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package org.ufcspa.simdecs.bn.ui;

import java.io.*;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ApplicationScoped;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.transaction.UserTransaction;
import javax.xml.bind.JAXBException;
import org.primefaces.event.FileUploadEvent;
import org.primefaces.model.UploadedFile;
import org.ufcspa.simdecs.bn.entity.BayesianNetwork;
import org.ufcspa.simdecs.bn.entity.Node;
import unbbayes.io.exception.LoadException;
import unbbayes.io.xmlbif.version6.XMLBIFIO;
import unbbayes.prs.bn.ProbabilisticNetwork;

/**
 *
 * @author mchelem
 */
@ManagedBean(name = "fileUploadController")
@ApplicationScoped
public class FileUploadController implements Serializable {
    @Resource
    private UserTransaction utx = null;
    @PersistenceUnit(unitName = "simdecsEclipseLinkPU")
    private EntityManagerFactory emf = null;
    EntityManager em = null;
    
    private static final Logger logger = Logger.getLogger("" + FileUploadController.class);

    private File saveUploadedFile(UploadedFile uploadedFile) throws IOException{
        InputStream in = new BufferedInputStream(uploadedFile.getInputstream()); 
        File file = new File(uploadedFile.getFileName());           
        FileOutputStream fout = new FileOutputStream(file);
        while(in.available() != 0){ 
            fout.write(in.read());
        }
        logger.log(Level.INFO, "Uploaded file saved in: {0}", file.getAbsolutePath());
        return file;            
    }
    
    private void persist(BayesianNetwork bayesianNetwork){
        em = emf.createEntityManager();
        try {
            utx.begin();
            em.persist(bayesianNetwork);           
            utx.commit();
            } catch (Exception e) {
                try {
                    utx.rollback();
                } catch (Exception ex) {
                    Logger.getLogger(FileUploadController.class.getName()).log(Level.SEVERE, null, ex);
                } 
                Logger.getLogger(FileUploadController.class.getName()).log(Level.INFO, null, e);
            }
        logger.log(Level.INFO, "Bayesian Network {0} persisted.", bayesianNetwork.getName());

    }
    
    
    public void handleFileUpload(FileUploadEvent event) {
        try {
            File file = this.saveUploadedFile(event.getFile());            
            // required to run unbbayes gui classes on server
            System.setProperty("java.awt.headless", "false"); 
            
            ProbabilisticNetwork bn = new ProbabilisticNetwork(null);
            XMLBIFIO.loadXML(new File(file.getAbsolutePath()), bn);             
            BayesianNetwork bayesianNetwork = new BayesianNetwork();
            bayesianNetwork.setName(bn.getName());                        
            
            ArrayList<Node> nodes = new ArrayList<Node>();
            for (unbbayes.prs.Node prs_node: bn.getNodes()){
                Node node = new Node();
                node.setName(prs_node.getName());
                node.setBayesianNetwork(bayesianNetwork);
                nodes.add(node);                
            }
            bayesianNetwork.setNodes(nodes);                                          
            persist(bayesianNetwork);
            
            FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
            FacesContext.getCurrentInstance().addMessage(null, msg);
        } catch (LoadException ex) {
            Logger.getLogger(FileUploadController.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(FileUploadController.class.getName()).log(Level.SEVERE, null, ex);
        } catch (JAXBException ex) {
            Logger.getLogger(FileUploadController.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}