## Chapter 9 ##

### Improved ask method

#!/usr/bin/ruby

    def set_defaults
      if RUBY_PLATFORM =~ /linux|i686-darwin9/ then
         system "clear"
         terminal_size = `stty size`.split.map { |x| x.to_i }.reverse
         line_width = terminal_size[0]
      elsif RUBY_PLATFORM =~ /mswin32/ then
         system "cls"
         line_width = 90
      else
         line_width = 90
      end
         line_width
    end

    def randomize_array(arr)
       arr.sort_by{rand}
    end

    def get_random_item(arr)
       seed = rand(arr.length-1)
       arr[seed]
    end

    def hr(width,char='_')
          puts char.center(width,char)
    end

    def ask question
        while true
          puts question
            case gets.chomp.downcase
                when 'yes' then
                        if question.rindex(/bed/) == nil
                           $order.push question.sub(/\?/,'').scan(/\b\w*$/).join
                        end
                        return true
                when 'no'  then return false
                else puts 'Please answer "yes" or "no"'
            end
        end
    end

    food     = ["tacos","burritos","chimichangas","sopapillas","flautas"]
    drinks   = ["horchata","margaritas","tequila"]
    personal = ["wet the bed"]
    line_width = set_defaults
    hr(line_width)
    puts 'Hello stranger. Welcome to "El Taco Grande"'.center(line_width)
    puts 'We have some sugestions on our menu'.center(line_width)
    hr(line_width)
    puts

    random_food = randomize_array(food)

    $order = []

    food.each do |item|
       ask "Do you like #{item}?"
       if item == random_food[0]
               ask "Do you #{get_random_item(personal)}"
       elsif item == random_food[1]
               ask "Do you like drinking #{get_random_item(drinks)}"
       end
    end

    set_defaults
    puts
    puts "DEBRIEFING:"
    hr(line_width,"=")
    puts 'THANK YOU!'.center(line_width)
    hr(line_width)
    puts "Order details".center(line_width)
    $order.each do |item|
       puts item.center(line_width)
    end
    hr(line_width)
    puts
    puts "your order will be ready in 45 minutes!".center(line_width)
    puts
    hr(line_width)


### Old-school Roman numerals

   def set_defaults
       if RUBY_PLATFORM =~ /linux|i686-darwin9/ then
          system "clear"
          terminal_size = `stty size`.split.map { |x| x.to_i }.reverse
          line_width = terminal_size[0]
       elsif RUBY_PLATFORM =~ /mswin32/ then
           system "cls"
           line_width = 90
       else
           line_width = 90
       end
           line_width
    end

    def arabic_to_roman number

        if number <=0 || number>3000
                return "The entered value can not be represented as a Roman Number"
        end

        roman_numeral = ""
        numbers_equiv = [[1000,"M"],[500,"D"],[100,"C"],[50,"L"],[10,"X"],[5,"V"],[1,"I"]]
        roman_set = [0,0,0,0,0,0,0]

        numbers_equiv.each_index do |set|
           if number >= numbers_equiv[set][0]
              roman_set[set] = number/numbers_equiv[set][0]
              number -= roman_set[set]*numbers_equiv[set][0]
           end
        end

        roman_set.each_index do |current|
           roman_set[current].times { roman_numeral += numbers_equiv[current][1] }
        end
        "Your Roman Number is: #{roman_numeral}"
    end

    line_width = set_defaults

    while true
        puts "_".center(line_width,"_")
        puts "Enter a number to convert".center(line_width)
        puts "to exit type [x]".center(line_width)
        puts "_".center(line_width,"_")
        puts
        print "Number: "
        num = gets.chomp
        if num == 'x'
           set_defaults
           puts "Bye!"
           break
        end
        set_defaults
        puts "_".center(line_width,"_")
        puts "  #{arabic_to_roman num.to_i}  ".center(line_width,"#")
        puts "_".center(line_width,"_")
        puts
    end


### Modern Roman numerals

    $line_width = 90

    def set_defaults
       if RUBY_PLATFORM =~ /linux|i686-darwin9/ then
          system "clear"
          terminal_size = `stty size`.split.map { |x| x.to_i }.reverse
          $line_width = terminal_size[0]
       elsif RUBY_PLATFORM =~ /mswin32/ then
           system "cls"
       end
    end

    def arabic_to_roman number
        if number <=0 || number>3000
           return "The entered value can not be represented as a Roman Number"
        end
        roman_numeral = ""
        # I Like Arrays
        numbers_equiv = [
           [1000,"M"],
           [900,"CM"],
           [500,"D"],
           [400,"CD"],
           [100,"C"],
           [90,"XC"],
           [50,"L"],
           [40,"XL"],
           [10,"X"],
           [9,"IX"],
           [5,"V"],
           [4,"IV"],
           [1,"I"]
        ]
        # Maybe in this one, I should used the {X=>"Y"} syntaxist, but ... nhe... latter
        numbers_equiv.each do |set|
           if number >= set[0]
              to_roman = number.divmod(set[0])
              roman_numeral += set[1]*to_roman[0]
              number = to_roman[1]
           end
        end
        "Your Roman Number is: #{roman_numeral}"
    end

    set_defaults

    while true
        puts "_".center($line_width,"_")
        puts "Enter a number to convert".center($line_width)
        puts "to exit type [x]".center($line_width)
        puts "_".center($line_width,"_")
        puts
        print "Number: "
        num = gets.chomp
        if num == 'x'
           set_defaults
           puts "Bye!"
           break
        end
        set_defaults
        puts "_".center($line_width,"_")
        puts "  #{arabic_to_roman num.to_i}  ".center($line_width,"#")
        puts "_".center($line_width,"_")
        puts
    end