class ImapServer
  class ClientHandler
    module Authenticate
      def handle_authenticate(msg:, user:)
        if msg.args.first == "PLAIN"
          handle_authenticate_plain(msg: msg)
        else
          msg.respond ServerMessage.new("NO invalid #{msg.args.first} arg, allowed PLAIN only", tag: msg.tag)
        end
      end

      private
      def handle_authenticate_plain(msg:)
        msg.respond ServerMessage.new("+", tag: nil)
        payload = msg.next(parse: false)
        _, username, password = payload.unpack("m").first.split("\x00")
        if msg.handler.authenticate_user!(username:, password:)
          msg.respond ServerMessage.new("OK connection succeed for #{username}", tag: msg.tag)
        else
          msg.respond ServerMessage.new("BAD connection failure for #{username}", tag: msg.tag)
        end
      end

    end
  end
end