# -*- coding: utf-8 -*-
from __future__ import absolute_import

import sys
import warnings


def total_seconds(td):  # pragma: no cover
    return td.total_seconds()


def is_timestamp(value):
    if type(value) == bool:
        return False
    try:
        float(value)
        return True
    except Exception:
        return False


# Python 2.7 / 3.0+ definitions for isstr function.

try:  # pragma: no cover
    basestring

    def isstr(s):
        return isinstance(s, basestring)  # noqa: F821


except NameError:  # pragma: no cover

    def isstr(s):
        return isinstance(s, str)


class list_to_iter_shim(list):
    """ A temporary shim for functions that currently return a list but that will, after a
    deprecation period, return an iteratator.
    """

    def __init__(self, iterable=(), **kwargs):
        """ Equivalent to list(iterable).  warn_text will be emitted on all non-iterator operations.
        """
        self._warn_text = (
            kwargs.pop("warn_text", None)
            or "this object will be converted to an iterator in a future release"
        )
        self._iter_count = 0
        list.__init__(self, iterable, **kwargs)

    def _warn(self):
        warnings.warn(self._warn_text, DeprecationWarning)

    def __iter__(self):
        self._iter_count += 1
        if self._iter_count > 1:
            self._warn()
        return list.__iter__(self)

    def _wrap_method(name):
        list_func = getattr(list, name)

        def wrapper(self, *args, **kwargs):
            self._warn()
            return list_func(self, *args, **kwargs)

        return wrapper

    __contains__ = _wrap_method("__contains__")
    __add__ = _wrap_method("__add__")
    __mul__ = _wrap_method("__mul__")
    __getitem__ = _wrap_method("__getitem__")
    # Ideally, we would throw warnings from  __len__, but list(x) calls len(x)
    index = _wrap_method("index")
    count = _wrap_method("count")
    __setitem__ = _wrap_method("__setitem__")
    __delitem__ = _wrap_method("__delitem__")
    append = _wrap_method("append")
    if sys.version_info.major >= 3:  # pragma: no cover
        clear = _wrap_method("clear")
        copy = _wrap_method("copy")
    extend = _wrap_method("extend")
    __iadd__ = _wrap_method("__iadd__")
    __imul__ = _wrap_method("__imul__")
    insert = _wrap_method("insert")
    pop = _wrap_method("pop")
    remove = _wrap_method("remove")
    reverse = _wrap_method("reverse")
    sort = _wrap_method("sort")

    del _wrap_method


__all__ = ["total_seconds", "is_timestamp", "isstr", "list_to_iter_shim"]