/*
 * Proj1GUI.java
 *
 * Created on October 10, 2002, 1:57 AM
 */

/** Create a GUI for testing a date investigator
 * The window has a text field where the user can type in a date
 * There is a text area where the results of the investigation are displayed
 *
 * @author  dickey
 */
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Point;
import java.awt.Rectangle;


class Proj1GUI extends JFrame {
    
    private final static int defaultWindowWidth = 500;
    private final static int defaultWindowHeight = 500;
    
        /** do little in the constructor
         */
    public Proj1GUI() {
        super("Date Discoverer (default name)");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    } //end constructor
    
    /** build the GUI frame and display it
     *There will be a label and two textareas: one for input, one for output
     */
    public void buildUI(IDateInvestigator dateInvestigator) {
        this.setSize(defaultWindowWidth, defaultWindowHeight);
        this.setTitle(dateInvestigator.getAuthor() + "'s " +
                dateInvestigator.getDescription());
        
        Container contents = this.getContentPane();
        contents.removeAll(); //in case the method is called more than once
        //use a border layout (should be the default anyway)
        contents.setLayout(new BorderLayout());
        
        //create a label, place it at the top
        String instructions = " Instructions: type in a date "
            + "and press Enter";
        contents.add(new JLabel(instructions), BorderLayout.NORTH);        
        
        //create a big output textarea
        JTextArea outputArea = new JTextArea("Results will appear here");
        outputArea.setEnabled(false); //don't let user type in        

        JScrollPane outputPane = new JScrollPane(outputArea); 
        Dimension areaSize = new 
                    Dimension(2*defaultWindowWidth/3, 3*defaultWindowHeight/4);
        outputPane.setPreferredSize(areaSize);
        
        contents.add(outputPane, BorderLayout.SOUTH);
        
        //create a small text input field 
        JTextField inputField = new JTextField("enter the date here");
        inputField.addActionListener(new TextListener(dateInvestigator, outputArea));
        inputField.setEnabled(true); //it's the default anyway
        inputField.setSelectionStart(0);
        inputField.setSelectionEnd(inputField.getText().length());
        Dimension fieldSize = new Dimension(defaultWindowWidth/3, 
                                        defaultWindowHeight/7);
        inputField.setPreferredSize(fieldSize);
        contents.add(inputField, BorderLayout.CENTER);
        
        this.show();
        
    } //end buildUI
    
} //end Proj1GUI

/** A listener for when the user hits enter on the text field
 */
class TextListener implements ActionListener {
    IDateInvestigator theInvestigator;
    JTextArea theTextArea;
    
    public TextListener (IDateInvestigator di, JTextArea ta) {
        theInvestigator = di;
        theTextArea = ta;
    }
    
    //don't want this constructor called!
    private TextListener() {   
    }
    
    /**method called when user presses the Enter key
     **/
    public void actionPerformed(ActionEvent e) {
        //the source had darn well better be the text field!
        JTextField theField = (JTextField) e.getSource();
        String usersInput = theField.getText();
        System.out.println(usersInput); //for debug
        
        //call the method which processes text
        boolean dateStatus = theInvestigator.setDate(usersInput);
        String dateInfo = theInvestigator.dateInformation();
        // assert dateInfo != null; //comment out for Java 1.3 and earlier
        
        if (dateStatus == true) {
            theTextArea.setText(" [Date was reported as valid]\n" + dateInfo);
        } else {
            theTextArea.setText(" [Date was reported as invalid]\n" + dateInfo);
        }
        theTextArea.setCaretPosition(0);
        
    } //end actionPerformed
    
}