// TradeViewer.java
// Author: P Gray
// Simple scrollable list over a set of financial records.
// Selected list element is displayed in a separate pane.

import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.util.Enumeration;

public class TradeViewer extends Frame {
  private SourceDomain sourceDomain;
  private List listWidget;
  private ListPanel listPanel;
  private StarFieldPanel starFieldPanel;
  private RecordPanel recordPanel;

  public TradeViewer(String title, String filename) {
  	// create a new source domain
    	sourceDomain = new SourceDomain();
    	// load it with sourceDomain
    	sourceDomain.load(filename);
    	// initialise presentation
    	setTitle(title);
	setLayout(new BorderLayout());
	setSize(new Dimension(600,800));
	// add components
	listPanel = new ListPanel(this);
	add("West", new ListPanel(this));
	recordPanel = new RecordPanel(this, sourceDomain.labels());
	add("South", recordPanel);
	starFieldPanel = new StarFieldPanel(this);
	add("Center", starFieldPanel);
	// add event handlers
	addWindowListener(new WindowHandler(this));
	// show it
	setVisible(true);
   }

   public Insets getInsets()	{
   	// space my elements
	return new Insets(25,5,5,5);
	}

  public static void main(String args[]) {
  		TradeViewer tradeList = new TradeViewer("Trade Viewer", "data.csv");
    }


    // accessing methods
    public SourceDomain sourceDomain()	{
    	return sourceDomain;
    }

   // updating methods - called when an item in the source domain is selected
   public void handleSelection(int row)	{
   	if (row >= 0)	{
   		recordPanel.update(sourceDomain.record(row));
   		starFieldPanel.update(row);
   	}
   }


} // end TradeViewer

class ListPanel extends Panel implements ItemListener	{
	private List listWidget;
	private TradeViewer application;

	public ListPanel(TradeViewer application)	{
		this.application = application;
		// initialise presentation
		setBackground(Color.lightGray);
		setLayout(new GridLayout(1,1));
		// create list widget
		listWidget = new List(application.sourceDomain().dataSize());
		// put record labels into list
		Vector idList = application.sourceDomain().ids();
		Enumeration idListElements = idList.elements();
		while (idListElements.hasMoreElements())
			listWidget.add((String)idListElements.nextElement());
		// add component
		add(listWidget);
		// add listener on the list widget
		listWidget.addItemListener(this);
	}

	public void itemStateChanged(ItemEvent ie)	{
		application.handleSelection(listWidget.getSelectedIndex());

	}
} // end ListPanel


class RecordPanel extends Panel 	{
	private Vector fieldLabelWidgets, fieldValueWidgets;
	private TradeViewer application;

	public RecordPanel(TradeViewer application, Vector labels)	{
		this.application = application;
		// initialise presentation
		setBackground(Color.lightGray);
		setLayout(new GridLayout(14,2));
		// create the text fields
		fieldLabelWidgets = new Vector();
		fieldValueWidgets = new Vector();
		makeWidgets(labels);
		// put the text fields into the panel
		Enumeration fieldLabelWidgetsElements = fieldLabelWidgets.elements();
		Enumeration fieldValueWidgetsElements = fieldValueWidgets.elements();
		while (fieldLabelWidgetsElements.hasMoreElements()) 	{
			add((TextField)fieldLabelWidgetsElements.nextElement());
			add((TextField)fieldValueWidgetsElements.nextElement());
		}
	}

	private void makeWidgets(Vector labels)	{
		TextField tf;
		for (int i = 0; i < labels.size() ; i++) {
			tf = new TextField( (String) labels.elementAt(i) );
			tf.setEditable(false);
			fieldLabelWidgets.addElement(tf);
			tf = new TextField("unselected");
			tf.setEditable(false);
			fieldValueWidgets.addElement(tf);
		}
	}

	public void update(Vector record)	{
		for (int i = 0; i < record.size(); i++)
			((TextField) fieldValueWidgets.elementAt(i)).setText((String) record.elementAt(i));
		repaint();
	}

}	// end RecordPanel

class WindowHandler extends WindowAdapter {
	private TradeViewer appWindow;
	public WindowHandler(TradeViewer appWindow)	{
		this.appWindow = appWindow;
	}
	public void windowClosing(WindowEvent we)	{
		appWindow.setVisible(false);
		appWindow.dispose();
		System.exit(0);
	}
}