from vtkmodules import vtkCommonCore as cc
from vtkmodules import vtkCommonDataModel as dm
from vtkmodules import vtkCommonExecutionModel as em
from vtkmodules import vtkImagingCore as ic
from vtkmodules.vtkIOParallelXML import vtkXMLPartitionedDataSetWriter
from vtkmodules.vtkIOXML import vtkXMLPartitionedDataSetReader


from vtkmodules.test import Testing
from vtkmodules.util.misc import vtkGetTempDir

import os

class TestXMLPartitionedDataSet(Testing.vtkTest):

    def test(self):

        p = dm.vtkPartitionedDataSet()

        s = ic.vtkRTAnalyticSource()
        s.SetWholeExtent(0, 10, 0, 10, 0, 5)
        s.Update()

        p1 = dm.vtkImageData()
        p1.ShallowCopy(s.GetOutput())

        s.SetWholeExtent(0, 10, 0, 10, 5, 10)
        s.Update()

        p2 = dm.vtkImageData()
        p2.ShallowCopy(s.GetOutput())

        p.SetPartition(0, p1)
        p.SetPartition(1, p2)

        tmpdir = vtkGetTempDir()
        fname = tmpdir+"/testxmlpartds.vtpd"
        w = vtkXMLPartitionedDataSetWriter()
        w.SetInputData(p)
        w.SetFileName(fname)
        w.Write()

        r = vtkXMLPartitionedDataSetReader()
        r.SetFileName(fname)
        r.Update()
        o = r.GetOutputDataObject(0)

        print(o.IsA("vtkPartitionedDataSet"))
        np = o.GetNumberOfPartitions()
        self.assertEqual(np, 2)

        for i in range(np):
            d = o.GetPartition(i)
            d2 = p.GetPartition(i)
            self.assertTrue(d.IsA("vtkImageData"))
            self.assertEqual(d.GetNumberOfCells(), d2.GetNumberOfCells())
        os.remove(fname)

if __name__ == "__main__":
    Testing.main([(TestXMLPartitionedDataSet, 'test')])