/*******************************************************************************
 * Copyright (c) 2005, 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.File;
import java.io.IOException;
import java.io.InputStream;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.hyperlink.IHyperlink;
import org.eclipse.osgi.util.NLS;
import org.eclipse.ui.IEditorDescriptor;
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.xml.ui.internal.Logger;
import org.eclipse.wst.xml.ui.internal.XMLUIMessages;

/**
 * Hyperlink for external files.
 */
class ExternalFileHyperlink 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

	private IRegion fHyperlinkRegion;
	private File fHyperlinkFile;

	public ExternalFileHyperlink(IRegion region, File file) {
		fHyperlinkFile = file;
		fHyperlinkRegion = region;
	}

	public IRegion getHyperlinkRegion() {
		return fHyperlinkRegion;
	}

	public String getTypeLabel() {
		return null;
	}

	public String getHyperlinkText() {
		String path = fHyperlinkFile.getPath();
		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);
	}

	private String getEditorLabel() {
		final IFileStore store = EFS.getLocalFileSystem().getStore(fHyperlinkFile.toURI());
		final String name = store.fetchInfo().getName();

		if (name == null) {
			return null;
		}

		IContentType contentType= null;
		try {
			InputStream is = null;
			try {
				is = store.openInputStream(EFS.NONE, null);
				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
		}

		final IEditorDescriptor descriptor = PlatformUI.getWorkbench().getEditorRegistry().getDefaultEditor(name, contentType);
		return descriptor != null ? descriptor.getLabel() : null;
	}

	public void open() {
		if (fHyperlinkFile != null) {
			try {
				IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
				IFileStore store = EFS.getLocalFileSystem().getStore(fHyperlinkFile.toURI());
				IDE.openEditorOnFileStore(page, store) ;
			}
			catch (PartInitException e) {
				Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
			}
		}
	}
}