from ._base import Descriptor

__all__ = (
    "AromaticAtomsCount", "AromaticBondsCount",
)


class AromaticBase(Descriptor):
    __slots__ = ()

    @classmethod
    def preset(cls):
        yield cls()

    def __str__(self):
        return self._name

    def parameters(self):
        return ()

    rtype = int


class AromaticAtomsCount(AromaticBase):
    r"""aromatic atoms count descriptor."""

    __slots__ = ()
    _name = "nAromAtom"

    def description(self):
        return "aromatic atoms count"

    def calculate(self):
        return sum(
            1
            for a in self.mol.GetAtoms()
            if a.GetIsAromatic()
        )


class AromaticBondsCount(AromaticBase):
    r"""aromatic bonds count descriptor."""

    __slots__ = ()
    _name = "nAromBond"

    def description(self):
        return "aromatic bonds count"

    def calculate(self):
        return sum(
            1
            for b in self.mol.GetBonds()
            if b.GetIsAromatic()
        )
