package org.msh.tb.application;

import org.jboss.seam.Component;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Transactional;
import org.jboss.seam.annotations.async.Asynchronous;
import org.jboss.seam.contexts.Contexts;
import org.jboss.seam.faces.Renderer;
import org.msh.tb.entities.ErrorLog;
import org.msh.tb.entities.SystemConfig;
import org.msh.tb.entities.User;
import org.msh.tb.entities.UserLogin;
import org.msh.tb.misc.DmSystemHome;

import javax.persistence.EntityManager;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;

/**
 * Register information about exceptions and its associated user session and
 * dispatch an e-mail message to the administrators about it.
 *
 * @author Ricardo Memoria
 *
 */
@Name("systemErrorDispatcher")
public class SystemErrorDispatcher {

    @In(create=true)
    DmSystemHome dmsystem;

    @In(create=true)
    EtbmanagerApp etbmanagerApp;

    private ErrorLog errorLog;

    /**
     * Register the exception in the database and send an e-mail message to the system administrators
     * (registered in the system settings)
     *
     * @param exception is the exception thrown
     * @param userLogin instance of the {@link UserLogin} containing information about the user session
     * @param url is the URL that caused the error
     * @param request additional information about the error
     */
    @Asynchronous
    @Transactional
    public void dispatch(Exception exception, UserLogin userLogin, String url, String request) {

        EntityManager entityManager = (EntityManager)Component.getInstance("entityManager");

        errorLog = new ErrorLog();
        errorLog.setErrorDate(new Date());
        errorLog.setExceptionClass(exception.getClass().getName());
        String s = exception.getMessage();
        if (s == null)
            s = "-No message in exception-";
        else if (s.length() > 200) s = s.substring(0, 199);
        errorLog.setExceptionMessage(s);
        StringWriter writer = new StringWriter();
        PrintWriter pw = new PrintWriter(writer);
        exception.printStackTrace(pw);
        errorLog.setStackTrace(writer.toString());
        errorLog.setUrl(url);
        errorLog.setRequest(request);

        if (userLogin != null) {
            User user = userLogin.getUser();
            errorLog.setUser(user.getLogin() + " - " + user.getName());
            errorLog.setUserId(user.getId());
            errorLog.setWorkspace(userLogin.getWorkspace().getName().toString());
        }

        entityManager.persist(errorLog);
        entityManager.flush();

        // check if eTB Manager is in development mode. If so, doesn't send the message
        if (!etbmanagerApp.isDevelopmentMode()) {
            SystemConfig systemConfig = etbmanagerApp.getConfiguration();

            String destMails = systemConfig.getAdminMail();

            if ((destMails != null) && (!destMails.isEmpty())) {
                String[] dests = destMails.split("[;,]+");
                for (String dest: dests) {
                    Contexts.getEventContext().set("adminMail", dest);
                    Renderer.instance().render("/mail/systemerror.xhtml");
                }
            }
        }
    }

    /**
     * @return the errorLog
     */
    public ErrorLog getErrorLog() {
        return errorLog;
    }

    /**
     * @param errorLog the errorLog to set
     */
    public void setErrorLog(ErrorLog errorLog) {
        this.errorLog = errorLog;
    }

}