from mpi4py import MPI
import mpiunittest as unittest

class TestCommNull(unittest.TestCase):

    def testConstructor(self):
        comm = MPI.Comm()
        self.assertEqual(comm, MPI.COMM_NULL)
        self.assertIsNot(comm, MPI.COMM_NULL)
        def construct(): MPI.Comm((1,2,3))
        self.assertRaises(TypeError, construct)

    def testConstructorIntra(self):
        comm_null = MPI.Intracomm()
        self.assertEqual(comm_null, MPI.COMM_NULL)
        self.assertIsNot(comm_null, MPI.COMM_NULL)

    def testConstructorInter(self):
        comm_null = MPI.Intercomm()
        self.assertEqual(comm_null, MPI.COMM_NULL)
        self.assertIsNot(comm_null, MPI.COMM_NULL)

    def testPickle(self):
        from pickle import dumps, loads
        comm_null = loads(dumps(MPI.COMM_NULL))
        self.assertIs(comm_null, MPI.COMM_NULL)
        comm_null = loads(dumps(MPI.Comm(MPI.COMM_NULL)))
        self.assertIsNot(comm_null, MPI.COMM_NULL)
        self.assertEqual(comm_null, MPI.COMM_NULL)

class BaseTestComm:

    def testConstructor(self):
        comm = MPI.Comm(self.COMM)
        self.assertEqual(comm, self.COMM)
        self.assertIsNot(comm, self.COMM)

    def testSize(self):
        size = self.COMM.Get_size()
        self.assertGreaterEqual(size, 1)

    def testRank(self):
        size = self.COMM.Get_size()
        rank = self.COMM.Get_rank()
        self.assertGreaterEqual(rank, 0)
        self.assertLess(rank, size)

    def testGroup(self):
        comm  = self.COMM
        group = self.COMM.Get_group()
        self.assertEqual(comm.Get_size(), group.Get_size())
        self.assertEqual(comm.Get_rank(), group.Get_rank())
        group.Free()
        self.assertEqual(group, MPI.GROUP_NULL)

    def testCloneFree(self):
        comm = self.COMM.Clone()
        comm.Free()
        self.assertEqual(comm, MPI.COMM_NULL)

    def testCompare(self):
        results = (MPI.IDENT, MPI.CONGRUENT, MPI.SIMILAR, MPI.UNEQUAL)
        ccmp = MPI.Comm.Compare(self.COMM, MPI.COMM_WORLD)
        self.assertIn(ccmp, results)
        ccmp = MPI.Comm.Compare(self.COMM, self.COMM)
        self.assertEqual(ccmp, MPI.IDENT)
        comm = self.COMM.Dup()
        ccmp = MPI.Comm.Compare(self.COMM, comm)
        comm.Free()
        self.assertEqual(ccmp, MPI.CONGRUENT)

    def testIsInter(self):
        is_inter = self.COMM.Is_inter()
        self.assertIs(type(is_inter), bool)

    def testGetSetName(self):
        try:
            name = self.COMM.Get_name()
            self.COMM.Set_name('comm')
            self.assertEqual(self.COMM.Get_name(), 'comm')
            self.COMM.Set_name(name)
            self.assertEqual(self.COMM.Get_name(), name)
            self.COMM.name = self.COMM.name
        except NotImplementedError:
            self.skipTest('mpi-comm-name')

    def testGetParent(self):
        try:
            parent = MPI.Comm.Get_parent()
            self.assertIsInstance(parent, MPI.Intercomm)
        except NotImplementedError:
            self.skipTest('mpi-comm-get_parent')

    def testDupWithInfo(self):
        info = None
        self.COMM.Dup(info).Free()
        info = MPI.INFO_NULL
        self.COMM.Dup(info).Free()
        self.COMM.Dup_with_info(info).Free()
        info = MPI.Info.Create()
        self.COMM.Dup(info).Free()
        self.COMM.Dup_with_info(info).Free()
        info.Free()

    @unittest.skipMPI('mpich(<=3.1.0)', MPI.Query_thread() > MPI.THREAD_SINGLE)
    def testIDup(self):
        try:
            comm, request = self.COMM.Idup()
        except NotImplementedError:
            self.skipTest('mpi-comm-idup')
        request.Wait()
        ccmp = MPI.Comm.Compare(self.COMM, comm)
        comm.Free()
        self.assertEqual(ccmp, MPI.CONGRUENT)

    @unittest.skipMPI('mpich(<=3.1.0)', MPI.Query_thread() > MPI.THREAD_SINGLE)
    def testIDupWithInfo(self):
        try:
            comm, request = self.COMM.Idup_with_info(MPI.INFO_NULL)
        except NotImplementedError:
            self.skipTest('mpi-comm-idup-info')
        request.Wait()
        ccmp = MPI.Comm.Compare(self.COMM, comm)
        comm.Free()
        self.assertEqual(ccmp, MPI.CONGRUENT)
        #
        new_info = MPI.Info.Create()
        for info in (None, MPI.INFO_NULL, new_info):
            comm, request = self.COMM.Idup(info)
            request.Wait()
            ccmp = MPI.Comm.Compare(self.COMM, comm)
            comm.Free()
            self.assertEqual(ccmp, MPI.CONGRUENT)
        new_info.Free()

    def testGetSetInfo(self):
        info = MPI.Info.Create()
        self.COMM.Set_info(info)
        info.Free()
        info = self.COMM.Get_info()
        self.COMM.Set_info(info)
        info.Free()

    def testCreate(self):
        group = self.COMM.Get_group()
        comm = self.COMM.Create(group)
        ccmp = MPI.Comm.Compare(self.COMM, comm)
        self.assertEqual(ccmp, MPI.CONGRUENT)
        ccmp = self.COMM.Compare(comm)
        self.assertEqual(ccmp, MPI.CONGRUENT)
        comm.Free()
        group.Free()

    @unittest.skipMPI('openmpi(<=1.8.1)')
    def testCreateGroup(self):
        group = self.COMM.Get_group()
        try:
            comm = self.COMM.Create_group(group)
        except NotImplementedError:
            self.assertLess(MPI.VERSION, 3)
            self.skipTest('mpi-comm-create_group')
        else:
            ccmp = MPI.Comm.Compare(self.COMM, comm)
            comm.Free()
            self.assertEqual(ccmp, MPI.CONGRUENT)
        finally:
            group.Free()

    def testCreateFromGroup(self):
        group = self.COMM.Get_group()
        try:
            comm = MPI.Intracomm.Create_from_group(group)
        except NotImplementedError:
            self.assertLess(MPI.VERSION, 4)
            self.skipTest('mpi-comm-create_from_group')
        except MPI.Exception as exc:  # openmpi
            UNSUPPORTED = MPI.ERR_UNSUPPORTED_OPERATION
            if exc.Get_error_class() != UNSUPPORTED:
                raise
        else:
            ccmp = MPI.Comm.Compare(self.COMM, comm)
            comm.Free()
            self.assertEqual(ccmp, MPI.CONGRUENT)
        finally:
            group.Free()

    def testSplit(self):
        base = self.COMM
        comm = base.Split(42, 42)
        self.assertEqual(comm.Get_rank(), base.Get_rank())
        self.assertEqual(comm.Get_size(), base.Get_size())
        comm.Free()
        color = base.Get_rank()
        comm = base.Split(color, 42)
        self.assertEqual(comm.Get_rank(), 0)
        self.assertEqual(comm.Get_size(), 1)
        comm.Free()

    @unittest.skipMPI('openmpi(==2.0.0)')
    def testSplitTypeShared(self):
        try:
            MPI.COMM_SELF.Split_type(MPI.COMM_TYPE_SHARED).Free()
        except NotImplementedError:
            self.skipTest('mpi-comm-split_type')
        comm = self.COMM.Split_type(MPI.UNDEFINED)
        self.assertEqual(comm, MPI.COMM_NULL)
        comm = self.COMM.Split_type(MPI.COMM_TYPE_SHARED)
        self.assertNotEqual(comm, MPI.COMM_NULL)
        size = self.COMM.Get_size()
        rank = self.COMM.Get_rank()
        if size == 1:
            self.assertEqual(comm.size, 1)
            self.assertEqual(comm.rank, 0)
        comm.Free()
        for root in range(size):
            if rank == root:
                split_type = MPI.COMM_TYPE_SHARED
            else:
                split_type = MPI.UNDEFINED
            comm = self.COMM.Split_type(split_type)
            if rank == root:
                self.assertNotEqual(comm, MPI.COMM_NULL)
                self.assertEqual(comm.size, 1)
                self.assertEqual(comm.rank, 0)
                comm.Free()
            else:
                self.assertEqual(comm, MPI.COMM_NULL)

    def testSplitTypeHWGuided(self):
        try:
            MPI.COMM_SELF.Split_type(MPI.COMM_TYPE_SHARED).Free()
        except NotImplementedError:
            self.skipTest('mpi-comm-split_type')
        if MPI.COMM_TYPE_HW_GUIDED == MPI.UNDEFINED:
            self.skipTest("mpi-comm-split_type-hw_guided")
        split_type = MPI.COMM_TYPE_HW_GUIDED
        #
        comm = self.COMM.Split_type(split_type)
        self.assertEqual(comm, MPI.COMM_NULL)
        comm = self.COMM.Split_type(split_type, info=MPI.INFO_NULL)
        self.assertEqual(comm, MPI.COMM_NULL)
        info = MPI.Info.Create()
        comm = self.COMM.Split_type(split_type, info=info)
        self.assertEqual(comm, MPI.COMM_NULL)
        info.Set("foo", "bar")
        comm = self.COMM.Split_type(split_type, info=info)
        self.assertEqual(comm, MPI.COMM_NULL)
        info.Set("mpi_hw_resource_type", "@dont-thread-on-me@")
        comm = self.COMM.Split_type(split_type, info=info)
        self.assertEqual(comm, MPI.COMM_NULL)
        info.Free()
        #
        restype = "mpi_hw_resource_type"
        shmem = "mpi_shared_memory"
        info = MPI.Info.Create()
        info.Set(restype, shmem)
        comm = self.COMM.Split_type(split_type, info=info)
        self.assertNotEqual(comm, MPI.COMM_NULL)
        self.assertEqual(info.Get(restype), shmem)
        comm.Free()
        size = self.COMM.Get_size()
        rank = self.COMM.Get_rank()
        for root in range(size):
            if rank == root:
                split_type = MPI.COMM_TYPE_HW_GUIDED
            else:
                split_type = MPI.UNDEFINED
            comm = self.COMM.Split_type(split_type, info=info)
            self.assertEqual(info.Get(restype), shmem)
            if rank == root:
                self.assertNotEqual(comm, MPI.COMM_NULL)
                self.assertEqual(comm.size, 1)
                self.assertEqual(comm.rank, 0)
                comm.Free()
            else:
                self.assertEqual(comm, MPI.COMM_NULL)
        info.Free()

    def testSplitTypeHWUnguided(self):
        try:
            MPI.COMM_SELF.Split_type(MPI.COMM_TYPE_SHARED).Free()
        except NotImplementedError:
            self.skipTest('mpi-comm-split_type')
        if MPI.COMM_TYPE_HW_UNGUIDED == MPI.UNDEFINED:
            self.skipTest("mpi-comm-split_type-hw_unguided")
        hwcomm = [self.COMM]
        while len(hwcomm) < 32:
            rank = hwcomm[-1].Get_rank()
            info = MPI.Info.Create()
            comm = hwcomm[-1].Split_type(
                MPI.COMM_TYPE_HW_UNGUIDED,
                key=rank, info=info,
            )
            if comm != MPI.COMM_NULL:
                self.assertTrue(info.Get("mpi_hw_resource_type"))
                self.assertLess(comm.Get_size(), hwcomm[-1].Get_size())
            info.Free()
            if comm == MPI.COMM_NULL:
                break
            hwcomm.append(comm)
        for comm in hwcomm[1:]:
            comm.Free()

    def testPickle(self):
        from pickle import dumps, loads
        COMM = self.COMM
        if COMM in (MPI.COMM_SELF, MPI.COMM_WORLD):
            comm = loads(dumps(COMM))
            self.assertIs(comm, COMM)
            comm = loads(dumps(MPI.Intracomm(COMM)))
            self.assertIsNot(comm, COMM)
            self.assertEqual(comm, COMM)
        else:
            self.assertRaises(ValueError, dumps, COMM)

    def testPyProps(self):
        comm = self.COMM
        self.assertEqual(comm.Get_size(), comm.size)
        self.assertEqual(comm.Get_rank(), comm.rank)
        self.assertEqual(comm.Is_intra(), comm.is_intra)
        self.assertEqual(comm.Is_inter(), comm.is_inter)
        self.assertEqual(comm.Get_topology(), comm.topology)
        #
        group = comm.group
        self.assertEqual(type(group), MPI.Group)
        group.Free()
        #
        info = comm.info
        self.assertIs(type(info), MPI.Info)
        comm.info = info
        info.Free()


class TestCommSelf(BaseTestComm, unittest.TestCase):
    def setUp(self):
        self.COMM = MPI.COMM_SELF

    def testSize(self):
        size = self.COMM.Get_size()
        self.assertEqual(size, 1)

    def testRank(self):
        rank = self.COMM.Get_rank()
        self.assertEqual(rank, 0)

    @unittest.skipMPI('openmpi(<5.2.0)')  # open-mpi/ompi#10895
    def testCreateFromGroup(self):
        super().testCreateFromGroup()


class TestCommWorld(BaseTestComm, unittest.TestCase):

    def setUp(self):
        self.COMM = MPI.COMM_WORLD

class TestCommSelfDup(TestCommSelf):

    def setUp(self):
        self.COMM = MPI.COMM_SELF.Dup()

    def tearDown(self):
        self.COMM.Free()

@unittest.skipMPI('openmpi(<1.4.0)', MPI.Query_thread() > MPI.THREAD_SINGLE)
class TestCommWorldDup(TestCommWorld):

    def setUp(self):
        self.COMM = MPI.COMM_WORLD.Dup()

    def tearDown(self):
        self.COMM.Free()


if __name__ == '__main__':
    unittest.main()
