/* Copyright 1996 Rujith de Silva.
   Modified 2002-03-29. */

package rujith.pentominoes;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import java.awt.Button;
import java.awt.Checkbox;
import java.awt.Cursor;
import java.awt.CheckboxGroup;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Label;
import java.awt.LayoutManager;
import java.awt.Panel;

/**
 * Controls of a pentominoes board.  Includes the Board on which the
 * pieces move.
 */
public class BoardControls extends Frame {
    Checkbox cb3;
    Checkbox cb4;
    Checkbox cb5;
    Checkbox cb6;
    Button quit;
    Board board;
    LayoutManager layout;

    /**
     * Are the BoardControls still active?
     */
    public boolean boardHere = true;

    /**
     * Create a new BoardControls.
     */
    public BoardControls() {
        super("Pentominoes");
        this.setBackground(Color.lightGray);

        // Create the check-boxes for the height of the target area
        CheckboxGroup cbg = new CheckboxGroup();
        this.cb3 = new Checkbox("3", cbg, false);
        this.cb4 = new Checkbox("4", cbg, false);
        this.cb5 = new Checkbox("5", cbg, false);
        this.cb6 = new Checkbox("6", cbg, true);

        // Listen to changes in the checkbox selection
        ItemListener il = new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                BoardControls.this.setHeight
                    ((Checkbox) e.getItemSelectable());
            }
        };
        this.cb3.addItemListener(il);
        this.cb4.addItemListener(il);
        this.cb5.addItemListener(il);
        this.cb6.addItemListener(il);

        GridBagLayout gbl = new GridBagLayout();
        this.setLayout(gbl);
        this.layout = gbl;

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.ipadx = gbc.ipady = 1;

        Label height = new Label ("Target Height:");
        gbc.anchor = GridBagConstraints.EAST;
        gbc.weightx = 1.0;
        gbl.setConstraints(height, gbc);
        this.add(height);

        gbc.weightx = 0.0;
        gbc.anchor = GridBagConstraints.WEST;
        gbl.setConstraints(this.cb3, gbc);
        this.add(this.cb3);

        gbl.setConstraints(this.cb4, gbc);
        this.add(this.cb4);

        gbl.setConstraints(this.cb5, gbc);
        this.add(this.cb5);

        gbl.setConstraints(this.cb6, gbc);
        this.add(this.cb6);

        // Button to quit/close the BoardControls
        this.quit = new Button("Quit");
        this.quit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                BoardControls.this.quit();
            }});
            
        gbc.weightx = 1.5;
        gbc.ipadx = 5;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.anchor = GridBagConstraints.CENTER;
        gbl.setConstraints(this.quit, gbc);
        this.add(this.quit);

        // The actual Board, occupying the majority of the space.  The
        // BoardListener listens for changes in the Board to change
        // the cursor.
        this.board = new Board(new BoardListener() {
            public void changed(int status) {
                BoardControls.this.changed(status); }});
        gbc.ipadx = 1;
        gbc.weightx = gbc.weighty = 1.0;
        gbc.anchor = GridBagConstraints.CENTER;
        gbl.setConstraints(this.board, gbc);
        this.add(board);

        // Show it all.
        gbl.layoutContainer(this);
        this.pack();
        this.setSize(365, 430);
    }

    // Change the cursor according to the state of the board.
    void changed(int status) {
        int cursor = Cursor.DEFAULT_CURSOR;
        switch(status) {
        case 1:
            cursor = Cursor.MOVE_CURSOR;
            break;
        case 2:
            cursor = Cursor.HAND_CURSOR;
            break;
        default:
            cursor = Cursor.DEFAULT_CURSOR;
            break;
        }
        this.setCursor(Cursor.getPredefinedCursor(cursor));
    }

    // Close the board
    void quit() {
        // Mark the board as closed, even though the Java object
        // continues to exist.
        this.boardHere = false;

        this.dispose();
    }

    // Set the height of the target area.
    void setHeight(Checkbox cb) {
        if (cb == this.cb3)       this.board.setHeight(3);
        else if (cb == this.cb4)  this.board.setHeight(4);
        else if (cb == this.cb5)  this.board.setHeight(5);
        else if (cb == this.cb6)  this.board.setHeight(6);
    }

    /**
     * @return Preferred dimension
     */
    public Dimension getPreferredSize() {
        return this.layout.minimumLayoutSize(this);
    }

    /**
     * @return Minimum dimension
     */
    public Dimension getMinimumSize() {
        return this.getPreferredSize();
    }
}