DownloadModel.swift

final class Download {
    
    weak var delegate: DownloadDelegate?
    var url: String?
    var downloadTask: URLSessionDownloadTask?
    
    var progress: Float = 0.0 {
        didSet {
            updateProgress()
            if progress == 1 {
                downloadTask = nil
                print("File is done")
            }
        }
    }
    
    // Gives float for download progress - for delegate
    
    private func updateProgress() {
        if let task = downloadTask,
            let url = url {
            delegate?.downloadProgressUpdated(for: progress)
        }
    }
    
    init(url: String) {
        self.url = url
    }
}