# c_byte: 2 bytes
# c_short: 4 bytes
# c_int: 8 bytes
# c_long: 16 bytes

import ctypes
import os.path
filename = os.path.abspath('libpoint.so')

CoordType = ctypes.c_long

class Point(ctypes.Structure):
    _fields_ = (
        ('x', CoordType),
        ('y', CoordType),
    )

    def __repr__(self):
        return f'<Point x={self.x} y={self.y}>'

libpoint = ctypes.cdll.LoadLibrary(filename)

point_test = libpoint.point_test
point_test.argtypes = ()
point_test.restype = None

point_new = libpoint.point_new
point_new.argtypes = (CoordType, CoordType)
point_new.restype = Point

point_reset_copy = libpoint.point_reset_copy
point_reset_copy.argtypes = (Point,)
point_reset_copy.restype = None

point_reset_ref = libpoint.point_reset_ref
point_reset_ref.argtypes = (ctypes.POINTER(Point),)
point_reset_ref.restype = None

p = point_new(1, 2)
print(f"p = {p!r}")

point_reset_copy(p)
print(f"p = {p!r}")
assert p.x == 1 and p.y == 2

point_reset_ref(p)
print(f"p = {p!r}")
assert p.x == 0 and p.y == 0

point_test()

print("sizeof(Point) = %s bytes" % ctypes.sizeof(p))