package org.gcube.vremanagement.contextmanager;

import java.util.List;

import javax.enterprise.inject.Any;
import javax.enterprise.inject.Instance;
import javax.inject.Inject;
import javax.inject.Singleton;

import org.gcube.vremanagement.contextmanager.exceptions.ContextAlreadyExistsException;
import org.gcube.vremanagement.contextmanager.handlers.ContextContainer;
import org.gcube.vremanagement.contextmanager.model.exceptions.InvalidContextException;
import org.gcube.vremanagement.contextmanager.model.operators.context.CustomContextOperator;
import org.gcube.vremanagement.contextmanager.model.operators.context.MandatoryContextOperator;
import org.gcube.vremanagement.contextmanager.model.types.Context;
import org.gcube.vremanagement.contextmanager.model.types.Context.Type;
import org.slf4j.Logger;


@Singleton
public class ContextManager {
	
	@Inject Logger log;
	
	@Inject
	@Any
	private Instance<MandatoryContextOperator> mandatoryContextOperators;
	
	@Inject
	@Any
	private Instance<CustomContextOperator> customContextOperators;
	
	@Inject
	private ContextContainer contextContainer;
	
	public void createContext(String parentContextId, String vreName, List<String> resourcesIds) throws InvalidContextException {
		Context parentContext = contextContainer.getContextById(parentContextId);
		
		Context newContext = new Context(parentContext, vreName, vreName, Type.VRE);
		try {
			contextContainer.addContext(newContext );
		} catch (ContextAlreadyExistsException e) {
			throw new InvalidContextException("the context with id "+vreName+" already exists");
		}
		for (String resourceId: resourcesIds) {
			contextContainer.addResource(newContext.getId(), resourceId);
			log.debug("resource {} added", resourceId);
		}
		
		mandatoryContextOperators.forEach(co -> co.onCreate(newContext));
	}
	
	public void disposeContext(String contextId) throws InvalidContextException {
		Context context = contextContainer.getContextById(contextId);
		contextContainer.removeContext(contextId);
		mandatoryContextOperators.forEach(co -> co.onDispose(context));
	}
	
	public List<String> getAvailableContexts(){
		return contextContainer.getAvailableContexts();
	}
	
	public List<String> getAssociatedResources(String contextId)  throws InvalidContextException{
		return contextContainer.getResources(contextId);
	}
}