import py
from pypy.conftest import option
from pypy.module._rawffi.tracker import Tracker


class AppTestTracker:
    spaceconfig = dict(usemodules=['_rawffi', 'struct'])

    def setup_class(cls):
        #
        # detect if we're running on PyPy with DO_TRACING not compiled in
        if option.runappdirect:
            try:
                import _rawffi
                _rawffi._num_of_allocated_objects()
            except (ImportError, RuntimeError) as e:
                py.test.skip(str(e))
        #
        Tracker.DO_TRACING = True

    def test_array(self):
        import _rawffi
        oldnum = _rawffi._num_of_allocated_objects()
        a = _rawffi.Array('c')(3)
        assert _rawffi._num_of_allocated_objects() - oldnum == 1
        a.free()
        assert _rawffi._num_of_allocated_objects() - oldnum == 0

    def test_structure(self):
        import _rawffi
        oldnum = _rawffi._num_of_allocated_objects()
        s = _rawffi.Structure([('a', 'i'), ('b', 'i')])()
        assert _rawffi._num_of_allocated_objects() - oldnum == 1
        s.free()
        assert _rawffi._num_of_allocated_objects() - oldnum == 0

    def test_callback(self):
        import _rawffi
        oldnum = _rawffi._num_of_allocated_objects()
        c = _rawffi.CallbackPtr(lambda : 3, [], 'i')
        assert _rawffi._num_of_allocated_objects() - oldnum== 1
        c.free()
        assert _rawffi._num_of_allocated_objects() - oldnum== 0

    def teardown_class(cls):
        Tracker.DO_TRACING = False