package org.argeo.cms.internal.kernel;
   
   import java.io.IOException;
   import java.net.URI;
   import java.nio.file.FileSystem;
   import java.nio.file.FileSystemAlreadyExistsException;
   import java.nio.file.Path;
   import java.util.HashMap;
   import java.util.Map;
  
  import javax.jcr.Node;
  import javax.jcr.Property;
  import javax.jcr.Repository;
  import javax.jcr.RepositoryException;
  import javax.jcr.RepositoryFactory;
  import javax.jcr.Session;
  import javax.jcr.nodetype.NodeType;
  
  import org.argeo.api.NodeConstants;
  import org.argeo.api.NodeUtils;
  import org.argeo.cms.CmsException;
  import org.argeo.cms.auth.CurrentUser;
  import org.argeo.jackrabbit.fs.AbstractJackrabbitFsProvider;
  import org.argeo.jcr.fs.JcrFileSystem;
  import org.argeo.jcr.fs.JcrFileSystemProvider;
  import org.argeo.jcr.fs.JcrFsException;
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.FrameworkUtil;
  
  public class CmsFsProvider extends AbstractJackrabbitFsProvider {
  	private Map<String, CmsFileSystem> fileSystems = new HashMap<>();
  
  	@Override
  	public String getScheme() {
  		return NodeConstants.SCHEME_NODE;
  	}
  
  	@Override
  	public FileSystem newFileSystem(URI uri, Map<String, ?> env) throws IOException {
  		BundleContext bc = FrameworkUtil.getBundle(CmsFsProvider.class).getBundleContext();
  		String username = CurrentUser.getUsername();
  		if (username == null) {
  			// TODO deal with anonymous
  			return null;
  		}
  		if (fileSystems.containsKey(username))
  			throw new FileSystemAlreadyExistsException("CMS file system already exists for user " + username);
  
  		try {
  			String host = uri.getHost();
  			if (host != null && !host.trim().equals("")) {
  				URI repoUri = new URI("http", uri.getUserInfo(), uri.getHost(), uri.getPort(), "/jcr/node", null, null);
  				RepositoryFactory repositoryFactory = bc.getService(bc.getServiceReference(RepositoryFactory.class));
  				Repository repository = NodeUtils.getRepositoryByUri(repositoryFactory, repoUri.toString());
  //				Session session = repository.login("main");
  				CmsFileSystem fileSystem = new CmsFileSystem(this, repository);
  				fileSystems.put(username, fileSystem);
  				return fileSystem;
  			} else {
  				Repository repository = bc.getService(
  						bc.getServiceReferences(Repository.class, "(cn=" + NodeConstants.EGO_REPOSITORY + ")").iterator().next());
  //				Session session = repository.login();
  				CmsFileSystem fileSystem = new CmsFileSystem(this, repository);
  				fileSystems.put(username, fileSystem);
  				return fileSystem;
  			}
  		} catch (Exception e) {
  			throw new CmsException("Cannot open file system " + uri + " for user " + username, e);
  		}
  	}
  
  	@Override
  	public FileSystem getFileSystem(URI uri) {
  		return currentUserFileSystem();
  	}
  
  	@Override
  	public Path getPath(URI uri) {
  		JcrFileSystem fileSystem = currentUserFileSystem();
  		String path = uri.getPath();
  		if (fileSystem == null)
  			try {
  				fileSystem = (JcrFileSystem) newFileSystem(uri, new HashMap<String, Object>());
  			} catch (IOException e) {
  				throw new JcrFsException("Could not autocreate file system", e);
  			}
  		return fileSystem.getPath(path);
  	}
  
  	protected JcrFileSystem currentUserFileSystem() {
  		String username = CurrentUser.getUsername();
  		return fileSystems.get(username);
  	}
  
  	public Node getUserHome(Repository repository) {
  		try {
  			Session session = repository.login(NodeConstants.HOME_WORKSPACE);
  			return NodeUtils.getUserHome(session);
  		} catch (RepositoryException e) {
 			throw new IllegalStateException("Cannot get user home", e);
 		}
 	}
 
 	static class CmsFileSystem extends JcrFileSystem {
 		public CmsFileSystem(JcrFileSystemProvider provider, Repository repository) throws IOException {
 			super(provider, repository);
 		}
 
 		public boolean skipNode(Node node) throws RepositoryException {
 //			if (node.isNodeType(NodeType.NT_HIERARCHY_NODE) || node.isNodeType(NodeTypes.NODE_USER_HOME)
 //					|| node.isNodeType(NodeTypes.NODE_GROUP_HOME))
 			if (node.isNodeType(NodeType.NT_HIERARCHY_NODE))
 				return false;
 			// FIXME Better identifies home
 			if (node.hasProperty(Property.JCR_ID))
 				return false;
 			return true;
 		}
 
 	}
 }