/** DataSets class: the data sets for an animation

**/

package ciips.animation;

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

public class DataSets {
	private String base_data_file_name;

	// private String names[];
	private NamedIntList[] lists;

	private static final boolean DEBUG = true;

	public DataSets( AlgAnimFrame frame, String name ) /* throws Exception */ {
		int k;
		int n_data_files = 0;
		base_data_file_name = name;
		String fn, names[];

		names = getFileNames( frame );
		n_data_files = ((names == null)?0:names.length);
		if( n_data_files > 0 ) {
			lists = new NamedIntList[ n_data_files ];
			for(k=0;k<n_data_files;k++) {
				{
				fn = base_data_file_name + k;
				if( DEBUG ) System.out.println("loadData: filename ["+fn+"]");
				try {
					URL dataURL = new URL(frame.getApplet().getCodeBase(), fn);
					lists[k] = new NamedIntList( dataURL );
					} 
				catch (IOException e) {
					System.out.println("Data file or source file not found");
					} 
				catch (NullPointerException e) {}
				}
			}
		if( DEBUG ) {
			System.out.println("DataSets - " + n_data_files + " sets");
			for(k=0;k<n_data_files;k++) {
				System.out.println("<" + k + "> " + lists[k]);
				}
			}
		}
	}

	/** Find the list of file names with a given prefix and numeric extensions
	**/
	public String[] getFileNames( AlgAnimFrame frame ) {
		File f;
		String n[] = null;
		String names[] = new String[100];	// Arbitrary maximum
		int cnt = 0;
		URL base_name = frame.getApplet().getCodeBase();
		for( cnt=0;cnt<99;cnt++ ) {
			String fn = base_data_file_name + cnt;
			try {
				URL dataURL = new URL( base_name, fn );
				// URLConnection c = dataURL.openConnection();
				// long x = c.getDate();
				// System.out.println("AlgThread:getFN - " + cnt + ": " + fn + " date " + x );
				// Object o = c.getContent();
				// if ( o == null ) break;

				InputStream is = dataURL.openStream();
				byte[] b = new byte[6];
				int nb = is.read( b );
				if ( nb <= 0 ) break;
				// Assume that it we get here, we had a valid connection
				names[cnt] = fn;
				System.out.println("AlgThread:getFN - " + cnt + ": " + fn + 
                              " [" + b + "]" );
				} 
			catch (IOException e) {
				break;
				} 
			}
		if ( cnt <= 0 ) {
			System.out.println("DataSets:getFileNames base_name [" +
													base_data_file_name + "] - none found");
			}
		else {
			System.out.println("DataSets:getFileNames - " + cnt + " found");
			n = new String[cnt];
			for( int j=0;j<cnt;j++ ) { n[j] = names[j]; }
			}
		return n;
		}

	/** Return the name of the k'th data set
	*/
	public String getName( int k ) {
		return lists[k].getName();
		}

	/** Return the k'th data set
	*/
	public NamedIntList getNamedIntList( int k ) {
		return lists[k];
		}

	public int size() {
		if ( lists != null ) return lists.length;
		return 0;
		}

	public String toString() {
		String s = "DataSets (" + lists.length + ") ";
		for( int k=0;k<lists.length;k++ ) {
			s = s + lists[k].getName() + ";";
			}
		return s;
		}
	}