package net.curisit.securis.services;

import java.util.Date;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
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 net.curisit.integrity.commons.Utils;
import net.curisit.securis.DefaultExceptionHandler;
import net.curisit.securis.db.Application;
import net.curisit.securis.utils.TokenHelper;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.persist.Transactional;

/**
 * Application resource, this service will provide methods to create, modify and delete applications
 * 
 * @author roberto <roberto.sanchez@curisit.net>
 */
@Path("/application")
public class ApplicationResource {

	@Inject
	TokenHelper tokenHelper;

	@Inject
	Provider<EntityManager> emProvider;

	private static final Logger log = LoggerFactory.getLogger(ApplicationResource.class);

	public ApplicationResource() {
	}

	/**
	 * 
	 * @return the server version in format majorVersion.minorVersion
	 */
	@GET
	@Path("/")
	@Produces(
		{ MediaType.APPLICATION_JSON })
	public Response index() {
		log.info("Getting applications list ");

		EntityManager em = emProvider.get();
		TypedQuery<Application> q = em.createNamedQuery("list-applications", Application.class);
		List<Application> list = q.getResultList();

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

	/**
	 * 
	 * @return the server version in format majorVersion.minorVersion
	 */
	@GET
	@Path("/{appid}")
	@Produces(
		{ MediaType.APPLICATION_JSON })
	public Response get(@PathParam("appid") String appid, @HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token) {
		log.info("Getting application data for id: {}: ", appid);
		if (appid == null || appid.equals("")) {
			log.error("Application ID is mandatory");
			return Response.status(Status.NOT_FOUND).build();
		}

		EntityManager em = emProvider.get();
		Application app = em.find(Application.class, Integer.parseInt(appid));
		if (app == null) {
			log.error("Application with id {} not found in DB", appid);

			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "Application not found with ID: " + appid).build();
		}
		return Response.ok(app).build();
	}

	@POST
	@Path("/")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(
		{ MediaType.APPLICATION_JSON })
	@Transactional
	public Response create(Application app, @HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token) {
		log.info("Creating new application");
		EntityManager em = emProvider.get();
		app.setCreationTimestamp(new Date());
		em.persist(app);

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

	@PUT
	@POST
	@Path("/{appid}")
	@Transactional
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(
		{ MediaType.APPLICATION_JSON })
	public Response modify(Application app, @PathParam("appid") String appid, @HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token) {
		log.info("Modifying application with id: {}", appid);
		EntityManager em = emProvider.get();
		Application currentapp = em.find(Application.class, Integer.parseInt(appid));
		if (currentapp == null) {
			log.error("Application with id {} not found in DB", appid);
			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "Application not found with ID: " + appid).build();
		}
		currentapp.setName(app.getName());
		currentapp.setDescription(app.getDescription());
		em.persist(currentapp);

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

	@DELETE
	@Path("/{appid}")
	@Transactional
	@Produces(
		{ MediaType.APPLICATION_JSON })
	public Response delete(@PathParam("appid") String appid, @Context HttpServletRequest request) {
		log.info("Deleting app with id: {}", appid);
		EntityManager em = emProvider.get();
		Application app = em.find(Application.class, Integer.parseInt(appid));
		if (app == null) {
			log.error("Application with id {} can not be deleted, It was not found in DB", appid);
			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "Application not found with ID: " + appid).build();
		}

		if (app.getLicenseTypes() != null && app.getLicenseTypes().size() > 0) {
			return Response.status(Status.FORBIDDEN).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "Application can not be deleted becasue has assigned one or more License types, ID: " + appid).build();
		}

		em.remove(app);
		return Response.ok(Utils.createMap("success", true, "id", appid)).build();
	}

}