package org.gcube.data_catalogue.grsf_publish_ws.services;

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.validation.Valid;
import javax.validation.ValidationException;
import javax.validation.constraints.NotNull;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
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 org.gcube.common.authorization.library.provider.AuthorizationProvider;
import org.gcube.common.authorization.library.provider.SecurityTokenProvider;
import org.gcube.common.authorization.library.utils.Caller;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.data_catalogue.grsf_publish_ws.json.input.DeleteProductBean;
import org.gcube.data_catalogue.grsf_publish_ws.json.input.StockRecord;
import org.gcube.data_catalogue.grsf_publish_ws.json.output.ResponseCreationBean;
import org.gcube.data_catalogue.grsf_publish_ws.utils.HelperMethods;
import org.gcube.data_catalogue.grsf_publish_ws.utils.threads.AssociationToGroupThread;
import org.gcube.data_catalogue.grsf_publish_ws.utils.threads.ManageTimeSeriesThread;
import org.gcube.datacatalogue.ckanutillibrary.DataCatalogue;
import org.gcube.datacatalogue.ckanutillibrary.models.ResourceBean;
import org.gcube.datacatalogue.ckanutillibrary.models.RolesCkanGroupOrOrg;
import org.slf4j.LoggerFactory;

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

/**
 * Stock web service methods
 * @author Costantino Perciante at ISTI-CNR
 */
@Path("stock/")
public class GrsfPublisherStockService {

	private static final String DEFAULT_STOCK_LICENSE = "CC-BY-SA-4.0";
	private static final String THIS_TYPE = "Stock";

	// the context
	@Context 
	ServletContext contextServlet;

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

	@GET
	@Path("hello")
	@Produces(MediaType.TEXT_PLAIN)
	public Response hello(){
		return Response.ok("Hello.. Stock service is here").build();
	}

	@GET
	@Path("get-licenses")
	@Produces(MediaType.APPLICATION_JSON)
	public Response getLicenses(){

		// since are equals for stock and fishery, we just retrieve them all
		Map<String, String> licenses = new HashMap<String, String>();
		Status status;
		try{
			licenses = HelperMethods.getLicenses(HelperMethods.getDataCatalogueRunningInstance(ScopeProvider.instance.get()));
			status = Status.OK;
		}catch(Exception e){
			logger.error("Failed to retrieve the list of licenses");
			status = Status.INTERNAL_SERVER_ERROR;
		}
		return Response.status(status).entity(licenses).build();

	}

	@POST
	@Path("publish-product")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.APPLICATION_JSON)
	public Response publishStock(
			@NotNull(message="record cannot be null") @Valid StockRecord record) throws ValidationException{

		// retrieve context and username
		Caller caller = AuthorizationProvider.instance.get();
		String username = caller.getClient().getId();
		String context = ScopeProvider.instance.get();
		String token = SecurityTokenProvider.instance.get();

		logger.info("Incoming request for creating a stock record = " + record);
		logger.info("Request coming from user " + username + " in context " + context);

		ResponseCreationBean responseBean = new ResponseCreationBean();
		Status status = Status.INTERNAL_SERVER_ERROR;

		try{

			// determine the organization in which this product should be put
			String contextInWhichPublish = HelperMethods.getContextFromStatus(record.getStatus(), contextServlet);

			if(contextInWhichPublish == null || !contextInWhichPublish.equals(context)){

				// stop, this value must be defined
				status = Status.BAD_REQUEST;
				throw new IllegalArgumentException("Status attribute is not defined or the Token you are using is not correct to perform such request!");

			}else{

				DataCatalogue catalogue = HelperMethods.getDataCatalogueRunningInstance(context);
				if(catalogue == null){

					status = Status.INTERNAL_SERVER_ERROR;
					throw new Exception("There was a problem while serving your request");

				}else{

					// check the user has editor/admin role into the org
					String organization = HelperMethods.retrieveOrgNameFromScope(contextInWhichPublish);
					String role = catalogue.getRoleOfUserInOrganization(username, organization, catalogue.getApiKeyFromUsername(username));
					logger.info("***************************Role of the user " + username + " is " + role);
					if(!role.equalsIgnoreCase(RolesCkanGroupOrOrg.ADMIN.toString())){

						status = Status.FORBIDDEN;
						throw new Exception("You are not authorized to create a product. Please check you have the Catalogue-Administrator role!");

					}

					// check the record has a name, at least
					String futureName = record.getUuid();
					String futureTitle = record.getStockName();
					if(!HelperMethods.isNameValid(futureName)){

						status = Status.BAD_REQUEST;
						throw new Exception("The name requested for the product is not correct! It should contain only alphanumeric characters, and symbols like '.' or '_', '-'");

					}else{

						logger.debug("Checking if such name [" + futureName + "] doesn't exist yet...");
						boolean alreadyExist = catalogue.existProductWithNameOrId(futureName);

						if(alreadyExist){

							logger.debug("A product with name " + futureName + " already exists");
							status = Status.CONFLICT;
							throw new Exception("Sorry but a product with such name already exists!");

						}else{

							// set the type
							record.setProductType(THIS_TYPE);

							// evaluate the tags of the product
							List<String> tags = new ArrayList<String>();
							HelperMethods.getTags(tags, record);

							// evaluate the groups
							List<String> groups = new ArrayList<String>();
							HelperMethods.getGroups(groups, record);

							// evaluate the custom fields
							Map<String, List<String>> customFields = new HashMap<String, List<String>>();

							if(record.getExtras() != null)
								customFields = record.getExtras();

							// automatically retrieve the other ones
							HelperMethods.getExtras(customFields, record);

							// retrieve the user's email and fullname
							String authorMail = HelperMethods.getUserEmail(context, token);
							String authorFullname = HelperMethods.getUserFullname(context, token);

							if(authorMail == null || authorFullname == null){

								logger.debug("Author fullname or mail missing, cannot continue");
								responseBean.setId(null);
								status = Status.INTERNAL_SERVER_ERROR;
								throw new Exception("Sorry but was not possible to retrieve your fullname/email!");

							}else{

								// evaluate the resources
								List<ResourceBean> resources = HelperMethods.getResourcesFromBean(record, username, tags, groups);

								// check the license id
								String license = null;
								if(record.getLicense() == null || record.getLicense().isEmpty())
									license = DEFAULT_STOCK_LICENSE;
								else
									if(HelperMethods.existsLicenseId(record.getLicense(), catalogue))
										license = record.getLicense();
									else throw new Exception("Please check the license id!"); 

								long version = record.getVersion() == null ? 1 : record.getVersion();

								// create the product 
								String id = catalogue.createCKanDatasetMultipleCustomFields(
										catalogue.getApiKeyFromUsername(username), 
										futureTitle, 
										futureName,
										organization, 
										authorFullname, 
										authorMail, 
										record.getMaintainer(), 
										record.getMaintainerContact(), 
										version, 
										record.getDescription(), 
										license, 
										tags, 
										customFields, 
										resources, 
										false);

								if(id != null){

									logger.info("Product created! Id is " + id);
									responseBean.setId(id);
									status = Status.CREATED;
									responseBean.setProductUrl(catalogue.getPortletUrl() + "?" + URLEncoder.encode("path=/dataset/"  + futureName, "UTF-8"));
									responseBean.setKbUuid(record.getUuid());

									if(!groups.isEmpty()){
										logger.info("Launching thread for association to the list of groups " + groups);
										AssociationToGroupThread threadGroups = new AssociationToGroupThread(groups, id, organization, username, catalogue);
										threadGroups.start();
										logger.info("Waiting association thread to die..");
										threadGroups.join();
										logger.debug("Ok, it died");
									}

									// manage time series
									logger.info("Launching thread for time series handling");
									new ManageTimeSeriesThread(record, futureName, username, catalogue, ScopeProvider.instance.get()).start();
								}
							}
						}
					}
				}
			}
		}catch(Exception e){
			logger.error("Failed to create stock record", e);
			responseBean.setError(e.getMessage());
		}

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

	@DELETE
	@Path("delete-product")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.APPLICATION_JSON)
	public Response deleteStock(
			@NotNull(message="missing input value") 
			@Valid DeleteProductBean recordToDelete) throws ValidationException{

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

		ResponseCreationBean responseBean = new ResponseCreationBean();
		Status status = Status.INTERNAL_SERVER_ERROR;

		// check it is a stock ...
		logger.info("Received call to delete product with id " + recordToDelete.getId() + ", checking if it is a stock");
		try{

			DataCatalogue catalogue = HelperMethods.getDataCatalogueRunningInstance(context);
			if(catalogue == null){

				status = Status.INTERNAL_SERVER_ERROR;
				throw new Exception("There was a problem while serving your request");

			}

			// retrieve the catalogue instance
			CkanDataset stockInCkan = catalogue.getDataset(recordToDelete.getId(), catalogue.getApiKeyFromUsername(username));

			if(stockInCkan == null){

				status = Status.NOT_FOUND;
				throw new Exception("There was a problem while serving your request. This product was not found");

			}

			// get extras and check there is the field Assessment distribution area that is mandatory for stock
			if(stockInCkan.getExtrasAsHashMap().containsKey("Stock Name")){

				logger.warn("Ok, this is a stock, removing it");
				boolean deleted = catalogue.deleteProduct(stockInCkan.getId(), catalogue.getApiKeyFromUsername(username), true);
				if(deleted){
					logger.info("Stock DELETED AND PURGED!");
					status = Status.OK;
					responseBean.setId(stockInCkan.getId());
				}
				else{
					status = Status.INTERNAL_SERVER_ERROR;
					throw new Exception("Request failed, sorry");
				}

			}else{
				status = Status.BAD_REQUEST;
				throw new Exception("The id you are using doesn't belong to a Stock product!");
			}

		}catch(Exception e){
			logger.error("Failed to delete this ", e);
			status = Status.INTERNAL_SERVER_ERROR;
			responseBean.setError(e.getMessage());
		}

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

}