package org.gcube.data.publishing.ckan2zenodo.clients;

import java.nio.file.Files;
import java.util.*;
import java.util.concurrent.Callable;

import org.gcube.data.publishing.ckan2zenodo.model.CkanResource;
import org.gcube.data.publishing.ckan2zenodo.model.DownloadedFile;
import org.gcube.data.publishing.ckan2zenodo.model.zenodo.FileDeposition;
import org.gcube.data.publishing.ckan2zenodo.model.zenodo.ZenodoDeposition;

import lombok.extern.slf4j.Slf4j;


@Slf4j
public class UploadFilesCall implements Callable<ZenodoDeposition>{

	private Collection<CkanResource> toUpload;
	private ZenodoDeposition deposition;
	private Zenodo z;



	public UploadFilesCall(Collection<CkanResource> toUpload, ZenodoDeposition deposition,
			Zenodo z) {
		super();
		this.toUpload = toUpload;
		this.deposition = deposition;
		this.z = z;
	}



	@Override
	public ZenodoDeposition call() throws Exception {
		ZenodoDeposition dep=deposition;

		log.debug("Starting file transfer for deposition "+deposition.getTitle()+" id : "+deposition.getId());

		log.debug("Removing not referenced files..");

		HashMap<String,DownloadedFile> resourceMap=new HashMap<>();
		for(CkanResource r:toUpload) {
			DownloadedFile d=new DownloadedFile(r);
			resourceMap.put(d.getToUseFileName(),d);
		}
		Set<String> alreadyExistingFiles=new HashSet<>();

		for(FileDeposition f:dep.getFiles()) {
			CkanResource found=null;
			if(resourceMap.containsKey(f.getFilename())){
				alreadyExistingFiles.add(f.getFilename());
				try{
					// check for update
					DownloadedFile downloaded = resourceMap.get(f.getFilename());
					if(!downloaded.getMD5().equals(f.getChecksum())) {
						log.debug("MD5 differ, going to update : "+downloaded+" - "+f);
						z.deleteFile(dep, f);
						z.uploadFile(dep, found.getName(), downloaded.getFile());
					}
				}catch (Throwable t){
					log.warn("Unable to update "+f,t);
				}
			}else {
				try{
				// remove File not present in current toUpload set
					log.debug("Remote file "+f+" is not in requested set. Deleting it..");
					z.deleteFile(dep, f);
				}catch(Throwable t) {
					log.warn("Unable to delete "+f,t);
				}
			}
		}


		log.debug("Going to push additional resources for "+deposition.getTitle()+" ID : "+deposition.getId());				

		for(Map.Entry<String,DownloadedFile> e : resourceMap.entrySet()){
					DownloadedFile downloadedFile=e.getValue();
					if(!alreadyExistingFiles.contains(e.getKey()))
			try{
					// Upload new file
					z.uploadFile(dep,downloadedFile.getToUseFileName(),downloadedFile.getFile());
			}catch(Throwable t) {
				log.warn("Unable to upload "+downloadedFile.getSource().getName(),t);
			}
		}

		return z.readDeposition(dep.getId());
	}


}