package org.gcube.informationsystem.resourceregistry.instances.context;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import org.gcube.common.scope.impl.ScopeBean;
import org.gcube.context.ContextElaborator;
import org.gcube.informationsystem.context.impl.entities.ContextImpl;
import org.gcube.informationsystem.context.reference.entities.Context;
import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.context.ContextException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.context.ContextNotFoundException;
import org.gcube.informationsystem.resourceregistry.instances.context.ContextUtility;
import org.gcube.informationsystem.resourceregistry.instances.context.entities.ContextManagement;
import org.gcube.informationsystem.utils.ISMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ContextCreator extends ContextElaborator {
	
	private static Logger logger = LoggerFactory.getLogger(ContextCreator.class);
	
	protected Map<String, UUID> contexts;
	protected ContextManagement contextManagement;
	
	public ContextCreator() {
		super();
		contexts = new HashMap<>();
		contextManagement = new ContextManagement();
	}
	
	protected Context create(Context context) throws ResourceRegistryException, IOException {
		ContextManagement contextManagement = new ContextManagement();
		contextManagement.setJson(ISMapper.marshal(context));
		String contextString = contextManagement.create();
		logger.info("Created {}", contextString);
		Context c = ISMapper.unmarshal(Context.class, contextString);
		return c;
	}
	
	protected UUID getContextUUID(ScopeBean scopeBean) throws ResourceRegistryException, IOException {
		if(scopeBean!=null) {
			try {
				UUID uuid = contexts.get(scopeBean.toString());
				if(uuid==null) {
					uuid = ContextUtility.getInstance().getContextUUIDFromFullName(scopeBean.toString());
					if(uuid!=null) {
						contexts.put(scopeBean.toString(), uuid);
					}
				}
				return uuid;
			}catch (ContextException e) {
				logger.info("{} does not exists", scopeBean);
			}
		}
		return null;
	}
	
	
	@Override
	protected void elaborateContext(ScopeBean scopeBean) throws Exception {
		UUID uuid = null; 
		try {
			uuid = getContextUUID(scopeBean);
		}catch (ContextNotFoundException e) {
			// The context has to be created
			logger.info("{} not found", scopeBean.toString());
		}
		if(uuid==null) {
			logger.info("Parent Context of {} is {}", scopeBean, scopeBean.enclosingScope());
			UUID parentUUID = getContextUUID(scopeBean.enclosingScope()); 
			Context context = new ContextImpl(scopeBean.name());
			if(parentUUID!=null) {
				context.setParent(parentUUID);
			}
			context = create(context);
			contexts.put(scopeBean.toString(), context.getHeader().getUUID());
		}else {
			logger.info("Context {} is already present with UUID {}", scopeBean, uuid.toString());
		}
	}
	
}