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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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package atom.app.kie;

import atom.app.Activity;
import atom.app.EventHandler;
import atom.app.KieActivity;
import atom.app.LocaleChangeEvent;
import atom.app.TemplateManager;
import atom.content.Context;
import atom.kie.AbstractTask;
import atom.view.ResourceBundleFilter;
import atom.widget.TextView;
import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapperBuilder;
import freemarker.template.ObjectWrapper;
import freemarker.template.SimpleHash;
import org.kie.api.runtime.process.WorkItem;
import org.kie.api.runtime.process.WorkItemManager;
import org.kie.internal.runtime.StatefulKnowledgeSession;

import java.util.Locale;
import java.util.ResourceBundle;

/**
 * Page template work item handler with KIE session.
 *
 * @author Alex Voloshyn
 * @version 1.6 3/10/15
 */
public final class PageTemplateWorkItemHandler extends AbstractTask {
    /**
     * Template manager service.
     */
    private static final TemplateManager MANAGER =
            Context.getSystemService(TemplateManager.class);
    /**
     * Activity for navigation bar.
     */
    private Activity activity = null;

    /**
     * Default constructor with KIE session.
     *
     * @param kieSession KIE session to use
     */
    public PageTemplateWorkItemHandler(
            final StatefulKnowledgeSession kieSession) {
        super(kieSession);
    }

    @Override
    public void executeWorkItem(final WorkItem item,
                                final WorkItemManager manager) {
        activity = (Activity) getVariable(item, KieActivity.ACTIVITY);
        final Locale locale = activity.getActivityThread().getLocale();
        final ResourceBundle strings = ResourceBundle.getBundle(
                "values.distribution", locale, activity.getClassLoader(),
                ResourceBundleFilter.utf8());
        final ObjectWrapper wrapper
                = new DefaultObjectWrapperBuilder(
                Configuration.getVersion()).build();
        final SimpleHash params = new SimpleHash(wrapper);
        params.put("context", item.getParameters());
        params.put("strings", strings);

        final String titleKey = (String) item.getParameter("title");
        final String title = String.format("templates/%s.ftl", titleKey);
        activity.setTitle(MANAGER.process(
                title, locale, params, activity.getClassLoader()));

        final String contentKey = (String) item.getParameter("content");
        final String content = String.format("templates/%s.ftl", contentKey);
        final TextView html = new TextView();
        html.setViewId(contentKey.replaceAll("/", "-"));
        html.setText(MANAGER.process(
                content, locale, params, activity.getClassLoader()));
        activity.setContentView(html);

        final LocaleChangeHandler handler =
                new LocaleChangeHandler(title, content, html, params);
        activity.registerEventHandler(LocaleChangeEvent.class, handler);
        manager.completeWorkItem(item.getId(), item.getResults());
    }

    @Override
    public void abortWorkItem(final WorkItem item,
                              final WorkItemManager manager) {
        manager.abortWorkItem(item.getId());
    }

    /**
     * Handler to switch the language of the Page Template.
     */
    private final class LocaleChangeHandler implements
            EventHandler {
        /**
         * Use serialVersionUID from JDK 1.0.2 for interoperability.
         */
        private static final long serialVersionUID = 4556134037566161690L;
        /**
         * Page Template title.
         */
        private final String newTitle;
        /**
         * Page Template content.
         */
        private final String newContent;
        /**
         * Text View for displaying content.
         */
        private final TextView contentView;
        /**
         * extra parameters for Template Manager.
         */
        private final SimpleHash newParams;

        /**
         * Constructor with parameters.
         *
         * @param title   Page Template title
         * @param content Page Template content
         * @param html    Text View for displaying content
         * @param params  extra parameters for Template Manager
         */
        private LocaleChangeHandler(final String title,
                                    final String content,
                                    final TextView html,
                                    final SimpleHash params) {
            newTitle = title;
            newContent = content;
            contentView = html;
            newParams = params;
        }

        @Override
        public void handle(final LocaleChangeEvent event) {
            final Locale newLocale = event.getLocale();
            //change the title and content according to new Locale
            activity.setTitle(MANAGER.process(
                    newTitle, newLocale, newParams, activity.getClassLoader()));
            contentView.setText(MANAGER.process(
                    newContent, newLocale,
                    newParams, activity.getClassLoader()));
        }
    }
}