/**
 *
 */
package de.intevation.gnv.transition;

import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;


import org.apache.log4j.Logger;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import de.intevation.artifactdatabase.Config;
import de.intevation.artifacts.CallMeta;
import de.intevation.gnv.artifacts.cache.CacheFactory;
import de.intevation.gnv.geobackend.base.Result;
import de.intevation.gnv.geobackend.base.query.QueryExecutor;
import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
import de.intevation.gnv.geobackend.base.query.exception.QueryException;
import de.intevation.gnv.transition.exception.TransitionException;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 * 
 */
public abstract class OutputTransitionBase extends TransitionBase implements
                                                                 OutputTransition {

    /**
     * The UID of this Class
     */
    private static final long serialVersionUID = -1718732895737303823L;

    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(OutputTransitionBase.class);

    /**
     * The different Outputmodes which are provided by an OutputTransition
     */
    protected Collection<OutputMode> outputModes = null;
    
    protected String queryODVID = null;

    /**
     * Constructor
     */
    public OutputTransitionBase() {
        super();
    }

    /**
     * @see de.intevation.gnv.transition.OutputTransition#getOutputModes()
     */
    public Collection<OutputMode> getOutputModes() {
        log.debug("OutputTransitionBase.getOutputModes");
        return this.outputModes;
    }

    /**
     * @see de.intevation.gnv.transition.TransitionBase#setup(org.w3c.dom.Node)
     */
    @Override
    public void setup(Node configuration) {
        log.debug("OutputTransitionBase.setup");
        super.setup(configuration);
        
        this.queryODVID = Config.getStringXPath(configuration,"queryID-odv");
        
        NodeList outputModeList = Config.getNodeSetXPath(configuration,
                "outputsModes/outputsMode");
        if (outputModeList != null) {
            log.debug(outputModeList.getLength() + " were found.");
            this.outputModes = new ArrayList<OutputMode>(outputModeList
                    .getLength());
            for (int i = 0; i < outputModeList.getLength(); i++) {
                Element currentNode = (Element)outputModeList.item(i);
                String name = currentNode.getAttribute("name");
                String description =currentNode.getAttribute("description");
                String mimeType = currentNode.getAttribute("mime-type");
                NodeList inputValuesList = Config.getNodeSetXPath(currentNode,
                        "parameters/inputvalue");
                Collection<InputValue> inputParameters = null;
                if (inputValuesList != null) {
                    inputParameters = new ArrayList<InputValue>(inputValuesList
                            .getLength());
                    for (int j = 0; j < inputValuesList.getLength(); j++) {
                        Element currentInputValuesNode = (Element)inputValuesList.item(j);
                        String inputValueName = currentInputValuesNode.getAttribute("name");
                        String inputValueType = currentInputValuesNode.getAttribute("type");
                        String defaultValue =currentInputValuesNode.getAttribute("value");
                        boolean isMultiselect = false;
                        InputValue inputValue = new DefaultInputValue(
                                inputValueName, inputValueType, defaultValue,
                                isMultiselect);
                        inputParameters.add(inputValue);
                    }
                }

                OutputMode outputMode = new DefaultOutputMode(name,
                        description, mimeType, inputParameters);
                log.debug(outputMode.toString());
                this.outputModes.add(outputMode);

            }
        }
    }

    /**
     * @see de.intevation.gnv.transition.TransitionBase#advance()
     */
    @Override
    public void advance(String uuid, CallMeta callMeta)
                                                       throws TransitionException {
        log.debug("OutputTransitionBase.advance");
        if (this.getChartResult(uuid) == null) {
            super.advance(uuid, callMeta);
        }
    }

    /**
     * @see de.intevation.gnv.transition.OutputTransition#out(java.lang.String,
     *      java.util.Collection, java.io.OutputStream)
     */
    public void out(String outputMode, Collection<InputData> inputData,
                    OutputStream outputStream) throws TransitionException {
    }

    /**
     * @return
     */
    protected Collection<Result> getChartResult(String uuid) {
        log.debug("OutputTransitionBase.getChartResult");
        if (CacheFactory.getInstance().isInitialized()) {
            String key = uuid + super.getID();
            log.debug("Hash for Queryelements: " + key);
            net.sf.ehcache.Element value = CacheFactory.getInstance().getCache().get(key);
            if (value != null) {
                return (Collection<Result>) (value.getObjectValue());
            }
        }
        return null;
    }

    protected Object getChartFromCache(String uuid) {
        log.debug("Fetch chart [" + uuid + "] from cache");
        CacheFactory cacheFactory = CacheFactory.getInstance();
        if (cacheFactory.isInitialized()) {
            String key = "chart_" + uuid + super.getID();
            net.sf.ehcache.Element object = cacheFactory.getCache().get(key);

            if (object != null) {
                return object.getObjectValue();
            }
        }
        return null;
    }
    
    protected Collection<Result> getODVResult(String uuid) {
        log.debug("OutputTransitionBase.getODVResult");
        // TODO add Caching? I think it's not nessessary
        Collection<Result> returnValue = null;
        if (this.queryODVID != null){
            try {
                String[] filterValues = this.generateFilterValuesFromInputData();
                try {
                    QueryExecutor queryExecutor = QueryExecutorFactory
                                                  .getInstance()
                                                  .getQueryExecutor();
                    returnValue  = queryExecutor.executeQuery(this.queryODVID,
                                                              filterValues);
                } catch (RuntimeException e) {
                    log.error(e, e);
                }
            } catch (QueryException e) {
                log.error(e, e);
            }
        }else{
            log.warn("No Query for ODV Data is defined.");
        }
        return returnValue;
    }
    
    protected void removeChartResult(String uuid) {
        log.debug("OutputTransitionBase.getChartResult");
        if (CacheFactory.getInstance().isInitialized()) {
            String key = uuid + super.getID();
            log.debug("Hash for Queryelements: " + key);
            net.sf.ehcache.Element value = CacheFactory.getInstance().getCache().get(key);
            if (value != null) {
                CacheFactory.getInstance().getCache().remove(key);
            }
        }
    }

    /**
     * @see de.intevation.gnv.transition.TransitionBase#purifyResult(java.util.Collection,
     *      java.lang.String)
     */
    @Override
    protected void purifyResult(Collection<Result> result, String uuid) {
        log.debug("OutputTransitionBase.purifyResult");
        if (CacheFactory.getInstance().isInitialized()) {
            String key = uuid + super.getID();
            log.debug("Hash for Queryelements: " + key);
            CacheFactory.getInstance().getCache().put(new net.sf.ehcache.Element(key, result));
        }
    }


    protected void purifyChart(Object chart, String uuid) {
        log.debug("Prufify chart [" + uuid + "]");
        CacheFactory cacheFactory = CacheFactory.getInstance();
        if (cacheFactory.isInitialized()) {
            String key = "chart_" + uuid + getID();
            cacheFactory.getCache().put(new net.sf.ehcache.Element(key, chart));
        }
    }

    /**
     * @see de.intevation.gnv.transition.TransitionBase#putInputData(java.util.Collection, java.lang.String)
     */
    @Override
    public void putInputData(Collection<InputData> inputData, 
                             String uuid)
                                         throws TransitionException {
        log.debug("OutputTransitionBase.putInputData");
        this.removeChartResult(uuid);
        super.putInputData(inputData, uuid);
    }

    public void out(String outputMode, Collection<InputData> inputData,
                    OutputStream outputStream, String uuid, CallMeta callMeta)
                                                                              throws TransitionException {
    }
    
    

}