class MultRomanNum

# File lib/multiplicative_roman_numerals.rb, line 4
def initialize
  @special = [["CM", 900], ["CD" ,  400], ["XC" ,  90], ["XL" ,  40],
    ["IX" ,  9], ["IV" ,  4]]
  @terminals = [["M" ,  1000], ["D" ,  500], ["C" ,  100], ["L" ,  50],
    ["X" ,  10], ["V" ,  5], ["I" ,  1]]
  @multiplier = [["* " ,  0]]
  @lang = @terminals.concat(@special).sort{ |x,y|
    y[1] <=> x[1]
  }
end

# File lib/multiplicative_roman_numerals.rb, line 45
def int_to_roman(input)
  result = ""

  @lang.each_index{ |i|
    val = @lang[i][1]
    key = @lang[i][0]
    x = input/val
    if x > 0
      x.times do
        result += key.to_s
      end
      input -= x*val
    end
  }

  result
end

# File lib/multiplicative_roman_numerals.rb, line 15
def roman_to_int(input)
  result = 0
  inputArr = input.split("")

  lookahead = []
  inputArr.each_with_index do |val, i|
    if lookahead != []
      lookahead = []
      next
    end

    if input[i+1] != nil
      conc = val + input[i+1]
      lookahead = @special.select{
        |s| s.include? conc
      }
    end

    if lookahead != []
      result += lookahead[0][1]
    else
      result += @terminals.select{
        |s| s.include? val
      }[0][1]
    end
  end

  result
end