/*******************************************************************************
 * 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.wst.common.componentcore.internal.util;

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

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.IResource;
import org.eclipse.core.resources.ResourceAttributes;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jem.util.emf.workbench.ProjectUtilities;
import org.eclipse.wst.common.componentcore.ArtifactEdit;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.ModuleCoreNature;
import org.eclipse.wst.common.componentcore.datamodel.properties.ICreateReferenceComponentsDataModelProperties;
import org.eclipse.wst.common.componentcore.internal.Property;
import org.eclipse.wst.common.componentcore.internal.StructureEdit;
import org.eclipse.wst.common.componentcore.internal.WorkbenchComponent;
import org.eclipse.wst.common.componentcore.internal.operation.CreateReferenceComponentsDataModelProvider;
import org.eclipse.wst.common.componentcore.internal.operation.CreateReferenceComponentsOp;
import org.eclipse.wst.common.componentcore.internal.operation.RemoveReferenceComponentOperation;
import org.eclipse.wst.common.componentcore.internal.operation.RemoveReferenceComponentsDataModelProvider;
import org.eclipse.wst.common.componentcore.internal.resources.ResourceTimestampMappings;
import org.eclipse.wst.common.componentcore.internal.resources.VirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualFolder;
import org.eclipse.wst.common.componentcore.resources.IVirtualReference;
import org.eclipse.wst.common.componentcore.resources.IVirtualResource;
import org.eclipse.wst.common.frameworks.datamodel.DataModelFactory;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.common.internal.emfworkbench.WorkbenchResourceHelper;

public class ComponentUtilities {
	
	private static final ResourceTimestampMappings ContextRootMapping = new ResourceTimestampMappings();

	/**
	 * Ensure the container is not read-only.
	 * <p>
	 * For Linux, a Resource cannot be created in a ReadOnly folder. This is only necessary for new
	 * files.
	 * 
	 * @param resource
	 *            workspace resource to make read/write
	 * @plannedfor 1.0.0
	 */
	public static void ensureContainerNotReadOnly(IResource resource) {
		if (resource != null && !resource.exists()) { // it must be new
			IContainer container = resource.getParent();
			if (container != null) {
				ResourceAttributes attr = container.getResourceAttributes();
				if (!attr.isReadOnly())
					container = container.getParent();
				attr.setReadOnly(false);
			}
		}
	}

	public static IFolder createFolderInComponent(IVirtualComponent component, String folderName) throws CoreException {
		if (folderName != null) {
			IVirtualFolder rootfolder = component.getRootFolder();
			IFolder folder = ResourcesPlugin.getWorkspace().getRoot().getFolder(new Path(rootfolder.getProject().getName()).append(folderName));
			if (!folder.exists()) {
				ProjectUtilities.ensureContainerNotReadOnly(folder);
				folder.create(true, true, null);
			}
			return folder;
		}
		return null;
	}


	public static ArtifactEdit getArtifactEditForRead(IVirtualComponent comp) {
		if (comp != null) {
			ArtifactEditRegistryReader reader = ArtifactEditRegistryReader.instance();
			IArtifactEditFactory factory = reader.getArtifactEdit(comp.getProject());
			if (factory != null)
				return factory.createArtifactEditForRead(comp);
		}
		return null;
	}

	public static ArtifactEdit getArtifactEditForRead(IVirtualComponent comp, String type) {
		if (comp != null) {
			ArtifactEditRegistryReader reader = ArtifactEditRegistryReader.instance();
			IArtifactEditFactory factory = reader.getArtifactEdit(type);
			if (factory != null)
				return factory.createArtifactEditForRead(comp);
		}
		return null;
	}


	public static IFile findFile(IVirtualComponent comp, IPath aPath) throws CoreException {
		if (comp == null || aPath == null)
			return null;
		IVirtualFolder root = comp.getRootFolder();
		IVirtualResource file = root.findMember(aPath);
		if (file != null)
			return (IFile) file.getUnderlyingResource();
		return null;
	}

	public static IVirtualComponent findComponent(IResource res) {

		return (IVirtualComponent)res.getAdapter(IVirtualComponent.class);
	}
	
	/**
	 * **********************Please read java doc before using this api*******************
	 * This is a very expensive api from a performance point as it does a structure edit
	 * access and release for each component in the workspace. Use this api very sparingly
	 * and if used cached the information returned by this api for further processing
	 * @return - A an array of all virtual components in the workspace
	 * ***********************************************************************************
	 */

	public static IVirtualComponent[] getAllWorkbenchComponents() {
		List components = new ArrayList();
		List projects = Arrays.asList(ResourcesPlugin.getWorkspace().getRoot().getProjects());
		for (int i = 0; i < projects.size(); i++) {
			if( ModuleCoreNature.isFlexibleProject((IProject)projects.get(i))){
				IVirtualComponent wbComp = ComponentCore.createComponent((IProject)projects.get(i));
				components.add(wbComp);
			}
		}
		VirtualComponent[] temp = (VirtualComponent[]) components.toArray(new VirtualComponent[components.size()]);
		return temp;
	}
	
	/**
	 * **********************Please read java doc before using this api*******************
	 * This is a very expensive api from a performance point as it does a structure edit
	 * access and release for each component in the workspace. Use this api very sparingly
	 * and if used cached the information returned by this api for further processing.
	 * 
	 * @return - A virtual component in the workspace
	 * ***********************************************************************************
	 */
	public static IVirtualComponent getComponent(String componentName) {
		IVirtualComponent[] allComponents = getAllWorkbenchComponents();
		for (int i = 0; i < allComponents.length; i++) {
			if (allComponents[i].getName().equals(componentName))
				return allComponents[i];
		}
		return null;
	}


	public static ArtifactEdit getArtifactEditForWrite(IVirtualComponent comp) {
		if (comp != null) {
			ArtifactEditRegistryReader reader = ArtifactEditRegistryReader.instance();
			IArtifactEditFactory factory = reader.getArtifactEdit(comp.getProject());
			if (factory != null)
				return factory.createArtifactEditForWrite(comp);
		}
		return null;
	}

	public static IVirtualComponent findComponent(EObject anObject) {
		Resource res = anObject.eResource();
		return findComponent(res);
	}

	public static IVirtualComponent findComponent(Resource aResource) {
		IFile file = WorkbenchResourceHelper.getFile(aResource);
		if (file == null)
			return null;
		return (IVirtualComponent)file.getAdapter(IVirtualComponent.class);
	}

//	public static JavaProjectMigrationOperation createFlexJavaProjectForProjectOperation(IProject project) {
//		IDataModel model = DataModelFactory.createDataModel(new JavaProjectMigrationDataModelProvider());
//		model.setProperty(IJavaProjectMigrationDataModelProperties.PROJECT_NAME, project.getName());
//		return new JavaProjectMigrationOperation(model);
//	}

	public static CreateReferenceComponentsOp createReferenceComponentOperation(IVirtualComponent sourceComponent, List targetComponentProjects) {
		IDataModel model = DataModelFactory.createDataModel(new CreateReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT, sourceComponent);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST);
		modHandlesList.addAll(targetComponentProjects);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST, modHandlesList);
		
		return new CreateReferenceComponentsOp(model);
	}
	
	public static CreateReferenceComponentsOp createWLPReferenceComponentOperation(IVirtualComponent sourceComponent, List targetComponentProjects) {
		IDataModel model = DataModelFactory.createDataModel(new CreateReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT, sourceComponent);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST);
		modHandlesList.addAll(targetComponentProjects);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST, modHandlesList);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_DEPLOY_PATH,"/WEB-INF/lib"); //$NON-NLS-1$
		return new CreateReferenceComponentsOp(model);
	}

	public static RemoveReferenceComponentOperation removeWLPReferenceComponentOperation(IVirtualComponent sourceComponent, List targetComponentProjects) {
		IDataModel model = DataModelFactory.createDataModel(new RemoveReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT, sourceComponent);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST);
		modHandlesList.addAll(targetComponentProjects);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST, modHandlesList);
		
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_DEPLOY_PATH,"/WEB-INF/lib"); //$NON-NLS-1$
		
		return new RemoveReferenceComponentOperation(model);

	}
	
	public static RemoveReferenceComponentOperation removeReferenceComponentOperation(IVirtualComponent sourceComponent, List targetComponentProjects) {
		IDataModel model = DataModelFactory.createDataModel(new RemoveReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT, sourceComponent);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST);
		modHandlesList.addAll(targetComponentProjects);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST, modHandlesList);
		return new RemoveReferenceComponentOperation(model);

	}
	
	public static IVirtualComponent[] getComponents(IProject[] projects) {
		List result = new ArrayList();
		if (projects!=null) {
			for (int i=0; i<projects.length; i++) {
				if (projects[i] != null) {
					IVirtualComponent comp = ComponentCore.createComponent(projects[i]);
					if (comp != null && comp.exists())
						result.add(comp);
				}
			}
		}
		return (IVirtualComponent[]) result.toArray(new IVirtualComponent[result.size()]);
	}
	
	/**
	 * This method will retrieve the context root for the associated workbench module which is used
	 * by the server at runtime.  This method is not yet completed as the context root has to be
	 * abstracted and added to the workbenchModule model.  This API will not change though.
	 * Returns null for now.
	 * 
	 * @return String value of the context root for runtime of the associated module
	 */
	public static String getServerContextRoot(IProject project) {		
		
		if(!ContextRootMapping.hasChanged(project)) {
			/*Simply return the cached data*/
			String data = null;
			if(!ContextRootMapping.hasCacheError(project) && ContextRootMapping.hasCacheData(project))
				data = (String) ContextRootMapping.getData(project);
			return data;
		}
		
		StructureEdit moduleCore = null;
		WorkbenchComponent wbComponent = null;
		try {
			moduleCore = StructureEdit.getStructureEditForRead(project);
			if (moduleCore == null || moduleCore.getComponent() == null) {
				ContextRootMapping.markError(project);
				return null;
			}
			wbComponent = moduleCore.getComponent();
		} finally {
			if (moduleCore != null) {
				moduleCore.dispose();
			}
		}
		List existingProps = wbComponent.getProperties();
		for (int i = 0; i < existingProps.size(); i++) {
			Property prop = (Property) existingProps.get(i);
			if(prop.getName().equals(IModuleConstants.CONTEXTROOT)){
				ContextRootMapping.mark(project, prop.getValue());
				return prop.getValue();
			}
		}		
		ContextRootMapping.markError(project);
		// If all else fails...
		return null;
	}
	
	/**
	 * This method will set the context root on the associated workbench module with the given string
	 * value passed in.  This context root is used by the server at runtime.  This method is not yet
	 * completed as the context root still needs to be abstracted and added to the workbench module
	 * model.  This API will not change though.
	 * Does nothing as of now.
	 * 
	 * @param contextRoot string
	 */
	public static void setServerContextRoot(IProject project, String contextRoot) {
		IVirtualComponent comp = ComponentCore.createComponent(project);
		comp.setMetaProperty(IModuleConstants.CONTEXTROOT, contextRoot);
	}

	public static String getDeployUriOfUtilComponent(IVirtualReference reference){
		String archiveName = reference.getArchiveName();
		String uri = null;
		if( archiveName != null && archiveName != "" ){ //$NON-NLS-1$
			uri = reference.getRuntimePath() + "/" + reference.getArchiveName(); //$NON-NLS-1$
		}else{
			uri = reference.getRuntimePath() + "/" + reference.getReferencedComponent().getProject().getName() + ".jar"; //$NON-NLS-1$ //$NON-NLS-2$
		}
		return uri;
	}
}