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.IJavaElement;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
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 wc) {
		List sourceFolders = new ArrayList();
		try {
			IVirtualFolder rootFolder = wc.getRootFolder();
			IVirtualResource[] resources = rootFolder.members();
			//recursively collect the source folders from the top level component folders
			addSourceContainers(sourceFolders,resources);
		} catch (CoreException ce) {
			Logger.getLogger().log(ce);
		}
		return (IPackageFragmentRoot[]) sourceFolders.toArray(new IPackageFragmentRoot[sourceFolders.size()]);
	}
	
	private static void addSourceContainers(List sourceFolders, IVirtualResource[] resources) {
		if (resources != null || resources.length > 0) {
			for (int i = 0; i < resources.length; i++) {
				IVirtualResource resource = resources[i];
				// if the virtual resource is of type folder, check to see if it is source folder
				if (resource.getType() == IVirtualResource.FOLDER) {
					IVirtualResource[] childResources = null;
					try {
						childResources = ((IVirtualFolder) resource).members();
					} catch (CoreException ce) {
						Logger.getLogger().log(ce);
					} 
					IFolder folder = ((IVirtualFolder) resource).getUnderlyingFolder();
					IJavaElement element = JavaCore.create(folder);
					// if it is a java package fragment add it to the result
					if (element != null && element.getElementType() == IJavaElement.PACKAGE_FRAGMENT_ROOT)
						sourceFolders.add(element);
					// otherwise recursively check that folders child folders
					else if (childResources.length>0)
						addSourceContainers(sourceFolders,childResources);
				}
			}
		}
	}

	/**
	 * 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
	 * @since 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());
    }
	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();
	}

	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 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()]);
	}
	
}