSession

    init() {
        let configuration = URLSessionConfiguration.default
        urlSession = URLSession(configuration: configuration)
    }

    func download(from url: URL, to localUrl: URL, completion: @escaping (Error?) -> Void) {
        let task = urlSession.downloadTask(with: url) { tempLocalUrl, _, error in
            if let tempLocalUrl = tempLocalUrl, error == nil {
                do {
                    try FileManager.default.copyItem(at: tempLocalUrl, to: localUrl)
                    completion(nil)
                } catch let writeError {
                    completion(writeError)
                }
            } else {
                completion(error)
            }
        }
        task.resume()
    }
}