package org.gcube.datatransfer.resolver.services;

import java.net.URL;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;

import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.datatransfer.resolver.ResourceCatalogueCodes;
import org.gcube.datatransfer.resolver.applicationprofile.ApplicationProfileNotFoundException;
import org.gcube.datatransfer.resolver.catalogue.CatalogueRequest;
import org.gcube.datatransfer.resolver.catalogue.resource.ApplicationProfileReaderForCatalogueResolver;
import org.gcube.datatransfer.resolver.catalogue.resource.CkanCatalogueConfigurationsReader;
import org.gcube.datatransfer.resolver.catalogue.resource.GatewayCKANCatalogueReference;
import org.gcube.datatransfer.resolver.catalogue.resource.UpdateApplicationProfileCatalogueResolver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.trentorise.opendata.jackan.model.CkanDataset;

@Path("/")
public class Catalogue {

	private static Logger logger = LoggerFactory.getLogger(Catalogue.class);

	public static final String ENV_SCOPE = "SCOPE"; //Environment Variable

	/** The scope to enc decr. */
	private String scopeToEncDecr = null;

	ApplicationProfileReaderForCatalogueResolver appPrCatResolver;

	@GET
	@Path("{entityContext:ctlg(-(o|g|p|d)?}/{vreName}/{entityName}")
	public Response resolveCatalogue(@PathParam("entityName") String entityName, @PathParam("vreName") String vreName, @PathParam("entityContext") String entityContext) {

		try {
			String entityContextValue = ResourceCatalogueCodes.valueOfCodeId(entityContext).getValue();

			ApplicationProfileReaderForCatalogueResolver appPrCatResolver = new ApplicationProfileReaderForCatalogueResolver(vreName, true);

			String fullScope = appPrCatResolver.getHashVreNameScope().get(vreName);

			ScopeProvider.instance.set(fullScope);
			GatewayCKANCatalogueReference ckanCatalogueReference = CkanCatalogueConfigurationsReader.loadCatalogueEndPoints();

			logger.debug("Read fullScope: "+fullScope + " for VRE_NAME: "+vreName +" into Application Profile "+ApplicationProfileReaderForCatalogueResolver.RESOURCE_NAME);

			//IS THE PRODUCT PLUBLIC OR PRIVATE?
			//USING ACCESS TO PUBLIC PORTLET IF THE ITEM IS PUBLIC, OTHERWISE ACCESS TO PRIVATE PORTLET
			String ckanPorltetUrl = ckanCatalogueReference.getPrivatePortletURL();
			String datasetName = entityName;
			if(ckanCatalogueReference.getCkanURL()!=null){
				try{
					CkanDataset dataset = CkanCatalogueConfigurationsReader.getDataset(datasetName, ckanCatalogueReference.getCkanURL());
					if(dataset!=null){
						ckanPorltetUrl = ckanCatalogueReference.getPublicPortletURL();
						logger.info("The dataset "+datasetName+" is a public item using public access to CKAN portlet: "+ckanPorltetUrl);
					}
				}catch(Exception e){
					logger.warn("Error on checking if dataset: "+datasetName+" is private or not", e);
					ckanPorltetUrl = ckanCatalogueReference.getPublicPortletURL();
				}
			}


			String url = String.format("%s?path=/%s/%s",ckanPorltetUrl,entityContextValue, entityName);

			return Response.seeOther(new URL(url).toURI()).build();
		}catch (Exception e) {
			logger.error("error resolving catalogue link",e);
			throw new WebApplicationException(e, Status.INTERNAL_SERVER_ERROR);
		}
	}

	@POST
	@Path("catalogue")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.TEXT_PLAIN)
	public Response postCatalogue(@Context HttpServletRequest req, CatalogueRequest jsonRequest) {
		//final CatalogueEntityRequest cer = new CatalogueEntityRequest();

		//CHECK IF INPUT SCOPE IS VALID
		String scope = jsonRequest.getGcube_scope();
		if(!scope.startsWith("/")){
			logger.info("Scope not start with char '/' adding it");
			scope+="/"+scope;
		}

		String serverUrl = getServerURL(req);

		final String vreName = scope.substring(scope.lastIndexOf("/")+1, scope.length());

		ResourceCatalogueCodes rc = ResourceCatalogueCodes.valueOfCodeValue(jsonRequest.getEntity_context());
		if(rc==null){
			logger.error("Entity context is null/malformed");
			throw new WebApplicationException("Entity context is null/malformed", Status.BAD_REQUEST);
		}


		String linkURL = String.format("%s/%s/%s/%s", serverUrl, rc.getId(), vreName, jsonRequest.getEntity_name());

		logger.info("Writing Decoded Catalogue Link: "+linkURL);

		//IT'S GOING TO UPDATE THE GENERIC RESOURCE IF IS NEEDED
		final String fullscope = scope;
		new Thread(){
			public void run() {
				try {
					boolean endPointUpdated = UpdateApplicationProfileCatalogueResolver.validateEndPoint(scopeToEncDecr, vreName, fullscope);
					if(endPointUpdated)
						appPrCatResolver = new ApplicationProfileReaderForCatalogueResolver(fullscope, true);
				}
				catch (ApplicationProfileNotFoundException e) {
					logger.error("Error during validating Application Profile", e);
				}
			};
		}.start();


		return Response.ok(linkURL).build();
	}

	/**
	 * Gets the server url.
	 *
	 * @param req the req
	 * @return the server url
	 */
	private String getServerURL(HttpServletRequest req) {

		String scheme = req.getScheme();             // http
		String serverName = req.getServerName();     // hostname.com
		int serverPort = req.getServerPort();        // 80
		//String contextPath = req.getContextPath();   // /mywebapp

		// Reconstruct original requesting URL
		StringBuffer url =  new StringBuffer();
		url.append(scheme).append("://").append(serverName);

		if (serverPort != 80 && serverPort != 443)
			url.append(":").append(serverPort);

		//	    if(contextPath!=null)
		//	        url.append(":").append(contextPath);

		String uToS = url.toString();
		logger.debug("returning servlet context URL: "+uToS);
		return uToS;
	}

}