package org.eclipse.jst.common.componentcore.util;

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

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
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.wst.common.componentcore.ArtifactEdit;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.UnresolveableURIException;
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.util.ArtifactEditRegistryReader;
import org.eclipse.wst.common.componentcore.internal.util.IArtifactEditFactory;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualFolder;
import org.eclipse.wst.common.componentcore.resources.IVirtualResource;

public class ComponentUtilities {

	public static IPackageFragmentRoot[] getSourceContainers(IVirtualComponent wc) {
		 List sourceFolders = new ArrayList();
		 try {
		 IVirtualResource[] resources = wc.members();
		 if(resources != null || resources.length > 0) {
			 for(int i = 0; i < resources.length; i++) {
				 if(resources[i].getType() == IVirtualResource.FOLDER) {
				 IFolder folder = ((IVirtualFolder)resources[i]).getUnderlyingFolder();
				 IJavaElement element = JavaCore.create(folder);
				 if(element != null && element.getElementType() == IJavaElement.PACKAGE_FRAGMENT_ROOT)
				    sourceFolders.add(element);
				 }
			 }
		   }
		 } catch (CoreException ce) {
		 Logger.getLogger().log(ce);
		 }
		 return (IPackageFragmentRoot[]) sourceFolders.toArray(new IPackageFragmentRoot[sourceFolders.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
	 * @since 1.0.0
	 */
	public static void ensureContainerNotReadOnly(IResource resource) {
		if (resource != null && !resource.exists()) { //it must be new
			IContainer container = resource.getParent();
			while (container != null && !container.isReadOnly())
				container = container.getParent();
			if (container != null)
				container.setReadOnly(false);
		}
	}

	public static IFolder createFolderInComponent(IVirtualComponent component, String folderName) throws CoreException {
		if (folderName != null) {
			IFolder folder = ResourcesPlugin.getWorkspace().getRoot().getFolder(component.getProjectRelativePath().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();
		IArtifactEditFactory factory = reader.getArtifactEdit(comp.getComponentTypeId());
		return factory.createArtifactEditForRead(comp);
	}


	public static IVirtualComponent findComponent(EObject anObject) {
	WorkbenchComponent module = null;
		IProject project = ProjectUtilities.getProject(anObject);
		StructureEdit moduleCore = null;
		try {
			moduleCore = StructureEdit.getStructureEditForRead(project);
			URI uri = WorkbenchResourceHelperBase.getNonPlatformURI(anObject.eResource().getURI());
			ComponentResource[] resources = moduleCore.findResourcesBySourcePath(uri);
			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 ArtifactEdit getArtifactEditForWrite(IVirtualComponent comp) {
		ArtifactEditRegistryReader reader = ArtifactEditRegistryReader.instance();
		IArtifactEditFactory factory = reader.getArtifactEdit(comp.getComponentTypeId());
		return factory.createArtifactEditForWrite(comp);
	}

}