package com.java21days.banko;

import javax.swing.ImageIcon;
import javax.swing.JButton;

public class Button extends JButton {
   // the button's position
   public int row;
   public int column;
   // the button's state (-2 money, -1 cleared, 0 uncleared)
   public int state;
   // the number of adjacent money bags
   public int near;
   // true if this is a money bag that has been found
   public boolean found;
   // the game board
   private final Board board;
   // the two bag graphics
   private static ImageIcon unknownBag;
   private static ImageIcon moneyBag;


   // create a new button
   Button(Board board, int row, int column) {
       super("");
       // store the board that contains this button
       this.board = board;
       // store the button's position
       this.row = row;
       this.column = column;
       // set up button graphics (if necessary)
       if (unknownBag == null) {
            unknownBag = board.app.getImageIcon("unknown_bag.gif");
            moneyBag = board.app.getImageIcon("money_bag.gif");
       }
       // set up the button
       setup();
   }

   // set up the button for gameplay
   public final void setup() {
       fill();
       state = 0;
       near = 0;
       found = false;
       // remove the background color (from a previous game)
       setBackground(null);
   }

   // reveal an unopened bag in the square
   public void fill() {
       // give this button the unopened bag icon
       setIcon(unknownBag);
       // remove the label
       setText("");
       // enable the button
       setEnabled(true);
   }

   // reveal an empty square and count adjacent money bags
   public void clear(boolean clicked) {
       if (clicked) {
            /* this square was manually cleared by the user, so tell
                the frame to charge the player */
            board.app.spendMoney();
       }
       // remove the icon
       setIcon(null);
       // tell the button it is clear and disable it
       state = -1;
       setEnabled(false);
       if (near > 0) {
            // reveal that one or more money bags are nearby
            setText("" + near);
       } else {
            /* inspect the buttons above, below, left, and right
                of this one */
            Button above = above();
            Button below = below();
            Button left = left();
            Button right = right();
            /* if any of these buttons is clear and has no money bags
                nearby, clear it -- using recursion to fan out around
                the board */
            if ((above != null) && (above.state == 0)) {
                // clear the button above
                above.clear(false);
            }
            if ((below != null) && (below.state == 0)) {
                // clear the button below
                below.clear(false);
            }
            if ((left != null) && (left.state == 0)) {
                // clear the button to the left
                left.clear(false);
            }
            if ((right != null) && (right.state == 0)) {
                // clear the button to the right
                right.clear(false);
            }
       }
   }

   // reveal a money bag
   public void revealMoney() {
       // give this button the money bag icon
       setIcon(moneyBag);
       // remove the label
       setText("");
       if (!found) {
            /* this bag has never been found, so tell the frame
                to award money to the player */
            board.app.earnMoney();
            // tell this bag it has been found
            found = true;
       }
   }

   /* these four directional methods inspect four buttons adjacent
       to this one, returning null on the edges of the game board */
   public Button above() {
       if (row > 0) {
            // return the adjacent button
            return board.square[row - 1][column];
       }
       // return null to indicate a board edge has been passed
       return null;
   }

   public Button below() {
       if (row < board.rows - 1) {
            return board.square[row + 1][column];
       }
       return null;
   }

   public Button left() {
       if (column > 0) {
            return board.square[row][column - 1];
       }
       return null;
   }

   public Button right() {
       if (column < board.columns - 1) {
            return board.square[row][column + 1];
       }
       return null;
   }
}