package org.gcube.informationsystem.resourceregistry.publisher.proxy;

import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.Random;

import org.gcube.common.authorization.client.Constants;
import org.gcube.common.authorization.library.AuthorizationEntry;
import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.resources.gcore.GCoreEndpoint;
import org.gcube.common.resources.gcore.GCoreEndpoint.Profile.Endpoint;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.informationsystem.impl.utils.Entities;
import org.gcube.informationsystem.model.embedded.Embedded;
import org.gcube.informationsystem.model.entity.Facet;
import org.gcube.informationsystem.model.entity.Resource;
import org.gcube.informationsystem.model.relation.ConsistsOf;
import org.gcube.informationsystem.model.relation.IsRelatedTo;
import org.gcube.informationsystem.resourceregistry.api.rest.EntityPath;
import org.gcube.resources.discovery.client.api.DiscoveryClient;
import org.gcube.resources.discovery.client.queries.api.SimpleQuery;
import org.gcube.resources.discovery.icclient.ICFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class ResourceRegistryPublisherImpl implements ResourceRegistryPublisher {

	private static final Logger logger = LoggerFactory.getLogger(ResourceRegistryPublisher.class);
	
	private static final Random random;
	
	protected final List<GCoreEndpoint> endpoints;
	
	static {
		random = new Random();
	}
	
	protected static List<GCoreEndpoint> getServiceEndpoint(){
		SimpleQuery query = ICFactory.queryFor(GCoreEndpoint.class);
		query.addCondition(String.format("$resource/Profile/ServiceClass/text() eq '%s'", org.gcube.informationsystem.resourceregistry.Constants.SERVICE_CLASS));
		query.addCondition(String.format("$resource/Profile/ServiceName/text() eq '%s'", org.gcube.informationsystem.resourceregistry.Constants.SERVICE_NAME));
		query.setResult("$resource");
		
		DiscoveryClient<GCoreEndpoint> client = ICFactory.clientFor(GCoreEndpoint.class);
		return client.submit(query);
	}
	
	protected ResourceRegistryPublisherImpl(){
		this.endpoints = getServiceEndpoint();
	};
	
	private static int randInt(int min, int max) {
		int randomNum = random.nextInt((max - min) + 1) + min;
	    return randomNum;
	}
	
	protected URL getBaseURL() throws MalformedURLException {
		GCoreEndpoint gCoreEndpoint = endpoints.get(randInt(0, endpoints.size()-1));
		Endpoint endpoint = gCoreEndpoint.profile().endpointMap().get(org.gcube.informationsystem.resourceregistry.Constants.SERVICE_ENTRY_NAME);
		return endpoint.uri().toURL();
	}
	
	protected AuthorizationEntry getAuthorizationEntry() {
		try{
			AuthorizationEntry info = Constants.authorizationService().get(SecurityTokenProvider.instance.get());
			logger.info("Context is {} ",info.getContext());
			return info;
		}catch(Exception e){
			String error = "Error retreiving security token";
			logger.warn(error,e);
			throw new RuntimeException(error,e);
		}
	}
	
	private HttpURLConnection makeRequest(URL url, String method) throws Exception{
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		if (SecurityTokenProvider.instance.get()==null) {
			if(ScopeProvider.instance.get()==null){
				throw new RuntimeException("Null Token and Scope. Please set your token first.");
			}
			connection.setRequestProperty("gcube-scope", ScopeProvider.instance.get());
		}else{
			connection.setRequestProperty(Constants.TOKEN_HEADER_ENTRY, SecurityTokenProvider.instance.get());
		}
		connection.setRequestMethod(method);
		connection.setDoOutput(true);
		return connection;
	}
	
	protected HttpURLConnection getHttpURLConnection(String path, String method, Map<String,String> paramenter) throws Exception {
		URL url = new URL(getBaseURL(), path);
		HttpURLConnection connection = makeRequest(url, method);
		return connection;
	}

	@Override
	public <E extends Embedded> E createEmbedded(E embedded) {
		return null;
	}

	@Override
	public <E extends Embedded> E updateEmbedded(E embedded) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <E extends Embedded> E deleteEmbedded(E embedded) {
		// TODO Auto-generated method stub
		return null;
	}


	@Override
	public <F extends Facet> F createFacet(F facet) {
		String marshalledFacet = Entities.marshal(facet);
		String path = EntityPath.ENTITY_PATH_PART + "/" + EntityPath.FACET_PATH_PART + "/" + facet.NAME + "?" + EntityPath.DEFINITION_PARAM + "=" + marshalledFacet;
		HttpURLConnection connection =  getHttpURLConnection(path,);			
		
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <F extends Facet> F updateFacet(F facet) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <F extends Facet> F deleteFacet(F facet) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <R extends Resource> R createResource(R resource) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <R extends Resource> R deleteResource(R resource) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <C extends ConsistsOf<Resource, Facet>> C createConsistsOf(
			C consistsOf) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <C extends ConsistsOf<Resource, Facet>> C updateConsistsOf(
			C consistsOf) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <C extends ConsistsOf<Resource, Facet>> C deleteConsistsOf(
			C consistsOf) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <I extends IsRelatedTo<Resource, Resource>> I create(I isRelatedTo) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <I extends IsRelatedTo<Resource, Resource>> I update(I isRelatedTo) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public <I extends IsRelatedTo<Resource, Resource>> I delete(I isRelatedTo) {
		// TODO Auto-generated method stub
		return null;
	}

}