package org.gcube.contentmanagement.blobstorage.service.impl;

import java.net.UnknownHostException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.gcube.contentmanagement.blobstorage.resource.MyFile;
import org.gcube.contentmanagement.blobstorage.service.directoryOperation.BucketCoding;
import org.gcube.contentmanagement.blobstorage.service.directoryOperation.DirectoryBucket;
import org.gcube.contentmanagement.blobstorage.service.directoryOperation.DirectoryEntity;
import org.gcube.contentmanagement.blobstorage.service.operation.OperationManager;
import org.gcube.contentmanagement.blobstorage.transport.TransportManager;
import org.gcube.contentmanagement.blobstorage.transport.TransportManagerFactory;
import org.gcube.contentmanagement.blobstorage.transport.backend.RemoteBackendException;
import org.gcube.contentmanagement.blobstorage.transport.backend.util.Costants;
import org.gcube.contentmanagement.blobstorage.resource.OperationDefinition.REMOTE_RESOURCE;
import org.gcube.contentmanagement.blobstorage.resource.StorageObject;


/**
 * Defines the operations for selecting a remote resource.
 * ex. a remote path for a download operation. 
 * This selection is made for all types of operation 
 *   
 * @author Roberto Cirillo (ISTI - CNR)
 *
 */
public class RemoteResource extends Resource{
	
	TransportManager tm;

	public RemoteResource(MyFile file, ServiceEngine engine) {
		super(file, engine);
		logger.info("file gCube parameter costructor: "+file.getGcubeAccessType()+" "+file.getGcubeScope());
	}

/**
 * identify a remote resource by path (a file or a directory) 
 * @param path the remote path
 * @return remote resource id
 * @throws RemoteBackendException if there are runtime exception from the remote backend
 */
	public String RFile(String path) throws RemoteBackendException{
		return RFile(path, false);
	}

	
	/**
	 * identify a remote resource by path (a file or a directory) 
	 * @param path the remote path
	 * @return remote resource id
	 * @throws RemoteBackendException if there are runtime exception from the remote backend
	 */
		public String RFile(String path, boolean backendTypeReturned) throws RemoteBackendException{
			logger.info("file gCube parameter before: "+file.getGcubeAccessType()+" "+file.getGcubeScope());
			file = setGenericProperties(engine.getContext(), engine.owner, path, "remote");
			file.setRemotePath(path);
			file.setOwner(engine.owner);
			getMyFile().setRemoteResource(REMOTE_RESOURCE.PATH);
			setMyFile(file);
			engine.service.setResource(getMyFile());
			Object obj=getRemoteObject(getMyFile(),engine.primaryBackend,engine.volatileBackend);
			String id=null;
			if(obj!=null)
				id=obj.toString();
			if (backendTypeReturned&& (id!=null))
				return id+BACKEND_STRING_SEPARATOR+engine.getBackendType();
			return id;
		}

	
/**
 * identify a remote resource by object id
 * @param id that identifies a remote resource
 * @return remote resource id
 * @throws RemoteBackendException if there are runtime exception from the remote backend 
 */

	public String RFileById(String id) throws RemoteBackendException{
		return RFileById(id, false);
	}

	
	/**
	 * identify a remote resource by object id
	 * @param id that identifies a remote resource
	 * @return remote resource id
	 * @throws RemoteBackendException if there are runtime exception from the remote backend 
	 */
		
	public String RFileById(String id, boolean backendTypeReturned) throws RemoteBackendException{
			getMyFile().setRemoteResource(REMOTE_RESOURCE.ID);
			Object obj = executeOperation(id);
			String idReturned=null;
			if(obj!=null)
				idReturned=obj.toString();
			if (backendTypeReturned && idReturned != null)
				return idReturned+BACKEND_STRING_SEPARATOR+engine.getBackendType();
			return idReturned;
		}

	
	
/**
 * Identify a remote folder by path
 * @param dir dir remote path
 * @return list of object contained in the remote dir
 */
   public List<StorageObject> RDir(String dir){
	  getMyFile().setRemoteResource(REMOTE_RESOURCE.DIR);
	  getMyFile().setOwner(engine.owner);
	  if(engine.getCurrentOperation().equalsIgnoreCase("showdir")){
		  dir = new BucketCoding().bucketDirCoding(dir, engine.getContext());
		  TransportManagerFactory tmf= new TransportManagerFactory(engine.primaryBackend, engine.getBackendUser(), engine.getBackendPassword());
		  tm=tmf.getTransport(tm, engine.getBackendType(), engine.getGcubeMemoryType(), engine.getDbNames(), engine.getWriteConcern(), engine.getReadConcern());
		  Map<String, StorageObject> mapDirs=null;
		  try {
		    	mapDirs = tm.getValues(getMyFile(), dir, DirectoryEntity.class);
		  } catch (RemoteBackendException e) {
			e.printStackTrace();
		  }
		  List<StorageObject> dirs=null;
		  if(mapDirs!=null){
			 dirs = engine.addObjectsDirBucket(mapDirs);
	      }
		  if(dirs==null)
			dirs=Collections.emptyList();
		  return dirs;
	  }else if(engine.getCurrentOperation().equalsIgnoreCase("removedir")){
			if((dir != null) && (engine.owner != null)){
				DirectoryBucket dirBuc=new DirectoryBucket(engine.primaryBackend, engine.getBackendUser(), engine.getBackendPassword(), dir, engine.owner);
				if(!Costants.CLIENT_TYPE.equalsIgnoreCase("mongo"))
					dirBuc.removeDirBucket(getMyFile(), dir, engine.getContext(), engine.getBackendType(), engine.getDbNames());
				else{
					TransportManagerFactory tmf=new TransportManagerFactory(engine.primaryBackend, engine.getBackendUser(), engine.getBackendPassword());
					tm=tmf.getTransport(tm, Costants.CLIENT_TYPE, engine.getGcubeMemoryType(), engine.getDbNames(), engine.getWriteConcern(), engine.getReadConcern());
					dir=new BucketCoding().bucketFileCoding(dir, engine.getContext());
					try {
						tm.removeDir(dir, getMyFile());
					} catch (UnknownHostException e) {
						throw new RemoteBackendException(e.getMessage());
					}
					
				}
			}else{
				logger.error("REMOVE Operation not valid:\n\t specify a valid bucketID or an author and a path on the cluster ");
	   	    }
		    return null;

	 }else{
		throw new IllegalArgumentException("The method RDir is not applicable for the operation selected");
	 }
  }
   
}