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.integrity.exception.CurisException;
import net.curisit.securis.DefaultExceptionHandler;
import net.curisit.securis.db.License;
import net.curisit.securis.db.Pack;
import net.curisit.securis.db.User;
import net.curisit.securis.utils.TokenHelper;

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

import com.google.inject.persist.Transactional;

/**
 * License resource, this service will provide methods to create, modify and delete licenses
 * 
 * @author roberto <roberto.sanchez@curisit.net>
 */
@Path("/organization")
public class LicenseResource {

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

	@Inject
	TokenHelper tokenHelper;

	@Inject
	Provider<EntityManager> emProvider;

	public LicenseResource() {
	}

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

		EntityManager em = emProvider.get();
		TypedQuery<License> q = em.createNamedQuery("list-licenses-by-pack", License.class);

		List<License> list = q.getResultList();

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

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

		EntityManager em = emProvider.get();
		License lt = em.find(License.class, Integer.parseInt(licId));
		if (lt == null) {
			log.error("License with id {} not found in DB", licId);
			return Response.status(Status.NOT_FOUND).build();
		}
		return Response.ok(lt).build();
	}

	@POST
	@Path("/")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(
		{ MediaType.APPLICATION_JSON })
	@Transactional
	public Response create(License lic, @HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token) {
		log.info("Creating new organization");
		EntityManager em = emProvider.get();
		Pack pack = null;
		if (lic.getPackId() != null) {
			pack = em.find(Pack.class, lic.getPackId());
			if (pack == null) {
				log.error("License pack with id {} not found in DB", lic.getPackId());
				return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "License's pack not found with ID: " + lic.getPackId()).build();
			}
		}

		try {
			User createdBy = getUser(lic.getCreatedById(), em);
			lic.setCreatedBy(createdBy);
		} catch (CurisException ex) {
			String createdByUsername = lic.getCreatedById();
			log.error("License created by user with id {} not found in DB", createdByUsername);
			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "License's created by user not found with ID: " + createdByUsername).build();
		}

		try {
			User canceledBy = getUser(lic.getCanceledById(), em);
			lic.setCanceledBy(canceledBy);
		} catch (CurisException ex) {
			String canceledByUsername = lic.getCreatedById();
			log.error("License canceled by user with id {} not found in DB", canceledByUsername);
			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "License's canceled by user not found with ID: " + canceledByUsername).build();
		}

		lic.setCreationTimestamp(new Date());
		em.persist(lic);

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

	private User getUser(String username, EntityManager em) throws CurisException {
		User user = null;
		if (username != null) {
			user = em.find(User.class, username);
			if (user == null) {
				throw new CurisException("User not found");
			}
		}
		return user;
	}

	@PUT
	@POST
	@Path("/{licId}")
	@Transactional
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(
		{ MediaType.APPLICATION_JSON })
	public Response modify(License lic, @PathParam("licId") String licId, @HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token) {
		log.info("Modifying organization with id: {}", licId);
		EntityManager em = emProvider.get();

		Pack pack = null;
		if (lic.getPackId() != null) {
			pack = em.find(Pack.class, lic.getPackId());
			if (pack == null) {
				log.error("License pack with id {} not found in DB", lic.getPackId());
				return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "License's pack not found with ID: " + lic.getPackId()).build();
			}
		}
		User createdBy = null;
		try {
			createdBy = getUser(lic.getCreatedById(), em);
		} catch (CurisException ex) {
			String createdByUsername = lic.getCreatedById();
			log.error("License created by user with id {} not found in DB", createdByUsername);
			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "License's created by user not found with ID: " + createdByUsername).build();
		}

		User canceledBy = null;
		try {
			canceledBy = getUser(lic.getCanceledById(), em);
		} catch (CurisException ex) {
			String canceledByUsername = lic.getCreatedById();
			log.error("License canceled by user with id {} not found in DB", canceledByUsername);
			return Response.status(Status.NOT_FOUND).header(DefaultExceptionHandler.ERROR_MESSAGE_HEADER, "License's canceled by user not found with ID: " + canceledByUsername).build();
		}

		lic.setCreatedBy(createdBy);
		lic.setCanceledBy(canceledBy);
		lic.setPack(pack);
		em.persist(lic);

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

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

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

}