import gettext
import ifcopenshell
import ifcopenshell.express
import ifcopenshell.util
import ifcopenshell.util.element


class IfcFile(object):
    file = None
    bookmarks = {}

    @classmethod
    def load(cls, path=None):
        cls.file = ifcopenshell.open(path)
        if not cls.file:
            assert False
    
    @classmethod
    def load_schema(cls, path=None):
        schema = ifcopenshell.express.parse(path)
        ifcopenshell.register_schema(schema)

    @classmethod
    def get(cls):
        if not cls.file:
            assert False, "No file was loaded, so this requirement cannot be checked"
        return cls.file

    @classmethod
    def by_guid(cls, guid):
        try:
            return cls.get().by_guid(guid)
        except:
            assert False, "An element with the ID {} could not be found.".format(guid)
    
    @classmethod
    def by_type(cls, ifc_type):
        return cls.get().by_type(ifc_type.strip())

    @classmethod
    def by_types(cls, ifc_types):
        elements = []
        for ifc_type in ifc_types.split(","):
            elements += cls.by_type(ifc_type.strip())
        return elements


def assert_number(number):
    try:
        return float(number)
    except ValueError:
        assert False, "A number should be specified, not {}".format(number)


def assert_type(element, ifc_class, is_exact=False):
    if is_exact:
        assert element.is_a() == ifc_class, "The element {} is an {} instead of {}.".format(
            element, element.is_a(), ifc_class
        )
    else:
        assert element.is_a(ifc_class), "The element {} is an {} instead of {}.".format(
            element, element.is_a(), ifc_class
        )


def assert_attribute(element, name, value=None):
    if not hasattr(element, name):
        assert False, "The element {} does not have the attribute {}".format(element, name)
    if not value:
        if getattr(element, name) is None:
            assert False, "The element {} does not have a value for the attribute {}".format(element, name)
        return getattr(element, name)
    if value == "NULL":
        value = None
    actual_value = getattr(element, name)
    if isinstance(value, list) and actual_value:
        actual_value = list(actual_value)
    assert actual_value == value, 'We expected a value of "{}" but instead got "{}" for the element {}'.format(
        value, actual_value, element
    )


def assert_pset(element, pset_name, prop_name=None, value=None):
    if value == "NULL":
        value = None
    psets = ifcopenshell.util.element.get_psets(site)
    if pset_name not in psets:
        assert False, "The element {} does not have a property set named {}".format(element, pset_name)
    if prop_name is None:
        return psets[pset_name]
    if prop_name not in psets[pset_name]:
        assert False, 'The element {} does not have a property named "{}" in the pset "{}"'.format(
            element, prop_name, pset_name
        )
    if value is None:
        return psets[pset_name][prop_name]
    actual_value = psets[pset_name][prop_name]
    assert actual_value == value, 'We expected a value of "{}" but instead got "{}" for the element {}'.format(
        value, actual_value, element
    )


def assert_elements(
    ifc_class,
    elemcount,
    falsecount,
    falseelems,
    message_all_falseelems,
    message_some_falseelems,
    message_no_elems,
    parameter=None
):
    if elemcount > 0 and falsecount == 0:
        return  # Test OK
    elif elemcount == 0:
        assert False, (
            message_no_elems.format(
                ifc_class=ifc_class
            )
        )
    elif falsecount == elemcount:
        if parameter is None:
            assert False, (
                message_all_falseelems.format(
                    elemcount=elemcount,
                    ifc_class=ifc_class
                )
            )
        else:
            assert False, (
                message_all_falseelems.format(
                    elemcount=elemcount,
                    ifc_class=ifc_class,
                    parameter=parameter
                )
            )
    elif falsecount > 0 and falsecount < elemcount:
        if parameter is None:
            assert False, (
                message_some_falseelems.format(
                    falsecount=falsecount,
                    elemcount=elemcount,
                    ifc_class=ifc_class,
                    falseelems=falseelems,
                )
            )
        else:
            assert False, (
                message_some_falseelems.format(
                    falsecount=falsecount,
                    elemcount=elemcount,
                    ifc_class=ifc_class,
                    falseelems=falseelems,
                    parameter=parameter
                )
            )
    else:
        assert False, _("Error in falsecount, something went wrong.")


def switch_locale(locale_dir, locale_id="en"):
    newlang = gettext.translation(
        "messages",
        localedir=locale_dir,
        languages=[locale_id]
    )
    newlang.install()