/*
 * This file is part of McIDAS-V
 *
 * Copyright 2007-2015
 * Space Science and Engineering Center (SSEC)
 * University of Wisconsin - Madison
 * 1225 W. Dayton Street, Madison, WI 53706, USA
 * https://www.ssec.wisc.edu/mcidas
 * 
 * All Rights Reserved
 * 
 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
 * some McIDAS-V source code is based on IDV and VisAD source code.  
 * 
 * McIDAS-V is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * McIDAS-V is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser Public License
 * along with this program.  If not, see http://www.gnu.org/licenses.
 */

package edu.wisc.ssec.mcidasv.ui;

import java.util.List;

import javax.swing.JComponent;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import ucar.unidata.idv.IntegratedDataViewer;
import ucar.unidata.idv.ui.IdvComponentHolder;
import ucar.unidata.idv.ui.IdvUIManager;
import ucar.unidata.idv.ui.IdvXmlUi;
import ucar.unidata.idv.ViewManager;
import ucar.unidata.util.WrapperException;
import ucar.unidata.xml.XmlUtil;

/**
 * McIDAS-V needs its own ComponentHolder merely to associate ViewManagers with
 * their parent ComponentHolders. This association is later used in
 * McIDASVViewPanel to create a "hierarchical name" for each ViewManager.
 * 
 * <p>
 * Instead of having something like "Panel 1" appearing in the layer controls,
 * we now have "ComponentHolder Name>Panel 1". Note: ComponentHolder names
 * always double as tab names! McV also intercepts ComponentHolder renaming and
 * updates the layer controls instantly.
 * </p>
 */
public class McvComponentHolder extends IdvComponentHolder {

    /** IDV friendly description of a dynamic XML skin. */
    public static final String CATEGORY_DESCRIPTION = "UI Skin";

    /** Used to distinguish a dynamic skin from other things. */
    public static final String TYPE_DYNAMIC_SKIN = "dynamicskin";

//    private static Logger logger = LoggerFactory.getLogger(McvComponentHolder.class);

//    private Map<String, ViewManager> dynamicViewManagers = new HashMap<String, ViewManager>();

    /** Kept around to avoid annoying casting. */
    private UIManager uiManager;

    private JComponent cached = null;

    /**
     * Default constructor for serialization.
     */
    public McvComponentHolder() {
    }

    /**
     * Fairly typical constructor.
     * 
     * @param idv Reference to the main IDV object.
     * @param obj object being held in this component holder.
     */
    public McvComponentHolder(IntegratedDataViewer idv, Object obj) {
        super(idv, obj);
        uiManager = (UIManager)idv.getIdvUIManager();
    }

    /**
     * Overridden so that we can (one day) do the required extra work to write
     * out the XML for this skin.
     * 
     * @param doc Parent document we'll use for XML generation.
     * 
     * @return XML representation of what is being held.
     */
    @Override public Element createXmlNode(Document doc) {
        if (!getType().equals(TYPE_DYNAMIC_SKIN)) {
            return super.createXmlNode(doc);
        }

        // keep in mind that the IDV expects that we're holding a path
        // to a skin... I don't think that this will work how you want it...
        // TODO: investigate this!
        Element node = doc.createElement(IdvUIManager.COMP_COMPONENT_SKIN);
        node.setAttribute("url", getObject().toString());

        /*
         * try { System.err.println(XmlUtil.toString((Element)getObject())); }
         * catch (Exception e) { e.printStackTrace(); }
         */

        return node;
    }

    /**
     * Overridden so that McV can do the required extra work if this holder is
     * holding a dynamic XML skin.
     * 
     * @return Contents of this holder as a UI component.
     */
    @Override public JComponent doMakeContents() {
        JComponent contents;
        if (!getType().equals(TYPE_DYNAMIC_SKIN)) {
            contents = super.doMakeContents();
        } else {
            contents = makeDynamicSkin();
        }
//        contents.addComponentListener(new ComponentListener() {
//            @Override public void componentHidden(ComponentEvent e) {
//                logger.trace("component hidden");
//                GuiUtils.toggleHeavyWeightComponents(contents, false);
//            }
//            @Override public void componentShown(ComponentEvent e) {
//                logger.trace("component shown");
//                GuiUtils.toggleHeavyWeightComponents(contents, false);
//            }
//            @Override public void componentMoved(ComponentEvent e) {}
//            @Override public void componentResized(ComponentEvent e) {}
//        });
        return contents;
    }

    /**
     * Lets the IDV take care of the details, but does null out the local
     * reference to the UIManager.
     */
    @Override public void doRemove() {
        super.doRemove();
        uiManager = null;
    }

    /**
     * Overridden so that McV can return a more accurate category if this holder
     * is holding a dynamic skin.
     * 
     * @return Category name for the type of thing we're holding.
     */
    @Override public String getCategory() {
        if (!getType().equals(TYPE_DYNAMIC_SKIN)) {
            return super.getCategory();
        }
        return CATEGORY_DESCRIPTION;
    }

    /**
     * Overridden so that McV can return a more accurate description if this
     * holder is holding a dynamic skin.
     * 
     * @return The description of what is being held.
     */
    @Override public String getTypeName() {
        if (!getType().equals(TYPE_DYNAMIC_SKIN)) {
            return super.getTypeName();
        }
        return CATEGORY_DESCRIPTION;
    }

    /**
     * If the object being held in this component holder is a skin, calling this
     * method will create a component based upon the skin.
     * 
     * <p>
     * Overridden so that McV can tell the UIManager to associate the skin's
     * ViewManagers with this component holder. That association is used to
     * build the hierarchical names in the ViewPanel.
     * </p>
     * 
     * @return The component represented by this holder's skin.
     */
    @Override protected JComponent makeSkin() {
        JComponent comp = super.makeSkin();

        // let's hope that *getViewManagers* only gives us a list of 
        // ViewManagers
        @SuppressWarnings("unchecked")
        List<ViewManager> vms = getViewManagers();
        if (vms != null) {
            for (int i = 0; i < vms.size(); i++) {
                uiManager.setViewManagerHolder(vms.get(i), this);
                uiManager.getViewPanel().viewManagerChanged(vms.get(i));
            }
        }
        return comp;
    }

    /**
     * Mostly used to ensure that the local reference to the UI manager is valid
     * when deserializing.
     * 
     * @param idv Main IDV reference!
     */
    @Override
    public void setIdv(IntegratedDataViewer idv) {
        super.setIdv(idv);
        uiManager = (UIManager)idv.getIdvUIManager();
    }

    /**
     * Set the name of this component holder to the contents of {@code value}.
     * 
     * <p>
     * Overridden so that McV can tell the ViewPanel to update upon a name
     * change.
     * </p>
     * 
     * @param value New name of this component holder.
     */
    @Override public void setName(String value) {
        super.setName(value);

        // let's hope that *getViewManagers* only gives us a list of 
        // ViewManagers
        @SuppressWarnings("unchecked")
        List<ViewManager> vms = getViewManagers();
        if (vms != null) {
            for (ViewManager vm : vms) {
                uiManager.getViewPanel().viewManagerChanged(vm);
            }
        }
    }

    /**
     * Build the UI component using the XML skin contained by this holder.
     * 
     * @return UI Component specified by the skin contained in this holder.
     */
    public JComponent makeDynamicSkin() {
        if (cached != null) {
            return cached;
        }
        try {
            Element root = XmlUtil.getRoot((String) getObject());

            IdvXmlUi ui = uiManager.doMakeIdvXmlUi(null, getViewManagers(),
                    root);

            // look for any "embedded" ViewManagers.
            Element startNode = XmlUtil.findElement(root, null, "embeddednode",
                    "true");
            if (startNode != null) {
                ui.setStartNode(startNode);
            }

            JComponent contents = (JComponent)ui.getContents();
            setViewManagers(ui.getViewManagers());

            cached = contents;
            return contents;
        } catch (Exception e) {
            throw new WrapperException(e);
        }
    }

    /**
     * Tell this component holder's component group that the tab corresponding
     * to this holder should become the active tab.
     */
    public void setAsActiveTab() {
        McvComponentGroup parent = (McvComponentGroup)getParent();
        if (parent != null) {
            parent.setActiveComponentHolder(this);
        }
    }
}