package org.gcube.portal.social.networking.ws.methods.v2;

import java.util.Arrays;
import java.util.List;

import javax.validation.Valid;
import javax.validation.ValidationException;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.ws.rs.Consumes;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;

import org.gcube.applicationsupportlayer.social.ApplicationNotificationsManager;
import org.gcube.applicationsupportlayer.social.NotificationsManager;
import org.gcube.applicationsupportlayer.social.shared.SocialNetworkingSite;
import org.gcube.applicationsupportlayer.social.shared.SocialNetworkingUser;
import org.gcube.common.authorization.library.provider.AuthorizationProvider;
import org.gcube.common.authorization.library.utils.Caller;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.portal.databook.shared.Notification;
import org.gcube.portal.databook.shared.RunningJob;
import org.gcube.portal.notifications.bean.GenericItemBean;
import org.gcube.portal.notifications.thread.JobStatusNotificationThread;
import org.gcube.portal.social.networking.caches.SocialNetworkingSiteFinder;
import org.gcube.portal.social.networking.liferay.ws.LiferayJSONWsCredentials;
import org.gcube.portal.social.networking.liferay.ws.UserManagerWSBuilder;
import org.gcube.portal.social.networking.ws.mappers.JobMapper;
import org.gcube.portal.social.networking.ws.mappers.WorkspaceItemMapper;
import org.gcube.portal.social.networking.ws.outputs.ResponseBean;
import org.gcube.portal.social.networking.ws.utils.CassandraConnection;
import org.gcube.portal.social.networking.ws.utils.ErrorMessages;
import org.gcube.social_networking.socialnetworking.model.beans.JobNotificationBean;
import org.gcube.social_networking.socialnetworking.model.beans.WorkspaceNotification;
import org.gcube.social_networking.socialnetworking.model.beans.WorkspaceNotificationAddedItem;
import org.gcube.social_networking.socialnetworking.model.beans.WorkspaceNotificationSharedFolder;
import org.gcube.social_networking.socialnetworking.model.beans.WorkspaceNotificationUnsharedFolder;
import org.gcube.vomanagement.usermanagement.model.GCubeUser;
import org.slf4j.LoggerFactory;

import com.webcohesion.enunciate.metadata.rs.RequestHeader;
import com.webcohesion.enunciate.metadata.rs.RequestHeaders;
import com.webcohesion.enunciate.metadata.rs.ResponseCode;
import com.webcohesion.enunciate.metadata.rs.StatusCodes;

/**
 * REST interface for the social networking library (notifications).
 */
@Path("2/notifications")
@RequestHeaders ({
	@RequestHeader( name = "Authorization", description = "Bearer token, see https://dev.d4science.org/how-to-access-resources"),
	@RequestHeader( name = "Content-Type", description = "application/json")	  
})
public class Notifications {

	// Logger
	private static final org.slf4j.Logger logger = LoggerFactory.getLogger(Notifications.class);

	@GET
	@Path("get-range-notifications/")
	@Produces(MediaType.APPLICATION_JSON)
	/**
	 * Retrieve notifications of the gcube-token's owner
	 * @param from  must be greater or equal to 1, range[0, infinity]
	 * @param quantity quantity must be greater or equal to 0
	 * @return notifications up to quantity
	 * @throws ValidationException
	 */
	@StatusCodes ({
		@ResponseCode ( code = 200, condition = "Notifications retrieved and reported in the 'result' field of the returned object"),
		@ResponseCode ( code = 500, condition = ErrorMessages.ERROR_IN_API_RESULT)
	})
	public Response getRangeNotifications(
			@DefaultValue("1") @QueryParam("from") @Min(value=1, message="from must be greater or equal to 1") 
			int from,
			@DefaultValue("10") @QueryParam("quantity") @Min(value=0, message="quantity must be greater or equal to 0") 
			int quantity
			) throws ValidationException{

		Caller caller = AuthorizationProvider.instance.get();
		String username = caller.getClient().getId();

		logger.debug("Retrieving " +  quantity + " notifications of user = " + username + " from " + from);

		ResponseBean responseBean = new ResponseBean();
		Status status = Status.OK;

		List<Notification> notifications = null;
		try{
			notifications = CassandraConnection.getInstance().getDatabookStore().getRangeNotificationsByUser(username, from, quantity);
			responseBean.setResult(notifications);
			responseBean.setSuccess(true);
			logger.debug("List of notifications retrieved");
		}catch(Exception e){
			logger.error("Unable to retrieve such notifications.", e);
			responseBean.setMessage(e.getMessage());
			responseBean.setSuccess(false);
			status = Status.INTERNAL_SERVER_ERROR;
		}

		return Response.status(status).entity(responseBean).build();
	}

	/**
	 * Send a JOB notification to a given recipient
	 * @param job The job bean
	 * @return
	 * @throws ValidationException
	 */
	@POST
	@Path("notify-job-status/")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.APPLICATION_JSON)
	@StatusCodes ({
		@ResponseCode ( code = 200, condition = "Notification is sent correctly"),
		@ResponseCode ( code = 500, condition = ErrorMessages.ERROR_IN_API_RESULT)
	})
	public Response notifyJobStatus(
			@NotNull(message="input is missing") 
			@Valid 
			JobNotificationBean job) throws ValidationException{

		Caller caller = AuthorizationProvider.instance.get();
		String context  = ScopeProvider.instance.get();
		ResponseBean responseBean = new ResponseBean();
		Status status = Status.OK;

		String appQualifier = caller.getClient().getId();
		logger.info("Received request from app " + appQualifier + " to notify job status described by bean " + job);

		try{

			String recipient = job.getRecipient();
			GCubeUser userRecipient = UserManagerWSBuilder.getInstance().getUserManager().getUserByUsername(recipient);
			GenericItemBean recipientBean = new GenericItemBean(userRecipient.getUsername(), userRecipient.getUsername(), userRecipient.getFullname(), userRecipient.getUserAvatarURL());

			// notifications are sent by using the user allowed to use liferay's json apis
			SocialNetworkingSite site = SocialNetworkingSiteFinder.getSocialNetworkingSiteFromScope(context);
			GCubeUser senderUser = UserManagerWSBuilder.getInstance().getUserManager().getUserByEmail(LiferayJSONWsCredentials.getSingleton().getUser());
			SocialNetworkingUser user = new SocialNetworkingUser(senderUser.getUsername(), senderUser.getEmail(), senderUser.getFullname(), senderUser.getUserAvatarURL());
			NotificationsManager nm = new ApplicationNotificationsManager(UserManagerWSBuilder.getInstance().getUserManager(), site, context, user);

			RunningJob theJob = JobMapper.getJob(job);
			
			new Thread(new JobStatusNotificationThread(theJob, Arrays.asList(recipientBean), nm)).start();
			responseBean.setSuccess(true);
			responseBean.setResult("Notification thread started");

		}catch(Exception e){
			logger.error("Unable to send job notification", e);
			responseBean.setSuccess(false);
			responseBean.setMessage(e.getMessage());
			status = Status.INTERNAL_SERVER_ERROR;
		}


		return Response.status(status).entity(responseBean).build();
	}

	/**
	 * Send a Workspace notification to a given user
	 * @param message
	 * @return
	 * @throws ValidationException
	 */
	@POST
	@Path("workspace/")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.APPLICATION_JSON)
	@StatusCodes ({
		@ResponseCode ( code = 200, condition = "Workspace Notification is sent correctly"),
		@ResponseCode ( code = 500, condition = ErrorMessages.ERROR_IN_API_RESULT)
	})
	public Response workspace(
			@NotNull(message="input is missing") 
			@Valid 
			WorkspaceNotification message) throws ValidationException{

		Caller caller = AuthorizationProvider.instance.get();
		String context  = ScopeProvider.instance.get();
		String username = caller.getClient().getId();

		if (!message.getType().getNotificationClass().isInstance(message)) {
			//invalid call
			return Response.status(Status.BAD_REQUEST).build();
		}

		ResponseBean responseBean = new ResponseBean();
		Status status = Status.OK;
		
		try{
			SocialNetworkingSite site = SocialNetworkingSiteFinder.getSocialNetworkingSiteFromScope(context);
			GCubeUser senderUser = UserManagerWSBuilder.getInstance().getUserManager().getUserByUsername(username);			
			SocialNetworkingUser user = new SocialNetworkingUser(senderUser.getUsername(), senderUser.getEmail(), senderUser.getFullname(), senderUser.getUserAvatarURL());
			NotificationsManager nm = new ApplicationNotificationsManager(UserManagerWSBuilder.getInstance().getUserManager(), site, context, user);		
			switch (message.getType()) {
			case ITEM_NEW: {
				WorkspaceNotificationAddedItem itemBean = (WorkspaceNotificationAddedItem) message;
				String userIdToNotify = itemBean.getUserIdToNotify();
				nm.notifyAddedItem(userIdToNotify, WorkspaceItemMapper.getFileItem(itemBean.getItem()), WorkspaceItemMapper.getSharedFolder(itemBean.getFolder()));
				break;
			}
			case FOLDER_SHARE: {
				WorkspaceNotificationSharedFolder itemBean = (WorkspaceNotificationSharedFolder) message;
				String userIdToNotify = itemBean.getUserIdToNotify();			
				nm.notifyFolderSharing(userIdToNotify, WorkspaceItemMapper.getSharedFolder(itemBean.getFolder()));				
				break;
			}
			case FOLDER_UNSHARE: {
				WorkspaceNotificationUnsharedFolder itemBean = (WorkspaceNotificationUnsharedFolder) message;
				String userIdToNotify = itemBean.getUserIdToNotify();
				nm.notifyFolderUnsharing(userIdToNotify, itemBean.getUnsharedFolderId(), itemBean.getUnsharedFolderName());
				break;
			}


			default:
				break;
			}
		} catch(Exception e){
			logger.error("Unable to send job notification", e);
			responseBean.setSuccess(false);
			responseBean.setMessage(e.getMessage());
			status = Status.INTERNAL_SERVER_ERROR;
		}

		return Response.status(status).entity(responseBean).build();
	}

}