from util import fncptr_from_c_script, may_spawn_proc
import ctypes
import pytest

def within_err(res, exp, err=1e15):
    return abs(res - exp) < err


@may_spawn_proc
def test_double_add():
    fnp, _ = fncptr_from_c_script("test_double_add.c", "test_fnc", restype=ctypes.c_double)
    assert fnp() == 5.859873

@may_spawn_proc
def test_double_sub():
    fnp, _ = fncptr_from_c_script("test_double_sub.c", "test_fnc", restype=ctypes.c_double)
    assert within_err(fnp(), 0.423313)

@may_spawn_proc
def test_double_mul():
    fnp, _ = fncptr_from_c_script("test_double_mul.c", "test_fnc", restype=ctypes.c_double)
    assert fnp() == 8.53972942004

@may_spawn_proc
def test_double_div():
    fnp, _ = fncptr_from_c_script("test_double_div.c", "test_fnc", restype=ctypes.c_double)
    assert within_err(fnp(), 1.1557282546316052)

@may_spawn_proc
def test_double_ordered_eq():
    fnp, _ = fncptr_from_c_script("test_double_ordered_eq.c", "test_fnc")
    assert fnp() == 0

@may_spawn_proc
def test_double_ordered_ne():
    fnp, _ = fncptr_from_c_script("test_double_ordered_ne.c", "test_fnc")
    assert fnp() == 1

@may_spawn_proc
def test_double_ordered_lt():
    fnp, _ = fncptr_from_c_script("test_double_ordered_lt.c", "test_fnc")
    assert fnp() == 1

@may_spawn_proc
def test_double_ordered_le():
    fnp, _ = fncptr_from_c_script("test_double_ordered_le.c", "test_fnc")
    assert fnp() == 1

@may_spawn_proc
def test_double_ordered_ge():
    fnp, _ = fncptr_from_c_script("test_double_ordered_ge.c", "test_fnc")
    assert fnp() == 1

@may_spawn_proc
def test_double_ordered_gt():
    fnp, _ = fncptr_from_c_script("test_double_ordered_gt.c", "test_fnc")
    assert fnp() == 1

@may_spawn_proc
def test_double_arg_pass():
    fnp, _ = fncptr_from_c_script("test_double_arg_pass.c", "test_fnc",
                               [ctypes.c_double, ctypes.c_double], ctypes.c_double)
    assert fnp(3.141593, 2.71828) == 5.859873

@may_spawn_proc
def test_double_sitofp():
    fnp, _ = fncptr_from_c_script("test_double_sitofp.c", "test_fnc", restype=ctypes.c_double)
    assert fnp() == -42.0


@pytest.mark.xfail(reason='not implemented yet')
@may_spawn_proc
def test_double_uitofp():
    fnp, _ = fncptr_from_c_script("test_double_uitofp.c", "test_fnc", restype=ctypes.c_double)
    assert fnp() == 42.0

@may_spawn_proc
def test_double_fptosi():
    fnp, _ = fncptr_from_c_script("test_double_fptosi.c", "test_fnc", restype=ctypes.c_int64)
    assert fnp() == -3


@pytest.mark.xfail(reason='not implemented yet')
@may_spawn_proc
def test_double_fptoui():
    fnp, _ = fncptr_from_c_script("test_double_fptoui.c", "test_fnc", restype=ctypes.c_uint64)
    assert fnp() == 3