Dict,

    FrozenSet,

    Generic,

    Iterable,

    Iterator,

    Mapping,

    Optional,

    Sequence,

    Type,

    TypeVar,

)

from ..beancount_types import (

    Account,

    Directive,

    MetaKey,

    MetaValue,

    MetaValueEnum,

    Transaction,

)

### CONSTANTS

# I expect these will become configurable in the future, which is why I'm

# keeping them outside of a class, but for now constants will do.

# The default stop date leaves a little room after so it's easy to test

# dates past the far end of the range.

DEFAULT_STOP_DATE: datetime.date = datetime.date(datetime.MAXYEAR, 1, 1)

### TYPE DEFINITIONS

HookName = str

Entry = TypeVar('Entry', bound=Directive)

class Hook(Generic[Entry], metaclass=abc.ABCMeta):

    DIRECTIVE: Type[Directive]

    HOOK_GROUPS: FrozenSet[HookName] = frozenset()

    def __init__(self, config: configmod.Config) -> None:

        pass

        # Subclasses that need configuration should override __init__ to check

        # and store it.

    @abc.abstractmethod

    def run(self, entry: Entry) -> errormod.Iter: ...

### HELPER CLASSES