import uwcse.graphics.*;

/**
 * The TrafficLightController manages the interaction between the user
 * and a traffic light (change colors, animate...)
 */

public class TrafficLightController extends GWindowEventAdapter{
// By extending GWindowEventAdapter, a TrafficLightController can
// receive events generated by mouse clicks or a timer.

    // To create a traffic light, use a view and a model
    private TrafficLightView view;
    private TrafficLightModel model;

    private boolean isAnimationOn = false; // true if the traffic light is changing colors automatically
    private int maxCounter = 11; // number of timer intervals in one animation
    private int counter = 0; // current timer interval in the animation

    /**
     * Create the display of a traffic light. The user can interact with
     * the display via mouse clicks.
     */
    public TrafficLightController()
    {
        // the view:
        // Clicks on the display of the traffic lights
        // are sent to this TrafficLightController
        this.view = new TrafficLightView(this);
        // the model:
        this.model = new TrafficLightModel(this.view);
    }

    /**
     * A click on the window has been received. Process the user's click.
     */
    public void mousePressed(GWindowEvent e)
    {
        // Ignore the event if the animation is going on
        if (this.isAnimationOn) return;

        // Click location
        int x = e.getX();
        int y = e.getY();

        // Ask the view to define the mouse click in terms of the
        // relevant areas of the window
        MouseClickLocation clickLoc = this.view.findClickLocation(x,y);

        // Process the mouse click
        switch(clickLoc.area)
        {
            case MouseClickLocation.RED: // Click on red
                this.model.turnRed();
                break;
            case MouseClickLocation.YELLOW: // Click on yellow
                this.model.turnYellow();
                break;
            case MouseClickLocation.GREEN: // Click on green
                this.model.turnGreen();
                break;
            case MouseClickLocation.ANIMATE: // Click on animate
                this.isAnimationOn = true;
                this.view.startTimerEvents(1000);
                break;
        }
    }

    /**
     * Do the animation of the traffic light
     */
    public void timerExpired(GWindowEvent e)
    {
        if (this.counter<=this.maxCounter)
        {
            this.model.nextColor();
            this.counter++;
        }
        else
        {
            this.isAnimationOn = false;
            this.counter=0;
            this.view.stopTimerEvents();
        }
    }
}