/*******************************************************************************
 * Copyright (c) 2000, 2005 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.debug.testplugin;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.zip.ZipFile;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
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.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.core.ClasspathEntry;
import org.eclipse.ui.dialogs.IOverwriteQuery;
import org.eclipse.ui.wizards.datatransfer.FileSystemStructureProvider;
import org.eclipse.ui.wizards.datatransfer.IImportStructureProvider;
import org.eclipse.ui.wizards.datatransfer.ImportOperation;
import org.eclipse.ui.wizards.datatransfer.ZipFileStructureProvider;

/**
 * Helper methods to set up a IJavaProject.
 */
public class JavaProjectHelper {
	
	/**
	 * path to the test src for 'testprograms'
	 */
	public static final IPath TEST_SRC_DIR= new Path("testprograms");
	/**
	 * path to the compiler error java file
	 */
	public static final IPath TEST_COMPILE_ERROR = new Path("testresources/CompilationError.java");	

	/**
	 * creates a java project with the specified name and output folder
	 * @param projectName
	 * @param binFolderName
	 * @return a new java project
	 * @throws CoreException
	 */
	public static IJavaProject createJavaProject(String projectName, String binFolderName) throws CoreException {
		IWorkspaceRoot root= ResourcesPlugin.getWorkspace().getRoot();
		IProject project= root.getProject(projectName);
		if (!project.exists()) {
			project.create(null);
		} else {
			project.refreshLocal(IResource.DEPTH_INFINITE, null);
		}
		
		if (!project.isOpen()) {
			project.open(null);
		}
		
		IPath outputLocation;
		if (binFolderName != null && binFolderName.length() > 0) {
			IFolder binFolder= project.getFolder(binFolderName);
			if (!binFolder.exists()) {
				binFolder.create(false, true, null);
			}
			outputLocation= binFolder.getFullPath();
		} else {
			outputLocation= project.getFullPath();
		}
		
		if (!project.hasNature(JavaCore.NATURE_ID)) {
			addNatureToProject(project, JavaCore.NATURE_ID, null);
		}
		
		IJavaProject jproject= JavaCore.create(project);
		
		jproject.setOutputLocation(outputLocation, null);
		jproject.setRawClasspath(new IClasspathEntry[0], null);
		
		return jproject;	
	}
		
	/**
	 * Creates a new Java project with the specified name
	 * @param projectName
	 * @return a new java project with the specified name
	 * @throws CoreException
	 */
	public static IJavaProject createJavaProject(String projectName) throws CoreException {
		IWorkspaceRoot root= ResourcesPlugin.getWorkspace().getRoot();
		IProject project= root.getProject(projectName);
		if (!project.exists()) {
			project.create(null);
		} else {
			project.refreshLocal(IResource.DEPTH_INFINITE, null);
		}
		
		if (!project.isOpen()) {
			project.open(null);
		}
				
		if (!project.hasNature(JavaCore.NATURE_ID)) {
			addNatureToProject(project, JavaCore.NATURE_ID, null);
		}
		
		IJavaProject jproject= JavaCore.create(project);
		
		jproject.setRawClasspath(new IClasspathEntry[0], null);
		
		return jproject;	
	}	
			
	/**
	 * deletes a java project
	 * @param jproject
	 * @throws CoreException
	 */
	public static void delete(IJavaProject jproject) throws CoreException {
		jproject.setRawClasspath(new ClasspathEntry[0], jproject.getProject().getFullPath(), null);
		jproject.getProject().delete(true, true, null);
	}
		
	/**
	 * Adds a new source container specified by the container name to the source path of the specified project
	 * @param jproject
	 * @param containerName
	 * @return the package fragment root of the container name
	 * @throws CoreException
	 */
	public static IPackageFragmentRoot addSourceContainer(IJavaProject jproject, String containerName) throws CoreException {
		IProject project= jproject.getProject();
		IContainer container= null;
		if (containerName == null || containerName.length() == 0) {
			container= project;
		} else {
			IFolder folder= project.getFolder(containerName);
			if (!folder.exists()) {
				folder.create(false, true, null);
			}
			container= folder;
		}
		IPackageFragmentRoot root= jproject.getPackageFragmentRoot(container);
		
		IClasspathEntry cpe= JavaCore.newSourceEntry(root.getPath());
		addToClasspath(jproject, cpe);		
		return root;
	}
	
	/**
	 * Adds a source container to a IJavaProject.
	 * @param jproject
	 * @param containerName
	 * @param outputName
	 * @return the package fragment root of the new source container
	 * @throws CoreException
	 */
	public static IPackageFragmentRoot addSourceContainer(IJavaProject jproject, String containerName, String outputName) throws CoreException {
		IProject project= jproject.getProject();
		IContainer container= null;
		if (containerName == null || containerName.length() == 0) {
			container= project;
		} else {
			IFolder folder= project.getFolder(containerName);
			if (!folder.exists()) {
				folder.create(false, true, null);
			}
			container= folder;
		}
		IPackageFragmentRoot root= jproject.getPackageFragmentRoot(container);

		IFolder output = null;
		if (outputName!= null) {
			output = project.getFolder(outputName);
			if (!output.exists()) {
				output.create(false, true, null);
			}
		}
				
		IClasspathEntry cpe= JavaCore.newSourceEntry(root.getPath(), new IPath[0], output.getFullPath());
		
		addToClasspath(jproject, cpe);		
		return root;
	}	

	/**
	 * Adds a source container to a IJavaProject and imports all files contained
	 * in the given Zip file.
	 * @param jproject
	 * @param containerName
	 * @param zipFile
	 * @return the package fragment root of the new source container
	 * @throws InvocationTargetException
	 * @throws CoreException
	 */
	public static IPackageFragmentRoot addSourceContainerWithImport(IJavaProject jproject, String containerName, ZipFile zipFile) throws InvocationTargetException, CoreException {
		IPackageFragmentRoot root= addSourceContainer(jproject, containerName);
		importFilesFromZip(zipFile, root.getPath(), null);
		return root;
	}

	/**
	 * Removes a source folder from a IJavaProject.
	 * @param jproject
	 * @param containerName
	 * @throws CoreException
	 */
	public static void removeSourceContainer(IJavaProject jproject, String containerName) throws CoreException {
		IFolder folder= jproject.getProject().getFolder(containerName);
		removeFromClasspath(jproject, folder.getFullPath());
		folder.delete(true, null);
	}

	/**
	 * Adds a library entry to a IJavaProject.
	 * @param jproject
	 * @param path
	 * @return the package fragment root of the new library
	 * @throws JavaModelException
	 */
	public static IPackageFragmentRoot addLibrary(IJavaProject jproject, IPath path) throws JavaModelException {
		return addLibrary(jproject, path, null, null);
	}

	/**
	 * Adds a library entry with source attchment to a IJavaProject.
	 * @param jproject
	 * @param path
	 * @param sourceAttachPath
	 * @param sourceAttachRoot
	 * @return the package fragment root of the new library
	 * @throws JavaModelException
	 */
	public static IPackageFragmentRoot addLibrary(IJavaProject jproject, IPath path, IPath sourceAttachPath, IPath sourceAttachRoot) throws JavaModelException {
		IClasspathEntry cpe= JavaCore.newLibraryEntry(path, sourceAttachPath, sourceAttachRoot);
		addToClasspath(jproject, cpe);
		return jproject.getPackageFragmentRoot(path.toString());
	}

	/**
	 * Copies the library into the project and adds it as library entry.
	 * @param jproject
	 * @param jarPath
	 * @param sourceAttachPath
	 * @param sourceAttachRoot
	 * @return the package fragment root of the new library
	 * @throws IOException
	 * @throws CoreException
	 */
	public static IPackageFragmentRoot addLibraryWithImport(IJavaProject jproject, IPath jarPath, IPath sourceAttachPath, IPath sourceAttachRoot) throws IOException, CoreException {
		IProject project= jproject.getProject();
		IFile newFile= project.getFile(jarPath.lastSegment());
		InputStream inputStream= null;
		try {
			inputStream= new FileInputStream(jarPath.toFile()); 
			newFile.create(inputStream, true, null);
		} finally {
			if (inputStream != null) {
				try { inputStream.close(); } catch (IOException e) { }
			}
		}				
		return addLibrary(jproject, newFile.getFullPath(), sourceAttachPath, sourceAttachRoot);
	}	

		
	/**
	 * Adds a variable entry with source attachment to a IJavaProject.
	 * Can return null if variable can not be resolved.
	 * @param jproject
	 * @param path
	 * @param sourceAttachPath
	 * @param sourceAttachRoot
	 * @return the package fragment root of the new variable entry
	 * @throws JavaModelException
	 */
	public static IPackageFragmentRoot addVariableEntry(IJavaProject jproject, IPath path, IPath sourceAttachPath, IPath sourceAttachRoot) throws JavaModelException {
		IClasspathEntry cpe= JavaCore.newVariableEntry(path, sourceAttachPath, sourceAttachRoot);
		addToClasspath(jproject, cpe);
		IPath resolvedPath= JavaCore.getResolvedVariablePath(path);
		if (resolvedPath != null) {
			return jproject.getPackageFragmentRoot(resolvedPath.toString());
		}
		return null;
	}
	
	/**
	 * Adds a container entry to the specified java project
	 * @param project
	 * @param container
	 * @throws JavaModelException
	 */
	public static void addContainerEntry(IJavaProject project, IPath container) throws JavaModelException {
		IClasspathEntry cpe = JavaCore.newContainerEntry(container, false);
		addToClasspath(project, cpe);
	}
	
	/**
	 * Adds a required project entry.
	 * @param jproject
	 * @param required
	 * @throws JavaModelException
	 */
	public static void addRequiredProject(IJavaProject jproject, IJavaProject required) throws JavaModelException {
		IClasspathEntry cpe= JavaCore.newProjectEntry(required.getProject().getFullPath());
		addToClasspath(jproject, cpe);
	}	
	
	/**
	 * Removes a specified path form the specified java project
	 * @param jproject
	 * @param path
	 * @throws JavaModelException
	 */
	public static void removeFromClasspath(IJavaProject jproject, IPath path) throws JavaModelException {
		IClasspathEntry[] oldEntries= jproject.getRawClasspath();
		int nEntries= oldEntries.length;
		ArrayList list= new ArrayList(nEntries);
		for (int i= 0 ; i < nEntries ; i++) {
			IClasspathEntry curr= oldEntries[i];
			if (!path.equals(curr.getPath())) {
				list.add(curr);			
			}
		}
		IClasspathEntry[] newEntries= (IClasspathEntry[])list.toArray(new IClasspathEntry[list.size()]);
		jproject.setRawClasspath(newEntries, null);
	}	

	/**
	 * Adds the specified classpath entry to the specified java project
	 * @param jproject
	 * @param cpe
	 * @throws JavaModelException
	 */
	private static void addToClasspath(IJavaProject jproject, IClasspathEntry cpe) throws JavaModelException {
		IClasspathEntry[] oldEntries= jproject.getRawClasspath();
		for (int i= 0; i < oldEntries.length; i++) {
			if (oldEntries[i].equals(cpe)) {
				return;
			}
		}
		int nEntries= oldEntries.length;
		IClasspathEntry[] newEntries= new IClasspathEntry[nEntries + 1];
		System.arraycopy(oldEntries, 0, newEntries, 0, nEntries);
		newEntries[nEntries]= cpe;
		jproject.setRawClasspath(newEntries, null);
	}
	
			
	/**
	 * Adds the specified nature to the specified project
	 * @param proj
	 * @param natureId
	 * @param monitor
	 * @throws CoreException
	 */
	private static void addNatureToProject(IProject proj, String natureId, IProgressMonitor monitor) throws CoreException {
		IProjectDescription description = proj.getDescription();
		String[] prevNatures= description.getNatureIds();
		String[] newNatures= new String[prevNatures.length + 1];
		System.arraycopy(prevNatures, 0, newNatures, 0, prevNatures.length);
		newNatures[prevNatures.length]= natureId;
		description.setNatureIds(newNatures);
		proj.setDescription(description, monitor);
	}
	
	/**
	 * Imports files from the specified zip to the specified destination
	 * @param srcZipFile
	 * @param destPath
	 * @param monitor
	 * @throws InvocationTargetException
	 */
	private static void importFilesFromZip(ZipFile srcZipFile, IPath destPath, IProgressMonitor monitor) throws InvocationTargetException {		
		ZipFileStructureProvider structureProvider=	new ZipFileStructureProvider(srcZipFile);
		try {
			ImportOperation op= new ImportOperation(destPath, structureProvider.getRoot(), structureProvider, new ImportOverwriteQuery());
			op.run(monitor);
		} catch (InterruptedException e) {
			// should not happen
		}
	}
	
	/**
	 * Imports files form the specified root dir into the specified path
	 * @param rootDir
	 * @param destPath
	 * @param monitor
	 * @throws InvocationTargetException
	 * @throws IOException
	 */
	public static void importFilesFromDirectory(File rootDir, IPath destPath, IProgressMonitor monitor) throws InvocationTargetException, IOException {		
		IImportStructureProvider structureProvider = FileSystemStructureProvider.INSTANCE;
		List files = new ArrayList(100);
		addJavaFiles(rootDir, files);
		try {
			ImportOperation op= new ImportOperation(destPath, rootDir, structureProvider, new ImportOverwriteQuery(), files);
			op.setCreateContainerStructure(false);
			op.run(monitor);
		} catch (InterruptedException e) {
			// should not happen
		}
	}	
	
	/**
	 * Imports the specified file into the specified path
	 * @param file
	 * @param destPath
	 * @param monitor
	 * @throws InvocationTargetException
	 */
	public static void importFile(File file, IPath destPath, IProgressMonitor monitor) throws InvocationTargetException {		
		IImportStructureProvider structureProvider = FileSystemStructureProvider.INSTANCE;
		List files = new ArrayList(1);
		files.add(file);
		try {
			ImportOperation op= new ImportOperation(destPath, file.getParentFile(), structureProvider, new ImportOverwriteQuery(), files);
			op.setCreateContainerStructure(false);
			op.run(monitor);
		} catch (InterruptedException e) {
			// should not happen
		}
	}
	
	/**
	 * Recursively adds files from the specified dir to the provided list
	 * @param dir
	 * @param collection
	 * @throws IOException
	 */
	private static void addJavaFiles(File dir, List collection) throws IOException {
		File[] files = dir.listFiles();
		List subDirs = new ArrayList(2);
		for (int i = 0; i < files.length; i++) {
			if (files[i].isFile()) {
				collection.add(files[i]);
			} else if (files[i].isDirectory()) {
				subDirs.add(files[i]);
			}
		}
		Iterator iter = subDirs.iterator();
		while (iter.hasNext()) {
			File subDir = (File)iter.next();
			addJavaFiles(subDir, collection);
		}
	}
	
	/**
	 * Static class for an <code>IOverwriteQuery</code> implementation
	 */
	private static class ImportOverwriteQuery implements IOverwriteQuery {
		/**
		 * @see org.eclipse.ui.dialogs.IOverwriteQuery#queryOverwrite(java.lang.String)
		 */
		public String queryOverwrite(String file) {
			return ALL;
		}	
	}		
	
	
}