class ImapServer
  class ClientHandler
    module Select

      # TODO: factorize with EXAMINE
      # S: * 172 EXISTS
      # S: * 1 RECENT
      # S: * OK [UNSEEN 12] Message 12 is first unseen
      # S: * OK [UIDVALIDITY 3857529045] UIDs valid
      # S: * OK [UIDNEXT 4392] Predicted next UID
      # S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
      # S: * OK [PERMANENTFLAGS (\Deleted \Seen \*)] Limited
      # S: A142 OK [READ-WRITE] SELECT completed
      def handle_select(msg:, user:)
        return msg.error_need_loggin if !user
        return msg.respond ServerMessage.new("BAD requires a folder name", tag: msg.tag) if msg.args.size != 1

        handle_selected_folder(msg: msg, user:, mailbox_path: msg.args.first)
      end

      FLAGS = %w[\\Answered \\Flagged \\Deleted \\Seen \\Draft].freeze
      FLAGS_STR = FLAGS.join(" ").freeze

      def handle_selected_folder(msg:, user:, mailbox_path:)
        mailbox = Mailbox.first(user: user, path: mailbox_path)
        return msg.respond ServerMessage.new("KO mailbox #{mailbox_path} do not exists") if !mailbox

        msg.handler.selected = mailbox
        msg.respond ServerMessage.new("OK #{mailbox.exists} EXISTS", tag: msg.tag)
        msg.respond ServerMessage.new("OK #{mailbox.recents} RECENTS", tag: msg.tag)
        msg.respond ServerMessage.new("OK #{mailbox.unseens} UNSEEN", tag: msg.tag)
        msg.respond ServerMessage.new("OK #{mailbox.id} UIDVALIDITY", tag: msg.tag)
        msg.respond ServerMessage.new("OK #{mailbox.mails_next_uid} UIDNEXT", tag: msg.tag)
        msg.respond ServerMessage.new("FLAGS (#{FLAGS_STR})", tag: msg.tag)
        msg.respond ServerMessage.new("OK SELECT completed", tag: msg.tag)
      end

    end
  end
end