package messagebroker.handlers;

import messagebroker.BaseMessageHandler;
import messagebroker.MessageHandlerContext;
import messagebroker.UnknownMessageFormatException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class AddHandlerMessageHandler extends BaseMessageHandler {
    private static final Logger LOGGER = LoggerFactory.getLogger(AddHandlerMessageHandler.class);
    private static final Pattern msgPattern = Pattern.compile("CONTROL\\.ADD_HANDLER (\\S+)$");

    public AddHandlerMessageHandler(MessageHandlerContext context) {
        super(context);
    }

    @Override
    public void handleMessage(String message) throws UnknownMessageFormatException {
        Matcher matcher = msgPattern.matcher(message);
        if (matcher.matches()) {
            String handlerName = matcher.group(1);
            LOGGER.info("Parsed handler name {}", handlerName);
            try {
                getContext().getBroker().addHandler(handlerName);
                sendResponse("OK");
                LOGGER.info("Added handler {} to broker.", handlerName);
            } catch (ReflectiveOperationException e) {
                String msg = "Unable to add handler";
                LOGGER.error(msg + "{}", e.toString(), e);
                sendResponse(msg);
            }
        } else {
            LOGGER.debug("Pattern \"{}\" does not match. Cannot handle message {}", msgPattern, message);
            super.handleMessage(message);
        }
    }

}