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package es.unex.sextante.parameters;

import java.io.IOException;

import org.kxml2.io.KXmlParser;

import org.kxml2.io.KXmlSerializer;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

import es.unex.sextante.additionalInfo.AdditionalInfo;

import es.unex.sextante.additionalInfo.AdditionalInfoDataObject;

import es.unex.sextante.additionalInfo.AdditionalInfoVectorLayer;

import es.unex.sextante.dataObjects.I3DRasterLayer;

import es.unex.sextante.dataObjects.IRasterLayer;

import es.unex.sextante.dataObjects.ITable;

import es.unex.sextante.dataObjects.IVectorLayer;

import es.unex.sextante.exceptions.NullParameterAdditionalInfoException;

import es.unex.sextante.exceptions.NullParameterValueException;

import es.unex.sextante.exceptions.WrongParameterTypeException;

/**

 * A parameter representing a vector layer

 *

 * @author volaya

 *

 */

public class ParameterVectorLayer

         extends

            ParameterDataObject {

   private static final String TYPE = "shape_type";

   @Override

   public String getParameterTypeName() {

      return "Vector Layer";

   }

   @Override

   public IRasterLayer getParameterValueAsRasterLayer() throws WrongParameterTypeException {

      throw new WrongParameterTypeException();

   }

   @Override

   public I3DRasterLayer getParameterValueAs3DRasterLayer() throws WrongParameterTypeException {

      throw new WrongParameterTypeException();

   }

   @Override

   public ITable getParameterValueAsTable() throws WrongParameterTypeException {

      throw new WrongParameterTypeException();

   }

   @Override

   public IVectorLayer getParameterValueAsVectorLayer() throws NullParameterValueException {

      if (m_ParameterValue != null) {

         return (IVectorLayer) m_ParameterValue;

      }

      if (((AdditionalInfoVectorLayer) m_ParameterAdditionalInfo).getIsMandatory()) {

         throw new NullParameterValueException();

      }

      else {

         return null;

      }

   }

   @Override

   public boolean setParameterAdditionalInfo(final AdditionalInfo additionalInfo) {

      if (additionalInfo instanceof AdditionalInfoVectorLayer) {

         m_ParameterAdditionalInfo = additionalInfo;

         return true;

      }

      else {

         return false;

      }

   }

   @Override

   public boolean setParameterValue(final Object value) {

        if (value instanceof IVectorLayer) {

            final AdditionalInfoVectorLayer ai = (AdditionalInfoVectorLayer) m_ParameterAdditionalInfo;

            if (ai.isAvailableForShapeType(((IVectorLayer) value).getShapeType())) {

                m_ParameterValue = value;

                return true;

            } else {

                return false;

            }

        }

      else if (value == null) {

         if (((AdditionalInfoVectorLayer) m_ParameterAdditionalInfo).getIsMandatory()) {

            return false;

         }

         else {

            m_ParameterValue = null;

            return true;

         }

      }

      else {

         return false;

      }

   }

   @Override

   public Class getParameterClass() {

      return IVectorLayer.class;

   }

   @Override

   protected void serializeAttributes(final KXmlSerializer serializer) throws NullParameterAdditionalInfoException, IOException {

      super.serializeAttributes(serializer);

      final AdditionalInfoVectorLayer aivl = (AdditionalInfoVectorLayer) m_ParameterAdditionalInfo;

      if (aivl != null) {

         serializer.text("\n");

         serializer.text("\t\t\t");

         serializer.startTag(null, ATTRIBUTE);

         serializer.attribute(null, NAME, TYPE);

         serializer.attribute(null, VALUE, new Integer(aivl.getShapeType()).toString());

         serializer.endTag(null, ATTRIBUTE);

      }

      else {

         throw new NullParameterAdditionalInfoException();

      }

   }

   public static Parameter deserialize(final KXmlParser parser) throws XmlPullParserException, IOException {

      boolean bMandatory = false;

      int iShapeType = 0;

      int tag = parser.nextTag();

      boolean bOver = false;

      while (!bOver) {

         switch (tag) {

            case XmlPullParser.START_TAG:

               if (parser.getName().compareTo(ATTRIBUTE) == 0) {

                  final String sName = parser.getAttributeValue("", NAME);

                  if (sName.compareTo(MANDATORY) == 0) {

                     bMandatory = parser.getAttributeValue("", VALUE).equals("true");

                  }

                  else if (sName.compareTo(TYPE) == 0) {

                     iShapeType = Integer.parseInt(parser.getAttributeValue("", VALUE));

                  }

               }

               break;

            case XmlPullParser.END_TAG:

               if (parser.getName().compareTo(INPUT) == 0) {

                  bOver = true;

               }

               break;

            case XmlPullParser.TEXT:

               break;

         }

         if (!bOver) {

            tag = parser.next();

         }

      }

      final ParameterVectorLayer param = new ParameterVectorLayer();

      final AdditionalInfoVectorLayer ai = new AdditionalInfoVectorLayer(iShapeType, bMandatory);

      param.setParameterAdditionalInfo(ai);

      return param;

   }

   @Override

   public String getCommandLineParameter() {

      final IVectorLayer layer = (IVectorLayer) m_ParameterValue;

      if (layer == null) {

         return "\"#\"";

      }

      else {

         return "\"" + layer.getName() + "\"";

      }

   }

   @Override

   public boolean isParameterValueCorrect() {

      final AdditionalInfoDataObject aido = (AdditionalInfoDataObject) m_ParameterAdditionalInfo;

      if (m_ParameterValue == null) {

         return !aido.getIsMandatory();

      }

      else {

         return true;

      }

   }

}