/*******************************************************************************
 * 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:
 * rfrost@bea.com - initial API and implementation
 *******************************************************************************/

package org.eclipse.jst.j2ee.refactor.operations;

import java.util.Arrays;
import java.util.List;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jst.j2ee.refactor.RefactorResourceHandler;
import org.eclipse.wst.common.frameworks.datamodel.AbstractDataModelOperation;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.server.core.IModule;
import org.eclipse.wst.server.core.IServer;
import org.eclipse.wst.server.core.IServerWorkingCopy;
import org.eclipse.wst.server.core.ServerUtil;

/**
 * Abstract base class for project refactoring operations.
 */
public abstract class ProjectRefactorOperation extends AbstractDataModelOperation 
	implements ProjectRefactoringProperties {

	/**
	 * Creates a new refactoring operation for the specified data model.
	 * @param model The data model.
	 */
	public ProjectRefactorOperation(final IDataModel model) {
		super(model);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.core.commands.operations.IUndoableOperation#execute(org.eclipse.core.runtime.IProgressMonitor, org.eclipse.core.runtime.IAdaptable)
	 */
	public IStatus execute(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
		try {
			final ProjectRefactorMetadata refactoredMetadata = (ProjectRefactorMetadata) getProjectMetadata();

			// Update this project's metadata
			if (refactoredMetadata.hasModuleCoreNature()) {
				updateProject(refactoredMetadata);
			}
			
			// Update metadata for dependent projects
			updateDependentProjects(refactoredMetadata, monitor);
			
		} finally {
			if (monitor != null) {
				monitor.done();
			}
		}

		return Status.OK_STATUS;
	}

	/**
	 * Updates the project's own metadata.
	 */
	protected abstract void updateProject(final ProjectRefactorMetadata refactoredMetadata) 
	throws ExecutionException;
	
	/**
	 * Updates the metadata for dependent projects
	 * @throws ExecutionException
	 */
	protected void updateDependentProjects(final ProjectRefactorMetadata refactoredMetadata,
			final IProgressMonitor monitor) throws ExecutionException {
		// get the metadata for all dependent projects
		final ProjectRefactorMetadata[] dependentMetadata = refactoredMetadata.getDependentMetadata();
		if (monitor != null) {
			monitor.beginTask(RefactorResourceHandler.getString("task_name"), dependentMetadata.length); 
		}
		ProjectRefactorMetadata metadata;
		for (int i = 0; i < dependentMetadata.length; i++) {
			metadata = dependentMetadata[i];
			// if the project is an EAR, execute the update operation created by the
			// DependentEARUpdateProvider; if the project is a non-EAR project with the
			// module core nature, execute the appropriate update
			if (metadata.isEAR()) {
				updateDependentEARProject(metadata, refactoredMetadata);
			} else if (metadata.hasModuleCoreNature()) { 
				updateDependentModuleProject(metadata, refactoredMetadata);
			}
			if (monitor != null) {
				monitor.worked(1);
			}
		}
	}
	
	/**
	 * Updates any server references.
	 */
	protected void updateServerRefs(final ProjectRefactorMetadata originalMetadata, 
			final ProjectRefactorMetadata newMetadata)
		throws ExecutionException {
		final IModule originalModule = originalMetadata.getModule();
		if (originalModule == null) {
			// no module for the original project, so return
			return;
		}
		final IModule[] toRemove = new IModule[]{originalModule};
		
		IModule newModule = null;
		IModule[] toAdd = new IModule[0];
		if (newMetadata != null) {
			newModule = newMetadata.getModule();
			if (newModule == null) {
				// no module for the new project, so return
				return;
			}
			toAdd = new IModule[]{newModule};
		}
		
		final IServer[] server = originalMetadata.getServers();
		IServerWorkingCopy wc = null;
		for (int i = 0; i < server.length; i++) {
			try {
				wc = server[i].createWorkingCopy();
				List list = Arrays.asList(server[i].getModules());
				if (list.contains(originalModule)) {
					// remove the original and potentially add a new
					ServerUtil.modifyModules(wc, toAdd, toRemove, null);
				}
			} catch (CoreException ce) {
				throw new ExecutionException(RefactorResourceHandler.getString("error_updating_server", 
						new Object[]{server[i].getId(), originalMetadata.getProjectName()}), ce);
			} finally {
				try {
					wc.saveAll(true, null);
				} catch (CoreException ce) {
					throw new ExecutionException(RefactorResourceHandler.getString("error_updating_server", 
							new Object[]{server[i].getId(), originalMetadata.getProjectName()}), ce);					
				}
			}
		}
	}
	
	/**
	 * Updates the dependent EAR project to account for the refactoring of the referenced project.
	 */
	protected abstract void updateDependentEARProject(final ProjectRefactorMetadata dependentMetadata, 
			final ProjectRefactorMetadata refactoredMetadata) throws ExecutionException;
	
	/**
	 * Updates the dependent module project to account for the refactoring of the referenced project.
	 */
	protected abstract void updateDependentModuleProject(final ProjectRefactorMetadata dependentMetadata, 
			final ProjectRefactorMetadata refactoredMetadata) throws ExecutionException;

	/**
	 * Retrieves the ProjectRefactorMetadata property.
	 */
	protected ProjectRefactorMetadata getProjectMetadata() {
		return (ProjectRefactorMetadata) model.getProperty(PROJECT_METADATA);
	}
	
	/**
	 * Override to disable redo support
	 * @see org.eclipse.core.commands.operations.IUndoableOperation#canRedo()
	 */
	public boolean canRedo() {
		return false;
	}

	/**
	 * Override to disable undo support.
	 * @see org.eclipse.core.commands.operations.IUndoableOperation#canUndo()
	 */
	public boolean canUndo() {
		return false;
	}
	
}