class Room
    attr_accessor :contents, :description
end

class Contents
    attr_accessor :contents
    def initialize contents
        @contents = contents
    end
end

class Player
    attr_accessor :inventory
end

class Map
    def initialize
        airlock1 = Room.new
        airlock1.description = "The airlock of a space station. It contains:"
        airlock1.contents = Contents.new ["Spacesuit", "Clipboard", "Flashlight"]

        science_lab = Room.new
        science_lab.description = "You're in the science lab. It contains:"
        science_lab.contents = Contents.new ["Plasma Cutter", "Chemicals", "USB Drive"]

        mess_hall = Room.new
        mess_hall.description = "You're in the mess hall. It contains:"

        crew_quarters = Room.new
        crew_quarters.description = "You're in the crew quarters. It contains:"

        @map = [[airlock1, science_lab],[mess_hall, crew_quarters]]
        @current_room_position = [0,0]
    end

    def move direction
        case direction
            when "UP"
                if  @current_room_position [0] > 0
                    @current_room_position [0] -= 1
                end
            when "DOWN"
                if  @current_room_position [0] < @map[0].size-1
                    @current_room_position [0] += 1
                end
            when "LEFT" # unimpemented
            when "RIGHT" #unimplemented
        end
        puts @map[@current_room_position[0]][@current_room_position[1]].description
    end
end
map = Map.new
while input = gets.chomp()
    map.move(input)
end