/*******************************************************************************
 * Copyright (c) 2000, 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
 *******************************************************************************/
package org.eclipse.jdt.internal.ui.jarpackager;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;

import org.eclipse.jface.util.Assert;

import org.eclipse.ltk.core.refactoring.RefactoringCore;
import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;
import org.eclipse.ltk.core.refactoring.RefactoringDescriptorProxy;
import org.eclipse.ltk.core.refactoring.history.IRefactoringHistoryService;

import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IPackageFragment;

import org.eclipse.jdt.ui.jarpackager.IJarDescriptionWriter;
import org.eclipse.jdt.ui.jarpackager.JarPackageData;

import org.eclipse.jdt.internal.ui.IJavaStatusConstants;
import org.eclipse.jdt.internal.ui.JavaPlugin;

import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * Writes a JarPackage to an underlying OutputStream
 */
public class JarPackageWriter extends Object implements IJarDescriptionWriter {
	
	protected OutputStream fOutputStream;
	
	/**
	 * Create a JarPackageWriter on the given output stream.
	 * It is the clients responsibility to close the output stream.
	 */
	public JarPackageWriter(OutputStream outputStream) {
		Assert.isNotNull(outputStream);
		fOutputStream= new BufferedOutputStream(outputStream);
	}
	
	public void write(JarPackageData jarPackage) throws CoreException {
		try  {
			writeXML(jarPackage);
		} catch (IOException ex) {
			String message= (ex.getLocalizedMessage() != null ? ex.getLocalizedMessage() : ""); //$NON-NLS-1$
			throw new CoreException(new Status(IStatus.ERROR, JavaPlugin.getPluginId(), IJavaStatusConstants.INTERNAL_ERROR, message, ex));
		}
	}

	/**
	 * Writes a XML representation of the JAR specification
	 * to to the underlying stream.
	 * 
	 * @exception IOException	if writing to the underlying stream fails
	 */
	public void writeXML(JarPackageData jarPackage) throws IOException {
		Assert.isNotNull(jarPackage);
		DocumentBuilder docBuilder= null;
		DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
		factory.setValidating(false);
		try {   	
	    	docBuilder= factory.newDocumentBuilder();
		} catch (ParserConfigurationException ex) {
			throw new IOException(JarPackagerMessages.JarWriter_error_couldNotGetXmlBuilder); 
		}
		Document document= docBuilder.newDocument();
		
		// Create the document
		Element xmlJarDesc= document.createElement(JarPackagerUtil.DESCRIPTION_EXTENSION);
		document.appendChild(xmlJarDesc);
		xmlWriteJarLocation(jarPackage, document, xmlJarDesc);
		xmlWriteOptions(jarPackage, document, xmlJarDesc);
		xmlWriteRefactoring(jarPackage, document, xmlJarDesc);
		xmlWriteSelectedProjects(jarPackage, document, xmlJarDesc);
		if (jarPackage.areGeneratedFilesExported())
			xmlWriteManifest(jarPackage, document, xmlJarDesc);
		xmlWriteSelectedElements(jarPackage, document, xmlJarDesc);

		try {
			// Write the document to the stream
			Transformer transformer=TransformerFactory.newInstance().newTransformer();
			transformer.setOutputProperty(OutputKeys.METHOD, "xml"); //$NON-NLS-1$
			transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); //$NON-NLS-1$
			transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //$NON-NLS-1$
			transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount","4"); //$NON-NLS-1$ //$NON-NLS-2$
			DOMSource source = new DOMSource(document);
			StreamResult result = new StreamResult(fOutputStream);
			transformer.transform(source, result);
		} catch (TransformerException e) {
			throw new IOException(JarPackagerMessages.JarWriter_error_couldNotTransformToXML); 
		}
	}

	private void xmlWriteJarLocation(JarPackageData jarPackage, Document document, Element xmlJarDesc) throws DOMException {
		Element jar= document.createElement(JarPackagerUtil.JAR_EXTENSION);
		xmlJarDesc.appendChild(jar);
		jar.setAttribute("path", jarPackage.getJarLocation().toPortableString()); //$NON-NLS-1$
	}

	private void xmlWriteOptions(JarPackageData jarPackage, Document document, Element xmlJarDesc) throws DOMException {
		Element options= document.createElement("options"); //$NON-NLS-1$
		xmlJarDesc.appendChild(options);
		options.setAttribute("overwrite", "" + jarPackage.allowOverwrite()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("compress", "" + jarPackage.isCompressed()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("exportErrors", "" + jarPackage.areErrorsExported()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("exportWarnings", "" + jarPackage.exportWarnings()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("saveDescription", "" + jarPackage.isDescriptionSaved()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("descriptionLocation", jarPackage.getDescriptionLocation().toPortableString()); //$NON-NLS-1$
		options.setAttribute("useSourceFolders", "" + jarPackage.useSourceFolderHierarchy()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("buildIfNeeded", "" + jarPackage.isBuildingIfNeeded()); //$NON-NLS-2$ //$NON-NLS-1$
		options.setAttribute("includeDirectoryEntries", "" + jarPackage.areDirectoryEntriesIncluded());  //$NON-NLS-1$//$NON-NLS-2$
		options.setAttribute("storeRefactorings", "" + jarPackage.isRefactoringAware());  //$NON-NLS-1$//$NON-NLS-2$
	}

	private void xmlWriteRefactoring(JarPackageData jarPackage, Document document, Element xmlJarDesc) throws DOMException {
		Element refactoring= document.createElement("storedRefactorings"); //$NON-NLS-1$
		xmlJarDesc.appendChild(refactoring);
		refactoring.setAttribute("structuralOnly", "" + jarPackage.isExportStructuralOnly()); //$NON-NLS-1$ //$NON-NLS-2$
		refactoring.setAttribute("deprecationInfo", "" + jarPackage.isDeprecationAware()); //$NON-NLS-1$ //$NON-NLS-2$
		final IProject[] projects= jarPackage.getRefactoringProjects();
		if (projects != null && projects.length > 0) {
			for (int index= 0; index < projects.length; index++)
				refactoring.setAttribute("project" + (index + 1), projects[index].getName()); //$NON-NLS-1$
		}
		final RefactoringDescriptorProxy[] proxies= jarPackage.getRefactoringDescriptors();
		if (proxies != null && proxies.length > 0) {
			int count= 1;
			IRefactoringHistoryService service= RefactoringCore.getHistoryService();
			try {
				service.connect();
				for (int index= 0; index < proxies.length; index++, count++) {
					try {
						final ByteArrayOutputStream stream= new ByteArrayOutputStream();
						service.writeRefactoringDescriptors(new RefactoringDescriptorProxy[] { proxies[index]}, stream, RefactoringDescriptor.NONE, true, null);
						refactoring.setAttribute("refactoring" + count, stream.toString("UTF-8")); //$NON-NLS-1$ //$NON-NLS-2$
					} catch (CoreException exception) {
						JavaPlugin.log(exception);
					} catch (UnsupportedEncodingException exception) {
						Assert.isTrue(false);
					}
				}
			} finally {
				service.disconnect();
			}
		}
	}

	private void xmlWriteManifest(JarPackageData jarPackage, Document document, Element xmlJarDesc) throws DOMException {
		Element manifest= document.createElement("manifest"); //$NON-NLS-1$
		xmlJarDesc.appendChild(manifest);
		manifest.setAttribute("manifestVersion", jarPackage.getManifestVersion()); //$NON-NLS-1$
		manifest.setAttribute("usesManifest", "" + jarPackage.usesManifest()); //$NON-NLS-2$ //$NON-NLS-1$
		manifest.setAttribute("reuseManifest", "" + jarPackage.isManifestReused()); //$NON-NLS-2$ //$NON-NLS-1$
		manifest.setAttribute("saveManifest", "" + jarPackage.isManifestSaved()); //$NON-NLS-2$ //$NON-NLS-1$
		manifest.setAttribute("generateManifest", "" + jarPackage.isManifestGenerated()); //$NON-NLS-2$ //$NON-NLS-1$
		manifest.setAttribute("manifestLocation", jarPackage.getManifestLocation().toPortableString()); //$NON-NLS-1$
		if (jarPackage.getManifestMainClass() != null)
			manifest.setAttribute("mainClassHandleIdentifier", jarPackage.getManifestMainClass().getHandleIdentifier()); //$NON-NLS-1$
		xmlWriteSealingInfo(jarPackage, document, manifest);
	}

	private void xmlWriteSealingInfo(JarPackageData jarPackage, Document document, Element manifest) throws DOMException {
		Element sealing= document.createElement("sealing"); //$NON-NLS-1$
		manifest.appendChild(sealing);
		sealing.setAttribute("sealJar", "" + jarPackage.isJarSealed()); //$NON-NLS-2$ //$NON-NLS-1$
		Element packagesToSeal= document.createElement("packagesToSeal"); //$NON-NLS-1$
		sealing.appendChild(packagesToSeal);
		add(jarPackage.getPackagesToSeal(), packagesToSeal, document);
		Element packagesToUnSeal= document.createElement("packagesToUnSeal"); //$NON-NLS-1$
		sealing.appendChild(packagesToUnSeal);
		add(jarPackage.getPackagesToUnseal(), packagesToUnSeal, document);
	}

	private void xmlWriteSelectedElements(JarPackageData jarPackage, Document document, Element xmlJarDesc) throws DOMException {
		Element selectedElements= document.createElement("selectedElements"); //$NON-NLS-1$
		xmlJarDesc.appendChild(selectedElements);
		selectedElements.setAttribute("exportClassFiles", "" + jarPackage.areClassFilesExported()); //$NON-NLS-2$ //$NON-NLS-1$
		selectedElements.setAttribute("exportOutputFolder", "" + jarPackage.areOutputFoldersExported()); //$NON-NLS-2$ //$NON-NLS-1$
		selectedElements.setAttribute("exportJavaFiles", "" + jarPackage.areJavaFilesExported()); //$NON-NLS-2$ //$NON-NLS-1$
		Object[] elements= jarPackage.getElements();
		for (int i= 0; i < elements.length; i++) {
			Object element= elements[i];
			if (element instanceof IResource)
				add((IResource)element, selectedElements, document);
			else if (element instanceof IJavaElement)
				add((IJavaElement)element, selectedElements, document);
			// Note: Other file types are not handled by this writer
		}
	}

	private void xmlWriteSelectedProjects(JarPackageData jarPackage, Document document, Element xmlJarDesc) throws DOMException {
		Element selectedElements= document.createElement("selectedProjects"); //$NON-NLS-1$
		xmlJarDesc.appendChild(selectedElements);
		Object[] elements= jarPackage.getRefactoringProjects();
		for (int index= 0; index < elements.length; index++) {
			Object element= elements[index];
			if (element instanceof IResource)
				add((IResource)element, selectedElements, document);
		}
	}
	
	/**
     * Closes this stream.
     * It is the client's responsibility to close the stream.
     * 
     * @throws CoreException
     */
    public void close() throws CoreException {
    	if (fOutputStream != null) {
			try {
				fOutputStream.close();
			} catch (IOException ex) {
				String message= (ex.getLocalizedMessage() != null ? ex.getLocalizedMessage() : ""); //$NON-NLS-1$
				throw new CoreException(new Status(IStatus.ERROR, JavaPlugin.getPluginId(), IJavaStatusConstants.INTERNAL_ERROR, message, ex));
			}
    	}
	}

	private void add(IResource resource, Element parent, Document document) {
		if (resource.getType() == IResource.PROJECT) {
			Element element= document.createElement("project"); //$NON-NLS-1$
			parent.appendChild(element);
			element.setAttribute("name", resource.getName()); //$NON-NLS-1$
		} else if (resource.getType() == IResource.FILE) {
			Element element= document.createElement("file"); //$NON-NLS-1$
			parent.appendChild(element);
			element.setAttribute("path", resource.getFullPath().toString()); //$NON-NLS-1$
		} else if (resource.getType() == IResource.FOLDER) {
			Element element= document.createElement("folder"); //$NON-NLS-1$
			parent.appendChild(element);
			element.setAttribute("path", resource.getFullPath().toString()); //$NON-NLS-1$
		}
	}
	
	private void add(IJavaElement javaElement, Element parent, Document document) {
		Element element= document.createElement("javaElement"); //$NON-NLS-1$
		parent.appendChild(element);
		element.setAttribute("handleIdentifier", javaElement.getHandleIdentifier()); //$NON-NLS-1$
	}

	private void add(IPackageFragment[] packages, Element parent, Document document) {
		for (int i= 0; i < packages.length; i++) {
			Element pkg= document.createElement("package"); //$NON-NLS-1$
			parent.appendChild(pkg);
			pkg.setAttribute("handleIdentifier", packages[i].getHandleIdentifier()); //$NON-NLS-1$
		}
	}

	/*
	 * This writer always returns OK
	 */
	public IStatus getStatus() {
		return new Status(IStatus.OK, JavaPlugin.getPluginId(), 0, "", null); //$NON-NLS-1$
	}
}