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from __future__ import annotations

from typing import TYPE_CHECKING, Collection, Generic

from .structs import CT, KT, RT, RequirementInformation, State

if TYPE_CHECKING:
    from .resolvers import Criterion

class BaseReporter(Generic[RT, CT, KT]):
    """Delegate class to provider progress reporting for the resolver."""

def starting(self) -> None:
        """Called before the resolution actually starts."""

def starting_round(self, index: int) -> None:
        """Called before each round of resolution starts.

The index is zero-based.
        """

def ending_round(self, index: int, state: State[RT, CT, KT]) -> None:
        """Called before each round of resolution ends.

This is NOT called if the resolution ends at this round. Use `ending`
        if you want to report finalization. The index is zero-based.
        """

def ending(self, state: State[RT, CT, KT]) -> None:
        """Called before the resolution ends successfully."""

def adding_requirement(self, requirement: RT, parent: CT | None) -> None:
        """Called when adding a new requirement into the resolve criteria.

:param requirement: The additional requirement to be applied to filter
            the available candidaites.
        :param parent: The candidate that requires ``requirement`` as a
            dependency, or None if ``requirement`` is one of the root
            requirements passed in from ``Resolver.resolve()``.
        """

def resolving_conflicts(
        self, causes: Collection[RequirementInformation[RT, CT]]
    ) -> None:
        """Called when starting to attempt requirement conflict resolution.

:param causes: The information on the collision that caused the backtracking.
        """

def rejecting_candidate(self, criterion: Criterion[RT, CT], candidate: CT) -> None:
        """Called when rejecting a candidate during backtracking."""

def pinning(self, candidate: CT) -> None:
        """Called when adding a candidate to the potential solution."""

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