D-Net

package eu.dnetlib.efg.thumbnails;

import eu.dnetlib.data.objectstore.connector.ObjectStore;

import eu.dnetlib.data.objectstore.gridFS.GridFSObjectStore;

import eu.dnetlib.data.objectstore.gridFS.GridFSObjectstoreDaoImpl;

import eu.dnetlib.enabling.locators.UniqueServiceLocator;

import eu.dnetlib.miscutils.collections.Pair;

import eu.dnetlib.rmi.data.ObjectStoreFile;

import eu.dnetlib.rmi.enabling.ISLookUpService;

import org.apache.commons.io.IOUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletResponse;

import java.io.InputStream;

import java.net.URL;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

 * Created by sandro on 4/12/17.

 */

@Controller

public class ThumbnailController {

    @Autowired

    UniqueServiceLocator serviceLocator;

    @Autowired

    GridFSObjectstoreDaoImpl objectstoreDao;

    private Map<String, String> objectStoresThumbnail;

    @RequestMapping(value = "/ui/thumbnail/objectStoresThumbnail")

    @ResponseBody

    public Map<String, String> getObjectStoresThumbnail(ModelMap map) throws Exception {

        if (objectStoresThumbnail == null) {

            createObjectStoreThumbnail();

        }

        return objectStoresThumbnail;

    }

    @RequestMapping(value = "/ui/thumbnail/getThumbnail")

    public void getThumbnail(final HttpServletResponse response, @RequestParam(name = "metadataId") final String metadataId, @RequestParam(name = "imageSize") final int imageSize, @RequestParam(name = "imageType") final String type) throws Exception {

        if (imageSize != 96 && imageSize != 250) throw new Exception("Image size not supported!");

        if (objectStoresThumbnail == null) {

            createObjectStoreThumbnail();

        }

        final GridFSObjectStore objectStore = (GridFSObjectStore) objectstoreDao.getObjectStore(objectStoresThumbnail.get(String.format("thumb%d", imageSize == 250 ? 256 : imageSize)));

        final ObjectStoreFile objectStoreFile = objectStore.deliverObjectFromMetadataIdentifier(metadataId);

        InputStream inputStream = null;

        if (objectStoreFile == null) {

            inputStream = getClass().getResourceAsStream(String.format("/eu/dnetlib/thumbnail/NF%s_%d.jpg", type.toLowerCase(), imageSize));

        } else {

            inputStream = objectStore.deliverStream(objectStoreFile.getObjectID());

        }

        if (inputStream != null) {

            try {

                final ServletOutputStream outputStream = response.getOutputStream();

                IOUtils.copy(inputStream, outputStream);

            } finally {

                inputStream.close();

            }

        }

    }

    private void createObjectStoreThumbnail() throws Exception {

        final String query = "for $x in collection('/db/DRIVER/ObjectStoreDSResources/ObjectStoreDSResourceType')\n" +

                "where  $x//OBJECTSTORE_INTERPRETATION = 'thumb96' or $x//OBJECTSTORE_INTERPRETATION = 'thumb256' \n" +

                " return concat($x//OBJECTSTORE_INTERPRETATION, '<-->',   $x//RESOURCE_IDENTIFIER/@value/string())";

        final ISLookUpService lookUpService = serviceLocator.getService(ISLookUpService.class);

        final List<String> queryResult = lookUpService.quickSearchProfile(query);

        if (queryResult == null) {

            throw new Exception("Missing objectStore Thumbnail");

        }

        objectStoresThumbnail = new HashMap<>();

        queryResult.stream().forEach(item -> {

            final String[] splitString = item.split("<-->");

            if (splitString == null || splitString.length != 2)

                throw new RuntimeException("Error wrong splitting");

            objectStoresThumbnail.put(splitString[0], splitString[1]);

        });

    }

}