/*******************************************************************************
 * Copyright (c) 2004, 2011 Tasktop Technologies and others.
 * 
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * https://www.eclipse.org/legal/epl-2.0
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *     Tasktop Technologies - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.context.sdk.java;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.MalformedURLException;
import java.net.URL;

import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.IncrementalProjectBuilder;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.search.IJavaSearchConstants;
import org.eclipse.jdt.core.search.SearchEngine;
import org.eclipse.jdt.core.search.SearchPattern;
import org.eclipse.jdt.core.search.TypeNameRequestor;
import org.eclipse.jdt.launching.JavaRuntime;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.actions.WorkspaceModifyOperation;
import org.eclipse.ui.progress.IProgressService;

/**
 * From Erich Gamma's "Contributing to Eclipse" book.
 * 
 * @author Mik Kersten
 */
public class TestJavaProject {
	public IProject project;

	public IJavaProject javaProject;

	private IPackageFragmentRoot sourceFolder;

	public TestJavaProject(final String name) throws CoreException, InvocationTargetException, InterruptedException {
		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		project = root.getProject(name);
		project.create(null);
		project.open(null);

		javaProject = JavaCore.create(project);
		IFolder binFolder = createBinFolder();
		setJavaNature();
		javaProject.setRawClasspath(new IClasspathEntry[0], null);
		createOutputFolder(binFolder);
		addSystemLibraries();
	}

	public IProject getProject() {
		return project;
	}

	public IJavaProject getJavaProject() {
		return javaProject;
	}

	public void build() throws CoreException, InvocationTargetException, InterruptedException {
		WorkspaceModifyOperation op = new WorkspaceModifyOperation() {
			@Override
			protected void execute(IProgressMonitor monitor) throws CoreException {
				project.build(IncrementalProjectBuilder.FULL_BUILD, null);
			};
		};
		IProgressService service = PlatformUI.getWorkbench().getProgressService();
		service.run(true, true, op);
	}

	public IPackageFragment createPackage(String name) throws CoreException {
		if (sourceFolder == null) {
			sourceFolder = createSourceFolder();
		}
		return sourceFolder.createPackageFragment(name, false, null);
	}

	public IType createType(IPackageFragment pack, String cuName, String source) throws JavaModelException {
		StringBuffer buf = new StringBuffer();
		buf.append("package " + pack.getElementName() + ";\n");
		buf.append("\n");
		buf.append(source);
		ICompilationUnit cu = pack.createCompilationUnit(cuName, buf.toString(), false, null);
		return cu.getTypes()[0];
	}

	private IFolder createBinFolder() throws CoreException {
		IFolder binFolder = project.getFolder("bin");
		binFolder.create(false, true, null);
		return binFolder;
	}

	private void setJavaNature() throws CoreException {
		IProjectDescription description = project.getDescription();
		description.setNatureIds(new String[] { JavaCore.NATURE_ID });
		project.setDescription(description, null);
	}

	private void createOutputFolder(IFolder binFolder) throws JavaModelException {
		IPath outputLocation = binFolder.getFullPath();
		javaProject.setOutputLocation(outputLocation, null);
	}

	private IPackageFragmentRoot createSourceFolder() throws CoreException {
		IFolder folder = project.getFolder("src");
		folder.create(false, true, null);
		IPackageFragmentRoot root = javaProject.getPackageFragmentRoot(folder);

		IClasspathEntry[] oldEntries = javaProject.getRawClasspath();
		IClasspathEntry[] newEntries = new IClasspathEntry[oldEntries.length + 1];
		System.arraycopy(oldEntries, 0, newEntries, 0, oldEntries.length);
		newEntries[oldEntries.length] = JavaCore.newSourceEntry(root.getPath());
		javaProject.setRawClasspath(newEntries, null);
		return root;
	}

	private void addSystemLibraries() throws JavaModelException {
		IClasspathEntry[] oldEntries = javaProject.getRawClasspath();
		IClasspathEntry[] newEntries = new IClasspathEntry[oldEntries.length + 1];
		System.arraycopy(oldEntries, 0, newEntries, 0, oldEntries.length);
		newEntries[oldEntries.length] = JavaRuntime.getDefaultJREContainerEntry();
		javaProject.setRawClasspath(newEntries, null);
	}

	public void addJar(Plugin plugin, String jar) throws MalformedURLException, IOException, JavaModelException {
		Path result = findFileInPlugin(plugin, jar);
		IClasspathEntry[] oldEntries = javaProject.getRawClasspath();
		IClasspathEntry[] newEntries = new IClasspathEntry[oldEntries.length + 1];
		System.arraycopy(oldEntries, 0, newEntries, 0, oldEntries.length);
		newEntries[oldEntries.length] = JavaCore.newLibraryEntry(result, null, null);
		javaProject.setRawClasspath(newEntries, null);
	}

	private Path findFileInPlugin(Plugin plugin, String file) throws MalformedURLException, IOException {
		// Plugin p = Platform.getPlugin(plugin);
		URL pluginURL = plugin.getBundle().getEntry("/");
		URL jarURL = new URL(pluginURL, file);
		URL localJarURL = FileLocator.toFileURL(jarURL);//Platform.asLocalURL(jarURL);
		return new Path(localJarURL.getPath());
	}

	@SuppressWarnings("deprecation")
	public void waitForIndexer() throws JavaModelException {
		new SearchEngine().searchAllTypeNames(null, null, SearchPattern.R_EXACT_MATCH, IJavaSearchConstants.CLASS,
				SearchEngine.createJavaSearchScope(new IJavaElement[0]), new TypeNameRequestor() {
					// nothing needs to be done here...we accept everything
				}, IJavaSearchConstants.WAIT_UNTIL_READY_TO_SEARCH, null);
	}
}