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

import org.apache.james.imap.api.ImapCommand;
import org.apache.james.imap.api.ImapConstants;
import org.apache.james.imap.api.ImapMessage;
import org.apache.james.imap.api.display.HumanReadableText;
import org.apache.james.imap.api.process.ImapSession;
import org.apache.james.imap.decode.DelegatingImapCommandParser;
import org.apache.james.imap.decode.ImapCommandParser;
import org.apache.james.imap.decode.ImapCommandParserFactory;
import org.apache.james.imap.decode.ImapRequestLineReader;
import org.apache.james.imap.decode.base.AbstractImapCommandParser;
import org.apache.james.protocols.imap.DecodingException;

/**
 * Parse UID commands
 */
public class UidCommandParser extends AbstractImapCommandParser implements DelegatingImapCommandParser {

    private ImapCommandParserFactory parserFactory;

    public UidCommandParser() {
        super(ImapCommand.selectedStateCommand(ImapConstants.UID_COMMAND_NAME));
    }

    /**
     * @see org.apache.james.imap.decode.DelegatingImapCommandParser#getParserFactory()
     */
    public ImapCommandParserFactory getParserFactory() {
        return parserFactory;
    }

    /**
     * @see org.apache.james.imap.decode.DelegatingImapCommandParser#setParserFactory(ImapCommandParserFactory)
     */
    public void setParserFactory(ImapCommandParserFactory imapCommandFactory) {
        this.parserFactory = imapCommandFactory;
    }

    /**
     * @see
     * org.apache.james.imap.decode.base.AbstractImapCommandParser#decode(org.apache.james.imap.api.ImapCommand,
     * org.apache.james.imap.decode.ImapRequestLineReader, java.lang.String,
     * org.apache.james.imap.api.process.ImapSession)
     */
    protected ImapMessage decode(ImapCommand command, ImapRequestLineReader request, String tag, ImapSession session) throws DecodingException {
        // TODO: check the logic against the specification:
        // TODO: suspect that it is now bust
        // TODO: the command written may be wrong
        // TODO: this will be easier to fix a little later
        // TODO: also not sure whether the old implementation shares this flaw
        String commandName = request.atom();
        ImapCommandParser helperCommand = parserFactory.getParser(commandName);
        // TODO: replace abstract class with interface
        if (helperCommand == null || !(helperCommand instanceof AbstractUidCommandParser)) {
            throw new DecodingException(HumanReadableText.ILLEGAL_ARGUMENTS, "Invalid UID command: '" + commandName + "'");
        }
        final AbstractUidCommandParser uidEnabled = (AbstractUidCommandParser) helperCommand;
        final ImapMessage result = uidEnabled.decode(request, tag, true, session);
        return result;
    }

}