"""API properties.

"""

from __future__ import print_function
from __future__ import unicode_literals
from tabulate import tabulate, tabulate_formats, simple_separated_format
from platform import python_version_tuple
from common import SkipTest


try:
    if python_version_tuple() >= ("3", "3", "0"):
        from inspect import signature, _empty
    else:
        signature = None
        _empty = None
except ImportError:
    signature = None
    _empty = None


def test_tabulate_formats():
    "API: tabulate_formats is a list of strings" ""
    supported = tabulate_formats
    print("tabulate_formats = %r" % supported)
    assert type(supported) is list
    for fmt in supported:
        assert type(fmt) is type("")  # noqa


def _check_signature(function, expected_sig):
    if not signature:
        raise SkipTest()
    actual_sig = signature(function)
    print("expected: %s\nactual: %s\n" % (expected_sig, str(actual_sig)))
    for (e, ev), (a, av) in zip(expected_sig, actual_sig.parameters.items()):
        assert e == a and ev == av.default


def test_tabulate_signature():
    "API: tabulate() type signature is unchanged" ""
    assert type(tabulate) is type(lambda: None)  # noqa
    expected_sig = [
        ("tabular_data", _empty),
        ("headers", ()),
        ("tablefmt", "simple"),
        ("floatfmt", "g"),
        ("numalign", "decimal"),
        ("stralign", "left"),
        ("missingval", ""),
    ]
    _check_signature(tabulate, expected_sig)


def test_simple_separated_format_signature():
    "API: simple_separated_format() type signature is unchanged" ""
    assert type(simple_separated_format) is type(lambda: None)  # noqa
    expected_sig = [("separator", _empty)]
    _check_signature(simple_separated_format, expected_sig)