/**
 *
 */
package org.gcube.portlets.gcubeckan.gcubeckandatacatalog.server;

import static org.gcube.resources.discovery.icclient.ICFactory.client;
import static org.gcube.resources.discovery.icclient.ICFactory.queryFor;

import java.util.List;

import org.gcube.common.resources.gcore.GCoreEndpoint;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.resources.discovery.client.api.DiscoveryClient;
import org.gcube.resources.discovery.client.queries.api.SimpleQuery;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * Jun 10, 2016
 */
public class GcoreEndpointReader {

	private static final String ckanResource = "org.gcube.data.access.ckanconnector.CkanConnector";
	private static final String serviceName = "CkanConnector";
	private static final String serviceClass = "DataAccess";

	private static Logger logger = LoggerFactory.getLogger(GcoreEndpointReader.class);
	private String ckanResourceEntyName;
	/**
	 *
	 */
	public GcoreEndpointReader(String scope) {

		try{

			logger.info("set scope "+scope);
			ScopeProvider.instance.set(scope);

			SimpleQuery query = queryFor(GCoreEndpoint.class);
			query.addCondition(String.format("$resource/Profile/ServiceClass/text() eq '%s'",serviceClass));
			query.addCondition("$resource/Profile/DeploymentData/Status/text() eq 'ready'");
			query.addCondition(String.format("$resource/Profile/ServiceName/text() eq '%s'",serviceName));
			query.setResult("$resource/Profile/AccessPoint/RunningInstanceInterfaces//Endpoint[@EntryName/string() eq \""+ckanResource+"\"]/text()");

			logger.debug("submitting quey "+query.toString());

			DiscoveryClient<String> client = client();
			List<String> endpoints = client.submit(query);
			if (endpoints == null || endpoints.isEmpty()) throw new Exception("Cannot retrieve the GCoreEndpoint serviceName: "+serviceName +", serviceClass: " +serviceClass +", in scope: "+scope);


			this.ckanResourceEntyName = endpoints.get(0);
			if(ckanResourceEntyName==null)
				throw new Exception("Endpoint:"+ckanResource+", is null for serviceName: "+serviceName +", serviceClass: " +serviceClass +", in scope: "+scope);

			logger.info("found entyname "+ckanResourceEntyName+" for ckanResource: "+ckanResource);

			/*Group<Endpoint> accessPoints = se.profile().endpoints();
			if(accessPoints.size()==0) throw new Exception("Endpoint in serviceName serviceName: "+serviceName +", serviceClass: " +serviceClass +", in scope: "+scope +" not found");

			Endpoint ep = accessPoints.iterator().next();

			String epName = ep.name();

			System.out.println(epName);*/

		}catch(Exception e){
			logger.error("An error occurred during GCoreEndpoint discovery, serviceName: "+serviceName +", serviceClass: " +serviceClass +", in scope: "+scope +" not found", e);
		}finally{
			logger.info("scope provider reset");
			ScopeProvider.instance.reset();
		}
	}

	/**
	 * @return the ckanResourceEntyName
	 */
	public String getCkanResourceEntyName() {

		return ckanResourceEntyName;
	}
}