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import operator
from typing import Any

from six import iteritems, string_types

from .utils import AttrDict


class Range(AttrDict):
    OPS = {
        "lt": operator.lt,
        "lte": operator.le,
        "gt": operator.gt,
        "gte": operator.ge,
    }

    def __init__(self, *args: Any, **kwargs: Any) -> None:
        if args and (len(args) > 1 or kwargs or not isinstance(args[0], dict)):
            raise ValueError(
                "Range accepts a single dictionary or a set of keyword arguments."
            )
        data = args[0] if args else kwargs

        for k in data:
            if k not in self.OPS:
                raise ValueError("Range received an unknown operator %r" % k)

        if "gt" in data and "gte" in data:
            raise ValueError("You cannot specify both gt and gte for Range.")

        if "lt" in data and "lte" in data:
            raise ValueError("You cannot specify both lt and lte for Range.")

        super(Range, self).__init__(args[0] if args else kwargs)

    def __repr__(self) -> str:
        return "Range(%s)" % ", ".join("%s=%r" % op for op in iteritems(self._d_))

    def __contains__(self, item: Any) -> bool:
        if isinstance(item, string_types):
            return super(Range, self).__contains__(item)

        for op in self.OPS:
            if op in self._d_ and not self.OPS[op](item, self._d_[op]):
                return False
        return True

    @property
    def upper(self) -> Any:
        if "lt" in self._d_:
            return self._d_["lt"], False
        if "lte" in self._d_:
            return self._d_["lte"], True
        return None, False

    @property
    def lower(self) -> Any:
        if "gt" in self._d_:
            return self._d_["gt"], False
        if "gte" in self._d_:
            return self._d_["gte"], True
        return None, False


__all__ = ["Range"]