/*******************************************************************************
 *
 * Copyright (c) 2004-2010 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *
 *    Kohsuke Kawaguchi
 *
 *
 *******************************************************************************/ 

package hudson.model;

import hudson.model.Descriptor.FormException;
import hudson.util.CaseInsensitiveComparator;
import hudson.Indenter;
import hudson.Extension;
import hudson.views.ViewsTabBar;
import org.kohsuke.stapler.DataBoundConstructor;
import org.kohsuke.stapler.StaplerRequest;
import org.kohsuke.stapler.StaplerResponse;

import javax.servlet.ServletException;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 *
 * <h2>EXPERIMENTAL</h2> <p> The intention is to eventually merge this with the
 * {@link ListView}. This class is here for experimentation.
 *
 * <p> Until this class is sufficiently stable, there's no need for l10n.
 *
 * @author Kohsuke Kawaguchi
 */
public class TreeView extends View implements ViewGroup {

    /**
     * List of job names. This is what gets serialized.
     */
    private final Set<String> jobNames = new TreeSet<String>(CaseInsensitiveComparator.INSTANCE);
    /**
     * Nested views.
     */
    private final CopyOnWriteArrayList<View> views = new CopyOnWriteArrayList<View>();

    @DataBoundConstructor
    public TreeView(String name) {
        super(name);
    }

    /**
     * Returns {@link Indenter} that has the fixed indentation width. Used for
     * assisting view rendering.
     */
    public Indenter createFixedIndenter(String d) {
        final int depth = Integer.parseInt(d);
        return new Indenter() {
            protected int getNestLevel(Job job) {
                return depth;
            }
        };
    }

    /**
     * Returns a read-only view of all {@link Job}s in this view.
     *
     * <p> This method returns a separate copy each time to avoid concurrent
     * modification issue.
     */
    public synchronized List<TopLevelItem> getItems() {
        return Hudson.getInstance().getItems();
//        List<TopLevelItem> items = new ArrayList<TopLevelItem>(jobNames.size());
//        for (String name : jobNames) {
//            TopLevelItem item = Hudson.getInstance().getItem(name);
//            if(item!=null)
//                items.add(item);
//        }
//        return items;
    }

    public boolean contains(TopLevelItem item) {
        return true;
//        return jobNames.contains(item.getName());
    }

    public Item doCreateItem(StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
        Item item = Hudson.getInstance().doCreateItem(req, rsp);
        if (item != null) {
            jobNames.add(item.getName());
            owner.save();
        }
        return item;
    }

    @Override
    public synchronized void onJobRenamed(Item item, String oldName, String newName) {
        if (jobNames.remove(oldName) && newName != null) {
            jobNames.add(newName);
        }
        // forward to children
        for (View v : views) {
            v.onJobRenamed(item, oldName, newName);
        }
    }

    protected void submit(StaplerRequest req) throws IOException, ServletException, FormException {
    }

    public boolean canDelete(View view) {
        return true;
    }

    public void deleteView(View view) throws IOException {
        views.remove(view);
    }

    public Collection<View> getViews() {
        return Collections.unmodifiableList(views);
    }

    public View getView(String name) {
        for (View v : views) {
            if (v.getViewName().equals(name)) {
                return v;
            }
        }
        return null;
    }

    public void onViewRenamed(View view, String oldName, String newName) {
        // noop
    }

    public void save() throws IOException {
        owner.save();
    }

    public void doCreateView(StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException, FormException {
        checkPermission(View.CREATE);
        views.add(View.create(req, rsp, this));
        save();
    }

    // this feature is not public yet
    @Extension
    public static ViewDescriptor register() {
        if (Boolean.getBoolean("hudson.TreeView")) {
            return new DescriptorImpl();
        } else {
            return null;
        }
    }

    public static final class DescriptorImpl extends ViewDescriptor {

        public String getDisplayName() {
            return "Tree View";
        }
    }

    public ViewsTabBar getViewsTabBar() {
        return Hudson.getInstance().getViewsTabBar();
    }
}