package vwl.presentation;

import java.net.*;
import org.w3c.dom.html.*;
import com.lutris.xml.xmlc.*;
import com.lutris.util.*;
import com.lutris.appserver.server.Enhydra;
import com.lutris.appserver.server.httpPresentation.*;
import com.lutris.appserver.server.session.SessionData;
import com.lutris.dods.builder.generator.query.*;
import com.lutris.logging.*;
import vwl.data.*;
import vwl.business.*;

public class Winzer implements HttpPresentation {

  private static final String SESSION_KEY="Winzer_key",
    EVENT="event",
    NAME="name",
    LAND="land",
    REGION="region",
    NOTIZ="notiz",
    EVENT_EMPTY="showEmpty",
    EVENT_ADD="processAdd",
    EVENT_RETRY="retry";

  private Data iData = new Data();
  private HttpPresentationComms iComms;

  public void run(HttpPresentationComms comms) 
                                        throws HttpPresentationException {    
    iComms = comms;
    String event = iComms.request.getParameter(EVENT);
    if (event == null)
      showEmptyPage();
    else if (event.equals(EVENT_ADD))
      processAdd();
    else if (event.equals(EVENT_RETRY))
      processRetry();
    else
      showEmptyPage();
  }

  private void showEmptyPage() throws HttpPresentationException {
    WinzerHTML page = new WinzerHTMLImpl();
    clearForm(page);
    iComms.response.writeHTML(page);
  }

  private void processRetry() throws HttpPresentationException {
    WinzerHTML page = new WinzerHTMLImpl();
    clearForm(page);
    fillForm(page);
    iComms.response.writeHTML(page);
  }

  private void clearForm(WinzerHTML page) {
    HTMLInputElement ie = (HTMLInputElement) page.getElementWinzerName();
    ie.setValue("");
    ie = (HTMLInputElement) page.getElementWinzerLand();
    ie.setValue("");
    ie = (HTMLInputElement) page.getElementWinzerRegion();
    ie.setValue("");
    HTMLTextAreaElement tae = (HTMLTextAreaElement) page.getElementWinzerNotiz();
    tae.getFirstChild().setNodeValue("");
  }

  private void fillForm(WinzerHTML page) throws HttpPresentationException {
    try {
      iData = (Data) iComms.session.getSessionData().get(SESSION_KEY);
    } catch (Exception e) {
      iData = new Data();
    }
    HTMLInputElement ie;
    if (iData.iName != null) {
      ie = (HTMLInputElement) page.getElementWinzerName();
      ie.setValue(iData.iName);
    }
    if (iData.iLand != null) {
      ie = (HTMLInputElement) page.getElementWinzerLand();
      ie.setValue(iData.iLand);
    }
    if (iData.iRegion != null) {
      ie = (HTMLInputElement) page.getElementWinzerRegion();
      ie.setValue(iData.iRegion);
    }
    if (iData.iNotiz != null) {
      HTMLTextAreaElement tae =
        (HTMLTextAreaElement) page.getElementWinzerNotiz();
      tae.getFirstChild().setNodeValue(iData.iNotiz);
    }
  }

  private void processAdd() throws HttpPresentationException {
    try {
      readParams();
      WinzerBO winzer = new WinzerBO();
      winzer.setName(iData.iName);
      winzer.setLand(iData.iLand);
      if (iData.iRegion != null)
   winzer.setRegion(iData.iRegion);
      if (iData.iNotiz != null)
   winzer.setNotiz(iData.iNotiz);
      winzer.commit();
      writeRes("Datensatz erfolgreich geschrieben");
     } catch (RefAssertionException rae) {
       Throwable t = rae.getCause();
       if (t instanceof IncompleteDataException)
    writeRes("Daten fehlen!");
       else if (t instanceof NonUniqueDataException)
    writeRes("Winzer innerhalb der Region schon vorhanden!");
       else
    writeRes(t.getMessage());
    } catch (Exception e) {
      writeRes(e.getMessage());
    }      
  } 

  private void readParams() throws HttpPresentationException,
                                                         KeywordValueException {
    iData.iName   = iComms.request.getParameter(NAME);
    iData.iLand   = iComms.request.getParameter(LAND);
    iData.iRegion = iComms.request.getParameter(REGION);
    iData.iNotiz  = iComms.request.getParameter(NOTIZ);
    iComms.session.getSessionData().set(SESSION_KEY,iData);
  }

  private void writeRes(String msg) throws HttpPresentationException {
    WinzerOkHTML page = new WinzerOkHTMLImpl();
    page.setTextWinzerOkH2(msg);
    if (iData.iName != null) {
      page.setTextWinzerOkName(iData.iName);
    }
    if (iData.iLand != null) {
      page.setTextWinzerOkLand(iData.iLand);
    }
    if (iData.iRegion != null) {
      page.setTextWinzerOkRegion(iData.iRegion);
    }
    if (iData.iNotiz != null) {
      page.setTextWinzerOkNotiz(iData.iNotiz);
    }
    iComms.response.writeHTML(page);
  }

  static class Data {
    protected String iName, iLand, iRegion, iNotiz;
  }
}