package org.dive4elements.river.backend;

import java.util.List;

import org.apache.log4j.Logger;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;

import org.dive4elements.river.model.Building;
import org.dive4elements.river.model.CrossSectionTrack;
import org.dive4elements.river.model.Fixpoint;
import org.dive4elements.river.model.River;
import org.dive4elements.river.model.RiverAxis;
import org.dive4elements.river.model.HWSLine;


public class SpatialInfo {

    private static Logger logger = Logger.getLogger(SpatialInfo.class);

    protected static String RIVERNAME = System.getProperty(
        "flys.backend.spatial.river", "Saar");

    protected Session session;


    public static void main(String[] args) {
        logger.info("Start SpatialInfo application.");

        SpatialInfo spatial = null;

        try {
            spatial = new SpatialInfo();

            River river = spatial.getRiver(RIVERNAME);
            if (river == null) {
                logger.warn("Could not find river '" + RIVERNAME + "'!");
                return;
            }

            logger.info("Spatial information of River '" + RIVERNAME + "'");
            spatial.doRiverAxisInfo(river);
            spatial.doCrossSectionTracksInfo(river);
            spatial.doBuildingsInfo(river);
            spatial.doFixpointsInfo(river);
        }
        finally {
            if (spatial != null) {
                spatial.close();
            }
        }

        logger.info("Finish SpatialInfo application.");
    }


    public SpatialInfo() {
        session = SessionFactoryProvider
            .createSessionFactory()
            .openSession();
    }


    public void close() {
        session.close();
    }


    protected River getRiver(String rivername) {
        Query query = session.createQuery(
            "from River where name =:name");
        query.setParameter("name", rivername);

        List<River> list = query.list();

        if (list == null || list.size() == 0) {
            logger.warn("No river '" + rivername + "' found!");
            return null;
        }

        return list.get(0);
    }


    protected void doRiverAxisInfo(River river) {
        try {
            List<RiverAxis> axis = RiverAxis.getRiverAxis(river.getName());
            if (axis != null && axis.size() > 0) {
                logger.debug("TODO: Compute length and boundary.");
            }
            else {
                logger.warn("River has no RiverAxis.");
            }
        }
        catch(HibernateException iae) {
            logger.warn("No vaild river axis found for " + river.getName());
            return;
        }

    }


    protected void doCrossSectionTracksInfo(River river) {
        Query query = session.createQuery(
            "from CrossSectionTrack where river =:river");
        query.setParameter("river", river);

        List<CrossSectionTrack> list = query.list();

        if (list == null || list.size() == 0) {
            logger.warn("No CrossSectionTracks for '" + river.getName() + "' found!");
            return;
        }
        else {
            logger.info("River contains " + list.size() + " CrossSectionTracks.");
        }
    }


    protected void doBuildingsInfo(River river) {
        Query query = session.createQuery(
            "from Building where river =:river");
        query.setParameter("river", river);

        List<Building> list = query.list();

        if (list == null || list.size() == 0) {
            logger.warn("No Buildings for '" + river.getName() + "' found!");
            return;
        }
        else {
            logger.info("River contains " + list.size() + " Buildings.");
        }
    }


    protected void doFixpointsInfo(River river) {
        Query query = session.createQuery(
            "from Fixpoint where river =:river");
        query.setParameter("river", river);

        List<Fixpoint> list = query.list();

        if (list == null || list.size() == 0) {
            logger.warn("No Fixpoints for '" + river.getName() + "' found!");
            return;
        }
        else {
            logger.info("River contains " + list.size() + " Fixpoints.");
        }
    }

    @Deprecated
    protected void doLinesInfo(River river) {
        doHWSLinesInfo(river);
    }

    protected void doHWSLinesInfo(River river) {
        Query query = session.createQuery(
            "from hws_lines where river =:river");
        query.setParameter("river", river);

        List<HWSLine> list = query.list();

        if (list == null || list.size() == 0) {
            logger.warn("No Lines for '" + river.getName() + "' found!");
            return;
        }
        else {
            logger.info("River contains " + list.size() + " Lines.");
        }
    }
}
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