/******************************************************************************
 * Copyright (c) 2005 BEA Systems, Inc.
 * 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:
 *    Konstantin Komissarchik - initial API and implementation
 ******************************************************************************/

package org.eclipse.jst.j2ee.web.project.facet;

import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspace;
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.emf.ecore.EPackage;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jem.util.emf.workbench.ProjectUtilities;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.eclipse.jst.common.project.facet.WtpUtils;
import org.eclipse.jst.common.project.facet.core.ClasspathHelper;
import org.eclipse.jst.j2ee.application.ApplicationPackage;
import org.eclipse.jst.j2ee.application.Module;
import org.eclipse.jst.j2ee.application.internal.operations.AddComponentToEnterpriseApplicationDataModelProvider;
import org.eclipse.jst.j2ee.application.internal.operations.AddComponentToEnterpriseApplicationOp;
import org.eclipse.jst.j2ee.application.internal.operations.IAddComponentToEnterpriseApplicationDataModelProperties;
import org.eclipse.jst.j2ee.internal.common.J2EEVersionUtil;
import org.eclipse.jst.j2ee.internal.project.J2EEProjectUtilities;
import org.eclipse.jst.j2ee.internal.web.classpath.WebAppContainer;
import org.eclipse.jst.j2ee.project.facet.J2EEFacetInstallDelegate;
import org.eclipse.jst.j2ee.web.componentcore.util.WebArtifactEdit;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.datamodel.FacetDataModelProvider;
import org.eclipse.wst.common.componentcore.datamodel.properties.ICreateReferenceComponentsDataModelProperties;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualFolder;
import org.eclipse.wst.common.frameworks.datamodel.DataModelFactory;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.common.frameworks.datamodel.IDataModelOperation;
import org.eclipse.wst.common.project.facet.core.IDelegate;
import org.eclipse.wst.common.project.facet.core.IFacetedProject;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;
import org.eclipse.wst.common.project.facet.core.ProjectFacetsManager;

public final class WebFacetInstallDelegate extends J2EEFacetInstallDelegate implements IDelegate {

	public void execute(final IProject project, final IProjectFacetVersion fv, final Object cfg, final IProgressMonitor monitor) throws CoreException {
		if (monitor != null) {
			monitor.beginTask("", 1);
		}

		try {
			final IDataModel model = (IDataModel) cfg;

			final IJavaProject jproj = JavaCore.create(project);

			// Add WTP natures.

			WtpUtils.addNatures(project);

			// Create the directory structure.

			final IWorkspace ws = ResourcesPlugin.getWorkspace();
			final IPath pjpath = project.getFullPath();

			final IPath contentdir = setContentPropertyIfNeeded(model, pjpath, project);
			final IPath sourcedir = setSourcePropertyIfNeeded(model, pjpath, project);
			mkdirs(ws.getRoot().getFolder(contentdir));

			final IPath webinf = contentdir.append("WEB-INF");
			IFolder webinfFolder = ws.getRoot().getFolder(webinf);
			mkdirs(webinfFolder);

			final IPath webinflib = webinf.append("lib");
			mkdirs(ws.getRoot().getFolder(webinflib));


			try {
				createManifest(project, ws.getRoot().getFolder(contentdir), monitor);
			} catch (InvocationTargetException e) {
				Logger.getLogger().logError(e);
			} catch (InterruptedException e) {
				Logger.getLogger().logError(e);
			}


			// Setup the flexible project structure.

			final IVirtualComponent c = ComponentCore.createComponent(project);

			c.create(0, null);

			String contextRoot = model.getStringProperty(IWebFacetInstallDataModelProperties.CONTEXT_ROOT);
			if (contextRoot == null || contextRoot.length() == 0)
				contextRoot = project.getName();
			setContextRootPropertyIfNeeded(c, contextRoot);
			setJavaOutputPropertyIfNeeded(c);

			final IVirtualFolder jsrc = c.getRootFolder().getFolder("/WEB-INF/classes");
			final IClasspathEntry[] cp = jproj.getRawClasspath();

			for (int i = 0; i < cp.length; i++) {
				final IClasspathEntry cpe = cp[i];

				if (cpe.getEntryKind() == IClasspathEntry.CPE_SOURCE) {
					jsrc.createLink(cpe.getPath().removeFirstSegments(1), 0, null);
				}
			}

			final IVirtualFolder webroot = c.getRootFolder();
			if (webroot.getProjectRelativePath().equals(new Path("/")))
				webroot.createLink(new Path("/" + model.getStringProperty(IWebFacetInstallDataModelProperties.CONFIG_FOLDER)), 0, null);

			// Create the deployment descriptor (web.xml) if one doesn't exist
			if (!webinfFolder.getFile("web.xml").exists()) {
				String ver = fv.getVersionString();
				int nVer = J2EEVersionUtil.convertVersionStringToInt(ver);
				WebArtifactEdit.createDeploymentDescriptor(project, nVer);
			}

			// Setup the classpath.

			ClasspathHelper.removeClasspathEntries(project, fv);

			if (!ClasspathHelper.addClasspathEntries(project, fv)) {
				// TODO: Support the no runtime case.
				// ClasspathHelper.addClasspathEntries( project, fv, <something> );
			}

			// Add the web libraries container.

			final IPath cont = new Path(WebAppContainer.CONTAINER_ID);
			addToClasspath(jproj, JavaCore.newContainerEntry(cont));

			// Associate with an EAR, if necessary.


			if (model.getBooleanProperty(IWebFacetInstallDataModelProperties.ADD_TO_EAR)) {
				final String earProjectName = model.getStringProperty(IWebFacetInstallDataModelProperties.EAR_PROJECT_NAME);
				if (earProjectName != null && !earProjectName.equals("")) { //$NON-NLS-1$
					String ver = fv.getVersionString();
					String j2eeVersionText = J2EEVersionUtil.convertVersionIntToString(J2EEVersionUtil.convertWebVersionStringToJ2EEVersionID(ver));
					IFacetedProject facetedProject = ProjectFacetsManager.create(project);
					installEARFacet(j2eeVersionText, earProjectName, facetedProject.getRuntime(), monitor);

					IProject earProject = ProjectUtilities.getProject(earProjectName);
					IVirtualComponent earComp = ComponentCore.createComponent(earProject);

					final IDataModel dataModel = DataModelFactory.createDataModel(new AddComponentToEnterpriseApplicationDataModelProvider() {
						public Object getDefaultProperty(String propertyName) {
							if (IAddComponentToEnterpriseApplicationDataModelProperties.TARGET_COMPONENTS_TO_URI_MAP.equals(propertyName)) {
								Map map = new HashMap();
								List components = (List) getProperty(TARGET_COMPONENT_LIST);
								for (int i = 0; i < components.size(); i++) {
									IVirtualComponent component = (IVirtualComponent) components.get(i);
									String name = component.getName();
									name += ".war"; //$NON-NLS-1$
									map.put(component, name);
								}
								return map;
							}
							return super.getDefaultProperty(propertyName);
						}

						public IDataModelOperation getDefaultOperation() {
							return new AddComponentToEnterpriseApplicationOp(model) {
								protected Module createNewModule(IVirtualComponent wc) {
									return ((ApplicationPackage) EPackage.Registry.INSTANCE.getEPackage(ApplicationPackage.eNS_URI)).getApplicationFactory().createWebModule();
								}
							};
						}
					});
					dataModel.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT, earComp);
					List modList = (List) dataModel.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST);
					modList.add(c);
					dataModel.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST, modList);
					try {
						dataModel.getDefaultOperation().execute(null, null);
					} catch (ExecutionException e) {
						Logger.getLogger().logError(e);
					}

				}
			}

			try {
				((IDataModelOperation) model.getProperty(FacetDataModelProvider.NOTIFICATION_OPERATION)).execute(monitor, null);
			} catch (ExecutionException e) {
				Logger.getLogger().logError(e);
			}

			if (monitor != null) {
				monitor.worked(1);
			}
		} finally {
			if (monitor != null) {
				monitor.done();
			}
		}
	}

	private void setJavaOutputPropertyIfNeeded(final IVirtualComponent c) {
		String existing = c.getMetaProperties().getProperty("java-output-path");
		if (existing == null)
			c.setMetaProperty("java-output-path", "/build/classes/");
	}

	private void setContextRootPropertyIfNeeded(final IVirtualComponent c, String contextRoot) {
		String existing = c.getMetaProperties().getProperty("context-root");
		if (existing == null)
			c.setMetaProperty("context-root", contextRoot);
	}

	private IPath setSourcePropertyIfNeeded(final IDataModel model, final IPath pjpath, IProject project) {
		IVirtualComponent c = ComponentCore.createComponent(project);
		if (c.exists()) {
			return J2EEProjectUtilities.getSourcePathOrFirst(project, null).makeAbsolute();
		}
		return pjpath.append(model.getStringProperty(IWebFacetInstallDataModelProperties.SOURCE_FOLDER));
	}

	private IPath setContentPropertyIfNeeded(final IDataModel model, final IPath pjpath, IProject project) {
		IVirtualComponent c = ComponentCore.createComponent(project);
		if (c.exists()) {
			return c.getRootFolder().getUnderlyingResource().getFullPath();
		}
		return pjpath.append(model.getStringProperty(IWebFacetInstallDataModelProperties.CONFIG_FOLDER));
	}

	private static void addToClasspath(final IJavaProject jproj, final IClasspathEntry entry)

	throws CoreException

	{
		final IClasspathEntry[] current = jproj.getRawClasspath();
		final IClasspathEntry[] updated = new IClasspathEntry[current.length + 1];
		System.arraycopy(current, 0, updated, 0, current.length);
		updated[current.length] = entry;
		jproj.setRawClasspath(updated, null);
	}

	private static void mkdirs(final IFolder folder)

	throws CoreException

	{
		if (!folder.exists()) {
			if (folder.getParent() instanceof IFolder) {
				mkdirs((IFolder) folder.getParent());
			}

			folder.create(true, true, null);
		}
	}
}