package org.gcube.datatransfer.resolver.services;

import javax.enterprise.context.RequestScoped;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;

import org.gcube.common.storagehub.client.StreamDescriptor;
import org.gcube.common.storagehub.client.dsl.StorageHubClient;
import org.gcube.datatransfer.resolver.services.error.ExceptionManager;
import org.gcube.smartgears.utils.InnerMethodName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Path("shub/{id}")
public class StorageHubResolver {

	/**
	 *
	 */
	public static final String STORAGE_HUB_ID = "id";

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

	private String help = "https://wiki.gcube-system.org/gcube/URI_Resolver#STORAGE-HUB_Resolver";

	@RequestScoped
	@PathParam(STORAGE_HUB_ID)
	String id;

	@GET
	@Path("")
	public Response download(@Context HttpServletRequest httpRequest) {
		InnerMethodName.instance.set("resolveStorageHubPublicLink");
		logger.info(this.getClass().getSimpleName()+" GET starts...");
		StorageHubClient shc = new StorageHubClient();

		//Checking mandatory parameter id
		if(id==null || id.isEmpty()){
			logger.error("Path Parameter "+STORAGE_HUB_ID+" not found");
			ExceptionManager.throwBadRequestException(httpRequest, "Missing mandatory path parameter "+STORAGE_HUB_ID, StorageHubResolver.class, help);
		}

		try{
			StreamDescriptor descriptor = shc.open(id).asFile().download();
			return Response
					.ok(descriptor.getStream())
					.header("content-disposition","attachment; filename = \""+descriptor.getFileName()+"\"").build();

		}catch(Exception e){
			logger.error("Error on getting file with "+id, e);
			String errorMsg =  "Error on getting file with hub id '"+id+"'. "+e.getMessage();
			ExceptionManager.throwInternalErrorException(httpRequest, errorMsg, StorageHubResolver.class, help);
			return null;
		}
	}

	@GET
	@Path("{version}")
	public Response downloadVersion(@Context HttpServletRequest httpRequest, @PathParam("version") String version) {
		InnerMethodName.instance.set("resolveStorageHubPublicLinkWithVersion");
		logger.info(this.getClass().getSimpleName() +" downloadVersion called");
		StorageHubClient shc = new StorageHubClient();

		//Checking mandatory parameter id
		if(id==null || id.isEmpty()){
			logger.error("Path Parameter "+STORAGE_HUB_ID+" not found");
			ExceptionManager.throwBadRequestException(httpRequest, "Missing mandatory path parameter "+STORAGE_HUB_ID, StorageHubResolver.class, help);
		}

		//Checking mandatory parameter id
		if(version==null || version.isEmpty()){
			logger.error("Parameter 'version' not found");
			ExceptionManager.throwBadRequestException(httpRequest, "Missing mandatory parameter 'version'", StorageHubResolver.class, help);
		}
		try{


			StreamDescriptor descriptor = shc.open(id).asFile().downloadSpecificVersion(version);
			return Response
					.ok(descriptor.getStream())
					.header("content-disposition","attachment; filename = \""+descriptor.getFileName()+"\"").build();

		}catch(Exception e){
			String errorMsg = "Error on getting versioned file with hub id '"+id+ "' and version '"+version+"'";
			logger.error(errorMsg, e);
			ExceptionManager.throwInternalErrorException(httpRequest, errorMsg, StorageHubResolver.class, help);
			return null;
		}
	}
}