package OO14route66;

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * OO13route66 animation
 * @author Pieter Koopman
 *
 * Yields a graphical view on all cars
 */
public class RoadView extends JFrame
{
    JPanel panel;                               // the panel to draw the cars
    public static final int WINDOWSIZE = 600;   // the window size
    private final Model model;                  // the model knows the position of cars

    /**
     * A subclass of JPanel to draw the cars.
     * This is a bit of a hack to ensure that this panel is painted correctly.
     */
    private class CarPanel extends JPanel {
        /**
         * Constructor: just call the constructor of the base class
         */
        public CarPanel() {
            super();
        }
        /**
         * paint the roads and cars
         * @param g Graphics to paint on
         */
        @Override
        public void paint (Graphics g) {
            paintRoad(g);
            paintCars(g);
        }
    }
    /**
     * The constructor of RoadView
     * @param model
     */
    RoadView(Model model) {
        super("Route66 traffic simulator");
        this.model = model;
        setSize(WINDOWSIZE, WINDOWSIZE);
        setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        panel = new CarPanel();
        add(panel);
    }            
    /**
     * Paint the view of the model graphically
     * @param g
     */
    @Override
    public void paint(Graphics g) {
        super.paint(g);
        panel.repaint();
    }
    /**
     * Paint all cars
     * @param g graphics to draw on
     */
    private void paintCars (Graphics g) {
        for (int i = 0; i < Model.NUMBEROFCARS; i += 1) {
            model.getCar(i).paint(g);
        }
    }

    /**
     * Paint the roads
     * @param g graphics to draw on
     */
    private void paintRoad (Graphics g) {
        final int left = (WINDOWSIZE / 2) - Car.CARWIDTH - 4;
        final int width = 2 * Car.CARWIDTH + 8;
        g.setColor(Color.white);    // background
        g.fillRect(0, 0, WINDOWSIZE, WINDOWSIZE);
        g.setColor(Color.darkGray); // streets
        g.fillRect(0, left, WINDOWSIZE, width);
        if (Model.DIRECTIONS > 2) {  // paint a crossing if there are 4 directions
            g.fillRect(left, 0, width, WINDOWSIZE);
        }
    }
}