/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.internal.discovery.ui.editor;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IConfigurationElement;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.Platform;

import org.eclipse.jface.layout.GridDataFactory;

import org.eclipse.jface.layout.GridLayoutFactory;

import org.eclipse.jface.resource.ImageDescriptor;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.Font;

import org.eclipse.swt.graphics.GC;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.graphics.Resource;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Event;

import org.eclipse.swt.widgets.Listener;

import org.eclipse.ui.IEditorInput;

import org.eclipse.ui.IEditorSite;

import org.eclipse.ui.IPersistableElement;

import org.eclipse.ui.PartInitException;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.part.EditorPart;

import com.nokia.carbide.discovery.ui.Activator;

import com.nokia.carbide.discovery.ui.Messages;

import com.nokia.carbide.internal.discovery.ui.extension.IPortalPage;

import com.nokia.carbide.internal.discovery.ui.extension.IPortalPage.IActionBar;

import com.nokia.cpp.internal.api.utils.core.Pair;

import com.nokia.cpp.internal.api.utils.ui.WorkbenchUtils;

public class PortalEditor extends EditorPart {

	private static final String ID = "com.nokia.carbide.discovery.ui.portalEditor"; //$NON-NLS-1$

	private static final String CONTEXT_ID = ID + ".context"; //$NON-NLS-1$

	private static IEditorInput input;

	private List<IPortalPage> uninitializedPages;

	private Composite backgroundParent;

	private Image oldBGImg;

	private List<Resource> resources;

	private StackComposite stackComposite;

	private Map<IPortalPage, Control> pageToControlMap;

	private NavigationBar navigationBar;

	public PortalEditor() {

		resources = new ArrayList<Resource>();

		loadPortalPages();

		pageToControlMap = new HashMap<IPortalPage, Control>();

	}

	private void loadPortalPages() {

		List<Pair<IPortalPage, Integer>> pageExtensions = new ArrayList<Pair<IPortalPage,Integer>>();

		IConfigurationElement[] elements = 

			Platform.getExtensionRegistry().getConfigurationElementsFor(Activator.PLUGIN_ID + ".portalPage"); //$NON-NLS-1$

		for (IConfigurationElement element : elements) {

			try {

				IPortalPage portalPage = (IPortalPage) element.createExecutableExtension("class"); //$NON-NLS-1$

				String rankString = element.getAttribute("rank"); //$NON-NLS-1$

				int rank = Integer.MAX_VALUE;

				if (rankString != null) {

					try {

						rank = Integer.parseInt(rankString);

					}

					catch (NumberFormatException e) {

						Activator.logError(MessageFormat.format("Could not get rank for portal page {0}",

										portalPage.getClass().getName()), e);

					}

				}

				pageExtensions.add(new Pair<IPortalPage, Integer>(portalPage, rank));

			} 

			catch (CoreException e) {

				Activator.logError(Messages.PortalEditor_PageLoadError, e);

			}

		}

		Collections.sort(pageExtensions, new Comparator<Pair<IPortalPage, Integer>>() {

			@Override

			public int compare(Pair<IPortalPage, Integer> o1, Pair<IPortalPage, Integer> o2) {

				return o1.second.compareTo(o2.second);

			}

		});

		uninitializedPages = new ArrayList<IPortalPage>();

		for (Pair<IPortalPage, Integer> pair : pageExtensions) {

			uninitializedPages.add(pair.first);

		}

	}

	@Override

	public void doSave(IProgressMonitor monitor) {

	}

	@Override

	public void doSaveAs() {

	}

	@Override

	public boolean isDirty() {

		return false;

	}

	@Override

	public boolean isSaveAsAllowed() {

		return false;

	}

	@Override

	public void init(IEditorSite site, IEditorInput input) throws PartInitException {

		setSite(site);

		setInput(input);

	}

	@Override

	public void createPartControl(final Composite parent) {

		Composite body = createBody(parent);

		navigationBar.initUI();

		PlatformUI.getWorkbench().getHelpSystem().setHelp(body, CONTEXT_ID);

	}

	private Composite createBody(final Composite parent) {

		// create background

		backgroundParent = new Composite(parent, SWT.NONE);

		applyBG(backgroundParent);

		GridLayoutFactory.fillDefaults().applyTo(backgroundParent);

		// create top naviation bar

		navigationBar = createNavigationBar(backgroundParent);

		// create stack composite

		createStackComposite(backgroundParent, navigationBar);

		return backgroundParent;

	}

	private void createStackComposite(Composite parent, NavigationBar bar) {

		stackComposite = new StackComposite(parent, backgroundParent);

		for (IPortalPage page : uninitializedPages) {

			Control control = createPage(page);

			pageToControlMap.put(page, control);

		}

		GridDataFactory.fillDefaults().grab(true, true).applyTo(stackComposite);

	}

	private Control createPage(IPortalPage page) {

		Composite pageComposite = new SharedBackgroundComposite(stackComposite, backgroundParent);

		GridLayoutFactory.fillDefaults().numColumns(2).spacing(20, 0).extendedMargins(20, 20, 20, 0).applyTo(pageComposite);

		ActionUIUpdater updater = new ActionUIUpdater();

		IActionBar[] commandBars = page.createCommandBars(this, updater);

		if (commandBars.length > 0) {

			Composite taskComposite = new SharedBackgroundComposite(pageComposite, backgroundParent);

			GridLayoutFactory.fillDefaults().applyTo(taskComposite);

			GridDataFactory.fillDefaults().grab(false, true).applyTo(taskComposite);

			for (IActionBar actionBar : commandBars) {

				Control control = createTaskBarControl(taskComposite, actionBar, updater);

				GridDataFactory.fillDefaults().indent(0, 0).applyTo(control);

			}

		}

		Composite pageControl = new RoundedCornerComposite(pageComposite, backgroundParent, 

				null, pageComposite.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));

		GridLayoutFactory.fillDefaults().margins(2, 2).applyTo(pageControl);

		GridDataFactory.fillDefaults().grab(true, true).applyTo(pageControl);

		Control control = page.createControl(pageControl, this);

		GridDataFactory.fillDefaults().grab(true, true).applyTo(control);

		return pageComposite;

	}

	private Control createTaskBarControl(Composite clientArea, IActionBar actionBar, ActionUIUpdater updater) {

		TaskBar taskBar = new TaskBar(clientArea, this, actionBar);

		updater.addTaskBar(taskBar);

		return taskBar;

	}

	private NavigationBar createNavigationBar(Composite parent) {

		NavigationBar bar = new NavigationBar(this, parent);

		for (IPortalPage page : uninitializedPages) {

			bar.addNavButton(bar, page);

		}

		return bar;

	}

	void showPage(IPortalPage page) {

		if (uninitializedPages.contains(page)) {

			uninitializedPages.remove(page);

			page.init();

		}

		stackComposite.showControl(pageToControlMap.get(page));

	}

	private void applyBG(final Composite composite) {

		composite.addListener(SWT.Resize, new Listener() {

			@Override

			public void handleEvent(Event event) {

				Rectangle rect = composite.getClientArea();

				Image newImage = new Image(composite.getDisplay(), rect.width, rect.height);

				GC gc = new GC(newImage);

				gc.setForeground(composite.getDisplay().getSystemColor(SWT.COLOR_BLACK));

				gc.fillGradientRectangle(0, 0, rect.width, rect.height, true);

				gc.dispose();

				composite.setBackgroundImage(newImage);

				if (oldBGImg != null)

					oldBGImg.dispose();

				oldBGImg = newImage;

			}

		});

	}

	@Override

	public void setFocus() {

	}

	public static void openPortal() {

		try {

			WorkbenchUtils.openEditor(getInput(), ID);

		} catch (PartInitException e) {

			Activator.logError(Messages.PortalEditor_PageOpenError, e);

		}

	}

	private static IEditorInput getInput() {

		if (input == null) {

			input = new IEditorInput() {

				@SuppressWarnings("rawtypes")

				@Override

				public Object getAdapter(Class adapter) {

					return null;

				}

				@Override

				public String getToolTipText() {

					return getName();

				}

				@Override

				public IPersistableElement getPersistable() {

					return null;

				}

				@Override

				public String getName() {

					return Messages.PortalEditor_Name;

				}

				@Override

				public ImageDescriptor getImageDescriptor() {

					return null;

				}

				@Override

				public boolean exists() {

					return false;

				}

			};

		}

		return input;

	}

		resources.add(image);

		return image;

	}

		resources.add(font);

		return font;

	}

	@Override

	public void dispose() {

		super.dispose();

		for (Resource resource : resources) {

			resource.dispose();

		}

		if (oldBGImg != null)

			oldBGImg.dispose();

	}

	public Composite getBackgroundParent() {

		return backgroundParent;

	}

}