js Warrior

jsWarrior.js

jsWarrior.turn = function(warrior) {
  
  updateStatus(warrior);
    
  executeFirstAvailableCommand(
    warrior,
    [
      findDirection,
      attack,
      retreat,
      heal,
      collectTreasure,
      walk 
    ]);
  
  warrior.lastHealth = warrior.getHealth();
}

function updateStatus(warrior) {
  warrior.lastHealth = warrior.lastHealth || 20;
  warrior.isBlockedByWall = warrior.check() == "wall";
  warrior.canAttack = warrior.check() == "enemy";
  warrior.canCollectTreasure = warrior.check() == "diamond";
  warrior.hasLowHealth = warrior.getHealth() < 19;
  warrior.hasCriticalHealth = warrior.getHealth() < 10;
  warrior.isUnderAttack = warrior.getHealth() < warrior.lastHealth;
}
 
function executeFirstAvailableCommand(warrior, commands) {
  executeableCommands = commands.filter(whereCanExecute(warrior)); 
  executeableCommands[0].execute(warrior);
}
 
function whereCanExecute(warrior) { 
  return function(cmd) {
    return cmd.canExecute(warrior); 
  }
}

findDirection = {
  canExecute: function(warrior) { return warrior.isBlockedByWall },
  execute: function(warrior) { 
    warrior.pivot(); 
  }
}
 
attack = {
  canExecute: function(warrior) { return warrior.canAttack },
  execute: function(warrior) { warrior.attack(); }
};

retreat = {
  canExecute: function(warrior) { return warrior.isUnderAttack && warrior.hasCriticalHealth;  },
  execute: function(warrior) { warrior.walk("backward"); }
}

heal = {
  canExecute: function(warrior) { return warrior.hasLowHealth && !warrior.isUnderAttack;  },
  execute: function(warrior) { warrior.rest(); }
}

collectTreasure = {
  canExecute: function(warrior) { return warrior.canCollectTreasure; },
  execute: function(warrior) { warrior.collect(); }
}
 
walk = {
  canExecute: function(_warrior) { return true; },
  execute: function(warrior) { warrior.walk(); }
};