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# Ruby Quiz 2 - Scalable LCD Monitor 
# Gerard (smeevil) de Brieder - Govannon - 2008-06-12

class Lcd
  attr_accessor :line
    
  def initialize(numbers,scale)
    
    total_lines=5+((scale-1)*2) #compute the total output lines needed for scale (minimal 5)
    
    @lines=Array.new # build and reserve array spaces for the output lines
    total_lines.times do
      @lines << ""
    end
    
    @scale=scale
    numbers.scan(/./).each { |number| number_builder(get_number_sequence(number)) } 
  end

  def get_number_sequence(number) #converts a given number to a sequence used by number_builder
    
    case number
      when "0" then @sequence="24142"
      when "1" then @sequence="15151"
      when "2" then @sequence="25232"
      when "3" then @sequence="25252"
      when "4" then @sequence="14251"
      when "5" then @sequence="23252"
      when "6" then @sequence="23242"
      when "7" then @sequence="25151"
      when "8" then @sequence="24242"
      when "9" then @sequence="24252"
    end
    
    @result=''
        
    @sequence.scan(/./).each_with_index { |seq,index|
      @result+=seq
      unless index%2==0 #add extra chars for the bigger scale lcd
        (@scale-1).times{ @result+=seq }
      end
    }

    return @result    
  end
  
  def number_builder(sequence) #creates an lcd number from a given sequence and adds it to the lines array
    
    dashes=""
    spaces=""
    @scale.times do #define spaces and vertical dash size for scale
      dashes+="-"
      spaces+=" "
    end
    
    sequence.scan(/./).each_with_index do |s,i| #create the lcd number 
        case s
          when "1" then @lines[i]+=" #{spaces}  "
          when "2" then @lines[i]+=" #{dashes}  "
          when "3" then @lines[i]+="|#{spaces}  "
          when "4" then @lines[i]+="|#{spaces}| "
          when "5" then @lines[i]+=" #{spaces}| "  
        end
    end
  end
  
  def print
    @lines.each { |line| puts line unless line==''}
  end
end

def check_arguments
  
  if ARGV[0]=~/^\d+$/ 
    @scale="1"
    @number=ARGV[0]
  end

  if ARGV[0]=~/^-s$/ 
    @scale=ARGV[1]
    @number=ARGV[2]
  end

  @scale && @number && @number=~/^\d+$/ ? true : false #are all arguments accepted ?
end

########### MAIN ##############

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if check_arguments
  @lcd=Lcd.new(@number,@scale.to_i)
  @lcd.print
else
  print "
    LCD DISPLAY
    ===========
    usage         : quiz2 -s <scale> <number>
    example       : quiz2 -s 2 12345
    -s <scale>     -s is optional
  "
end