using System;
using System.Runtime.InteropServices;
using NUnit.Framework;
using General.tests;
using System.IO;
using System.Linq;
using System.Threading;

//To compile and run this test you add NUnit to your visual studio solution and 
// enable the build in configuration manager
// todo: enable pre-build events to generate the version number

namespace gridgeom.Tests
{
    public class ODugrid
    {
        //Constructor loads the library
        static ODugrid()
        {
            string filename = TestHelper.GetLibraryPath(GridGeomLibWrapper.LibDetails.LIB_NAME);
            _gridgeom_libptr = TestHelper.LoadLibrary(filename);
            //we should chek the pointer is not null
            Assert.That(_gridgeom_libptr, Is.Not.Null);

            //load netcdf for reading in meshgeom
            TestHelper.SetSharedPath(GridGeomLibWrapper.LibDetails.NETCDF_DEP);
            filename = TestHelper.GetLibraryPath(GridGeomLibWrapper.LibDetails.NETCDF_LIB_NAME);
            _netcdf_libptr = TestHelper.LoadLibrary(filename);
            Assert.That(_netcdf_libptr, Is.Not.Null);
        }

        //pointer to the loaded dll
        public static IntPtr _gridgeom_libptr;
        //pointer to the loaded dll
        public static IntPtr _netcdf_libptr;

        private void getMeshid(int ioncid, ref int meshid, int meshType, ref IoNetcdfLibWrapper wrapper)
        {
            // get the number meshes 
            int numMeshes = -1;
            int ierr = wrapper.ionc_get_number_of_meshes(ref ioncid, ref meshType, ref numMeshes);
            Assert.That(ierr, Is.EqualTo(0));
            Assert.That(numMeshes, Is.EqualTo(1));
            // get the mesh id
            IntPtr c_meshids = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * numMeshes);
            ierr = wrapper.ionc_ug_get_mesh_ids(ref ioncid, ref meshType, ref c_meshids, ref numMeshes);
            Assert.That(ierr, Is.EqualTo(0));
            int[] rc_meshids = new int[numMeshes];
            Marshal.Copy(c_meshids, rc_meshids, 0, numMeshes);
            meshid = rc_meshids[0];
            Marshal.FreeCoTaskMem(c_meshids);
        }

        [Test]
        [NUnit.Framework.Category("ougridTests")]
        public void convert1DUgridToXY()
        {
            //dimension info
            int nmeshpoints = 10;
            int nbranches = 3;
            int ngeopoints = 9;
            int jsferic = 0;

            //branches info
            double[] branchlengths = { 4.0, 3.0, 3.0 };
            int[] nbranchgeometrynodes = { 3, 3, 3 };

            //geometry info
            double[] geopointsX = { 1.0, 3.0, 5.0, 5.0, 5.0, 5.0, 5.0, 7.0, 8.0 };
            double[] geopointsY = { 4.0, 4.0, 4.0, 1.0, 2.0, 4.0, 4.0, 4.0, 4.0 };

            //mesh geometry
            int[] branchids = { 1, 1, 1, 1, 2, 2, 2, 3, 3, 3 };
            double[] branchoffsets = { 0.0, 2.0, 3.0, 4.0, 0.0, 1.5, 3.0, 0.0, 1.5, 3.0 };

            // Create the netcdf files
            double[] meshXCoords = { 1.0, 3.0, 4.0, 5.0, 5.0, 5.0, 5.0, 5.0, 6.5, 8.0 };
            double[] meshYCoords = { 4.0, 4.0, 4.0, 4.0, 1.0, 2.5, 4.0, 4.0, 4.0, 4.0 };

            IntPtr c_branchids = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nmeshpoints);
            IntPtr c_branchoffsets = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_geopointsX = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * ngeopoints);
            IntPtr c_geopointsY = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * ngeopoints);
            IntPtr c_nbranchgeometrynodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nbranches);
            IntPtr c_branchlengths = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nbranches);
            IntPtr c_meshXCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_meshYCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            try
            {
                var wrapper = new GridGeomLibWrapper();
                Marshal.Copy(branchids, 0, c_branchids, nmeshpoints);
                Marshal.Copy(branchoffsets, 0, c_branchoffsets, nmeshpoints);
                Marshal.Copy(geopointsX, 0, c_geopointsX, ngeopoints);
                Marshal.Copy(geopointsY, 0, c_geopointsY, ngeopoints);
                Marshal.Copy(nbranchgeometrynodes, 0, c_nbranchgeometrynodes, nbranches);
                Marshal.Copy(branchlengths, 0, c_branchlengths, nbranches);

                //call the function and assert for validity 
                int ierr = wrapper.ggeo_get_xy_coordinates(ref c_branchids, ref c_branchoffsets, ref c_geopointsX,
                    ref c_geopointsY, ref c_nbranchgeometrynodes, ref c_branchlengths, ref c_meshXCoords,
                    ref c_meshYCoords, ref jsferic, ref nbranches, ref ngeopoints, ref nmeshpoints);
                Assert.That(ierr, Is.EqualTo(0));

                double[] rc_meshXCoords = new double[nmeshpoints];
                double[] rc_meshYCoords = new double[nmeshpoints];
                Marshal.Copy(c_meshXCoords, rc_meshXCoords, 0, nmeshpoints);
                Marshal.Copy(c_meshYCoords, rc_meshYCoords, 0, nmeshpoints);

                // check conversion is correct
                for (int i = 0; i < nmeshpoints; i++)
                {
                    Assert.That(rc_meshXCoords[i], Is.EqualTo(meshXCoords[i]));
                    Assert.That(rc_meshYCoords[i], Is.EqualTo(meshYCoords[i]));
                }
            }
            finally
            {
                Marshal.FreeCoTaskMem(c_branchids);
                Marshal.FreeCoTaskMem(c_branchoffsets);
                Marshal.FreeCoTaskMem(c_geopointsX);
                Marshal.FreeCoTaskMem(c_geopointsY);
                Marshal.FreeCoTaskMem(c_nbranchgeometrynodes);
                Marshal.FreeCoTaskMem(c_branchlengths);
                Marshal.FreeCoTaskMem(c_meshXCoords);
                Marshal.FreeCoTaskMem(c_meshYCoords);
            }
        }

        [Test]
        [NUnit.Framework.Category("ougridTests")]
        public void LargeNumberOfPoints()
        {
            //dimension info
            int s_nmeshpoints = 6;
            int s_nbranches   = 2;
            int s_ngeopoints  = 4;
            int repetition    = 100000;
            int jsferic = 0;

            //branches info
            double[] s_branchlengths = { 2.0, 2.0 };
            int[] s_nbranchgeometrynodes = { 2, 2 };

            //geometry info
            double[] s_geopointsX = { 0.0, 2.0, 2.0, 2.0 };
            double[] s_geopointsY = { 0.0, 0.0, 0.0, -2.0 };

            //mesh geometry
            int[] s_branchids = { 1, 1, 1, 2, 2, 2 };
            double[] s_branchoffsets = { 0.0, 1.0, 2.0, 0.0, 1.0, 2.0 };

            //mesh coordinates
            double[] s_meshXCoords = { 0.0, 1.0, 2.0, 2.0, 2.0, 2.0 };
            double[] s_meshYCoords = { 0.0, 0.0, 0.0, 0.0, -1.0, -2.0 };

            //repeat small structure
            int nmeshpoints = s_nmeshpoints * repetition;
            int nbranches = s_nbranches * repetition;
            int ngeopoints = s_ngeopoints * repetition;

            double[] branchlengths = new double[nbranches];
            int[] nbranchgeometrynodes = new int[nbranches];
            double[] geopointsX = new double[ngeopoints];
            double[] geopointsY = new double[ngeopoints];
            int[] branchids = new int[nmeshpoints];
            double[] branchoffsets = new double[nmeshpoints];
            double[] meshXCoords = new double[nmeshpoints];
            double[] meshYCoords = new double[nmeshpoints];

            //generate a large number of point, by repeating the structure above
            int brid = 0;
            int geoid = 0;
            int mid = 0;
            for (int i = 0; i < repetition; i++)
            {

                for (int j = 0; j < s_nbranches; j++)
                {
                    branchlengths[brid] = s_branchlengths[j];
                    nbranchgeometrynodes[brid] = s_nbranchgeometrynodes[j];
                    brid = brid + 1;
                }
                for (int j = 0; j < s_ngeopoints; j++)
                {
                    geopointsX[geoid] = s_geopointsX[j] + i; //add positive offset
                    geopointsY[geoid] = s_geopointsY[j] - i; //add negative offset
                    geoid = geoid + 1;
                }
                for (int j = 0; j < s_nmeshpoints; j++)
                {
                    meshXCoords[mid] = s_meshXCoords[j] + i; //add positive offset
                    meshYCoords[mid] = s_meshYCoords[j] - i; //add negative offset
                    branchids[mid] = s_branchids[j] + i * 2; //add branch ids
                    branchoffsets[mid] = s_branchoffsets[j];
                    mid = mid + 1;
                }
            }

            IntPtr c_branchids = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nmeshpoints);
            IntPtr c_branchoffsets = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_geopointsX = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * ngeopoints);
            IntPtr c_geopointsY = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * ngeopoints);
            IntPtr c_nbranchgeometrynodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nbranches);
            IntPtr c_branchlengths = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nbranches);
            IntPtr c_meshXCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_meshYCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            try
            {
                var wrapper = new GridGeomLibWrapper();
                Marshal.Copy(branchids, 0, c_branchids, nmeshpoints);
                Marshal.Copy(branchoffsets, 0, c_branchoffsets, nmeshpoints);
                Marshal.Copy(geopointsX, 0, c_geopointsX, ngeopoints);
                Marshal.Copy(geopointsY, 0, c_geopointsY, ngeopoints);
                Marshal.Copy(nbranchgeometrynodes, 0, c_nbranchgeometrynodes, nbranches);
                Marshal.Copy(branchlengths, 0, c_branchlengths, nbranches);

                //call the function 
                int ierr = wrapper.ggeo_get_xy_coordinates(ref c_branchids, ref c_branchoffsets, ref c_geopointsX,
                    ref c_geopointsY, ref c_nbranchgeometrynodes, ref c_branchlengths, ref c_meshXCoords, ref c_meshYCoords, ref jsferic, ref nbranches, ref ngeopoints, ref  nmeshpoints);
                Assert.That(ierr, Is.EqualTo(0));

                double[] rc_meshXCoords = new double[nmeshpoints];
                double[] rc_meshYCoords = new double[nmeshpoints];
                Marshal.Copy(c_meshXCoords, rc_meshXCoords, 0, nmeshpoints);
                Marshal.Copy(c_meshYCoords, rc_meshYCoords, 0, nmeshpoints);

                // check conversion is correct
                for (int i = 0; i < nmeshpoints; i++)
                {
                    Assert.That(rc_meshXCoords[i], Is.EqualTo(meshXCoords[i]));
                    Assert.That(rc_meshYCoords[i], Is.EqualTo(meshYCoords[i]));
                }

                ierr = wrapper.ggeo_deallocate();
                Assert.That(ierr, Is.EqualTo(0));

            }
            finally
            {
                Marshal.FreeCoTaskMem(c_branchids);
                Marshal.FreeCoTaskMem(c_branchoffsets);
                Marshal.FreeCoTaskMem(c_geopointsX);
                Marshal.FreeCoTaskMem(c_geopointsY);
                Marshal.FreeCoTaskMem(c_nbranchgeometrynodes);
                Marshal.FreeCoTaskMem(c_branchlengths);
                Marshal.FreeCoTaskMem(c_meshXCoords);
                Marshal.FreeCoTaskMem(c_meshYCoords);
            }
        }

        /// <summary>
        /// Read a netcdf file and populate meshgeom datastructure
        /// </summary>
        [Test]
        [NUnit.Framework.Category("ougridTests")]
        public void createLinksFrom1d2dFile()
        {
            //mesh2d
            int twoddim = 2;
            int twodnumnode = 452;
            int twodnumedge = 825;
            int twodnumface = 375;
            int twodmaxnumfacenodes = 4;
            int twodnumlayer = -1;
            int twodlayertype = -1;
            int jsferic = 0;

            //mesh1d
            int oneddim     = 1;
            int onednumnode = 25;
            int onednumedge = 24;
            int onednumface = 0;
            int onedmaxnumfacenodes = 0;
            int onednumlayer = -1;
            int onedlayertype = -1;
            int nt_nbranches = 1;
            int nt_ngeometry = 25;

            int numnodes = 10;
            int numedge = 1;
            string c_path = TestHelper.TestFilesDirectoryPath() + @"\river1_full_net.nc";
            Assert.IsTrue(File.Exists(c_path));
            int ioncid = 0; //file variable 
            int mode = 0;   //create in read mode
            var wrapperNetcdf = new IoNetcdfLibWrapper();
            int iconvtype = 2;
            double convversion = 0.0;
            var ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
            Assert.That(ierr, Is.EqualTo(0));

            int meshid = -1;
            int meshType = 2;
            int l_networkid = 0; // invalid network, not really intrested in getting the networ
            var meshtwoddim = new meshgeomdim();
            getMeshid(ioncid, ref meshid, meshType, ref wrapperNetcdf);
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref l_networkid, ref meshtwoddim);
            Assert.That(ierr, Is.EqualTo(0));

            Assert.That(meshtwoddim.dim, Is.EqualTo(twoddim));
            Assert.That(meshtwoddim.numnode, Is.EqualTo(twodnumnode));
            Assert.That(meshtwoddim.numedge, Is.EqualTo(twodnumedge));
            Assert.That(meshtwoddim.numface, Is.EqualTo(twodnumface));
            Assert.That(meshtwoddim.maxnumfacenodes, Is.EqualTo(twodmaxnumfacenodes));
            Assert.That(meshtwoddim.numlayer, Is.EqualTo(twodnumlayer));
            Assert.That(meshtwoddim.layertype, Is.EqualTo(twodlayertype));

            //You need to know in advance the number of mesh points
            var meshtwod        = new meshgeom();
            meshtwod.nodex      = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshtwoddim.numnode);
            meshtwod.nodey      = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshtwoddim.numnode);
            meshtwod.nodez      = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshtwoddim.numnode);
            meshtwod.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.numedge * 2);

            //var gridGeomWrapper = new GridGeomLibWrapper();
            bool includeArrays = true;
            int start_index    = 1; //the base index of the arrays
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref  meshid, ref l_networkid, ref meshtwod, ref start_index, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));
            double[] rc_twodnodex = new double[twodnumnode];
            double[] rc_twodnodey = new double[twodnumnode];
            double[] rc_twodnodez = new double[twodnumnode];
            Marshal.Copy(meshtwod.nodex, rc_twodnodex, 0, twodnumnode);
            Marshal.Copy(meshtwod.nodey, rc_twodnodey, 0, twodnumnode);
            Marshal.Copy(meshtwod.nodez, rc_twodnodez, 0, twodnumnode);

            // mesh1d 
            var meshoneddim = new meshgeomdim();
            meshType = 1;
            int meshonedid = -1;
            getMeshid(ioncid, ref meshonedid, meshType, ref wrapperNetcdf);
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshonedid, ref l_networkid, ref meshoneddim);
            Assert.That(ierr, Is.EqualTo(0));

            Assert.That(meshoneddim.dim, Is.EqualTo(oneddim));
            Assert.That(meshoneddim.numnode, Is.EqualTo(onednumnode));
            Assert.That(meshoneddim.numedge, Is.EqualTo(onednumedge));
            Assert.That(meshoneddim.numlayer, Is.EqualTo(onednumlayer));
            Assert.That(meshoneddim.ngeometry, Is.EqualTo(nt_ngeometry));
            Assert.That(meshoneddim.layertype, Is.EqualTo(onedlayertype));

            var meshoned = new meshgeom();
            //mesh variables
            meshoned.nodex  = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.nodey  = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.nodez  = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numedge * 2);
            //network variables
            meshoned.nnodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
            meshoned.nnodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
            meshoned.branchidx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numnode);
            meshoned.nbranchgeometrynodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nbranches);
            meshoned.branchoffsets = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.ngeopointx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
            meshoned.ngeopointy = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
            meshoned.nbranchlengths = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);
            meshoned.nedge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nbranches);
            meshoned.nbranchorder = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nbranches);

            //need to produce a file with coordinate_space = string variable
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshonedid, ref meshonedid, ref meshoned, ref start_index, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));

            double[] rc_onednodex = new double[onednumnode];
            double[] rc_onednodey = new double[onednumnode];
            double[] rc_onednodez = new double[onednumnode];
            Marshal.Copy(meshoned.nodex, rc_onednodex, 0, onednumnode);
            Marshal.Copy(meshoned.nodey, rc_onednodey, 0, onednumnode);
            Marshal.Copy(meshoned.nodez, rc_onednodez, 0, onednumnode);

            //gridwrapper
            var wrapperGridgeom = new GridGeomLibWrapper();
            ierr = wrapperGridgeom.ggeo_get_xy_coordinates(ref meshoned.branchidx, ref meshoned.branchoffsets, ref meshoned.ngeopointx,
                ref meshoned.ngeopointy, ref meshoned.nbranchgeometrynodes, ref meshoned.nbranchlengths, ref meshoned.nodex, ref meshoned.nodey, ref jsferic, ref meshoneddim.nbranches, ref meshoneddim.ngeometry, ref meshoneddim.numnode);
            Assert.That(ierr, Is.EqualTo(0));

            //ggeo_convert to fill in kn matrix, so we can call make1D2Dinternalnetlinks_dll
            int startIndex = 0;
            ierr = wrapperGridgeom.ggeo_convert(ref meshoned, ref meshoneddim, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshtwod, ref meshtwoddim, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));
            //convert ugrid to xy coordinates
            Assert.That(ierr, Is.EqualTo(0));

            //call make1d2dlinks, no argument needed (all in memory)
            // empty polygon
            int c_npl = 0;
            IntPtr c_xpl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            IntPtr c_ypl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            IntPtr c_zpl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            int c_nOneDMask = 0;
            IntPtr c_oneDmask = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * 0);
            ierr = wrapperGridgeom.ggeo_make1D2Dinternalnetlinks(ref c_npl, ref c_xpl, ref c_ypl, ref c_zpl, ref c_nOneDMask, ref c_oneDmask);
            Assert.That(ierr, Is.EqualTo(0));

            //deallocate memory of gridgeom
            ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperNetcdf.ionc_close(ref ioncid);
            Assert.That(ierr, Is.EqualTo(0));

            //free arrays
            //2d
            Marshal.FreeCoTaskMem(meshtwod.nodex);
            Marshal.FreeCoTaskMem(meshtwod.nodey);
            Marshal.FreeCoTaskMem(meshtwod.nodez);
            Marshal.FreeCoTaskMem(meshtwod.edge_nodes);

             //1d
                //mesh variables
            Marshal.FreeCoTaskMem(meshoned.nodex);
            Marshal.FreeCoTaskMem(meshoned.nodey);
            Marshal.FreeCoTaskMem(meshoned.nodez);
            //Marshal.FreeCoTaskMem(meshoned.edge_nodes);
            //network variables
            //Marshal.FreeCoTaskMem(meshoned.nnodex);
            Marshal.FreeCoTaskMem(meshoned.nnodey);
            Marshal.FreeCoTaskMem(meshoned.branchidx);
            Marshal.FreeCoTaskMem(meshoned.nbranchgeometrynodes);
            Marshal.FreeCoTaskMem(meshoned.branchoffsets);
            Marshal.FreeCoTaskMem(meshoned.ngeopointx);
            Marshal.FreeCoTaskMem(meshoned.ngeopointy);
            Marshal.FreeCoTaskMem(meshoned.nbranchlengths);
            Marshal.FreeCoTaskMem(meshoned.nedge_nodes);
            Marshal.FreeCoTaskMem(meshoned.nbranchorder);
        }

        /// <summary>
        /// In this test we read a 2d grid from file and we provide the 1d discretization points.
        /// We emulate the case where  Delta Shell has a 2d file opened and the user creates a 1d mesh and wants to generate the links.
        /// 1D discretization and links are saved in memory and written afterwards. 
        /// </summary>
        [Test]
        [Category("ougridTests")]
        public void CreateLinksFrom2DFile()
        {
            //mesh2d
            int twoddim = 2;
            int twodnumnode = 16;
            int twodnumedge = 24;
            int twodnumface = 9;
            int twodmaxnumfacenodes = 4;
            int twodnumlayer = -1;
            int twodlayertype = -1;
            int startIndex = 1; // the indexes in the array are zero based

            //mesh1d
            //discretization points information
            int nmeshpoints = 4;
            int nbranches = 1;
            int[] branchids = { 1, 1, 1, 1 };
            double[] meshXCoords = { -6, 5,  23, 34 };
            double[] meshYCoords = { 22, 16, 16, 7 };
            double[] branchoffset = { 0, 10, 20, 100 }; /// important are the first and last offset
            double[] branchlength = { 100 };
            int[] sourcenodeid = { 1 };
            int[] targetnodeid = { 2 };


            //links
            int[] arrayfrom = { 2, 8 };
            int[] arrayto   = { 2, 3};

            //1. open the file with the 2d mesh
            string c_path = TestHelper.TestFilesDirectoryPath() + @"\2d_ugrid_net.nc";
            Assert.IsTrue(File.Exists(c_path));
            int ioncid = 0; //file variable 
            int mode = 0;   //create in read mode
            var wrapperNetcdf = new IoNetcdfLibWrapper();
            int iconvtype = 2;
            double convversion = 0.0;
            var ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
            Assert.That(ierr, Is.EqualTo(0));

            //2. get the 2d mesh id
            int meshid = 1;
            ierr = wrapperNetcdf.ionc_get_2d_mesh_id(ref ioncid, ref meshid);
            Assert.That(ierr, Is.EqualTo(0));

            //3. get the dimensions of the 2d mesh
            var meshtwoddim = new meshgeomdim();
            int l_networkid = 0;
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref l_networkid, ref meshtwoddim);
            Assert.That(ierr, Is.EqualTo(0));

            Assert.That(meshtwoddim.dim, Is.EqualTo(twoddim));
            Assert.That(meshtwoddim.numnode, Is.EqualTo(twodnumnode));
            Assert.That(meshtwoddim.numedge, Is.EqualTo(twodnumedge));
            Assert.That(meshtwoddim.numface, Is.EqualTo(twodnumface));
            Assert.That(meshtwoddim.maxnumfacenodes, Is.EqualTo(twodmaxnumfacenodes));
            Assert.That(meshtwoddim.numlayer, Is.EqualTo(twodnumlayer));
            Assert.That(meshtwoddim.layertype, Is.EqualTo(twodlayertype));

            //4. allocate the arrays in meshgeom for storing the 2d mesh coordinates, edge_nodes
            var meshtwod = new meshgeom();
            meshtwod.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * twodnumnode);
            meshtwod.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * twodnumnode);
            meshtwod.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * twodnumnode);
            meshtwod.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.numedge * 2);
            meshtwod.face_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.maxnumfacenodes * meshtwoddim.numface);
            meshtwod.startIndex = startIndex;

            //5. get the meshgeom arrays
            bool includeArrays = true;
            int start_index = 1;
            int l_network1d = 0;
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref l_network1d, ref meshtwod, ref start_index, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));
            double[] rc_twodnodex = new double[twodnumnode];
            double[] rc_twodnodey = new double[twodnumnode];
            double[] rc_twodnodez = new double[twodnumnode];
            Marshal.Copy(meshtwod.nodex, rc_twodnodex, 0, twodnumnode);
            Marshal.Copy(meshtwod.nodey, rc_twodnodey, 0, twodnumnode);
            Marshal.Copy(meshtwod.nodez, rc_twodnodez, 0, twodnumnode);

            //6. allocate the 1d arrays for storing the 1d coordinates and edge_nodes
            IntPtr c_meshXCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_meshYCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_branchids = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nmeshpoints);
            IntPtr c_sourcenodeid = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nbranches);
            IntPtr c_targetnodeid = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nbranches);
            IntPtr c_branchoffset = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_branchlength = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nbranches);

            Marshal.Copy(branchids, 0, c_branchids, nmeshpoints);
            Marshal.Copy(meshXCoords, 0, c_meshXCoords, nmeshpoints);
            Marshal.Copy(meshYCoords, 0, c_meshYCoords, nmeshpoints);
            Marshal.Copy(sourcenodeid, 0, c_sourcenodeid, nbranches);
            Marshal.Copy(targetnodeid, 0, c_targetnodeid, nbranches);
            Marshal.Copy(branchoffset, 0, c_branchoffset, nmeshpoints);
            Marshal.Copy(branchlength, 0, c_branchlength, nbranches);


            //7. fill kn (Herman datastructure) for creating the links
            var wrapperGridgeom = new GridGeomLibWrapper();
            ierr = wrapperGridgeom.ggeo_convert_1d_arrays(ref c_meshXCoords, ref c_meshYCoords, ref c_branchoffset, ref c_branchlength, ref c_branchids, ref c_sourcenodeid, ref c_targetnodeid, ref nbranches, ref nmeshpoints, ref startIndex);
            
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshtwod, ref meshtwoddim, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            //9. make the links
            int c_npl = 0;
            IntPtr c_xpl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            IntPtr c_ypl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            IntPtr c_zpl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            int c_nOneDMask = 0;
            IntPtr c_oneDmask = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * 0);
            ierr = wrapperGridgeom.ggeo_make1D2Dinternalnetlinks(ref c_npl, ref c_xpl, ref c_ypl, ref c_zpl, ref c_nOneDMask, ref c_oneDmask);
            Assert.That(ierr, Is.EqualTo(0));

            //10. get the number of links
            int n1d2dlinks = 0;
            int linkType = 3;
            ierr = wrapperGridgeom.ggeo_get_links_count(ref n1d2dlinks, ref linkType);
            Assert.That(ierr, Is.EqualTo(0));

            //11. get the links: arrayfrom = 2d cell index, arrayto = 1d node index 
            IntPtr c_arrayfrom = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * n1d2dlinks); //2d cell number
            IntPtr c_arrayto = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * n1d2dlinks); //1d node
            ierr = wrapperGridgeom.ggeo_get_links(ref c_arrayfrom, ref c_arrayto, ref n1d2dlinks, ref linkType, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));
            Assert.That(n1d2dlinks, Is.EqualTo(arrayfrom.Length));

            int[] rc_arrayfrom = new int[n1d2dlinks];
            int[] rc_arrayto = new int[n1d2dlinks];
            Marshal.Copy(c_arrayfrom, rc_arrayfrom, 0, n1d2dlinks);
            Marshal.Copy(c_arrayto, rc_arrayto, 0, n1d2dlinks);
            for (int i = 0; i < n1d2dlinks; i++)
            {
                Assert.That(rc_arrayfrom[i], Is.EqualTo(arrayfrom[i]));
                Assert.That(rc_arrayto[i], Is.EqualTo(arrayto[i]));
            }
            //for writing the links look io_netcdf ionc_def_mesh_contact, ionc_put_mesh_contact
            ierr = wrapperNetcdf.ionc_close(ref ioncid);
            Assert.That(ierr, Is.EqualTo(0));

            //Free 2d arrays
            Marshal.FreeCoTaskMem(meshtwod.nodex);
            Marshal.FreeCoTaskMem(meshtwod.nodey);
            Marshal.FreeCoTaskMem(meshtwod.nodez);
            Marshal.FreeCoTaskMem(meshtwod.edge_nodes);

            //Free 1d arrays
            Marshal.FreeCoTaskMem(c_meshXCoords);
            Marshal.FreeCoTaskMem(c_meshYCoords);
            Marshal.FreeCoTaskMem(c_branchids);

            //Free from and to arrays describing the links 
            Marshal.FreeCoTaskMem(c_arrayfrom);
            Marshal.FreeCoTaskMem(c_arrayto);

            ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));
        }

        /// <summary>
        /// In this test we read a 2d grid from file and we provide the 1d discretization points.
        /// We emulate the case where  Delta Shell has a 2d file opened and the user creates a 1d mesh and wants to generate the links.
        /// 1D discretization and links are saved in memory and written afterwards. 
        /// </summary>
        [Test]
        [NUnit.Framework.Category("ougridTests")]
        public void createLinksFrom2dFileThreeBranches()
        {
            //mesh2d
            int twoddim = 2;
            int twodnumnode = 16;
            int twodnumedge = 24;
            int twodnumface = 9;
            int twodmaxnumfacenodes = 4;
            int twodnumlayer = -1;
            int twodlayertype = -1;
            int startIndex = 1;

            //mesh1d
            //discretization points information
            int nmeshpoints = 9;
            int nbranches = 3;
            int[] branchids = { 1, 1, 1, 1, 2, 2, 2, 3, 3 };
            double[] meshXCoords = { 7.5, 12.5, 17.5, 22.5, 22.5, 22.5, 22.5, 17.5, 12.5 };
            double[] meshYCoords = { 22.5, 22.5, 22.5, 22.5, 17.5, 12.5, 7.5, 12.5, 17.5 };
            double[] branchoffset = { 0, 1, 2, 10, 1, 2, 10,  1, 2 }; /// the actual values of the offset are not important 
            double[] branchlength = { 10, 10, 10 };

            int[] sourcenodeid = { 1, 2, 3 };
            int[] targetnodeid = { 2, 3, 1 };


            //1. open the file with the 2d mesh
            string c_path = TestHelper.TestFilesDirectoryPath() + @"\2d_ugrid_net.nc";
            Assert.IsTrue(File.Exists(c_path));
            int ioncid = 0; //file variable 
            int mode = 0;   //create in read mode
            var wrapperNetcdf = new IoNetcdfLibWrapper();
            int iconvtype = 2;
            double convversion = 0.0;
            var ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
            Assert.That(ierr, Is.EqualTo(0));

            //2. get the 2d mesh id
            int meshid = 1;
            ierr = wrapperNetcdf.ionc_get_2d_mesh_id(ref ioncid, ref meshid);
            Assert.That(ierr, Is.EqualTo(0));

            //3. get the dimensions of the 2d mesh
            var meshtwoddim = new meshgeomdim();
            int l_networkid = 0; //sets an invalid network
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref l_networkid, ref meshtwoddim);
            Assert.That(ierr, Is.EqualTo(0));

            Assert.That(meshtwoddim.dim, Is.EqualTo(twoddim));
            Assert.That(meshtwoddim.numnode, Is.EqualTo(twodnumnode));
            Assert.That(meshtwoddim.numedge, Is.EqualTo(twodnumedge));
            Assert.That(meshtwoddim.numface, Is.EqualTo(twodnumface));
            Assert.That(meshtwoddim.maxnumfacenodes, Is.EqualTo(twodmaxnumfacenodes));
            Assert.That(meshtwoddim.numlayer, Is.EqualTo(twodnumlayer));
            Assert.That(meshtwoddim.layertype, Is.EqualTo(twodlayertype));

            //4. allocate the arrays in meshgeom for storing the 2d mesh coordinates, edge_nodes
            var meshtwod = new meshgeom();
            meshtwod.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * twodnumnode);
            meshtwod.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * twodnumnode);
            meshtwod.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * twodnumnode);
            meshtwod.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.numedge * 2);
            meshtwod.face_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.maxnumfacenodes * meshtwoddim.numface);
            meshtwod.startIndex = startIndex;

            //5. get the meshgeom arrays
            bool includeArrays = true;
            int start_index = 1;
            int l_network1d = 0;
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref l_network1d, ref meshtwod, ref start_index, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));
            double[] rc_twodnodex = new double[twodnumnode];
            double[] rc_twodnodey = new double[twodnumnode];
            double[] rc_twodnodez = new double[twodnumnode];
            Marshal.Copy(meshtwod.nodex, rc_twodnodex, 0, twodnumnode);
            Marshal.Copy(meshtwod.nodey, rc_twodnodey, 0, twodnumnode);
            Marshal.Copy(meshtwod.nodez, rc_twodnodez, 0, twodnumnode);

            //6. allocate the 1d arrays for storing the 1d coordinates and edge_nodes
            IntPtr c_meshXCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_meshYCoords = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_branchids = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nmeshpoints);
            IntPtr c_sourcenodeid = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nbranches);
            IntPtr c_targetnodeid = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * nbranches);
            IntPtr c_branchoffset = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nmeshpoints);
            IntPtr c_branchlength = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * nbranches);

            Marshal.Copy(branchids, 0, c_branchids, nmeshpoints);
            Marshal.Copy(meshXCoords, 0, c_meshXCoords, nmeshpoints);
            Marshal.Copy(meshYCoords, 0, c_meshYCoords, nmeshpoints);
            Marshal.Copy(sourcenodeid, 0, c_sourcenodeid, nbranches);
            Marshal.Copy(targetnodeid, 0, c_targetnodeid, nbranches);
            Marshal.Copy(branchoffset, 0, c_branchoffset, nmeshpoints);
            Marshal.Copy(branchlength, 0, c_branchlength, nbranches);

            //7. fill kn (Herman datastructure) for creating the links
            var wrapperGridgeom = new GridGeomLibWrapper();
            ierr = wrapperGridgeom.ggeo_convert_1d_arrays(ref c_meshXCoords, ref c_meshYCoords, ref c_branchoffset, ref c_branchlength, ref c_branchids, ref c_sourcenodeid, ref c_targetnodeid, ref nbranches, ref nmeshpoints, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshtwod, ref meshtwoddim, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            //9. make the links
            int c_npl = 0;
            IntPtr c_xpl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            IntPtr c_ypl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            IntPtr c_zpl = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * 0);
            int c_nOneDMask = 0;
            IntPtr c_oneDmask = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * 0);
            ierr = wrapperGridgeom.ggeo_make1D2Dinternalnetlinks(ref c_npl, ref c_xpl, ref c_ypl, ref c_zpl, ref c_nOneDMask, ref c_oneDmask);
            Assert.That(ierr, Is.EqualTo(0));

            //10. get the number of links
            int n1d2dlinks = 0;
            int linkType = 3;
            ierr = wrapperGridgeom.ggeo_get_links_count(ref n1d2dlinks, ref linkType);
            Assert.That(ierr, Is.EqualTo(0));


            //11. get the links: arrayfrom = 2d cell index, arrayto = 1d node index 
            IntPtr c_arrayfrom = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * n1d2dlinks); //2d cell number
            IntPtr c_arrayto = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * n1d2dlinks); //1d node
            ierr = wrapperGridgeom.ggeo_get_links(ref c_arrayfrom, ref c_arrayto, ref n1d2dlinks, ref linkType, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            int[] rc_arrayfrom = new int[n1d2dlinks];
            int[] rc_arrayto = new int[n1d2dlinks];
            Marshal.Copy(c_arrayfrom, rc_arrayfrom, 0, n1d2dlinks);
            Marshal.Copy(c_arrayto, rc_arrayto, 0, n1d2dlinks);

            //for writing the links look io_netcdf ionc_def_mesh_contact, ionc_put_mesh_contact 
            ierr = wrapperNetcdf.ionc_close(ref ioncid);
            Assert.That(ierr, Is.EqualTo(0));

            //Free 2d arrays
            Marshal.FreeCoTaskMem(meshtwod.nodex);
            Marshal.FreeCoTaskMem(meshtwod.nodey);
            Marshal.FreeCoTaskMem(meshtwod.nodez);
            Marshal.FreeCoTaskMem(meshtwod.edge_nodes);

            //Free 1d arrays
            Marshal.FreeCoTaskMem(c_meshXCoords);
            Marshal.FreeCoTaskMem(c_meshYCoords);
            Marshal.FreeCoTaskMem(c_branchids);

            //Free from and to arrays describing the links 
            Marshal.FreeCoTaskMem(c_arrayfrom);
            Marshal.FreeCoTaskMem(c_arrayto);

            //Free gridgeom memory
            ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));
        }

        [Test]
        [TestCase("default")]
        //[TestCase(@"pathToNetFile")]
        [NUnit.Framework.Category("findcells")]
        public void testFindCells(string path)
        {
            //int stackSize = 1024 * 1024 * 32; //LC: in C# the default stack size is 1 MB, increase it to something larger for this test!
            //Thread th = new Thread(() =>
            //{
                //1. open the file with the 2d mesh
                string c_path;
                if (path == "default")
                {
                    c_path = TestHelper.TestFilesDirectoryPath() + @"\2d_ugrid_net.nc";
                }
                else
                {
                    c_path = path;
                }
                Assert.IsTrue(File.Exists(c_path));
                int ioncid = 0; //file variable 
                int mode = 0; //create in read mode
                var wrapperNetcdf = new IoNetcdfLibWrapper();
                int iconvtype = 2;
                double convversion = 0.0;
                var ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
                Assert.That(ierr, Is.EqualTo(0));

                //2. get the 2d mesh id
                int meshid = 1;
                ierr = wrapperNetcdf.ionc_get_2d_mesh_id(ref ioncid, ref meshid);
                Assert.That(ierr, Is.EqualTo(0));

                //3. get the dimensions of the 2d mesh
                var meshDimIn = new meshgeomdim();
                int l_networkid = 0; //sets an invalid network
                ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref l_networkid, ref meshDimIn);
                Assert.That(ierr, Is.EqualTo(0));

                //4. allocate meshgeom to pass to find_cells
                var meshIn = new meshgeom();
                meshIn.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshDimIn.numnode);
                meshIn.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshDimIn.numnode);
                meshIn.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshDimIn.numnode);
                meshIn.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshDimIn.numedge * 2);

                //5. get the meshgeom arrays from file
                bool includeArrays = true;
                int start_index = 1; //retrive as 1 based
                int l_network1d = -1; //no network present
                ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref l_network1d, ref meshIn,
                    ref start_index, ref includeArrays);
                Assert.That(ierr, Is.EqualTo(0));

                //5. declare but do not allocate meshgeom. it will be allocated by gridgeom (fortran)
                var meshOut = new meshgeom();
                var meshDim = new meshgeomdim();

                //6. call find cells  
                int startIndex = 1; // provide 1 based (read from netcdf), return 1 based
                var wrapperGridgeom = new GridGeomLibWrapper();
                ierr = wrapperGridgeom.ggeo_count_cells(ref meshDimIn, ref meshIn, ref meshDim);

                meshOut.face_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshDim.numface* meshDim.maxnumfacenodes);
                meshOut.facex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshDim.numface);
                meshOut.facey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshDim.numface);

                Assert.That(ierr, Is.EqualTo(0));
                ierr = wrapperGridgeom.ggeo_find_cells(ref meshDim, ref meshOut);
                Assert.That(ierr, Is.EqualTo(0));

                //7. copy face_nodes to array
                int[] face_nodes = new int[meshDim.maxnumfacenodes * meshDim.numface];
                Marshal.Copy(meshOut.face_nodes, face_nodes, 0, meshDim.maxnumfacenodes * meshDim.numface);

                //8. deallocate memory allocated by c#
                Marshal.FreeCoTaskMem(meshIn.nodex);
                Marshal.FreeCoTaskMem(meshIn.nodey);
                Marshal.FreeCoTaskMem(meshIn.nodez);
                Marshal.FreeCoTaskMem(meshIn.edge_nodes);

                Marshal.FreeCoTaskMem(meshOut.face_nodes);
                Marshal.FreeCoTaskMem(meshOut.facex);
                Marshal.FreeCoTaskMem(meshOut.facey);

                //Free gridgeom
                ierr = wrapperGridgeom.ggeo_deallocate();
                Assert.That(ierr, Is.EqualTo(0));

            //}, stackSize);
            //th.Start();
            //th.Join();
        }

        /*
        [Test]
        [TestCase("default")]
        //[TestCase(@"pathToNetFile")]
        [NUnit.Framework.Category("make1D2DEmbeddedLinks")]
        public void make1D2DEmbeddedLinks(string path)
        {

            //1. open the file with the 1d network, 1d mesh and 2d grid.
            string c_path = TestHelper.TestFilesDirectoryPath() + @"\1d2dForEmbedded.nc";
            Assert.IsTrue(File.Exists(c_path));
            int ioncid = 0; //file variable 
            int mode = 0;   //create in read mode
            var wrapperNetcdf = new IoNetcdfLibWrapper();
            var wrapperGridgeom = new GridGeomLibWrapper();
            var ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));
            int iconvtype = 2;
            double convversion = 0.0;
            ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
            Assert.That(ierr, Is.EqualTo(0));

            int meshid = -1;
            int networkid = -1;
            bool includeArrays = true;
            int startIndex = 1;
            int jsferic = 0;
            //--------------------------------------------------------------------------------------//
            //2a. get network and mesh ids
            ierr = wrapperNetcdf.ionc_get_1d_network_id(ref ioncid, ref networkid);
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperNetcdf.ionc_get_1d_mesh_id(ref ioncid, ref meshid);
            Assert.That(ierr, Is.EqualTo(0));

            //2b. get dimensions
            var meshoneddim = new meshgeomdim();
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref networkid, ref meshoneddim);
            Assert.That(ierr, Is.EqualTo(0));

            //2c. allocate
            var meshoned = new meshgeom();
            //mesh variables
            meshoned.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            
            //network variables
            meshoned.nnodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
            meshoned.nnodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
            meshoned.branchidx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numnode);
            meshoned.nedge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nnodes * 2);
            meshoned.nbranchgeometrynodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nbranches);
            meshoned.branchoffsets = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.ngeopointx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
            meshoned.ngeopointy = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
            meshoned.nbranchlengths = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);
            meshoned.nbranchorder = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);

            //2d. get 1d meshgeom array 
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref networkid, ref meshoned, ref startIndex, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));

            ierr = wrapperGridgeom.ggeo_count_edge_nodes(ref meshoned.branchoffsets, ref meshoned.nbranchlengths,
                ref meshoned.branchidx, ref meshoned.nedge_nodes, ref meshoneddim.nbranches, ref meshoneddim.numnode,
                ref meshoneddim.numedge, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            meshoned.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numedge * 2);
            ierr = wrapperGridgeom.ggeo_create_edge_nodes(ref meshoned.branchoffsets, ref meshoned.nbranchlengths,
                ref meshoned.branchidx, ref meshoned.nedge_nodes, ref meshoned.edge_nodes, ref meshoneddim.nbranches, ref meshoneddim.numnode,
                ref meshoneddim.numedge, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            //Read the created edge nodes
            int[] edge_nodes = new int[meshoneddim.numedge * 2];
            Marshal.Copy(meshoned.edge_nodes, edge_nodes, 0, meshoneddim.numedge * 2);
            Assert.That(edge_nodes.Contains(0),Is.EqualTo(false));

            //--------------------------------------------------------------------------------------//
            //3a. get mesh ids
            ierr = wrapperNetcdf.ionc_get_2d_mesh_id(ref ioncid, ref meshid);
            Assert.That(ierr, Is.EqualTo(0));
            networkid = -1;

            //3b. get dimensions
            var meshtwoddim = new meshgeomdim();
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref networkid, ref meshtwoddim);
            Assert.That(ierr, Is.EqualTo(0));

            //3c. allocate
            var meshtwod = new meshgeom();
            meshtwod.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double))   * meshtwoddim.numnode);
            meshtwod.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double))   * meshtwoddim.numnode);
            meshtwod.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double))   * meshtwoddim.numnode);
            meshtwod.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.numedge * 2);

            //3d. get meshgeom 
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref networkid, ref meshtwod, ref startIndex, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));

            //8. close file
            ierr = wrapperNetcdf.ionc_close(ref ioncid);
            Assert.That(ierr, Is.EqualTo(0));

            //--------------------------------------------------------------------------------------//
            //4. fill kn (Herman datastructure) for creating the links

            ierr = wrapperGridgeom.ggeo_get_xy_coordinates(ref meshoned.branchidx, ref meshoned.branchoffsets, ref meshoned.ngeopointx,
                ref meshoned.ngeopointy, ref meshoned.nbranchgeometrynodes, ref meshoned.nbranchlengths, ref meshoned.nodex, ref meshoned.nodey, ref jsferic, ref meshoneddim.nbranches, ref meshoneddim.ngeometry, ref meshoneddim.numnode);
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshoned, ref meshoneddim, ref startIndex);

            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshtwod, ref meshtwoddim, ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            //5. make the links
            int c_npl = 0;
            int c_nOneDMask = meshoneddim.numnode;
            IntPtr c_oneDmask = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numnode);
            int[] oneDmask = new int[meshoneddim.numnode];
            for (int i=0;i< meshoneddim.numnode; i++)
            {
                oneDmask[i] = 1;
            }
            Marshal.Copy(oneDmask, 0, c_oneDmask, meshoneddim.numnode);
            ierr = wrapperGridgeom.ggeo_make1D2DEmbeddedLinks(ref c_nOneDMask, ref c_oneDmask);
            Assert.That(ierr, Is.EqualTo(0));

            //6. get the number of links
            int n1d2dlinks = 0;
            int linkType = 3;
            ierr = wrapperGridgeom.ggeo_get_links_count(ref n1d2dlinks, ref linkType);
            Assert.That(ierr, Is.EqualTo(0));

            IntPtr c_arrayfrom = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * n1d2dlinks); //2d cell number
            IntPtr c_arrayto = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * n1d2dlinks); //1d node
            ierr = wrapperGridgeom.ggeo_get_links(ref c_arrayfrom, ref c_arrayto, ref n1d2dlinks, ref linkType,ref startIndex);
            Assert.That(ierr, Is.EqualTo(0));

            int[] rc_arrayfrom = new int[n1d2dlinks];
            int[] rc_arrayto = new int[n1d2dlinks];
            Marshal.Copy(c_arrayfrom, rc_arrayfrom, 0, n1d2dlinks);
            Marshal.Copy(c_arrayto, rc_arrayto, 0, n1d2dlinks);

            var arrayfrom = new [] { 1, 11, 12, 22, 23, 33, 34, 44, 45, 55, 56, 66, 67, 77, 78, 79, 89};
            var arrayto   = new [] { 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5};

            for (int i = 0; i < n1d2dlinks; i++)
            {
                // Console.Write("i:{0} rc_arrayfrom:{1} arrayfrom:{2} rc_arrayto:{3} arrayto:{4}\n", i.ToString("D"), rc_arrayfrom[i].ToString("D"), arrayfrom[i].ToString("D"), rc_arrayto[i].ToString("D"), arrayto[i].ToString("D"));
                Assert.That(rc_arrayfrom[i], Is.EqualTo(arrayfrom[i]));
                Assert.That(rc_arrayto[i], Is.EqualTo(arrayto[i]));
            } 
            // 7.deallocate memory of gridgeom
            ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));
        }
        */

        /*
		// The network of this test can be seen in packages\test_data\1dnetworkMake1D2DRiverLinksTest.png
        [Test]
        [TestCase("default")]
        [NUnit.Framework.Category("make1D2DRiverLinks")]
        public void make1D2DRiverLinks(string path)
        {

            //1. open the file with the 1d network, 1d mesh and 2d grid.
            string c_path = TestHelper.TestFilesDirectoryPath() + @"\1d2dForEmbeddedRiverLinks.nc";
            Assert.IsTrue(File.Exists(c_path));
            int ioncid = 0; //file variable 
            int mode = 0;   //create in read mode
            var wrapperNetcdf = new IoNetcdfLibWrapper();
            var wrapperGridgeom = new GridGeomLibWrapper();
            var ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));
            int iconvtype = 2;
            double convversion = 0.0;
            ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
            Assert.That(ierr, Is.EqualTo(0));

            int meshid         = -1;
            int networkid      = -1;
            bool includeArrays = true;
            int start_index    = 1;
            int jsferic        = 0;
            //--------------------------------------------------------------------------------------//
            //2a. get network and mesh ids
            ierr = wrapperNetcdf.ionc_get_1d_network_id(ref ioncid, ref networkid);
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperNetcdf.ionc_get_1d_mesh_id(ref ioncid, ref meshid);
            Assert.That(ierr, Is.EqualTo(0));

            //2b. get dimensions
            var meshoneddim = new meshgeomdim();
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref networkid, ref meshoneddim);
            Assert.That(ierr, Is.EqualTo(0));

            //2c. allocate
            var meshoned = new meshgeom();
            //mesh variables
            meshoned.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);

            //network variables
            meshoned.nnodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
            meshoned.nnodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
            meshoned.branchidx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numnode);
            meshoned.nedge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nnodes * 2);
            meshoned.nbranchgeometrynodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nbranches);
            meshoned.branchoffsets = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
            meshoned.ngeopointx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
            meshoned.ngeopointy = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
            meshoned.nbranchlengths = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);
            meshoned.nbranchorder = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);

            //2d. get 1d meshgeom array 
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref networkid, ref meshoned, ref start_index, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));

            ierr = wrapperGridgeom.ggeo_count_edge_nodes(ref meshoned.branchoffsets, ref meshoned.nbranchlengths,
                ref meshoned.branchidx, ref meshoned.nedge_nodes, ref meshoneddim.nbranches, ref meshoneddim.nnodes,
                ref meshoneddim.numedge, ref start_index);
            Assert.That(ierr, Is.EqualTo(0));

            meshoned.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numedge * 2);
            ierr = wrapperGridgeom.ggeo_create_edge_nodes(ref meshoned.branchoffsets, ref meshoned.nbranchlengths,
                ref meshoned.branchidx, ref meshoned.nedge_nodes, ref meshoned.edge_nodes, ref meshoneddim.nbranches, ref meshoneddim.nnodes,
                ref meshoneddim.numedge, ref start_index);
            Assert.That(ierr, Is.EqualTo(0));

            //Read the created edge nodes
            int[] edge_nodes = new int[meshoneddim.numedge * 2];
            Marshal.Copy(meshoned.edge_nodes, edge_nodes, 0, meshoneddim.numedge * 2);
            Assert.That(edge_nodes.Contains(0), Is.EqualTo(false));

            
            //--------------------------------------------------------------------------------------//
            //3a. get mesh ids
            ierr = wrapperNetcdf.ionc_get_2d_mesh_id(ref ioncid, ref meshid);
            Assert.That(ierr, Is.EqualTo(0));
            networkid = -1;

            //3b. get dimensions
            var meshtwoddim = new meshgeomdim();
            ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref networkid, ref meshtwoddim);
            Assert.That(ierr, Is.EqualTo(0));

            //3c. allocate
            var meshtwod = new meshgeom();
            meshtwod.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshtwoddim.numnode);
            meshtwod.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshtwoddim.numnode);
            meshtwod.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshtwoddim.numnode);
            meshtwod.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshtwoddim.numedge * 2);

            //3d. get meshgeom 
            ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref networkid, ref meshtwod, ref start_index, ref includeArrays);
            Assert.That(ierr, Is.EqualTo(0));

            //8. close file
            ierr = wrapperNetcdf.ionc_close(ref ioncid);
            Assert.That(ierr, Is.EqualTo(0));

            //--------------------------------------------------------------------------------------//
            //4. Herman datastructure for creating the links.

            ierr = wrapperGridgeom.ggeo_get_xy_coordinates(ref meshoned.branchidx, ref meshoned.branchoffsets, ref meshoned.ngeopointx,
                ref meshoned.ngeopointy, ref meshoned.nbranchgeometrynodes, ref meshoned.nbranchlengths, ref meshoned.nodex, ref meshoned.nodey, ref jsferic, ref meshoneddim.nbranches, ref meshoneddim.ngeometry, ref meshoneddim.numnode);
            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshoned, ref meshoneddim, ref start_index);

            Assert.That(ierr, Is.EqualTo(0));
            ierr = wrapperGridgeom.ggeo_convert(ref meshtwod, ref meshtwoddim, ref start_index);
            Assert.That(ierr, Is.EqualTo(0));

            //5. make the links
            int c_npl             = 0;
            IntPtr c_xpl          = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * c_npl);
            IntPtr c_ypl          = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * c_npl);
            IntPtr c_zpl          = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * c_npl);
            int c_nOneDMask       = 0;
            IntPtr c_oneDmask = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * c_nOneDMask);
            ierr = wrapperGridgeom.ggeo_make1D2DRiverLinks(ref c_npl, ref c_xpl, ref c_ypl, ref c_zpl, ref c_nOneDMask,
                ref c_oneDmask);

            Assert.That(ierr, Is.EqualTo(0));

            //6. get the number of links
            int n1d2dlinks = 0;
            int linkType = 3;
            ierr = wrapperGridgeom.ggeo_get_links_count(ref n1d2dlinks, ref linkType);
            Assert.That(ierr, Is.EqualTo(0));

            //7. deallocate memory of gridgeom
            ierr = wrapperGridgeom.ggeo_deallocate();
            Assert.That(ierr, Is.EqualTo(0));

        }
        */

        // Test Jan Mooiman ugrid files 
        //[Test]
        //[TestCase(@"D:\carniato\LUCA\ENGINES\delft3d\ossTest9\src\janm\ugrid_1d_network_mesh_1.nc")]
        ////[TestCase(@"pathToNetFile")]
        //[NUnit.Framework.Category("generateMeshEdgeNodes")]
        //public void generateMeshEdgeNodes(string path)
        //{
        //    //1. open file
        //    var c_path = path;
        //    Assert.IsTrue(File.Exists(c_path));
        //    int ioncid = 0; //file variable 
        //    int mode = 0; //create in read mode
        //    var wrapperNetcdf = new IoNetcdfLibWrapper();
        //    var wrapperGridgeom = new GridGeomLibWrapper();
        //    int iconvtype = 2;
        //    double convversion = 0.0;
        //    var ierr = wrapperNetcdf.ionc_open(c_path, ref mode, ref ioncid, ref iconvtype, ref convversion);
        //    Assert.That(ierr, Is.EqualTo(0));

        //    int meshid = -1;
        //    int networkid = -1;
        //    bool includeArrays = true;
        //    int start_index = 1;
        //    int jsferic = 0;
        //    //--------------------------------------------------------------------------------------//
        //    //2a. get network and mesh ids
        //    ierr = wrapperNetcdf.ionc_get_1d_network_id(ref ioncid, ref networkid);
        //    Assert.That(ierr, Is.EqualTo(0));
        //    ierr = wrapperNetcdf.ionc_get_1d_mesh_id(ref ioncid, ref meshid);
        //    Assert.That(ierr, Is.EqualTo(0));

        //    //2b. get dimensions
        //    var meshoneddim = new meshgeomdim();
        //    ierr = wrapperNetcdf.ionc_get_meshgeom_dim(ref ioncid, ref meshid, ref networkid, ref meshoneddim);
        //    Assert.That(ierr, Is.EqualTo(0));

        //    //2c. allocate
        //    var meshoned = new meshgeom();
        //    //mesh variables
        //    meshoned.nodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
        //    meshoned.nodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
        //    meshoned.nodez = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);

        //    //network variables
        //    meshoned.nnodex = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
        //    meshoned.nnodey = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nnodes);
        //    meshoned.branchidx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numnode);
        //    meshoned.nedge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nnodes * 2);
        //    meshoned.nbranchgeometrynodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.nbranches);
        //    meshoned.branchoffsets = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.numnode);
        //    meshoned.ngeopointx = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
        //    meshoned.ngeopointy = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.ngeometry);
        //    meshoned.nbranchlengths = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);
        //    meshoned.nbranchorder = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(double)) * meshoneddim.nbranches);

        //    //2d. get 1d meshgeom array 
        //    ierr = wrapperNetcdf.ionc_get_meshgeom(ref ioncid, ref meshid, ref networkid, ref meshoned, ref start_index,
        //        ref includeArrays);
        //    Assert.That(ierr, Is.EqualTo(0));

        //    ierr = wrapperGridgeom.ggeo_count_edge_nodes(ref meshoned.branchoffsets, ref meshoned.nbranchlengths,
        //        ref meshoned.branchidx, ref meshoned.nedge_nodes, ref meshoneddim.nbranches, ref meshoneddim.nnodes,
        //        ref meshoneddim.numedge, ref start_index);
        //    Assert.That(ierr, Is.EqualTo(0));

        //    meshoned.edge_nodes = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int)) * meshoneddim.numedge * 2);
        //    ierr = wrapperGridgeom.ggeo_create_edge_nodes(ref meshoned.branchoffsets, ref meshoned.nbranchlengths,
        //        ref meshoned.branchidx, ref meshoned.nedge_nodes, ref meshoned.edge_nodes, ref meshoneddim.nbranches,
        //        ref meshoneddim.nnodes,
        //        ref meshoneddim.numedge, ref start_index);
        //    Assert.That(ierr, Is.EqualTo(0));

        //    //Read the created edge nodes
        //    int[] edge_nodes = new int[meshoneddim.numedge * 2];
        //    Marshal.Copy(meshoned.edge_nodes, edge_nodes, 0, meshoneddim.numedge * 2);
        //    Assert.That(edge_nodes.Contains(0), Is.EqualTo(false));

        //    //8. close file
        //    ierr = wrapperNetcdf.ionc_close(ref ioncid);
        //    Assert.That(ierr, Is.EqualTo(0));
        //}
    }
}