# Copyright (c) 2019-2020 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2019-2020 Claudiu Popa <pcmanticore@gmail.com>

# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER


"""Different utilities for the numpy brains"""


import astroid


def infer_numpy_member(src, node, context=None):
    node = astroid.extract_node(src)
    return node.infer(context=context)


def _is_a_numpy_module(node: astroid.node_classes.Name) -> bool:
    """
    Returns True if the node is a representation of a numpy module.

    For example in :
        import numpy as np
        x = np.linspace(1, 2)
    The node <Name.np> is a representation of the numpy module.

    :param node: node to test
    :return: True if the node is a representation of the numpy module.
    """
    module_nickname = node.name
    potential_import_target = [
        x for x in node.lookup(module_nickname)[1] if isinstance(x, astroid.Import)
    ]
    for target in potential_import_target:
        if ("numpy", module_nickname) in target.names:
            return True
    return False


def looks_like_numpy_member(
    member_name: str, node: astroid.node_classes.NodeNG
) -> bool:
    """
    Returns True if the node is a member of numpy whose
    name is member_name.

    :param member_name: name of the member
    :param node: node to test
    :return: True if the node is a member of numpy
    """
    if (
        isinstance(node, astroid.Attribute)
        and node.attrname == member_name
        and isinstance(node.expr, astroid.Name)
        and _is_a_numpy_module(node.expr)
    ):
        return True
    if (
        isinstance(node, astroid.Name)
        and node.name == member_name
        and node.root().name.startswith("numpy")
    ):
        return True
    return False
