public class avoiderWorld extends World
{
   // Game Music// 
   private GreenfootSound Megalovania;
   // Gpame Counter//
   private Counter scoreBoard;
   private int score = 0;
   //Enemies Spawn Rate//
   private int enemySpawnRate = 7;
   private int enemy2SpawnRate = 7;
   private int bossSpawnRate = 0;
   private int meteorSpawnRate = 0;
   //Enemies Speed //
   private int enemySpeed = 1;
   private int enemy2Speed = 1;
   private int bossSpeed = 1;
   private int meteorSpeed = 2;
   //Score for eliminating an enemy//
   private int enemyEliminatedScore = 1;
   private int enemy2EliminatedScore = 1;
   private int meteorEliminatedScore = 1;
   // Score neede for new level and num. of levels//
   private int newlvl = 25;
   private int levels = 1;
   public avoiderWorld()
   {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1, false); 
        //Plays this sound when the game starts//
        Megalovania = new GreenfootSound("sounds/megalovania.wav");
        Megalovania.playLoop();
        prepare();
   }

   private void prepare()
   {
        //Adds this classes to the screen before starting the game//
        avatar avatar = new avatar();
        addObject(avatar,304,359);
        avatar.setLocation(306,353);
        scoreBoard = new Counter("Score: ");
        addObject(scoreBoard, 70, 20);
   }
    
   public void act() 
   {
       //randomly add enemies to the world//
       if(Greenfoot.getRandomNumber(1500) < enemySpawnRate) 
       {
            //creates a new class called enemy//
            enemy e = new enemy();
            //sets the speed variable, you have to give it a value( it, double, float)
            e.setSpeed(enemySpeed);
            //Spawns the enemies between the screen ranges that you set//
            addObject(e, Greenfoot.getRandomNumber(getWidth()-20)+10, -30);
            //increase points for each enemy spawned
            scoreBoard.setValue(scoreBoard.getValue() + enemyEliminatedScore);
            score += enemyEliminatedScore;
       }
        
       if(Greenfoot.getRandomNumber(1500) < enemy2SpawnRate)
       {
            enemy2 e2 = new enemy2();
            e2.setSpeed(enemy2Speed);
            addObject(e2, Greenfoot.getRandomNumber(getWidth()-20)+10, -30);
            //increase points for each enemy2 spawned
            scoreBoard.setValue(scoreBoard.getValue() + enemy2EliminatedScore);
            score += enemyEliminatedScore;
       }
       
       if(Greenfoot.getRandomNumber(1500) < bossSpawnRate)
       {   
            boss bs = new boss();
            bs.setSpeed(bossSpeed);
            addObject(bs,307,62);
            scoreBoard.setValue(scoreBoard.getValue()+1);
       }
       
       if(Greenfoot.getRandomNumber(1500) < meteorSpawnRate)
       {    
            meteor mtr = new meteor();
            mtr.setSpeed(meteorSpeed);
            addObject(mtr, Greenfoot.getRandomNumber(getWidth()-20)+10, -30);
            scoreBoard.setValue(scoreBoard.getValue() + meteorEliminatedScore);
            score += meteorEliminatedScore;
       }
         
       /*each time score is == to a multiple of 25 and is less than 100
       run if statement that increases speed of both enemies*/
       if(score == newlvl)
       {
          IncreaseLevel();
       }
       
   }
    
   public void endGame() 
   {    
       //Displays the game over screen//
       gameOverScreen go = new gameOverScreen();
       Greenfoot.setWorld(go);
       Megalovania.stop();
   }
    
   public void IncreaseLevel()
   {
       if(score == 25)
       {
           levels = 8;
       }
       
       switch(score)
       {
           //If score equals to a case, the case will execute it, and once reached the next score it will stop the actual case and start with the new one 
           case 25:
            enemySpeed = 2;
            enemy2Speed = 2;
            break;
            
           case 50:
            enemySpawnRate = 0;
            break;
            
           case 75:
            enemySpawnRate = 8;
            break;
            
           case 100:
            enemy2SpawnRate = 8;
            break;
            
           case 125:
            enemySpawnRate = 0;
            enemy2SpawnRate = 0;
            meteorSpawnRate = 10;
            break;
            
           case 150:
            enemySpawnRate = 9;            
            enemy2SpawnRate = 8;
            break;
            
            case 175: 
            enemySpawnRate = 9; 
            enemy2SpawnRate = 9;
            break;
            
           case 200: 
            enemySpawnRate = 0;
            enemy2SpawnRate = 0;
            bossSpawnRate = 1;
            break;
       }
   }
}