oyster_card_proc_exercise.rb

# Below are two classes -FareCalculator and OysterCard calculator.
# Currently, the fare calculator simply looks up the fare based on the starting zone and ending zone
# and returns the result.
#
# For this exercise, add procs to the ZONE_TO_ZONE_FARES so that  if the journey is from zone 3 to 2 and the oyster card has a 
# season ticket, then the fare is 45 and the fare for zone 1 to 1 in they have an incomplete journey on the card, the maximum fare is charged 

class FareCalculator

  MAXIMUM_FARE = 666

  ZONE_TO_ZONE_FARES = {
    1 => {
      1 => 110,
      2 => 120,
      3 => 130
    },
    2 => {
      1 => 120,
      2 => 220,
      3 => 230
    },
    3 => {
      1 => 130,
      2 => 230,
      3 => 330
    }
  }


  def self.calculate(oyster, starting_zone, ending_zone)
    ZONE_TO_ZONE_FARES[starting_zone][ending_zone]
  end
end


class OysterCard
  def initialize(season_ticket: false, incomplete_journey: false)
    @season_ticket = season_ticket
    @incomplete_journey = incomplete_journey
  end

  def season_ticket?
    @season_ticket
  end

  def incomplete_journey?
    @incomplete_journey
  end

  def calculate_fare(starting_zone, ending_zone)
    FareCalculator.calculate(self, starting_zone, ending_zone)
  end
end

######### Expected results ###########################
o1 = OysterCard.new
puts o1.calculate_fare(3, 2)   # => 230

o2 = OysterCard.new(season_ticket: true)
puts o2.calculate_fare(3, 2)   # => 45

o3 = OysterCard.new(incomplete_journey: true)
puts o3.calculate_fare(3, 2)   # => 666