Beat JS Warrior!

jswarrior

var extensions = {
  low_hp: 9,
  check_actions: {
    'enemy': 'attack',
    'diamond': 'collect'
  },
  check_and_act: function (direction) {        
    var status = this.check(direction);
    if(this.check_actions.hasOwnProperty(status)) {
      var method = this.check_actions[status];
      this[method](direction);
      return status;
    }
    
    return false;
  },
  idle: function () {
     if (this.should_retreat()) {
      this.walk('backward');
     } else if (this.should_rest()) {
      this.rest();
     } else if (this.facing_wall()) {
       this.pivot();
     } else {
      this.walk();
    }
  },
  facing_wall: function () {
    return this.check('forward') == 'wall';
  },
  should_pursue: function () {
  },
  should_rest: function () {
    // not full health and didn't take dmg
    return this.getHealth() < 20 && this.last_health <= this.getHealth();
  },
  should_retreat: function () {
    // below low_hp and taking damage
    return this.last_health > this.getHealth() && this.getHealth() < this.low_hp;
  }
};

function maybe_extend_warrior(warrior) {
  for (var prop in extensions) {
    if (!warrior[prop]) {
      warrior[prop] = extensions[prop];
    }
  }
}

function reverse_until_diamond(warrior) {
  if (warrior.found_diamond) {
    return true;
  } else if (warrior.check_and_act('backward') == 'diamond') {
    warrior.found_diamond = true;
    return true;
  } 
  
  warrior.walk('backward');
  return false;
}

jsWarrior.turn = function(warrior) {
  maybe_extend_warrior(warrior);
  
  if (!warrior.check_and_act('forward') && !warrior.check_and_act('backward')) {
    warrior.idle();
  }
  warrior.last_health = warrior.getHealth();
};