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

class ListNews
	{
    public static String host=null,group_name=null,user=null,password=null;
	public static PrintStream console_out=System.out,console_err=System.err,logfile=null;

	public static void main(String args[])
		{
		doCommandLine(args);
		/* also load from command-line-list */
		};

	public static void flushState()
		{
		console_out.println("------------------");

		console_out.println("status : Doing Garbage Collection...");
		System.gc();
		console_out.println("status : Garbage Collection done.");
		};

  public static void doCommandLine(String args[])
 		{
		NNTP_Client nntp;
		ArticleHeader header,lastheader;
		boolean keepgoing,matched;
		int argi;
		boolean wantshelp=false;
		int files_got=0,files_seen=0;
		String matchMe;
		long diffclock;

		console_out = System.out;
		console_err = System.err;

		for(argi=0;argi<args.length;argi++)
			{
			if ( args[argi].length() > 1 )
				{
				if ( args[argi].charAt(0) == '-' )
					{
					int parami = 2;
					String param;
					if ( args[argi].length() > 2 )
						if ( args[argi].charAt(2) == ':' || args[argi].charAt(2) == '=' )
							parami++;
					if ( args[argi].length() > parami )
						param = new String(args[argi].substring(parami));
					else
						param = null;

					switch( args[argi].charAt(1) )
						{
						case '?': case 'H': case 'h':
							wantshelp = true;
							break;
						case 'U': case 'u':
							user = param;
							console_out.println("got user : " + user);
							break;
						case 'P': case 'p':
							password = param;
							console_out.println("got password : " + password);
							break;
						default:
							console_out.println("Unknown flag : " + args[argi] + "ignored");
							break;
						}
					}
				else
					{
					if ( host == null ) host = args[argi];
					else if ( group_name == null ) group_name = args[argi];
					else console_out.println("Extra argument : " + args[argi] + "ignored");
					}
				}
			}

		if ( host == null || group_name == null || wantshelp )
			{
			console_out.println("usage: ListNews newshost group -[options]");
			console_out.println("options:");
			console_out.println("\tu\tuser name");
			console_out.println("\tp\tpassword");
			return;
			}

		try { logfile = new PrintStream( (OutputStream) new FileOutputStream("listnews.log") ); }
		catch ( IOException e ) { console_out.println("Error opening testnews.log : " + e );
			console_out.println("exiting"); return; }

    console_out.println("Opening NNTP_Client on: " + host + "...");

    try	{ nntp = new NNTP_Client(host,logfile,user,password);
		} catch (IOException e)
			{
      System.err.println("error " + e);
      System.err.println("Could not create NNTP client. Exiting.");
      return;
    	}

    if ( ! nntp.isConnected() )
    	{
      System.err.println("error.");
      System.err.println("Could not connect to news host :" + host);
      return;
    	}
    console_out.println("Connected okay.");

		console_out.println("Changing to group: " + group_name);
		if ( ! nntp.goGroup(group_name) )
			{
			System.err.println("failed");
			return;
			}
    console_out.println("okay.");

    console_out.println("Getting article headers.");

		lastheader = null;

		do
			{

			try {

			header = nntp.getHeader();
			lastheader = header;

			console_out.println("------------------");
			console_out.print("header : subject: ");
			if ( header.subject.length() > 60 )
				console_out.println(header.subject.substring(header.subject.length() - 60) );
			else
				console_out.println(header.subject);

			console_out.println("header : author : " + header.author);
			console_out.println("header : date   : " + header.date);
			console_out.println("header : number : " + header.number);
			console_out.println("header : lines  : " + header.lines);
			console_out.println("header : bytes  : " + header.bytes);
			console_out.println("------------------");

			files_seen++;

			keepgoing = nntp.next();

			}	catch ( IOException e )
				{
				boolean newkeepgoing = false;
				do
					{
					keepgoing = true;

					console_err.println("error  : " + e + ", trying NNTP.reset");
					try {
					if ( lastheader == null )	keepgoing = nntp.reset();
					else keepgoing = nntp.reset(lastheader);
					} catch ( IOException err )
					{ System.err.println("fatal  : couldn't reset : " + err ); keepgoing = false; }

					if ( ! keepgoing ) newkeepgoing = clib.askContinue();
					}	while(!keepgoing && newkeepgoing );
				}

			console_err.println("status : " + files_seen + " articles seen");

			} while( keepgoing );

		console_out.println("------------------");

		console_out.println("No more articles.");
   	console_out.println("Disconnecting...");
		nntp.disconnect();
    console_out.println("done.");

		flushState();
		}
	};