module Status

# File lib/whimsy/asf/status.rb, line 16
def self.active?
  Resolv::DNS.open do |rs|
    active = rs.getaddress(ACTIVE_HOSTNAME) # Official hostname as IP; might change during run
    begin
      @currentIP ||= rs.getaddress(hostname) # local as IP; should not change during a run
    rescue Resolv::ResolvError => e # allow this to fail on a test node
      raise unless testnode?
      $stderr.puts "WARNING: Failed to resolve local IP address: #{e}"
    end
    return @currentIP == active
  end
end

# File lib/whimsy/asf/status.rb, line 70
def self.activeIP # intended for CLI testing
  Resolv::DNS.open.getaddress(ACTIVE_HOSTNAME)
end

# File lib/whimsy/asf/status.rb, line 106
def self.banner
  link = nil
  msg = updates_disallowed_reason
  return {msg: msg, href: nil} if msg
  msg, link = notice
  return {msg: msg, href: link} if msg
  return nil
end

# File lib/whimsy/asf/status.rb, line 59
def self.currentIP # intended for CLI testing
  Resolv::DNS.open do |rs|
    begin
      @currentIP ||= rs.getaddress(hostname) # local as IP; should not change during a run
    rescue Resolv::ResolvError => e # allow this to fail on a test node
      raise unless testnode?
      $stderr.puts "WARNING: Failed to resolve local IP address: #{e}"
    end
  end
end

# File lib/whimsy/asf/status.rb, line 30
def self.hostname
  @hostname ||= Socket.gethostname
  @hostname
end

# File lib/whimsy/asf/status.rb, line 36
def self.migrating? # This is used to disable updates, see self.updates_disallowed_reason
  File.exist? '/srv/whimsy/migrating.txt' # default is false
end

# File lib/whimsy/asf/status.rb, line 75
def self.notice
  path =  '/srv/whimsy/www/notice.txt' # as file path
  link = '/notice.txt' # as relative URL
  if File.exist? path
    begin
      File.open(path) do |fh|
        txt = fh.readline.chomp
        # These classes should agree with the script in index.html
        case txt.split(':',2).first
        when 'DANGER', 'BEWARE'
          cls = 'bg-danger'
        when 'WARNING'
          cls = 'bg-warning'
        when 'INFO'
          cls = 'bg-info'
        else
          cls = 'bg-light'
        end
        return txt, link, cls
      end
    rescue EOFError
    end
  end
  nil
end

# File lib/whimsy/asf/status.rb, line 41
def self.testnode?
  # Assume test nodes are not called whimsy...[.apache.org]
  hostname !~ %r{^whimsy.*(\.apache\.org)?$}
end

# File lib/whimsy/asf/status.rb, line 51
def self.updates_disallowed_reason
  return 'Updates unavailable due to migration.' if migrating?
  return nil if testnode?
  return 'Updates unavailable on this node. Please ensure you have logged in to the correct host.' unless active?

  nil
end