import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.Graphics2D.*;
import java.awt.geom.Line2D;

/**
 * GridGIS creates a window and adds buttons to it, which allow the user
 * to choose which map they would like to view.  The user will click on 
 * the button and GIS tells Grid to create and draw a map of this area.
 * The map must be in the form *.asc to work in this class.  To switch the
 * map options, change "STRING_1", "STRING_2", or "STRING_3" to a different
 * file name (less the ".asc").
 * 
 * @Elizabeth French
 * @04/04/08
 */

public class GridGIS extends JFrame implements MouseListener {
    private static final int  WINDOW_SIZE = 400;
    
    //Strings for file names attached to the buttons
    private static final String STRING_1 = "test1",
                                STRING_2 = "set1",
                                STRING_3 = "test2",
                                //The file type of the maps
                                FILE_END = ".asc";
    private Grid grid;
    
    //JPanel with available maps and a "clear" button
    private JPanel mapOptions;
    private JButton map1, map2, map3, clear;
    
    //Is there a map in the window?
    private boolean mapped = false;
    

    /** Constructer will create the window and place 3 map options and one
     * "clear" option (to clear the window) buttons in the window.  It will
     * also add listeners to the buttons and set itself as the listener
     */
    public GridGIS() {
        super("My Grid");
        
        // declare JButtons with map names
        map1 = new JButton(STRING_1);
        map2 = new JButton(STRING_2);
        map3 = new JButton(STRING_3);
        clear = new JButton("Clear");
        
        // declare JPanel with options for the map to draw
        mapOptions = new JPanel();
        
        // add JButtons to mapOptions
        mapOptions.add(map1);
        mapOptions.add(map2);
        mapOptions.add(map3);
        mapOptions.add(clear);
        // calls on method to add listeners to buttons
        addMapListeners();
        
        // add mapOptions panel to frame
        getContentPane().add("South", mapOptions);
        //exit on close 
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        setVisible(true);
        addMouseListener(this);
        
        //Set size, allowing for extra height b/c of mapOption panel
        setSize(WINDOW_SIZE,WINDOW_SIZE + mapOptions.getHeight());
        System.out.println("You must press 'Clear' after a map is drawn"
                        + " if you would like to draw a different map");
    }
    
    /** Method to add listeners to the buttons.  Listeners will check to 
     * see if a map is already drawn.  If not, then pressing on a map
     * button will draw that map.  If so, then pressing on "clear" will
     * remove the map, allowing you to create another
     * Maps will correspond to files with same names as the buttons, ending
     * in the FILE_END as the file type
     * @param none
     * @return void
     */
    public void addMapListeners() {
        map1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //If the window is clear, make the map
                if (!mapped)  makeGrid(STRING_1.concat(FILE_END));
            }
        });

        map2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //If the window is clear, make the map
                if (!mapped)  makeGrid(STRING_2.concat(FILE_END));
            }
        });
        
        map3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //If the window is clear, make the map
                if (!mapped)  makeGrid(STRING_3.concat(FILE_END));
            }
        }); 
        clear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //If there is a map, then clear it
                if (mapped) {
                    repaint();
                    mapped = false;
                }
            }
        });     
    }
    
    /** Method to create a grid using the file name of the parameter given
     * @param name  the file name of the grid to create
     * @return void
     */
    public void makeGrid(String name) {
        Graphics2D g2 = (Graphics2D)getGraphics();
        //Create and draw grid with file name and give the window size
        grid = new Grid(name, WINDOW_SIZE);
        grid.drawGrid(g2);
        //Redraw the buttons
        mapOptions.repaint();
        
        mapped = true;
    }
    
    //Empty, but must comply with MouseListener interface
    public void mousePressed(MouseEvent e) {} 
    public void mouseClicked(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {} 
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {} 
    
    /** Main method creates the GIS which will allow the user to choose 
     * which map (of three choices) they want
     * @param args
     * @return void
     */
    public static void main(String[] args) {
        GridGIS gis = new GridGIS();
    }
}