"""Price feed adapter for BeVault."""
from __future__ import annotations

import hashlib
from dataclasses import dataclass
from typing import Optional

from ..bridge import canonical_payload, to_canonical_ir
from ..core import HedgeDelta, LocalArbProblem, SharedSignals


@dataclass
class PriceFeedAdapter:
    name: str = "price-feed-v1"
    version: str = "1.0"

    def generate_signal(self, asset: str, price: float, latency_ms: float) -> SharedSignals:
        return SharedSignals(asset=asset, price=price, latency_ms=latency_ms)

    def build_delta(
        self,
        local: LocalArbProblem,
        signals: SharedSignals,
        hedge_size: Optional[float] = None,
    ) -> HedgeDelta:
        hedge_size = signals.price if hedge_size is None else hedge_size
        ir = to_canonical_ir(local, signals)
        audit_ref = hashlib.sha256(canonical_payload(ir).encode("utf-8")).hexdigest()
        return HedgeDelta(
            asset=local.asset,
            hedge_size=hedge_size,
            timestamp=signals.timestamp,
            policy_tag="price-feed",
            audit_ref=audit_ref,
        )

    def conformance_contract(self) -> dict:
        return {
            "name": self.name,
            "version": self.version,
            "produces": ["SharedSignals", "HedgeDelta"],
        }


__all__ = ["PriceFeedAdapter"]