import enum
from abc import ABC, abstractmethod
from dataclasses import dataclass
from typing import Iterator
from ..common import DeviceKind, Circuit


class ResultPriority(enum.Enum):
    """
    The priority of the result.
    """

    LESS_DEVICES = enum.auto()
    """Less devices is the first priority."""
    MORE_ACCURACY = enum.auto()
    """More accuracy is the first priority."""


@dataclass
class ResolverRequest:
    """
    All request infomation for the resolver.
    """

    device_kind: DeviceKind
    """The kind of device to resolve."""
    target_value: float
    """The target value of the device."""
    tolerance: float
    """The tolerance of the device in absolute value."""
    result_priority: ResultPriority
    """The priority of the result."""
    count_limit: int
    """The limited count of results."""


class Resolver(ABC):
    """
    Abstract base class for all resolvers.
    """

    @abstractmethod
    def resolve(self, request: ResolverRequest) -> Iterator[Circuit]:
        pass