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August 20, 2020 13:23
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Mars Rover Problem with Flyweight pattern
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class Plateau | |
attr_accessor :max_x, :max_y, :direction | |
def initialize(x, y, direction = :n) | |
@max_x = x.to_i | |
@max_y = y.to_i | |
@direction = direction.downcase.to_sym | |
end | |
def land(position) | |
puts 'Rover landed' | |
end | |
end | |
class Rover | |
attr_accessor :name, :location, :directions, :plateau | |
def initialize(name) | |
@name = name | |
end | |
def start | |
check_plateau | |
directions.each do |d| | |
move_possible? if d == 'M' | |
location.send(location.mapper[d.to_sym]) | |
end | |
end | |
def check_plateau | |
puts 'Checking if plateau exists' | |
puts "Location: #{location.inspect}" | |
puts "Plateau: #{plateau.inspect}" | |
raise 'Rover is out of region' if !plateau || (plateau && (plateau.max_x < location.x) || (plateau.max_y < location.y)) | |
end | |
def move_possible? | |
puts 'Checking if move is with in plateau' | |
end | |
end | |
class RoverFactory | |
attr_accessor :rovers | |
def initialize | |
@rovers = {} | |
end | |
def find_rover(name) | |
if [email protected]_key?(name) | |
@rovers[name] = Rover.new(name) | |
end | |
@rovers[name] | |
end | |
def total_number_of_rovers | |
@rovers.size | |
end | |
end | |
class Location | |
LEFT = { | |
n: :w, | |
e: :n, | |
s: :e, | |
w: :s | |
} | |
RIGHT = { | |
n: :e, | |
e: :s, | |
s: :w, | |
w: :n | |
} | |
attr_accessor :x, :y, :direction | |
def initialize(x = 0, y = 0, direction = :n) | |
@x = x.to_i | |
@y = y.to_i | |
@direction = direction.downcase.to_sym | |
end | |
def turn_left | |
@direction = LEFT[@direction] | |
end | |
def turn_right | |
@direction = RIGHT[@direction] | |
end | |
def move | |
case @direction | |
when :n | |
@y += 1 | |
when :e | |
@x += 1 | |
when :s | |
@y -= 1 | |
when :w | |
@x -= 1 | |
end | |
end | |
def mapper | |
{ | |
L: 'turn_left', | |
R: 'turn_right', | |
M: 'move' | |
} | |
end | |
end | |
class Operation | |
def initialize | |
@rover_factory = RoverFactory.new | |
end | |
def deploy(plateau, name, input) | |
position = input[0].split | |
directions = input[1].split(//).reject(&:empty?) | |
rover = @rover_factory.find_rover(name) | |
rover.location = Location.new(position[0], position[1], position[2]) | |
rover.directions = directions | |
rover.plateau = plateau | |
rover.start | |
end | |
def execute | |
input = gets("\n\n").chomp | |
input = input.split("\n").reject(&:empty?) | |
area = input.shift | |
area = area.split | |
plateau = Plateau.new(area[0], area[1]) | |
inputs = input.each_slice(2).to_a | |
inputs.each_with_index { |input, index| deploy(plateau, "Rover #{index}", input) } | |
end | |
def status | |
@rover_factory.rovers.each do |key, value| | |
puts "#{value.name}, location: #{value.location.inspect}" | |
end | |
end | |
end | |
opt = Operation.new | |
opt.execute | |
opt.status |
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