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package org.apache.james.imap.decode.base;

import org.apache.james.imap.api.ImapCommand;
import org.apache.james.imap.api.ImapMessage;
import org.apache.james.imap.api.Tag;
import org.apache.james.imap.api.display.HumanReadableText;
import org.apache.james.imap.api.message.response.StatusResponse;
import org.apache.james.imap.api.message.response.StatusResponseFactory;
import org.apache.james.imap.api.process.ImapSession;
import org.apache.james.imap.decode.DecodingException;
import org.apache.james.imap.decode.ImapCommandParser;
import org.apache.james.imap.decode.ImapRequestLineReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 * Note:
 * 
 */
public abstract class AbstractImapCommandParser implements ImapCommandParser {

    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractImapCommandParser.class);

    private final ImapCommand command;

    private final StatusResponseFactory statusResponseFactory;

    public AbstractImapCommandParser(ImapCommand command, StatusResponseFactory statusResponseFactory) {
        this.command = command;
        this.statusResponseFactory = statusResponseFactory;
    }

    public ImapCommand getCommand() {
        return command;
    }

    protected StatusResponse taggedNo(Tag tag, ImapCommand command, HumanReadableText displayTextKey, StatusResponse.ResponseCode code) {
        return statusResponseFactory.taggedNo(tag, command, displayTextKey, code);
    }

    /**
     * Parses a request into a command message for later processing.
     * 
     * @param request
     *            ImapRequestLineReader, not null
     * @return ImapCommandMessage, not null
     */
    @Override
    public final ImapMessage parse(ImapRequestLineReader request, Tag tag, ImapSession session) {
        if (command.validForState(session.getState())) {
            try {
                return decode(request, tag, session);
            } catch (DecodingException e) {
                LOGGER.debug("Cannot parse protocol ", e);
                return statusResponseFactory.taggedBad(tag, command, e.getKey());
            }
        }
        return statusResponseFactory.taggedNo(tag, command, HumanReadableText.INVALID_COMMAND);
    }

    /**
     * Parses a request into a command message for later processing.
     *
     * @param request
     *            ImapRequestLineReader, not null
     * @param tag
     *            command tag, not null
     * @param session
     *            imap session
     * @return ImapCommandMessage, not null
     * @throws DecodingException
     *             if the request cannot be parsed
     */
    protected abstract ImapMessage decode(ImapRequestLineReader request, Tag tag, ImapSession session) throws DecodingException;

}