import pytest

from ..helpers import Suite

TYPE_LIST = ['f32', 'f64']

TEST_LIST = [
    ('10.0 / 8.0', 1.25, ),

    # WebAssembly dictates that float division follows the IEEE rules
    # https://www.w3.org/TR/wasm-core-1/#-hrefop-fdivmathrmfdiv_n-z_1-z_2
    ('10.0 / 0.0', float('+inf') , ),
    ('-10.0 / 0.0', float('-inf') , ),

    ( 'ceil(4.5)',   5.0, ),
    ( 'ceil(4.75)',  5.0, ),
    ( 'ceil(5.0)',   5.0, ),
    ( 'ceil(5.25)',  6.0, ),
    ( 'ceil(5.5)',   6.0, ),
    ('ceil(-4.5)',  -4.0, ),
    ('ceil(-4.75)', -4.0, ),
    ('ceil(-5.0)' , -5.0, ),
    ('ceil(-5.25)', -5.0, ),
    ('ceil(-5.5)',  -5.0, ),

    ( 'floor(4.5)',   4.0, ),
    ( 'floor(4.75)',  4.0, ),
    ( 'floor(5.0)',   5.0, ),
    ( 'floor(5.25)',  5.0, ),
    ( 'floor(5.5)',   5.0, ),
    ('floor(-4.5)',  -5.0, ),
    ('floor(-4.75)', -5.0, ),
    ('floor(-5.0)' , -5.0, ),
    ('floor(-5.25)', -6.0, ),
    ('floor(-5.5)',  -6.0, ),

    ( 'trunc(4.5)',   4.0, ),
    ( 'trunc(4.75)',  4.0, ),
    ( 'trunc(5.0)',   5.0, ),
    ( 'trunc(5.25)',  5.0, ),
    ( 'trunc(5.5)',   5.0, ),
    ('trunc(-4.5)',  -4.0, ),
    ('trunc(-4.75)', -4.0, ),
    ('trunc(-5.0)' , -5.0, ),
    ('trunc(-5.25)', -5.0, ),
    ('trunc(-5.5)',  -5.0, ),

    ( 'nearest(4.5)',   4.0, ),
    ( 'nearest(4.75)',  5.0, ),
    ( 'nearest(5.0)',   5.0, ),
    ( 'nearest(5.25)',  5.0, ),
    ( 'nearest(5.5)',   6.0, ),
    ('nearest(-4.5)',  -4.0, ),
    ('nearest(-4.75)', -5.0, ),
    ('nearest(-5.0)',  -5.0, ),
    ('nearest(-5.25)', -5.0, ),
    ('nearest(-5.5)',  -6.0, ),
]

@pytest.mark.integration_test
@pytest.mark.parametrize('type_', TYPE_LIST)
@pytest.mark.parametrize('test_in,test_out', TEST_LIST)
def test_fractional(type_, test_in, test_out):
    code_py = f"""
@exported
def testEntry() -> {type_}:
    return {test_in}
"""

    result = Suite(code_py).run_code()

    assert test_out == result.returned_value
    assert isinstance(result.returned_value, float)