/*******************************************************************************
 * Copyright (c) 2009, 2011 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.hyperlink;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.hyperlink.IHyperlink;
import org.eclipse.jface.text.hyperlink.URLHyperlink;
import org.eclipse.osgi.util.NLS;
import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IPersistableElement;
import org.eclipse.ui.IStorageEditorInput;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.eclipse.wst.sse.core.internal.util.JarUtilities;
import org.eclipse.wst.xml.core.internal.Logger;
import org.eclipse.wst.xml.ui.internal.XMLUIMessages;
import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;

/**
 * Hyperlink for URLs (opens in read-only mode)
 */
class URLStorageHyperlink implements IHyperlink {
	// copies of this class exist in:
	// org.eclipse.wst.xml.ui.internal.hyperlink
	// org.eclipse.wst.html.ui.internal.hyperlink
	// org.eclipse.jst.jsp.ui.internal.hyperlink

	static class StorageEditorInput implements IStorageEditorInput {
		IStorage fStorage = null;

		StorageEditorInput(IStorage storage) {
			fStorage = storage;
		}

		public IStorage getStorage() throws CoreException {
			return fStorage;
		}

		public boolean exists() {
			return fStorage != null;
		}

		public boolean equals(Object obj) {
			if (obj instanceof StorageEditorInput) {
				return fStorage.equals(((StorageEditorInput) obj).fStorage);
			}
			return super.equals(obj);
		}

		public ImageDescriptor getImageDescriptor() {
			return null;
		}

		public String getName() {
			return fStorage.getName();
		}

		public IPersistableElement getPersistable() {
			return null;
		}

		public String getToolTipText() {
			return fStorage.getFullPath() != null ? fStorage.getFullPath().toString() : fStorage.getName();
		}

		public Object getAdapter(Class adapter) {
			return null;
		}
	}

	static class URLStorage implements IStorage {
		URL fURL = null;

		URLStorage(URL url) {
			fURL = url;
		}

		public boolean equals(Object obj) {
			if (obj instanceof URLStorage) {
				return fURL.equals(((URLStorage) obj).fURL);
			}
			return super.equals(obj);
		}

		public InputStream getContents() throws CoreException {
			InputStream stream = null;
			try {
				if (fURL.toString().startsWith("jar:file"))
					stream = JarUtilities.getInputStream(fURL);
				else
					stream = fURL.openStream();
			}
			catch (Exception e) {
				throw new CoreException(new Status(IStatus.ERROR, XMLUIPlugin.getDefault().getBundle().getSymbolicName(), IStatus.ERROR, fURL.toString(), e));
			}
			return stream;
		}

		public IPath getFullPath() {
			return new Path(fURL.toString());
		}

		public String getName() {
			return new Path(fURL.getFile()).lastSegment();
		}

		public boolean isReadOnly() {
			return true;
		}

		public Object getAdapter(Class adapter) {
			return null;
		}

	}

	private IRegion fRegion;
	private URL fURL;

	public URLStorageHyperlink(IRegion region, URL url) {
		fRegion = region;
		fURL = url;
	}

	public IRegion getHyperlinkRegion() {
		return fRegion;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.text.hyperlink.IHyperlink#getTypeLabel()
	 */
	public String getTypeLabel() {
		return null;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.text.hyperlink.IHyperlink#getHyperlinkText()
	 */
	public String getHyperlinkText() {
		String path = fURL.toString();
		if (path.length() > 60) {
			path = path.substring(0, 25) + "..." + path.substring(path.length() - 25, path.length());
		}
		final String editorLabel = getEditorLabel();
		if (editorLabel != null)
			return NLS.bind(XMLUIMessages.Open_With, path, editorLabel);
		return NLS.bind(XMLUIMessages.Open, path);
	}

	protected String getEditorLabel() {
		IEditorDescriptor descriptor = getEditorDescriptor();
		return descriptor != null ? descriptor.getLabel() : null;
	}

	private IEditorDescriptor getEditorDescriptor() {
		final URLStorage storage = new URLStorage(fURL);
		final String path = fURL.getPath();
		String name = null;
		if (path != null)
			name = new Path(fURL.getPath()).lastSegment();

		IContentType contentType= null;
		try {
			InputStream is = null;
			try {
				is = storage.getContents();
				contentType= Platform.getContentTypeManager().findContentTypeFor(is, name);
			} finally {
				if (is != null) {
					is.close();
				}
			}
		} catch (CoreException ex) {
			// continue without content type
		} catch (IOException ex) {
			// continue without content type
		}

		return PlatformUI.getWorkbench().getEditorRegistry().getDefaultEditor(name, contentType);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.text.hyperlink.IHyperlink#open()
	 */
	public void open() {
		if (fURL != null) {
			IEditorInput input = new StorageEditorInput(new URLStorage(fURL));
			try {
				final IEditorDescriptor descriptor = getEditorDescriptor();
				if (descriptor != null) {
					IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
					IDE.openEditor(page, input, descriptor.getId(), true);
				}
			}
			catch (PartInitException e) {
				Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
				new URLHyperlink(fRegion, fURL.toString()).open();
			}
		}
	}
}