rover.rb

class Rover
  attr_accessor :max_size_of_plateau, :initial_position_of_rover, :current_position_of_rover
  @@directionHash = {
    :N_L => "W",
    :W_L => "S",
    :S_L => "E",
    :E_L => "N",
    :N_R => "E",
    :W_R => "N",
    :S_R => "W",
    :E_R => "S",
    :N_M => "N",
    :W_M => "W",
    :S_M => "S",
    :E_M => "E"
  }
  def initialize max_size_of_plateau, initial_position_of_rover
    self.current_position_of_rover = initial_position_of_rover
  end
  
  def update_position instruction
    self.update_direction instruction
    if instruction == 'M'
      self.move_rover instruction
    end
  end
  def move_rover_towards_north
    self.current_position_of_rover[:y] = self.current_position_of_rover[:y] + 1
  end
  def move_rover_towards_south
    self.current_position_of_rover[:y] = self.current_position_of_rover[:y] - 1
  end
  def move_rover_towards_east
    self.current_position_of_rover[:x] = self.current_position_of_rover[:x] + 1
  end
  def move_rover_towards_west
    self.current_position_of_rover[:x] = self.current_position_of_rover[:x] - 1
  end


  def move_rover instruction
    moveHash = {
      "N" => "north",
      "S" => "south",
      "W" => "west",
      "E" => "east"
    }
    self.send("move_rover_towards_#{moveHash[self.current_position_of_rover[:direction]]}")
  end

  def update_direction instruction
    direction = @@directionHash["#{self.current_position_of_rover[:direction]}_#{instruction}".to_sym]
    self.current_position_of_rover[:direction] = direction
  end

  def calculate_final_position(instruction_set)
    instruction_set = instruction_set.split(//)
    instruction_set.each do  |instruction|
      self.update_position instruction
    end
    self.current_position_of_rover
  end
end