// $Id$
// $HeadURL$
// $Author$
// Created by Manfred Gronak, , 2021-05

var fs = require("fs");
var parser = require('xml2json');

module.exports = function() {

  this.VwmXmlToWrl = function VwmXmlToWrl(OriginalxmlFile) {
    console.log(" VwmXmlToWrl: "+ OriginalxmlFile); // Datei geschrieben

//     if (OriginalxmlFile.includes("bldg_1287.flt.VWM_Building.xml")) {
//       console.log(" Skip VwmXmlToWrl: "+ OriginalxmlFile); // Datei geschrieben
//     } else {
//       return;
//     }



    var coordIndex = "]\n}\ncoordIndex [ ";
    var counter = 0;

    var wrl_filename = OriginalxmlFile + ".wrl";

    var content = fs.readFileSync(OriginalxmlFile);
    var jsonFileInhalt = parser.toJson(content);
    var jsonContent = JSON.parse(jsonFileInhalt);
    var i;

    var resultfile = "#VRML V2.0 utf8\nBackground {\nskyColor 0.2 0.3 0.1}\nTransform {\ntranslation -2.5 -2.5 -2.5\n"
    resultfile = resultfile + "children [\n Shape {\nappearance Appearance {\nmaterial Material {\n";
    resultfile = resultfile + "diffuseColor 1 0 1\n}\n}\ngeometry IndexedFaceSet {\nsolid FALSE\n";
    resultfile = resultfile + "coord Coordinate {\npoint [\n";

    var RoomArray = jsonContent.BuildingVulnerability.Rooms.Room;
    if (RoomArray == null) {
      console.log("Datei " + OriginalxmlFile + ": " + " WARNING, no RoomArray detected");
      return;
    }

    if (Array.isArray(RoomArray)) {
       // console.log("1Array: ");
    } else {
      // No Array..
      // wrap obj into an array to ensure 'RoomArray.forEach(...'
      var dummy = new Array;
      dummy[0] = RoomArray;
      RoomArray = dummy;
    }



    RoomArray.forEach(Room => {

      var OuterWallArray = Room.RoomOuterWalls.OuterWall;

      if (Array.isArray(OuterWallArray)) {

        OuterWallArray.forEach(Outerwall => {
          // console.log("Array: " + Outerwall.OuterWallAreaElement);
          var n = 0;
          var PolygonPoints = Outerwall.OuterWallAreaElement.PolygonPoint;

          PolygonPoints.forEach(PolygonPoint => {
            // console.log(PolygonPoint.X + " " + PolygonPoint.Y + " " + PolygonPoint.Z) ;
            resultfile = resultfile + PolygonPoint.X + " " + PolygonPoint.Y + " " + PolygonPoint.Z + ",\n";

            n = n + 1;
            counter = counter + 1;
          })

          for (i = counter - n; i < counter; i++) {
            coordIndex = coordIndex + " " + i + ",";
          }
          coordIndex = coordIndex + " -1\n";
        });

      } else {
        // console.log("NoArray: " + OuterWallArray);

        if (OuterWallArray != undefined) {
          // RoomArray is object:
          // that means OuterWallArray could be used as (a single) Outerwall
          // console.log("OBJ" + OuterWallArray);

          var n = 0;
          var PolygonPoints = OuterWallArray.OuterWallAreaElement.PolygonPoint;

          PolygonPoints.forEach(PolygonPoint => {
            // console.log(PolygonPoint.X + " " + PolygonPoint.Y + " " + PolygonPoint.Z) ;
            resultfile = resultfile + PolygonPoint.X + " " + PolygonPoint.Y + " " + PolygonPoint.Z + ",\n";

            n = n + 1;
            counter = counter + 1;
          })

          for (i = counter - n; i < counter; i++) {
            coordIndex = coordIndex + " " + i + ",";
          }
          coordIndex = coordIndex + " -1\n";
        }

      }

    })

    resultfile = resultfile + coordIndex;
    resultfile = resultfile + " ]\n}\n}\n]\n}\n";

    fs.writeFileSync(wrl_filename, resultfile, function(err) {
      // If an error occurred, show it
      if(err)
      {
        console.log("Error on writing file: " + wrl_filename);
        console.err(err);
      }
    });

  } // end of function
} // export