class RuboCop::Server::Core

# File lib/rubocop/server/core.rb, line 22
def self.token
  @token ||= SecureRandom.hex(4)
end

# File lib/rubocop/server/core.rb, line 30
def start(host, port)
  $PROGRAM_NAME = "rubocop --server #{Cache.project_dir}"

  require 'rubocop'
  start_server(host, port)

  demonize if server_mode?
end

# File lib/rubocop/server/core.rb, line 26
def token
  self.class.token
end

# File lib/rubocop/server/core.rb, line 41
def demonize
  Cache.write_port_and_token_files(port: @server.addr[1], token: token)

  pid = fork do
    Process.daemon(true)
    $stderr.reopen(Cache.stderr_path, 'w')
    Cache.write_pid_file do
      read_socket(@server.accept) until @server.closed?
    end
  end

  Process.waitpid(pid)
end

# File lib/rubocop/server/core.rb, line 70
def read_socket(socket)
  SocketReader.new(socket).read!
rescue InvalidTokenError
  socket.puts 'token is not valid.'
rescue ServerStopRequest
  @server.close
rescue UnknownServerCommandError => e
  socket.puts e.message
rescue Errno::EPIPE => e
  warn e.inspect
rescue StandardError => e
  socket.puts e.full_message
ensure
  socket.close
end

# File lib/rubocop/server/core.rb, line 55
def server_mode?
  true
end

# File lib/rubocop/server/core.rb, line 59
def start_server(host, port)
  @server = TCPServer.open(host, port)

  # JSON format does not expected output message when IDE integration with server mode.
  # See: https://github.com/rubocop/rubocop/issues/11164
  return if use_json_format?

  output_stream = ARGV.include?('--stderr') ? $stderr : $stdout
  output_stream.puts "RuboCop server starting on #{@server.addr[3]}:#{@server.addr[1]}."
end

# File lib/rubocop/server/core.rb, line 86
def use_json_format?
  return true if ARGV.include?('--format=json') || ARGV.include?('--format=j')
  return false unless (index = ARGV.index('--format'))

  format = ARGV[index + 1]

  JSON_FORMATS.include?(format)
end