package lab4.gui;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.util.Observable;
import java.util.Observer;
import javax.swing.JPanel;
import lab4.data.GameGrid;

/**
 * A panel providing a graphical view of the game board
 */

public class GamePanel extends JPanel implements Observer{

    private final int UNIT_SIZE = 20;
    private GameGrid grid;
    int[][] gameBoard;

    /**
     * The constructor
     *
     * @param grid The grid that is to be displayed
     */
    public GamePanel(GameGrid grid){
        this.grid = grid;
        gameBoard = new int[grid.getSize()][grid.getSize()];
        grid.addObserver(this);
        Dimension d = new Dimension(grid.getSize()*UNIT_SIZE+1, grid.getSize()*UNIT_SIZE+1);
        this.setMinimumSize(d);
        this.setPreferredSize(d);
        this.setBackground(Color.WHITE);
    }

    /**
     * Returns a grid position given pixel coordinates
     * of the panel
     *
     * @param x the x coordinates
     * @param y the y coordinates
     * @return an integer array containing the [x, y] grid position
     */
    public int[] getGridPosition(int x, int y){
        int xSquare = (int)Math.ceil(x/UNIT_SIZE); // checks witch square in x-direction was clicked
        int ySquare = (int)Math.ceil(y/UNIT_SIZE); // checks witch square in y-direction was clicked
        return new int[] {xSquare,ySquare}; // returns array with x- and y-coordinate for the square that was clicked
    }
    /**
     * Makes sure that the board gets repainted when something has changed
     */
    public void update(Observable arg0, Object arg1) {
        this.repaint();
    }

    /**
     * Paints the board or game grid and the moves made by calling paintBoard with the graphics
     * @param g the graphics
     */
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        paintBoard(g);//drawing of the board
        }

    /**
     * Paints the board or game grid together with the moves made.
     * Filled oval in blue represents player me and filled oval in pink represents player other.
     * @param g the graphics
     */
    private void paintBoard(Graphics g){ //drawing of the board
        int x = 0; // creates integer x witch is the top left corners x coordinate and sets it to 0
        int y = 0; // creates integer y witch is the top left corners y coordinate and sets it to 0
        for(int i = 0; i < grid.getSize();i++) {
            for (int n = 0; n < grid.getSize(); n++){
                g.drawRect(x, y, UNIT_SIZE, UNIT_SIZE);
                if (this.grid.board[i][n] == this.grid.ME){
                    g.setColor(Color.BLUE); //sets color for the making of the oval
                    g.fillOval(i*UNIT_SIZE+UNIT_SIZE/4, n*UNIT_SIZE+UNIT_SIZE/4, UNIT_SIZE/2, UNIT_SIZE/2);
                    //creates a small circle in the middle of the square in question. is ONLY (fuck!) drawn on ME:s board
                    g.setColor(Color.black); // resets the color back to default
                    x = x + UNIT_SIZE;
                }
                 if (this.grid.board[i][n] == this.grid.OTHER){
                    g.setColor(Color.PINK);
                    g.fillOval(i*UNIT_SIZE/2, n*UNIT_SIZE/2, UNIT_SIZE, UNIT_SIZE);
                    g.setColor(Color.black);
                    x = x + UNIT_SIZE;
                }
                else {
                    x = x + UNIT_SIZE;
                }
            }
            x = 0;
            y = y + UNIT_SIZE;
        }

    }
}