robot.js

'use strict';
function Robot() {
  this.x = null;
  this.y = null;
  this.orientation = null;
  this.maze = null;
}

Robot.prototype.setMaze = function (maze) {
  this.maze = maze;
  this.x = maze.startX;
  this.y = maze.startY;
  this.orientation = maze.startOrientation;
};

Robot.prototype.turnRight = function () {
  if(!this.maze || !this.maze.isValidDirection(this.orientation)){
    return false;
  }
  var rights = {
    north: 'east',
    east: 'south',
    south: 'west',
    west: 'north',
  }
  this.orientation = rights[this.orientation];
  return true;
}

Robot.prototype.turnLeft = function () {
  if(!this.maze || !this.maze.isValidDirection(this.orientation)){
    return false;
  }
  var lefts = {
    north: 'west',
    east: 'north',
    south: 'east',
    west: 'south',
  }
  this.orientation = lefts[this.orientation];
  return true;
}

Robot.prototype.moveForward = function () {
  if(!this.canMoveForward()){
    return false;
  }
  switch (this.orientation) {
    case 'north':
        this.y++;
        break;
    case 'east':
        this.x++;
        break;
    case 'south':
        this.y--;
        break;
    case 'west':
        this.x--;
        break;
  }
  return true;
}

Robot.prototype.canMoveForward = function (){
  if(!this.maze){
    return false;
  }
  return this.maze.canMove(this.x, this.y, this.orientation);
}

Robot.prototype.exitMaze = function (steps) {
  if(this.maze){
    while (steps != 0) {
      steps--;
      if (this.canMoveForward()) {
        this.moveForward();
        this.turnLeft();
      }else {
        this.turnRight();
      }
      if (this.x == this.maze.endX && this.y == this.maze.endY) {
        return true;
      }
    }
    return false;
    }

}