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package org.apache.juli.logging.ch.qos.logback.core.model.processor;

import java.util.Map;

import org.apache.juli.logging.ch.qos.logback.core.Appender;
import org.apache.juli.logging.ch.qos.logback.core.Context;
import org.apache.juli.logging.ch.qos.logback.core.joran.JoranConstants;
import org.apache.juli.logging.ch.qos.logback.core.model.AppenderRefModel;
import org.apache.juli.logging.ch.qos.logback.core.model.Model;
import org.apache.juli.logging.ch.qos.logback.core.spi.AppenderAttachable;

public class AppenderRefModelHandler extends ModelHandlerBase {
    boolean inError = false;

    public AppenderRefModelHandler(Context context) {
        super(context);
    }

    static public ModelHandlerBase makeInstance(Context context, ModelInterpretationContext ic) {
        return new AppenderRefModelHandler(context);
    }

    @Override
    protected Class getSupportedModelClass() {
        return AppenderRefModel.class;
    }

    @Override
    public void handle(ModelInterpretationContext interpContext, Model model) throws ModelHandlerException {

        Object o = interpContext.peekObject();

        if (!(o instanceof AppenderAttachable)) {
            inError = true;
            String errMsg = "Could not find an AppenderAttachable at the top of execution stack. Near "
                    + model.idString();
            addError(errMsg);
            return;
        }

        AppenderRefModel appenderRefModel = (AppenderRefModel) model;
        AppenderAttachable appenderAttachable = (AppenderAttachable) o;

        attachRefencedAppenders(interpContext, appenderRefModel, appenderAttachable);

    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    void attachRefencedAppenders(ModelInterpretationContext mic, AppenderRefModel appenderRefModel,
            AppenderAttachable appenderAttachable) {
        String appenderName = mic.subst(appenderRefModel.getRef());

        Map appenderBag = (Map) mic.getObjectMap().get(JoranConstants.APPENDER_BAG);

        Appender appender = appenderBag.get(appenderName);
        if (appender == null) {
            addError("Failed to find appender named [" + appenderName + "]");
        } else {
            addInfo("Attaching appender named [" + appenderName + "] to " + appenderAttachable);
            appenderAttachable.addAppender(appender);
        }

    }
}