class KPM::SystemProxy::EntropyAvailable

def build_hash(data)
  entropy_available = {}
  entropy_available['entropy_available'] = { entropy: 'available', value: data }
  entropy_available
end

def fetch
  entropy_available = nil
  if OS.windows?
    entropy_available = fetch_windows
  elsif OS.linux?
    entropy_available = fetch_linux
  elsif OS.mac?
    entropy_available = fetch_mac
  end
  entropy_available
end

def fetch_linux
  entropy_available_data = `cat /proc/sys/kernel/random/entropy_avail 2>&1`.gsub("\n", '')
  build_hash(entropy_available_data)
end

def fetch_mac
  build_hash('-')
end

def fetch_windows
  build_hash('-')
end

def initialize
  @entropy_available = fetch
  @labels = [{ label: :entropy },
             { label: :value }]
end