package {

import flash.display.MovieClip;
import flash.events.MouseEvent;
public class DocumentClass extends MovieClip
{
    public var playScreen:AvoiderGame;
    public var gameOverScreen:GameOverScreen;
    public var menuScreen:MenuScreen;
    public var creditScreen:CreditScreen;

    public function DocumentClass()
    {
        menuScreen = new MenuScreen();
        menuScreen.addEventListener( NavigationEvent.START, onRequestStart );
        menuScreen.x = 0;
        menuScreen.y = 0;
        addChild( menuScreen );
    }

    public function onAvatarDeath( avatarEvent:AvatarEvent ):void
    {
        var finalScore:Number = playScreen.getFinalScore();
        var finalClockTime:Number = playScreen.getFinalClockTime();

        gameOverScreen = new GameOverScreen();
        gameOverScreen.addEventListener( NavigationEvent.RESTART, onRequestRestart );
        gameOverScreen.x = 0;
        gameOverScreen.y = 0;
        gameOverScreen.setFinalScore( finalScore );
        gameOverScreen.setFinalClockTime( finalClockTime );
        addChild( gameOverScreen );

        playScreen = null;
    }

    public function onRequestRestart( navigationEvent:NavigationEvent ):void
    {
        restartGame();
    }

    public function onRequestStart( navigationEvent:NavigationEvent ):void
    {
        playScreen = new AvoiderGame();
        playScreen.addEventListener( AvatarEvent.DEAD, onAvatarDeath );
        playScreen.x = 0;
        playScreen.y = 0;
        addChild( playScreen );

        menuScreen = null;
    }

    public function restartGame():void
    {
        playScreen = new AvoiderGame();
        playScreen.addEventListener( AvatarEvent.DEAD, onAvatarDeath );
        playScreen.x = 0;
        playScreen.y = 0;
        addChild( playScreen );

        gameOverScreen = null;
    }

    public function showCredit():void
    {
        creditScreen = new CreditScreen;
        //add credit
        addChild(creditScreen);
        creditScreen.creditButton.addEventListener(MouseEvent.CLICK, clickCredit);
        creditScreen.x = 0;
        creditScreen.y = 0;

    }

    public function clickCredit(e:MouseEvent):void
    {
        menuScreen = null;
        creditScreen.creditButton.addEventListener(MouseEvent.CLICK, clickCredit);
        showCredit();
    }

}

package  {
import flash.events.*;

public class NavigationEvent extends Event
{
    public static const RESTART:String = "restart";
    public static const START:String = "start";
    public static const CREDIT:String = "credit";

    public function NavigationEvent( type:String, bubbles:Boolean = false, cancelable:Boolean = false )
    {
        super( type, bubbles, cancelable );

    }

    public override function clone():Event
    {
        return new NavigationEvent( type, bubbles, cancelable );
    }

    public override function toString():String
    {
        return formatToString( "NavigationEvent", "type", "bubbles", "cancelable", "eventPhase" );
    }

}

package {
import flash.display.MovieClip;
import flash.display.SimpleButton;
import flash.events.MouseEvent;

public class MenuScreen extends MovieClip
{
    public function MenuScreen()
    {
        startButton.addEventListener( MouseEvent.CLICK, onClickStart );
    }

    public function onClickStart( mouseEvent:MouseEvent ):void
    {
        dispatchEvent( new NavigationEvent( NavigationEvent.START ) );
    }
}