from __future__ import annotations

from abc import ABC, abstractmethod
from typing import Any

from staplebridge.chemistry.state import StapleState
from staplebridge.data.schemas import BuildingBlock


class PeptidePriorBase(ABC):
    @abstractmethod
    def score_transition(self, old_state: StapleState, new_state: StapleState, context: dict[str, Any] | None = None) -> float:
        pass

    def batch_score_transitions(
        self,
        old_state: StapleState,
        new_states: list[StapleState],
        context: dict[str, Any] | None = None,
    ) -> list[float]:
        """Score N candidate transitions from ``old_state`` at once.

        Default implementation just loops ``score_transition``; heavyweight
        priors (ESM2) override this so they can share one model forward across
        all candidates. Non-sequence-changing candidates are expected to
        return exactly 0.0.
        """
        return [
            self.score_transition(old_state, new, context) for new in new_states
        ]

    def prewarm_requests(
        self, pairs: list[tuple[StapleState, list[StapleState]]]
    ) -> None:
        """Prefetch model outputs for many (z, candidates) pairs at once.

        Default is a noop — heavy priors (ESM2) override this to run one
        batched model forward covering every request across all pairs, so a
        subsequent per-pair ``batch_score_transitions`` call becomes a pure
        cache-lookup.
        """
        del pairs


class AnchorPriorBase(ABC):
    @abstractmethod
    def score_anchor(self, sequence: list[str], anchor_pair: tuple[int, int] | None, context: dict[str, Any] | None = None) -> float:
        pass


class BlockPriorBase(ABC):
    @abstractmethod
    def score_block(
        self,
        sequence: list[str],
        anchor_pair: tuple[int, int] | None,
        block: BuildingBlock | None,
        context: dict[str, Any] | None = None,
    ) -> float:
        pass


class GeometryOracleBase(ABC):
    @abstractmethod
    def ctype(
        self,
        sequence: list[str],
        anchor_pair: tuple[int, int] | None,
        block: BuildingBlock | None,
        *,
        peptide_ca: list[tuple[float, float, float]] | None = None,
    ) -> bool:
        pass

    @abstractmethod
    def cgeom(
        self,
        sequence: list[str],
        anchor_pair: tuple[int, int] | None,
        block: BuildingBlock | None,
        *,
        peptide_ca: list[tuple[float, float, float]] | None = None,
    ) -> float:
        pass