this.options = {
  root_mode: "invasion",
  map_size: 30
};

this.tick = function(game){
  if (game.step == 1800){
    for (var i=0;i<game.ships.length;i++){
      game.ships[i].set({stats:66666666,type:605, shield: 400, crystals:720, x:150, y:150, vx:0, vy:0});
    }
  }
  if(game.step == delay*2){
    killasteroids(game);
  }
  var delay = 3600;
  if(game.step < 300 + delay && game.step % 60 === 0){
    game.addCollectible({code:21, x:150, y:150});
  }
  if(game.step >= 300 + delay && game.step < 2700 + delay && (game.step - delay) % 60 === 0){
    var angle = Math.random()*Math.PI*2;
    game.addAlien({code:11, level:2, crystal_drop:30, x: Math.cos(angle)*120, y: Math.sin(angle)*120}); //40 Red Chickens
  }
  if(game.step >= 7200 && game.step % 60 === 0){
    killAllChickens(game);
  }
  if(game.step >= 300 + delay && game.step < 3900 + delay && (game.step - delay) % 720 == 300){
    game.addAlien({code:15, level:0, crystal_drop:150, x: Math.cos(angle)*120, y: Math.sin(angle)*120}); //5 Yellow Hirsutes
  }
  if(game.step >= 3900 + delay && game.step < 7500 + delay && (game.step - delay) % 180 == 120){
    game.addAlien({code:16, level:2, crystal_drop:60, x: Math.cos(angle)*120, y: Math.sin(angle)*120}); //20 Red Piranhas
  }
  if(game.step == 7500 + delay){
    game.addAlien({code:20, level:1, crystal_drop:2000, x: Math.cos(angle)*120, y: Math.sin(angle)*120}); //20 Red Piranhas
  }
};

this.event = function(event,game){
  switch (event.name){
    case "alien_destroyed":
      if (event.alien.code == 11 && event.alien.level == 2){
        for(let i = 0; i<4; i++){
          game.addAlien({code:11,level:1, x:event.alien.x + event.alien.vy*3, y:event.alien.y - event.alien.vx*3, vx:event.alien.vy, vy:-1*event.alien.vx, crystal_drop:0});
        }
      }
      else if (event.alien.code == 16 && event.alien.level == 2){
        for(var i = 0; i<2; i++){
          game.addAlien({code:16,level:1, x:event.alien.x + event.alien.vy*3, y:event.alien.y - event.alien.vx*3, vx:event.alien.vy, vy:-1*event.alien.vx, crystal_drop:0});
        }
      }
    break;
  }
};

killasteroids = function(game){
  for(var i = 0; i < game.aliens.length; i++){
    game.asteroids[i].set({size:10, kill:true});
  }
};

killAllChickens = function(game){
  for(var i = 0; i < game.aliens.length; i++){
    if(game.aliens[i].code == 10){
      game.aliens[i].set({kill: true});
    }
  }
};