package org.eclipse.jst.common.componentcore.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.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jem.util.emf.workbench.ProjectUtilities;
import org.eclipse.jem.util.emf.workbench.WorkbenchResourceHelperBase;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.eclipse.jst.common.jdt.internal.integration.IJavaProjectMigrationDataModelProperties;
import org.eclipse.jst.common.jdt.internal.integration.JavaProjectMigrationDataModelProvider;
import org.eclipse.jst.common.jdt.internal.integration.JavaProjectMigrationOperation;
import org.eclipse.wst.common.componentcore.ArtifactEdit;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.UnresolveableURIException;
import org.eclipse.wst.common.componentcore.datamodel.properties.ICreateReferenceComponentsDataModelProperties;
import org.eclipse.wst.common.componentcore.internal.ComponentResource;
import org.eclipse.wst.common.componentcore.internal.StructureEdit;
import org.eclipse.wst.common.componentcore.internal.WorkbenchComponent;
import org.eclipse.wst.common.componentcore.internal.impl.ModuleURIUtil;
import org.eclipse.wst.common.componentcore.internal.impl.ResourceTreeNode;
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.VirtualComponent;
import org.eclipse.wst.common.componentcore.internal.util.ArtifactEditRegistryReader;
import org.eclipse.wst.common.componentcore.internal.util.IArtifactEditFactory;
import org.eclipse.wst.common.componentcore.internal.util.IModuleConstants;
import org.eclipse.wst.common.componentcore.resources.ComponentHandle;
import org.eclipse.wst.common.componentcore.resources.IFlexibleProject;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualContainer;
import org.eclipse.wst.common.componentcore.resources.IVirtualFolder;
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 {

	public static String JAVA_NATURE = "org.eclipse.jdt.core.javanature";

	/**
	 * Retrieve all the source containers for a given virtual workbench component
	 * 
	 * @param wc
	 * @return the array of IPackageFragmentRoots
	 */
	public static IPackageFragmentRoot[] getSourceContainers(IVirtualComponent vc) {
		List list = new ArrayList();
		IProject project = vc.getProject();
		IJavaProject jProject = JavaCore.create(project);
		IPackageFragmentRoot[] roots;
		try {
			roots = jProject.getPackageFragmentRoots();
			for (int i = 0; i < roots.length; i++) {
				IResource resource = roots[i].getResource();
				if (null != resource) {
					IVirtualResource[] vResources = ComponentCore.createResources(resource);
					boolean found = false;
					for (int j = 0; !found && j < vResources.length; j++) {
						if (vResources[j].getComponent().equals(vc)) {
							list.add(roots[i]);
							found = true;
						}
					}
				}
			}
		} catch (JavaModelException e) {
			Logger.getLogger().logError(e);
		}

		return (IPackageFragmentRoot[]) list.toArray(new IPackageFragmentRoot[list.size()]);
	}

	/**
	 * 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) {
		ArtifactEditRegistryReader reader = ArtifactEditRegistryReader.instance();
		if (comp != null) {
			IArtifactEditFactory factory = reader.getArtifactEdit(comp.getComponentTypeId());
			return factory.createArtifactEditForRead(comp);
		}
		return null;
	}


	public static IFile findFile(IVirtualComponent comp, IPath aPath) throws CoreException {
		// IVirtualResource[] members = comp.members();
		IVirtualResource[] members = comp.getRootFolder().members();
		for (int i = 0; i < members.length; i++) {
			IVirtualResource resource = members[i];
			if (resource.getType() == IVirtualResource.FOLDER) {
				IVirtualResource file = ((IVirtualContainer) resource).findMember(aPath);
				if (file != null)
					return (IFile) file.getUnderlyingResource();
			}
		}
		return null;
	}

	private static IVirtualComponent findComponent(IProject project, Resource res) {

		StructureEdit moduleCore = null;
		WorkbenchComponent module = null;
		try {
			moduleCore = StructureEdit.getStructureEditForRead(project);
			URI uri = WorkbenchResourceHelperBase.getNonPlatformURI(res.getURI());
			IPath projPath = WorkbenchResourceHelper.getPathInProject(project, new Path(uri.path()));
			ComponentResource[] resources = moduleCore.findResourcesBySourcePath(projPath, ResourceTreeNode.CREATE_RESOURCE_ALWAYS);
			for (int i = 0; i < resources.length; i++) {
				module = resources[i].getComponent();
				if (module != null)
					break;
			}
		} catch (UnresolveableURIException e) {
			// Ignore
		} finally {
			if (moduleCore != null)
				moduleCore.dispose();
		}
		if (module == null)
			return null;
		else
			return ComponentCore.createComponent(project, module.getName());
	}

	public static IVirtualComponent findComponent(IProject project, IResource res) {

		StructureEdit moduleCore = null;
		WorkbenchComponent module = null;
		try {
			moduleCore = StructureEdit.getStructureEditForRead(project);
			ComponentResource[] resources = moduleCore.findResourcesBySourcePath(res.getFullPath());
			for (int i = 0; i < resources.length; i++) {
				module = resources[i].getComponent();
				if (module != null)
					break;
			}
		} catch (UnresolveableURIException e) {
			// Ignore
		} finally {
			if (moduleCore != null)
				moduleCore.dispose();
		}
		return ComponentCore.createComponent(project, module.getName());
	}
	
	/**
	 * **********************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++) {
			IFlexibleProject flexProject = ComponentCore.createFlexibleProject((IProject) projects.get(i));
			IVirtualComponent[] wbComp = flexProject.getComponents();
			for (int j = 0; j < wbComp.length; j++) {
				components.add(ComponentCore.createComponent((IProject) projects.get(i), wbComp[j].getName()));
			}
		}
		VirtualComponent[] temp = (VirtualComponent[]) components.toArray(new VirtualComponent[components.size()]);
		return temp;
	}

	public static IVirtualComponent[] getComponentsForProject(IProject project) {
		IFlexibleProject flexProject = ComponentCore.createFlexibleProject(project);
		return flexProject.getComponents();
	}
	
	/**
	 * **********************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();
		List matchingComponents = new ArrayList();
		for (int i = 0; i < allComponents.length; i++) {
			if (allComponents[i].getName().equals(componentName)) {
				matchingComponents.add(allComponents[i]);
			}
		}
		VirtualComponent[] temp = (VirtualComponent[]) matchingComponents.toArray(new VirtualComponent[matchingComponents.size()]);
		return temp;
	}


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

	public static IVirtualComponent findComponent(EObject anObject) {
		IProject project = ProjectUtilities.getProject(anObject);
		Resource res = anObject.eResource();
		return findComponent(project, res);
	}

	public static IVirtualComponent findComponent(Resource aResource) {
		IProject project = ProjectUtilities.getProject(aResource);
		return findComponent(project, aResource);
	}

	public static List getAllJavaNonFlexProjects() throws CoreException {
		List nonFlexJavaProjects = new ArrayList();
		IProject[] projects = ResourcesPlugin.getWorkspace().getRoot().getProjects();
		for (int i = 0; i < projects.length; i++) {
			if (projects[i].hasNature(JAVA_NATURE) && !projects[i].hasNature(IModuleConstants.MODULE_NATURE_ID)) {
				nonFlexJavaProjects.add(projects[i]);
			}
		}
		return nonFlexJavaProjects;
	}

	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(ComponentHandle sourceComponentHandle, List targetComponentsHandles) {
		IDataModel model = DataModelFactory.createDataModel(new CreateReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT_HANDLE, sourceComponentHandle);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_HANDLE_LIST);
		modHandlesList.addAll(targetComponentsHandles);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_HANDLE_LIST, modHandlesList);
		
		return new CreateReferenceComponentsOp(model);
	}
	
	public static CreateReferenceComponentsOp createWLPReferenceComponentOperation(ComponentHandle sourceComponentHandle, List targetComponentsHandles) {
		IDataModel model = DataModelFactory.createDataModel(new CreateReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT_HANDLE, sourceComponentHandle);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_HANDLE_LIST);
		modHandlesList.addAll(targetComponentsHandles);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_HANDLE_LIST, modHandlesList);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_DEPLOY_PATH,"/WEB-INF/lib");
		return new CreateReferenceComponentsOp(model);
	}

	public static RemoveReferenceComponentOperation removeReferenceComponentOperation(ComponentHandle sourceComponentHandle, List targetComponentsHandles) {
		IDataModel model = DataModelFactory.createDataModel(new RemoveReferenceComponentsDataModelProvider());
		model.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT_HANDLE, sourceComponentHandle);
		List modHandlesList = (List) model.getProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_HANDLE_LIST);
		modHandlesList.addAll(targetComponentsHandles);
		model.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENTS_HANDLE_LIST, modHandlesList);
		return new RemoveReferenceComponentOperation(model);

	}

	/**
	 * 
	 * @param name
	 * @return
	 * @description the passed name should have either lib or var as its first segment e.g.
	 *              lib/D:/foo/foo.jar or var/<CLASSPATHVAR>/foo.jar
	 */
	public static IPath getResolvedPathForArchiveComponent(String name) {

		URI uri = URI.createURI(name);

		String resourceType = uri.segment(0);
		URI contenturi = ModuleURIUtil.trimToRelativePath(uri, 1);
		String contentName = contenturi.toString();

		if (resourceType.equals("lib")) {
			// module:/classpath/lib/D:/foo/foo.jar
			return Path.fromOSString(contentName);

		} else if (resourceType.equals("var")) {

			// module:/classpath/var/<CLASSPATHVAR>/foo.jar
			String classpathVar = contenturi.segment(0);
			URI remainingPathuri = ModuleURIUtil.trimToRelativePath(contenturi, 1);
			String remainingPath = remainingPathuri.toString();

			String[] classpathvars = JavaCore.getClasspathVariableNames();
			boolean found = false;
			for (int i = 0; i < classpathvars.length; i++) {
				if (classpathVar.equals(classpathvars[i])) {
					found = true;
					break;
				}
			}
			if (found) {
				IPath path = JavaCore.getClasspathVariable(classpathVar);
				URI finaluri = URI.createURI(path.toOSString() + IPath.SEPARATOR + remainingPath);
				return Path.fromOSString(finaluri.toString());
			}
		}
		return null;
	}

	public static IVirtualComponent[] getAllComponentsInWorkspaceOfType(String type) {
		List result = new ArrayList();
		IProject[] projects = ResourcesPlugin.getWorkspace().getRoot().getProjects();
		for (int i = 0; i < projects.length; i++) {
			IFlexibleProject project = ComponentCore.createFlexibleProject(projects[i]);
			result.addAll(Arrays.asList(project.getComponentsOfType(type)));
		}
		return (IVirtualComponent[]) result.toArray(new IVirtualComponent[result.size()]);
	}

}