class ImapServer
  class ClientHandler
    module Search

      # <sequence set>
      #    Messages with message sequence numbers corresponding to the
      #    specified message sequence number set.

      # BCC <string>
      #    Messages that contain the specified string in the envelope
      #    structure's BCC field.

      # BEFORE <date>
      #    Messages whose internal date (disregarding time and timezone)
      #    is earlier than the specified date.

      # BODY <string>
      #    Messages that contain the specified string in the body of the
      #    message.

      # CC <string>
      #    Messages that contain the specified string in the envelope
      #    structure's CC field.

      # FROM <string>
      #    Messages that contain the specified string in the envelope
      #    structure's FROM field.

      # HEADER <field-name> <string>
      #    Messages that have a header with the specified field-name (as
      #    defined in [RFC-2822]) and that contains the specified string
      #    in the text of the header (what comes after the colon).  If the
      #    string to search is zero-length, this matches all messages that
      #    have a header line with the specified field-name regardless of
      #    the contents.

      # KEYWORD <flag>
      #    Messages with the specified keyword flag set.

      # LARGER <n>
      #    Messages with an [RFC-2822] size larger than the specified
      #    number of octets.

      # ON <date>
      #    Messages whose internal date (disregarding time and timezone)
      #    is within the specified date.

      # SENTBEFORE <date>
      #    Messages whose [RFC-2822] Date: header (disregarding time and
      #    timezone) is earlier than the specified date.

      # SENTON <date>
      #    Messages whose [RFC-2822] Date: header (disregarding time and
      #    timezone) is within the specified date.

      # SENTSINCE <date>
      #    Messages whose [RFC-2822] Date: header (disregarding time and
      #    timezone) is within or later than the specified date.

      # SINCE <date>
      #    Messages whose internal date (disregarding time and timezone)
      #    is within or later than the specified date.

      # SMALLER <n>
      #    Messages with an [RFC-2822] size smaller than the specified
      #    number of octets.

      # SUBJECT <string>
      #    Messages that contain the specified string in the envelope
      #    structure's SUBJECT field.

      # TEXT <string>
      #    Messages that contain the specified string in the header or
      #    body of the message.

      # TO <string>
      #    Messages that contain the specified string in the envelope
      #    structure's TO field.

      # UNKEYWORD <flag>
      #    Messages that do not have the specified keyword flag set.

      # Example:
      # C: A282 SEARCH FLAGGED SINCE 1-Feb-1994 NOT FROM "Smith"
      # S: * SEARCH 2 84 882
      # S: A282 OK SEARCH completed
      # C: A283 SEARCH TEXT "string not in mailbox"
      # S: * SEARCH
      # S: A283 OK SEARCH completed
      # C: A284 SEARCH CHARSET UTF-8 TEXT {6}
      # C: XXXXXX
      # S: * SEARCH 43
      # S: A284 OK SEARCH completed
      # TODO: properly factorize the code so we get the UID and we can translate them into seq id

      def handle_search(msg:, user:)
        return msg.error_need_loggin if !user
        return msg.respond ServerMessage.new("BAD no selected mailbox", tag: msg.tag) if !msg.handler.selected

        handle_search_request(msg: msg, mailbox: msg.handler.selected)
      end

      private
      def handle_search_request(msg:, mailbox:)
        return msg.respond ServerMessage.new("KO mailbox #{mailbox_path} do not exists") if !mailbox

        msg.handler.selected = mailbox
        mutable_args = msg.args.dup
        mutable_args << "ALL" if mutable_args.empty?

        builder = Builder.new(mailbox)
        while (arg = mutable_args.shift)
          builder.apply_token!(arg, mutable_args)
        end
        mails_results = builder.conclude!

        results_uids = mails_results.map { _1.uid }.join(" ")
        msg.respond ServerMessage.new("SEARCH #{results_uids}")
        msg.respond ServerMessage.new("OK SEARCH completed", tag: msg.tag)
      end

      require_relative "search/builder"

    end
  end
end