/*******************************************************************************
 * Copyright (c) 2002, 2006 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.wizards;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.util.zip.ZipFile;

import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.ui.dialogs.IOverwriteQuery;
import org.eclipse.ui.wizards.datatransfer.ImportOperation;
import org.eclipse.ui.wizards.datatransfer.ZipFileStructureProvider;
import org.eclipse.wst.xml.ui.internal.Logger;
import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;
import org.osgi.framework.Bundle;

public class ExampleProjectCreationOperation implements IRunnableWithProgress {

	private IResource elementToOpen;

	private IOverwriteQuery overwriteQuery;

	private ExampleProjectCreationWizardPage[] pages;

	/**
	 * Constructor for ExampleProjectCreationOperation
	 */
	public ExampleProjectCreationOperation(ExampleProjectCreationWizardPage[] myPages, IOverwriteQuery myOverwriteQuery) {
		elementToOpen = null;
		pages = myPages;
		overwriteQuery = myOverwriteQuery;
	}

	private IProject configNewProject(IWorkspaceRoot root, String name, String[] natureIds, IProject[] referencedProjects, IProgressMonitor monitor) throws InvocationTargetException {
		try {
			IProject project = root.getProject(name);
			if (!project.exists()) {
				project.create(null);
			}
			if (!project.isOpen()) {
				project.open(null);
			}
			IProjectDescription desc = project.getDescription();
			desc.setLocation(null);
			desc.setNatureIds(natureIds);
			desc.setReferencedProjects(referencedProjects);

			project.setDescription(desc, new SubProgressMonitor(monitor, 1));

			return project;
		}
		catch (CoreException e) {
			throw new InvocationTargetException(e);
		}
	}

	private void createProject(IWorkspaceRoot root, ExampleProjectCreationWizardPage page, IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
		IConfigurationElement desc = page.getConfigurationElement();

		IConfigurationElement[] imports = desc.getChildren("import"); //$NON-NLS-1$
		IConfigurationElement[] natures = desc.getChildren("nature"); //$NON-NLS-1$
		IConfigurationElement[] references = desc.getChildren("references"); //$NON-NLS-1$
		int nImports = (imports == null) ? 0 : imports.length;
		int nNatures = (natures == null) ? 0 : natures.length;
		int nReferences = (references == null) ? 0 : references.length;

		monitor.beginTask(XMLWizardsMessages.ExampleProjectCreationOperation_op_desc_proj, nImports + 1);

		String name = page.getProjectName();

		String[] natureIds = new String[nNatures];
		for (int i = 0; i < nNatures; i++) {
			natureIds[i] = natures[i].getAttribute("id"); //$NON-NLS-1$
		}
		IProject[] referencedProjects = new IProject[nReferences];
		for (int i = 0; i < nReferences; i++) {
			referencedProjects[i] = root.getProject(references[i].getAttribute("id")); //$NON-NLS-1$
		}

		IProject proj = configNewProject(root, name, natureIds, referencedProjects, monitor);

		for (int i = 0; i < nImports; i++) {
			doImports(proj, imports[i], new SubProgressMonitor(monitor, 1));
		}

		String open = desc.getAttribute("open"); //$NON-NLS-1$
		if ((open != null) && (open.length() > 0)) {
			IResource fileToOpen = proj.findMember(new Path(open));
			if (fileToOpen != null) {
				elementToOpen = fileToOpen;
			}
		}

	}

	private void doImports(IProject project, IConfigurationElement curr, IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
		try {
			IPath destPath;
			String name = curr.getAttribute("dest"); //$NON-NLS-1$
			if ((name == null) || (name.length() == 0)) {
				destPath = project.getFullPath();
			}
			else {
				IFolder folder = project.getFolder(name);
				if (!folder.exists()) {
					folder.create(true, true, null);
				}
				destPath = folder.getFullPath();
			}
			String importPath = curr.getAttribute("src"); //$NON-NLS-1$
			if (importPath == null) {
				importPath = ""; //$NON-NLS-1$
				Logger.log(Logger.ERROR, "projectsetup descriptor: import missing"); //$NON-NLS-1$
				return;
			}

			ZipFile zipFile = getZipFileFromPluginDir(importPath, getContributingPlugin(curr));
			importFilesFromZip(zipFile, destPath, new SubProgressMonitor(monitor, 1));
		}
		catch (CoreException e) {
			throw new InvocationTargetException(e);
		}
	}

	private String getContributingPlugin(IConfigurationElement configurationElement) {
		Object parent = configurationElement;
		while (parent != null) {
			if (parent instanceof IExtension) {
				return ((IExtension) parent).getNamespace();
			}
			parent = ((IConfigurationElement) parent).getParent();
		}
		return null;
	}

	public IResource getElementToOpen() {
		return elementToOpen;
	}

	private ZipFile getZipFileFromPluginDir(String pluginRelativePath, String symbolicName) throws CoreException {
		try {
			Bundle bundle = Platform.getBundle(symbolicName);
			URL starterURL = new URL(bundle.getEntry("/"), pluginRelativePath); //$NON-NLS-1$
			return new ZipFile(Platform.asLocalURL(starterURL).getFile());
		}
		catch (IOException e) {
			String message = pluginRelativePath + ": " + e.getMessage(); //$NON-NLS-1$
			Status status = new Status(IStatus.ERROR, XMLUIPlugin.ID, IStatus.ERROR, message, e);
			throw new CoreException(status);
		}
	}

	private void importFilesFromZip(ZipFile srcZipFile, IPath destPath, IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
		ZipFileStructureProvider structureProvider = new ZipFileStructureProvider(srcZipFile);
		ImportOperation op = new ImportOperation(destPath, structureProvider.getRoot(), structureProvider, overwriteQuery);
		op.run(monitor);
	}

	/*
	 * @see IRunnableWithProgress#run(IProgressMonitor)
	 */
	public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
		if (monitor == null) {
			monitor = new NullProgressMonitor();
		}
		try {
			monitor.beginTask(XMLWizardsMessages.ExampleProjectCreationOperation_op_desc, pages.length);
			IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();

			for (int i = 0; i < pages.length; i++) {
				createProject(root, pages[i], new SubProgressMonitor(monitor, 1));
			}
		}
		finally {
			monitor.done();
		}
	}
}