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/*
 * Copyright © 2015 Geeoz, and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * it is in no manner primarily intended for or directed toward commercial
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package atom.kie;

import atom.app.Activity;
import atom.app.ActivityThread;
import atom.app.KieActivity;
import atom.view.CompositeController;
import atom.view.Controller;
import atom.view.JcrController;
import atom.view.ResourceBundleFilter;
import org.kie.api.runtime.process.WorkItem;
import org.kie.api.runtime.process.WorkItemManager;
import org.kie.internal.runtime.StatefulKnowledgeSession;

import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.Objects;

/**
 * Set Controller Task Work Item Handler with KIE session.
 *
 * @author Serge Voloshyn
 * @version 1.3 3/10/15
 */
public final class SetControllerTask extends AbstractControllerTask {
    /**
     * Default constructor with KIE session.
     *
     * @param ksession KIE session to use
     */
    public SetControllerTask(final StatefulKnowledgeSession ksession) {
        super(ksession);
    }

    @Override
    public void executeWorkItem(final WorkItem item,
                                final WorkItemManager manager) {
        final Activity activity =
                (Activity) getVariable(item, KieActivity.ACTIVITY);
        final Map parameters = item.getParameters();
        applyController(activity, parameters);
        applyEventListeners(
                activity, activity.getWindow().getContentView(), parameters);
        manager.completeWorkItem(item.getId(), item.getResults());
    }

    /**
     * Apply controller to the activity.
     *
     * @param activity   current activity
     * @param parameters task parameter
     */
    private void applyController(final Activity activity,
                                 final Map parameters) {

        final String bundle = (String) parameters.remove("bundle");
        final Locale activityLocale = getActivityLocale(activity);
        final Controller jcrNodeController = createController(activity,
                parameters, activityLocale);
        if (jcrNodeController == null && bundle == null) {
            return;
        }
        if (jcrNodeController == null) {
            activity.setController(ResourceBundleFilter.apply(
                    bundle, activityLocale, activity.getClassLoader()));
        } else if (bundle == null) {
            activity.setController(jcrNodeController);
        } else {
            activity.setController(CompositeController.apply(
                    ResourceBundleFilter.apply(bundle, activityLocale,
                            activity.getClassLoader()),
                    jcrNodeController));
        }
    }

    /**
     * Create JCR Node Controller.
     *
     * @param activity   current activity
     * @param parameters task parameter
     * @param locale     activity locale
     * @return new JCR Node Controller
     */
    private Controller createController(final Activity activity,
                                        final Map parameters,
                                        final Locale locale) {
        final Object prefix = parameters.remove("prefix");
        final String path = (String) parameters.remove("path");

        if (path == null || path.isEmpty()) {
            return null;
        }

        String jcrNodePath = Objects.toString(prefix, "")
                + path;
        final int lastNodeName = jcrNodePath.lastIndexOf('/');
        if (lastNodeName != -1 && isNotValidLocale(
                jcrNodePath.substring(lastNodeName + 1))) {
            jcrNodePath = jcrNodePath + "/" + locale.toString();
        }

        try {
            final Session session = activity.getJcrSession();
            final Node contentNode = session.getNode(jcrNodePath);
            return JcrController.apply(contentNode);
        } catch (RepositoryException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * Get Activity locale or Locale.ENGLISH as default.
     *
     * @param activity current activity
     * @return Activity locale or Locale.ENGLISH as default
     */
    private Locale getActivityLocale(final Activity activity) {
        final ActivityThread activityThread = activity.getActivityThread();
        if (activityThread != null && activityThread.getLocale() != null) {
            return activityThread.getLocale();
        } else {
            return Locale.ENGLISH;
        }
    }

    /**
     * Check whether locale tag is not valid locale.
     *
     * @param localeTag locale tag
     * @return whether locale tag is not valid locale.
     */
    private boolean isNotValidLocale(final String localeTag) {
        try {
            final Locale locale = Locale.forLanguageTag(localeTag);
            final String iso3Language = locale.getISO3Language();
            final String iso3Country = locale.getISO3Country();
            return iso3Language.trim().isEmpty()
                    || iso3Country.trim().isEmpty();
        } catch (MissingResourceException e) {
            return true;
        }
    }
}