class RGhost::PdfSecurity
  PERMISSION_VALUES = {
    base: -4,
    print: -4,
    modify: -8,
    copy: -16,
    annotate: -32,
    interactive: -256,
    copy_access: -512,
    assemble: -1024,
    high_quality_print: -2048,
    all: -3904

  }
  attr_accessor :owner_password, :user_password, :key_length
  def initialize
    @permission_value = PERMISSION_VALUES[:all]
    @key_lenght = 128
    @owner_password = "unknow"
    @user_password = "unknow"
  end

  def disable(*permissions)
    @permission_value = permissions.map { |p| PERMISSION_VALUES[p] }.inject(0) { |n, i| i += n }
  end

  def gs_params
    "-sOwnerPassword##{clear_space(@owner_password)} -sUserPassword##{clear_space(@user_password)} -dEncryptionR#3 -dKeyLength##{@key_lenght} -dPermissions##{@permission_value}"
  end

  private

  def clear_space(value)
    value.to_s.gsub(/([^\w])/, "")
  end
end