import uwcse.graphics.*;
import java.awt.Color;
import java.awt.Font;

/**
 * Display in a graphics window a traffic light and a menu.
 */

public class TrafficLightView{

    // Menu
    // Upper left corner
    public static final int XM = 10;
    public static final int YM = 350;

    // size
    public static final int MENU_WIDTH=65;
    public static final int MENU_HEIGHT=20;

    // Graphics elements
    private GWindow window;
    private Oval[] lights;

    /**
     * Create the graphics window and the menu
     */
    public TrafficLightView(TrafficLightController c)
    {
        // Create the display
        window = new GWindow("Traffic light",500,500);
        window.setExitOnClose();
        // Send all the window events to the controller
        window.addEventHandler(c);
        // Background
        window.add(new Rectangle(0,0,500,500,Color.blue,true));

        // Create the menu
        drawMenu();

        // Create the lights
        drawLights();

        // Show it
        window.doRepaint();
    }

    /**
     * Update the display of the lights according to the model
     */
    public void updateDisplay(TrafficLightModel model)
    {
        // Turn off all of the lights
        for(int i=0; i<lights.length; i++)
            lights[i].setColor(Color.black);
        Color c = model.getColor();
        if (c.equals(Color.red))
            lights[0].setColor(c);
        else if(c.equals(Color.yellow))
            lights[1].setColor(c);
        else if(c.equals(Color.green))
            lights[2].setColor(c);

        // Show the new light
        window.doRepaint();
    }

    /**
     * Start the animation (If we followed the MVC framework to the letter,
     * we should have put this piece of code
     * in the controller. But that way we can make use of the timer features
     * of the GWindow class)
     *
     * Start firing an event every dt milliseconds
     */
    public void startTimerEvents(int dt)
    {
        window.startTimerEvents(dt);
    }

    /**
     * Stop firing an event at regular intervals
     */
    public void stopTimerEvents()
    {
        window.stopTimerEvents();
    }

    /**
     * Translate a mouse click location (x,y) into a MouseClickLocation object
     * (see the definition of the MouseClickLocation class)
     */
    public MouseClickLocation findClickLocation(int x, int y)
    {
        // Inactive area if not on the menu
        if (x<XM || x>XM+MENU_WIDTH || y<YM || y>=YM+MENU_HEIGHT*4)
            return new MouseClickLocation(MouseClickLocation.INACTIVE_AREA);

        // The click is on one of the button items
        switch((y-YM)/MENU_HEIGHT)
        {
            case 0: // Click on red
                return new MouseClickLocation(MouseClickLocation.RED);
            case 1: // Click on yellow
                return new MouseClickLocation(MouseClickLocation.YELLOW);
            case 2: // Click on green
                return new MouseClickLocation(MouseClickLocation.GREEN);
            case 3: // Click on animate
                return new MouseClickLocation(MouseClickLocation.ANIMATE);
            default: // never get here (but the compiler can't tell)
                return new MouseClickLocation(MouseClickLocation.INACTIVE_AREA);
        }
    }

    /**
     * Draw the menu
     */
    private void drawMenu()
    {
        // Create the buttons
        // Upper left corner of each button
        int x = XM;
        int y = YM;
        String[] labels = {"Red", "Yellow", "Green", "Animate"};
        Font font = new Font("Times",Font.BOLD,15);
        for(int i=0; i<4; i++)
        {
            window.add(new Rectangle(x,y,MENU_WIDTH,MENU_HEIGHT,Color.black,false));
            // label
            window.add(new TextShape(labels[i],x+5,y,Color.black,font));
            // next menu item
            y+=MENU_HEIGHT;
        }

    }

    /**
     * Draw the lights in the window
     */
    private void drawLights()
    {
        // Create the lights (red,yellow,green)
        // box of the traffic light
        window.add(new Rectangle(200,50,100,300,Color.black,true));
        // lights: each light is in a container
        Color[] colors = {Color.red,Color.yellow,Color.green};
        lights = new Oval[3];
        int x=210, y=60; // upper right corner of the red light
        for(int i=0; i<3; i++)
        {
            // light frame
            window.add(new Oval(x,y,80,80,colors[i],true));
            // light
            lights[i] = new Oval(x+2,y+2,76,76,Color.black,true);
            window.add(lights[i]);
            // next light
            y+=100;
        }
    }
}