/*******************************************************************************
 * Copyright (c) 2003, 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.jst.j2ee.internal.archive.operations;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jem.workbench.utility.JemProjectUtilities;
import org.eclipse.jst.j2ee.commonarchivecore.internal.Archive;
import org.eclipse.jst.j2ee.commonarchivecore.internal.EARFile;
import org.eclipse.jst.j2ee.commonarchivecore.internal.File;
import org.eclipse.jst.j2ee.commonarchivecore.internal.exception.SaveFailureException;
import org.eclipse.jst.j2ee.commonarchivecore.internal.util.ArchiveUtil;
import org.eclipse.jst.j2ee.datamodel.properties.IEARComponentImportDataModelProperties;
import org.eclipse.jst.j2ee.datamodel.properties.IJ2EEComponentImportDataModelProperties;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;

public class EARComponentSaveStrategyImpl extends J2EEComponentSaveStrategyImpl implements IJ2EEImportExportConstants {

	protected Map createdComponentsMap;

	public EARComponentSaveStrategyImpl(IVirtualComponent component) {
		super(component);
	}

	public void setDataModel(IDataModel dataModel) {
		super.setDataModel(dataModel);

		setArchive((Archive) dataModel.getProperty(IEARComponentImportDataModelProperties.FILE));
		overwriteHandler = (IOverwriteHandler) dataModel.getProperty(IEARComponentImportDataModelProperties.OVERWRITE_HANDLER);
		if (null != overwriteHandler) {
			overwriteHandler.setEarSaveStrategy(this);
		}
		buildProjectsMap();
	}


	/**
	 * Creates a Map mapping archive uris to projects for all archives in the ear that imported as
	 * projects.
	 */
	private void buildProjectsMap() {
		createdComponentsMap = new HashMap();
		List createdProjectsList = (List) dataModel.getProperty(IEARComponentImportDataModelProperties.ALL_PROJECT_MODELS_LIST);
		IDataModel importDM = null;
		Archive anArchive = null;
		for (int i = 0; i < createdProjectsList.size(); i++) {
			importDM = (IDataModel) createdProjectsList.get(i);
			anArchive = (Archive) importDM.getProperty(IJ2EEComponentImportDataModelProperties.FILE);
			createdComponentsMap.put(anArchive.getURI(), importDM.getProperty(IJ2EEComponentImportDataModelProperties.COMPONENT));
		}
	}

	protected void addFileToClasspath(IProject p, IFile file, List cp) {
		if (!file.exists())
			return;

		// Assume the file also contains the source
		IPath path = file.getFullPath();
		IClasspathEntry entry = JavaCore.newLibraryEntry(path, path, null, true);
		if (!cp.contains(entry))
			cp.add(entry);
	}

	protected void addProjectToClasspath(IProject dependent, IProject prereq, List cp) {
		IClasspathEntry entry = JavaCore.newProjectEntry(prereq.getFullPath(), true);
		if (!cp.contains(entry))
			cp.add(entry);
	}

	protected EARFile getEARFile() {
		return (EARFile) getArchive();
	}


	protected java.io.OutputStream getOutputStreamForResource(org.eclipse.emf.ecore.resource.Resource aResource) throws java.io.IOException {
		return null;
	}

	public void save() throws SaveFailureException {

		saveFiles();
		saveManifest();
		saveMofResources();
		progressMonitor.subTask(EARArchiveOpsResourceHandler.getString("Updating_project_classpath_UI_")); //$NON-NLS-1$ = "Updating project classpaths..."
		updateComponentClasspaths();

	}

	public void save(Archive anArchive) throws SaveFailureException {
		progressMonitor.subTask(anArchive.getURI());
		saveArchiveAsJARInEAR(anArchive);
	}

	protected void saveArchiveAsJARInEAR(Archive anArchive) throws SaveFailureException {
		try {
			anArchive.save(createNestedSaveStrategy(anArchive));
			progressMonitor.worked(1);
		} catch (IOException e) {
			throw new SaveFailureException(anArchive.getURI(), e);
		}
	}

	protected SubProgressMonitor subMonitor() {
		return new SubProgressMonitor(progressMonitor, 10);
	}

	public void setMonitor(org.eclipse.core.runtime.IProgressMonitor newMonitor) {
		progressMonitor = newMonitor;
	}

	protected boolean shouldSave(File aFile) {
		if (aFile.isArchive()) {
			if (operationHandlesNested((Archive) aFile)) {
				return false;
			}
			return getFilter().shouldSave(aFile.getURI(), getArchive());
		}
		return super.shouldSave(aFile);
	}

	protected boolean operationHandlesNested(Archive archive) {
		if (null != dataModel) {
			List list = (List) dataModel.getProperty(IEARComponentImportDataModelProperties.HANDLED_PROJECT_MODELS_LIST);
			for (int i = 0; i < list.size(); i++) {
				if (archive == ((IDataModel) list.get(i)).getProperty(IEARComponentImportDataModelProperties.FILE)) {
					return true;
				}
			}
		}
		return false;
	}

	protected boolean shouldSave(String uri) {
		if (overwriteHandler != null) {
			if (overwriteHandler.isOverwriteNone())
				return false;
			return ((super.shouldSave(uri)) && (!overwriteHandler.isOverwriteResources()) && (!overwriteHandler.isOverwriteAll()) && (overwriteHandler.shouldOverwrite(uri)));
		}
		return true;
	}


	/*
	 * Parse the manifest of the module file; for each cp entry 1) cananonicalize to a uri that
	 * looks like the entry in the ear 2) If the ear contains a file with that uri (the entry is
	 * valid) a) If the file is another was blown out to a project, add a cp entry for a referenced
	 * project b) otherwise, add a cp entry that points to the file in the ear project, and cp
	 * entries for all prereqs
	 */
	protected void updateProjectClasspath(Archive anArchive, IVirtualComponent component) {

		String message = EARArchiveOpsResourceHandler.getString("Updating_project_classpath_UI_") + component.getName(); //$NON-NLS-1$ = "Updating project classpaths..."
		progressMonitor.subTask(message);
		List projectCpEntries = new ArrayList();
		Set visited = new HashSet();
		traverseClasspaths(component.getProject(), anArchive, projectCpEntries, visited);

		try {
			if (!projectCpEntries.isEmpty())
				JemProjectUtilities.appendJavaClassPath(component.getProject(), projectCpEntries);
			JemProjectUtilities.forceClasspathReload(component.getProject());
		} catch (JavaModelException ex) {
			org.eclipse.jem.util.logger.proxy.Logger.getLogger().logError(ex);
		}

	}

	/*
	 * If you have a dependency to a JAR in the EAR project, and the JAR depends on another JAR in
	 * the EAR; you want to compile cleanly after import, so you need both those JARs on your build
	 * path
	 */
	protected void traverseClasspaths(IProject p, Archive anArchive, List projectCpEntries, Set visitedArchives) {
		visitedArchives.add(anArchive);
		String[] manifestCpEntries = anArchive.getManifest().getClassPathTokenized();
		EARFile earFile = (EARFile) dataModel.getProperty(IJ2EEComponentImportDataModelProperties.FILE);
		for (int i = 0; i < manifestCpEntries.length; i++) {
			String uri = ArchiveUtil.deriveEARRelativeURI(manifestCpEntries[i], anArchive);
			// ensure the entry is valid or skip to the next
			if (uri == null)
				continue;
			File aFile = null;
			try {
				aFile = earFile.getFile(uri);
			} catch (FileNotFoundException notThere) {
			}
			if (aFile == null || !aFile.isArchive() || visitedArchives.contains(aFile))
				continue;
			Archive depArchive = (Archive) aFile;
			IProject prereq = null;
			IVirtualComponent depComponent = (IVirtualComponent) createdComponentsMap.get(uri);
			if (depComponent != null)
				prereq = depComponent.getProject();

			if (prereq != null) {
				addProjectToClasspath(p, prereq, projectCpEntries);
			} else {
				addFileToClasspath(p, vComponent.getRootFolder().getFile(uri).getUnderlyingFile(), projectCpEntries);
				traverseClasspaths(p, depArchive, projectCpEntries, visitedArchives);
			}
		}
	}

	protected void updateComponentClasspaths() {
		List jarFiles = getEARFile().getArchiveFiles();
		for (int i = 0; i < jarFiles.size(); i++) {
			Archive anArchive = (Archive) jarFiles.get(i);
			IVirtualComponent component = (IVirtualComponent) createdComponentsMap.get(anArchive.getURI());
			if (component != null)
				updateProjectClasspath(anArchive, component);
		}
	}

}