class PasswordGenerator
  def initialize(len=8,caps=true,digits=false)
    @length = len
    @caps = caps
    @digits = digits
    @onecon = ['b','c','d','f','g','h','j','k','l','m','n','p','r','s','t','v','w','x','z']
    @onevow = ['a','e','i','o','u']
    @onevow = [@onevow,@onevow].flatten
    @twovow = ['ee','oo','ai','ea','ia']
    @starttwocon = ['sh','ch','pr','tr','th','qu']
    @endtwocon = ['sh','ch','rt','rp','th','ss','tt','lz','ts','gs','gz','tz','gh','nd','ld','wd']
    @allstart = [@onecon,@onevow,@starttwocon,'y'].flatten
    @allend = [@onecon,@onevow,@endtwocon,'y'].flatten
    @allone = [@onecon,@onevow,'y'].flatten
    @alltwo = [@twovow,@starttwocon,@endtwocon].flatten
    @allcon = [@onecon,@starttwocon,@endtwocon,'y'].flatten
    @allvow = [@onevow,@twovow].flatten
  end
  def generatePassword
    pass = ''
    start = true
    while pass.length < (@length - 2) do
      if start
        pass = randElement(@allstart)
        i = (@onevow.include?(pass[-1,1]) ? 0 : 1)
        start = false
      end
      i += 1
      if (i % 2) == 0 # add vow next
        pass += randElement(@allvow)
      else # add con next
        pass += randElement(@allcon)
      end
      if rand(3) == 2 && @digits
        pass += rand(10).to_s
        start = true
      end
    end
    while pass.length < @length
      i += 1
      if (i % 2) == 0
        pass += randElement(@onevow)
      else
        if pass.length == (@length - 1)
          pass += randElement(@onecon)
        else
          temp = [@onecon,@endtwocon].flatten
          pass += randElement(temp)
        end
      end
    end
    pass
  end

  private

  def randElement(sounds)
    sound = sounds[rand(sounds.size)]
    return sound.upcase if @caps && rand(3) == 0
    return sound
  end
end

passgen = PasswordGenerator.new(8,true,true)
20.times { print(passgen.generatePassword+' ') }
print("\n")