package de.intevation.flys.artifacts.model.minfo;


import java.util.List;

import net.sf.ehcache.Cache;
import net.sf.ehcache.Element;

import org.apache.log4j.Logger;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.type.StandardBasicTypes;

import de.intevation.flys.artifacts.cache.CacheFactory;
import de.intevation.flys.artifacts.model.StaticBedHeightCacheKey;
import de.intevation.flys.backend.SessionHolder;

public class BedHeightFactory {
    /** Private logger to use here. */
    private static Logger log = Logger.getLogger(BedHeightFactory.class);

    /** Query to get km and ws for wst_id and column_pos. */
    public static final String SQL_SELECT_SINGLE =
        "SELECT height, station, data_gap FROM bed_height_single_values " +
        "WHERE id = :height_id";

    /** Query to get name for wst_id and column_pos. */
    public static final String SQL_SELECT_EPOCH =
        "SELECT height, station FROM bed_height_epoch_values "+
        "WHERE id = :height_id";

    /** Query to get name (description) for wst_id. */
    public static final String SQL_SELECT_DESCR_SINGLE =
        "SELECT description FROM bed_height_single "+
        "WHERE id = :height_id";

    /** Query to get name (description) for wst_id. */
    public static final String SQL_SELECT_DESCR_EPOCH =
        "SELECT description from bed_height_epoch "+
        "WHERE id = :height_id";


    private BedHeightFactory() {
    }


    /**
     * Get WKms for given column and wst_id, caring about the cache.
     */
    public static BedHeight getHeight(String type, int height_id, int time) {
        log.debug("BedHeightFactory.getHeight");
        Cache cache = CacheFactory.getCache(StaticBedHeightCacheKey.CACHE_NAME);

        StaticBedHeightCacheKey cacheKey;

        if (cache != null) {
            cacheKey = new StaticBedHeightCacheKey(height_id, time);
            Element element = cache.get(cacheKey);
            if (element != null) {
                log.debug("Got static bedheight values from cache");
                return (BedHeight)element.getValue();
            }
        }
        else {
            cacheKey = null;
        }

        BedHeight values = getBedHeightUncached(type, height_id, time);

        if (values != null && cacheKey != null) {
            log.debug("Store static bed height values in cache.");
            Element element = new Element(cacheKey, values);
            cache.put(element);
        }
        return values;
    }

    /** Get name for a WKms. */
    public static String getHeightName(String type, int height_id) {
        log.debug("BedHeightFactory.getHeightName height_id/" + height_id);

        String name = null;
        Session session = SessionHolder.HOLDER.get();

        SQLQuery nameQuery = null;
        if (type.equals("single")) {
            nameQuery = session.createSQLQuery(SQL_SELECT_DESCR_SINGLE)
                .addScalar("description", StandardBasicTypes.STRING);
            nameQuery.setInteger("height_id", height_id);
        }
        else if (type.equals("epoch")) {
            nameQuery = session.createSQLQuery(SQL_SELECT_DESCR_EPOCH)
                .addScalar("description", StandardBasicTypes.STRING);
            nameQuery.setInteger("height_id", height_id);
        }
        else {
            return "none";
        }
        List<String> names = nameQuery.list();
        if (names.size() >= 1) {
            name = names.get(0);
        }

        return name;
    }


    /**
     * Get WKms from db.
     * @param column the position columns value
     * @param wst_id database id of the wst
     * @return according WKms.
     */
    public static BedHeight getBedHeightUncached(
        String type,
        int height_id,
        int time)
    {
        if (log.isDebugEnabled()) {
            log.debug("BedHeightFactory.getBedHeightUncached");
        }

        BedHeight height = new BedHeight(getHeightName(type, height_id));

        Session session = SessionHolder.HOLDER.get();
        SQLQuery sqlQuery = null;
        if (type.equals("single")) {
            sqlQuery = session.createSQLQuery(SQL_SELECT_SINGLE)
                .addScalar("height", StandardBasicTypes.DOUBLE)
                .addScalar("station", StandardBasicTypes.DOUBLE)
                .addScalar("data_gap", StandardBasicTypes.DOUBLE);
            sqlQuery.setInteger("height_id", height_id);
            List<Object []> results = sqlQuery.list();

            for (int i = 0; i <= results.size(); i++) {
                Object[] row = results.get(i);
                height.add((Double) row[0], (Double) row[1], (Double) row[2]);
            }
        }
        else if (type.equals("epoch")) {
            sqlQuery = session.createSQLQuery(SQL_SELECT_EPOCH)
                .addScalar("height", StandardBasicTypes.DOUBLE)
                .addScalar("station", StandardBasicTypes.DOUBLE);
            sqlQuery.setInteger("height_id", height_id);
            List<Object []> results = sqlQuery.list();

            for (int i = 0; i <= results.size(); i++) {
                Object[] row = results.get(i);
                height.add((Double) row[0], (Double) row[1], 0);
            }
        }

        return height;
    }
}
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