import { getProp, parseSequence } from './util'
import { polygon } from '@turf/helpers';
import proj4 from 'proj4';

export const LANDXML_PARCEL = 'parcel';

export function convertParcels(xmlObj, projection, opts) {

  const originalPoints = getProp(xmlObj, "LandXML", "CgPoints", 0, "CgPoint");
  const originalParcels = getProp(xmlObj, "LandXML", "Parcels", 0, "Parcel");

  const points = {}
  const polygons = []

  // Parse out the points
  for ( let pt in originalPoints ) {
    const opt = originalPoints[pt]
    const name = opt.$.name.replace(/ /g,'');
    let coords = parseSequence(opt._).map(coord => parseFloat(coord))
    coords = [coords[1], coords[0]]
    coords = proj4(projection, 'WGS84', coords)
    points[name] = coords
  }

  // Parse out the parcels
  for ( let pc in originalParcels) {
      var opc = originalParcels[pc]
      var geom = opc.CoordGeom
      if (geom !== undefined) {
          let coords = []
          // Need to store the start to add at the end
          var endCoord = null
          var origCoords = opc.CoordGeom[0].Line

          for (let oc in origCoords) {
              // VERY important note. This code does NOT handle the other two types
              // of coordinate definitions, curves and irregular lines. TODO: fixme.
              var start = origCoords[oc].Start[0].$.pntRef

              // We don't use the end (it probably should be checked, because if the end isn't the start)
              var end = origCoords[oc].End[0].$.pntRef

              var startPoint = points[start]
              if (!startPoint) {
                  // console.log('Failed to get start point', start, startPoint)
              } else {
                  // Start creating the polygon
                  coords.push(points[start])
                  if (!endCoord) {
                      // Store the first coord, to put back on to close the polygon
                      endCoord = points[start]
                  }
              }
          }

          if (coords.length > 2) {
              coords.push(endCoord)
              coords = [coords]
              // name="101" class="Lot" state="proposed"  parcelType="Single"
              var parameters = {
                name: opc.$.name,
                landxmlClass: opc.$.class,
                landxmlState: opc.$.state,
                landxmlParcelType: opc.$.parcelType,
                landxmlType: LANDXML_PARCEL,
              }
              polygons.push(polygon(coords, parameters))
          } else {
              // console.log("Couldn't create a polygon because we found less than 2 coords")
          }
      } else {
          // console.log("No geometry")
      }
  }

  return polygons;

}