/*******************************************************************************
 * Copyright (c) 2009 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:
 *    Ian Trimble - initial API and implementation
 *******************************************************************************/ 
package org.eclipse.jst.pagedesigner.editors.actions;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jst.jsf.common.metadata.Model;
import org.eclipse.jst.jsf.common.metadata.Trait;
import org.eclipse.jst.jsf.common.metadata.internal.TraitValueHelper;
import org.eclipse.jst.jsf.common.metadata.query.ITaglibDomainMetaDataModelContext;
import org.eclipse.jst.jsf.common.metadata.query.TaglibDomainMetaDataQueryHelper;
import org.eclipse.jst.pagedesigner.dtresourceprovider.DTResourceProviderFactory;
import org.eclipse.jst.pagedesigner.dtresourceprovider.DTSkinManager;
import org.eclipse.jst.pagedesigner.dtresourceprovider.IDTResourceProvider;
import org.eclipse.jst.pagedesigner.dtresourceprovider.IDTSkin;
import org.eclipse.jst.pagedesigner.utils.EditorUtil;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.ui.IWorkbenchActionConstants;

/**
 * Builds menu items for managing skins.
 * 
 * @author Ian Trimble - Oracle
 */
public class SkinsMenuItemBuilder {

	private static final String DATAKEY_DTSKIN = "DATAKEY_DTSKIN"; //$NON-NLS-1$
	private static final String DATAKEY_NSURI = "DTATKEY_NSURI"; //$NON-NLS-1$

	private static List<Menu> menuList = new ArrayList<Menu>();

	private IProject project;

	/**
	 * Constructs an instance.
	 * 
	 * @param project IProject instance for which to get skin information.
	 */
	public SkinsMenuItemBuilder(IProject project) {
		this.project = project;
	}

	/**
	 * Builds menu items (adds a separator and then menu items to end of
	 * specified menu.
	 * 
	 * @param menu Menu instance to which to add menu items.
	 */
	public void buildMenuItems(Menu menu) {
		for (Menu oldMenu: menuList) {
			oldMenu.dispose();
		}
		if (menu != null) {
			List<TaglibData> taglibDataList = getTaglibDataList();
			if (taglibDataList.size() > 0) {
				new MenuItem(menu, SWT.SEPARATOR);
			}
			for (TaglibData taglibData: taglibDataList) {
				String nsURI = taglibData.getNSURI();
				DTSkinManager dtSkinManager = DTSkinManager.getInstance(project);
				IDTSkin currentDTSkin = dtSkinManager.getCurrentSkin(nsURI);
				MenuItem menuItem = new MenuItem(menu, SWT.CASCADE);
				menuItem.setText(taglibData.getName());
				Menu skinMenu = new Menu(menuItem);
				menuList.add(skinMenu);
				menuItem.setMenu(skinMenu);
				List<IDTSkin> dtSkins = dtSkinManager.getSkins(nsURI);
				for (IDTSkin dtSkin: dtSkins) {
					MenuItem skinMenuItem;
					if (currentDTSkin == dtSkin) {
						skinMenuItem = new MenuItem(skinMenu, SWT.CHECK);
						skinMenuItem.setSelection(true);
					} else {
						skinMenuItem = new MenuItem(skinMenu, SWT.PUSH);
					}
					skinMenuItem.setText(dtSkin.getName());
					skinMenuItem.setData(DATAKEY_DTSKIN, dtSkin);
					skinMenuItem.setData(DATAKEY_NSURI, nsURI);
					skinMenuItem.addSelectionListener(new SkinSelectionListener());
				}
			}
		}
	}

	/**
	 * Builds menu managers.
	 * 
	 * @param parent Parent menu manager to which to append new menu managers.
	 */
	public void buildMenuManagers(IMenuManager parent) {
		List<TaglibData> taglibDataList = getTaglibDataList();
		if (taglibDataList.size() > 0) {
			parent.appendToGroup(IWorkbenchActionConstants.MB_ADDITIONS, new Separator());
		}
		for (TaglibData taglibData: taglibDataList) {
			String nsURI = taglibData.getNSURI();
			MenuManager newMgr = new MenuManager(taglibData.getName());
			DTSkinManager dtSkinManager = DTSkinManager.getInstance(project);
			IDTSkin currentDTSkin = dtSkinManager.getCurrentSkin(nsURI);
			List<IDTSkin> dtSkins = dtSkinManager.getSkins(nsURI);
			for (IDTSkin dtSkin: dtSkins) {
				newMgr.add(new ChangeCurrentSkinAction(nsURI, dtSkin, dtSkin == currentDTSkin));
			}
			parent.appendToGroup(IWorkbenchActionConstants.MB_ADDITIONS, newMgr);
		}
	}

	private List<TaglibData> getTaglibDataList() {
		List<TaglibData> taglibDataList = new ArrayList<TaglibData>();
		List<IDTResourceProvider> dtResourceProviders =
			DTResourceProviderFactory.getInstance().getActiveDTResourceProviders(project);
		for (IDTResourceProvider dtResourceProvider: dtResourceProviders) {
			TaglibData taglibData = new TaglibData(dtResourceProvider.getId());
			if (!taglibDataList.contains(taglibData)) {
				taglibDataList.add(taglibData);
			}
		}
		return taglibDataList;
	}


	/**
	 * Used to hold and pass taglib-related data.
	 */
	private class TaglibData {
		private String nsURI;
		private String name;
		public TaglibData(String nsURI) {
			this.nsURI = nsURI;
			ITaglibDomainMetaDataModelContext modelContext = TaglibDomainMetaDataQueryHelper.createMetaDataModelContext(project, nsURI);
			Model model = TaglibDomainMetaDataQueryHelper.getModel(modelContext);
			Trait trait = TaglibDomainMetaDataQueryHelper.getTrait(model, "display-label"); //$NON-NLS-1$
			this.name = TraitValueHelper.getValueAsString(trait);
		}
		public String getNSURI() {
			return nsURI;
		}
		public String getName() {
			return name;
		}
		/*
		 * (non-Javadoc)
		 * @see java.lang.Object#hashCode()
		 */
		public int hashCode() {
			int nsURIHashCode = 0;
			if (nsURI != null) {
				nsURIHashCode = nsURI.hashCode();
			}
			int nameHashCode = 0;
			if (name != null) {
				nameHashCode = name.hashCode();
			}
			return nameHashCode | nsURIHashCode ;
		}
	}


	/**
	 * Selection listener for skin menu items.
	 */
	private class SkinSelectionListener implements SelectionListener {
		/*
		 * (non-Javadoc)
		 * @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
		 */
		public void widgetSelected(SelectionEvent event) {
			String nsURI = (String)event.widget.getData(DATAKEY_NSURI);
			IDTSkin dtSkin = (IDTSkin)event.widget.getData(DATAKEY_DTSKIN);
			DTSkinManager.getInstance(project).setCurrentSkin(nsURI, dtSkin);
			EditorUtil.refreshAllWPEDesignViewers();
		}
		/*
		 * (non-Javadoc)
		 * @see org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(org.eclipse.swt.events.SelectionEvent)
		 */
		public void widgetDefaultSelected(SelectionEvent event) {
			widgetSelected(event);
		}
	}


	/**
	 * Action for changing current skin.
	 */
	private class ChangeCurrentSkinAction extends Action {
		private String nsURI;
		private IDTSkin dtSkin;
		/**
		 * Creates an instance.
		 * 
		 * @param nsURI NSURI of taglib.
		 * @param dtSkin IDTSkin instance.
		 * @param checked true if IDTSkin instance is current for nsURI.
		 */
		public ChangeCurrentSkinAction(String nsURI, IDTSkin dtSkin, boolean checked) {
			super(dtSkin.getName());
			this.nsURI = nsURI;
			this.dtSkin = dtSkin;
			setChecked(checked);
		}
		/*
		 * (non-Javadoc)
		 * @see org.eclipse.jface.action.Action#run()
		 */
		public void run() {
			DTSkinManager.getInstance(project).setCurrentSkin(nsURI, dtSkin);
			EditorUtil.refreshAllWPEDesignViewers();
		}
	}

}