// CSE 143, Winter 2009, Marty Stepp
// This client program uses the Downloader class to download a web page.
// It can use either a Downloader or TallyDownloader object.

import java.io.*;
import java.net.*;
import java.util.*;

public class DownloadMain {
    public static void main(String[] args) {
        // prompt for input URL
        Scanner console = new Scanner(System.in);
        System.out.print("URL to download? ");
        String urlString = console.nextLine();
        
        // create a downloader; re-prompt the user if this fails
        Downloader down = null;
        while (down == null) {
            try {
                // creating the Downloader can throw a MalformedURLException 
                // down = new Downloader(urlString);
                down = new TallyDownloader(urlString);
            } catch (MalformedURLException e) {
                // run this code if the code throws the exception
                System.out.print("Bad URL! Try again: ");
                urlString = console.nextLine();
            }
        }
        
        // prompt for output file name
        System.out.print("Target file name: ");
        String targetFileName = console.nextLine();
        
        // download bytes to file (print error message if it fails)
        try {
            down.download(targetFileName);
        } catch (IOException e) {
            System.out.println("An I/O error occurred: " + e.getMessage());
        }
    }
}