/**
 *
 */
package org.gcube.datatransfer.resolver.services;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
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 org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.common.scope.impl.ScopeBean;
import org.gcube.common.scope.impl.ScopeBean.Type;
import org.gcube.datatransfer.resolver.requesthandler.RequestHandler;
import org.gcube.datatransfer.resolver.services.error.ExceptionManager;
import org.gcube.datatransfer.resolver.util.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The KnimeCreateResolver is able to create a KNIME URL.
 * 
 * See more at
 * https://gcube.wiki.gcube-system.org/gcube/URI_Resolver#KNIME_Resolver
 * 
 * @author Francesco Mangiacrapa at ISTI-CNR francesco.mangiacrapa@isti.cnr.it
 * 
 *         Mar 24, 2022
 */
@Path("knime")
public class KnimeCreateResolver {

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

	private static String helpURI = "https://gcube.wiki.gcube-system.org/gcube/URI_Resolver#KNIME_Resolver";

	/**
	 * Creates the KNIME URL. Generate a Knime URL (then resolved by the /get path)
	 * for a KNIME Model Simulation passed by query string.
	 * 
	 * See more at
	 * https://gcube.wiki.gcube-system.org/gcube/URI_Resolver#HTTP_POST:_Create_a_KNIME_URL
	 *
	 * @param req the req
	 * @return the response
	 * @throws WebApplicationException the web application exception
	 */
	@POST
	@Path("/create")
	@Consumes(MediaType.TEXT_PLAIN)
	@Produces(MediaType.TEXT_PLAIN)
	public Response createKnimeURL(@Context HttpServletRequest req) throws WebApplicationException {

		logger.info(this.getClass().getSimpleName() + " POST starts...");

		try {
			String contextToken = SecurityTokenProvider.instance.get();
			String scope = ScopeProvider.instance.get();
			// logger.info("SecurityTokenProvider contextToken: "+contextToken);
			logger.info("ScopeProvider has scope: " + scope);

			String appToken = req.getServletContext().getInitParameter(RequestHandler.ROOT_APP_TOKEN);

			if (contextToken.compareTo(appToken) == 0) {
				logger.error("Token not passed, SecurityTokenProvider contains the root app token: "
						+ appToken.substring(0, 10) + "...");
				throw ExceptionManager.unauthorizedException(req,
						"You are not authorized. You must pass a token of VRE", this.getClass(), helpURI);
			}

			ScopeBean scopeBean = new ScopeBean(scope);

			if (scopeBean.is(Type.VRE)) {

				String vreName = scopeBean.name();
				String knimeGetResolverURL = String.format("%s/%s/%s", Util.getServerURL(req), "knime/get", vreName);
				String queryString = req.getQueryString() == null ? "" : req.getQueryString();

				if (req.getQueryString() != null)
					knimeGetResolverURL += "?" + queryString;

				logger.info("Returning Knime Resolver URL: " + knimeGetResolverURL);
				return Response.ok(knimeGetResolverURL).header("Location", knimeGetResolverURL).build();

			} else {
				logger.error("The input scope " + scope + " is not a VRE");
				throw ExceptionManager.badRequestException(req,
						"Working in the " + scope + " scope that is not a VRE. Use a token of VRE", this.getClass(),
						helpURI);
			}
		} catch (Exception e) {

			if (!(e instanceof WebApplicationException)) {
				// UNEXPECTED EXCEPTION managing it as WebApplicationException
				String error = "Sorry, an error occurred on creating Knime URL. Please, contact the support!";
				if (e.getCause() != null)
					error += "\n\nCaused: " + e.getCause().getMessage();
				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
			}
			// ALREADY MANAGED AS WebApplicationException
			logger.error("Exception:", e);
			throw (WebApplicationException) e;
		}
	}
}