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/*
License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
$Id: DeleteFeature.js 3052 2007-08-01 21:25:21Z ahocevar $
*/

// Ensure this object's dependancies are loaded.
mapbuilder.loadScript(baseDir+"/widget/ButtonBase.js");

/**
 * When this button is pressed a WFS-T DeleteFeature transaction will be started.
 * @constructor
 * @base ButtonBase
 * @author Cameron Shorter
 * @param widgetNode The widget node from the Config XML file.
 * @param model The model for this widget
 */
function DeleteFeature(widgetNode, model) {
  // Extend ButtonBase
  ButtonBase.apply(this, new Array(widgetNode, model));
  
  // override default cursor by user
  // cursor can be changed by spefying a new cursor in config file
  this.cursor = "default"; 

  this.trm=widgetNode.selectSingleNode("mb:transactionResponseModel").firstChild.nodeValue;
  this.tm=widgetNode.selectSingleNode("mb:targetModel").firstChild.nodeValue;
  this.tc=widgetNode.selectSingleNode("mb:targetContext").firstChild.nodeValue;

  this.httpPayload=new Object();
  this.httpPayload.url=widgetNode.selectSingleNode("mb:webServiceUrl").firstChild.nodeValue;
  this.httpPayload.method="post";

  /** Xsl to convert Feature into a WFS Transaction Delete. */
  this.deleteXsl=new XslProcessor(baseDir+"/tool/xsl/wfs_Delete.xsl");

  /** creates the OL control for this button */
  this.createControl = function(objRef) {
    var Control = OpenLayers.Class(OpenLayers.Control, {
      CLASS_NAME: 'mbDeleteFeature',
      type: OpenLayers.Control.TYPE_BUTTON
    });
    return Control;
  }

  /**
   * Start a WFS-T DeleteFeature transaction.
   * @param objRef Pointer to this object.
   */
  this.doSelect = function(objRef, selected) {
    if (selected){
      // Model that will be populated with the WFS response.
      if (!objRef.transactionResponseModel){
        objRef.transactionResponseModel=window.config.objects[objRef.trm];
        objRef.transactionResponseModel.addListener("loadModel",objRef.handleResponse, objRef);
      }
      if (!objRef.targetModel){
        objRef.targetModel=window.config.objects[objRef.tm];
      }
      if (!objRef.targetContext){
        objRef.targetContext=window.config.objects[objRef.tc];
      }
      fid=objRef.targetModel.getXpathValue(objRef.targetModel,"//@fid");
      //if fid exists, then we are deleting an existing feature.
      if (objRef.targetModel.doc && fid){
        s=objRef.deleteXsl.transformNodeToObject(objRef.targetModel.doc);
        objRef.httpPayload.postData=s;
        objRef.transactionResponseModel.transactionType="delete";
        objRef.transactionResponseModel.newRequest(objRef.transactionResponseModel,objRef.httpPayload);
      }else alert(mbGetMessage("noFeatureToDelete"));
    }
  }

  /**
   * If transaction was sucessful, refresh the map and remove contents of
   * FeatureList.  This function is called after the TransactionResponseModel
   * has been updated.
   * @param objRef Pointer to this object.
   */
  this.handleResponse=function(objRef){
    if (objRef.transactionResponseModel.transactionType=="delete") {
      success=objRef.transactionResponseModel.doc.selectSingleNode("//wfs:TransactionResult/wfs:Status/wfs:SUCCESS");
      if (success){
        // Remove FeatureList if feature entry was successful.
        objRef.targetModel.setModel(objRef.targetModel,null);

        // Repaint GmlRenderers
        objRef.targetModel.callListeners("refreshGmlRenderers");

        // Repaint the WMS layers
        objRef.targetContext.callListeners("refreshWmsLayers");
      }
    }
  }
}