"""Risk agent acts as leader with veto rights."""
from __future__ import annotations

from app.utils.logging import get_logger

from .base import Agent, AgentAction, AgentContext

LOGGER = get_logger(__name__)
LOG_EXTRA = {"stage": "decision_risk"}


class RiskRecommendation:
    """Represents structured recommendation from the risk agent."""

    __slots__ = ("status", "reason", "recommended_action", "notes")

    def __init__(
        self,
        *,
        status: str,
        reason: str,
        recommended_action: AgentAction | None = None,
        notes: dict | None = None,
    ) -> None:
        self.status = status
        self.reason = reason
        self.recommended_action = recommended_action
        self.notes = notes or {}

    def to_dict(self) -> dict:
        payload = {
            "status": self.status,
            "reason": self.reason,
            "notes": dict(self.notes),
        }
        if self.recommended_action is not None:
            payload["recommended_action"] = self.recommended_action.value
        return payload


class RiskAgent(Agent):
    def __init__(self) -> None:
        super().__init__(name="A_risk")

    def score(self, context: AgentContext, action: AgentAction) -> float:
        # Base risk agent is neutral unless penalties are triggered.
        penalty = context.features.get("risk_penalty", 0.0)
        if action is AgentAction.SELL:
            return min(1.0, 0.6 + penalty)
        if action is AgentAction.HOLD:
            return 0.5
        return max(0.0, 1.0 - penalty)

    def feasible(self, context: AgentContext, action: AgentAction) -> bool:
        if action is AgentAction.SELL:
            return True
        if context.features.get("is_blacklisted", False) and action not in (AgentAction.SELL, AgentAction.HOLD):
            return False
        if context.features.get("is_suspended", False):
            return False
        if context.features.get("limit_up", False) and action not in (AgentAction.SELL, AgentAction.HOLD):
            return False
        if context.features.get("position_limit", False) and action in (AgentAction.BUY_M, AgentAction.BUY_L):
            return False
        return True

    def assess(
        self,
        context: AgentContext,
        decision_action: AgentAction,
        conflict_flag: bool,
    ) -> RiskRecommendation:
        features = dict(context.features or {})
        risk_penalty = float(features.get("risk_penalty") or 0.0)

        def finalize(
            recommendation: RiskRecommendation,
            trigger: str,
        ) -> RiskRecommendation:
            LOGGER.debug(
                "风险代理评估 ts_code=%s action=%s status=%s reason=%s trigger=%s penalty=%.3f conflict=%s",
                context.ts_code,
                decision_action.value,
                recommendation.status,
                recommendation.reason,
                trigger,
                risk_penalty,
                conflict_flag,
                extra=LOG_EXTRA,
            )
            return recommendation

        if bool(features.get("is_suspended")):
            return finalize(
                RiskRecommendation(
                    status="blocked",
                    reason="suspended",
                    recommended_action=AgentAction.HOLD,
                    notes={"trigger": "is_suspended"},
                ),
                "is_suspended",
            )

        if bool(features.get("is_blacklisted")):
            fallback = AgentAction.SELL if decision_action is AgentAction.SELL else AgentAction.HOLD
            return finalize(
                RiskRecommendation(
                    status="blocked",
                    reason="blacklist",
                    recommended_action=fallback,
                    notes={"trigger": "is_blacklisted"},
                ),
                "is_blacklisted",
            )

        if bool(features.get("limit_up")) and decision_action in {
            AgentAction.BUY_S,
            AgentAction.BUY_M,
            AgentAction.BUY_L,
        }:
            return finalize(
                RiskRecommendation(
                    status="blocked",
                    reason="limit_up",
                    recommended_action=AgentAction.HOLD,
                    notes={"trigger": "limit_up"},
                ),
                "limit_up",
            )

        if bool(features.get("position_limit")) and decision_action in {
            AgentAction.BUY_M,
            AgentAction.BUY_L,
        }:
            return finalize(
                RiskRecommendation(
                    status="pending_review",
                    reason="position_limit",
                    recommended_action=AgentAction.BUY_S,
                    notes={"trigger": "position_limit"},
                ),
                "position_limit",
            )

        if risk_penalty >= 0.9 and decision_action in {
            AgentAction.BUY_S,
            AgentAction.BUY_M,
            AgentAction.BUY_L,
        }:
            return finalize(
                RiskRecommendation(
                    status="blocked",
                    reason="risk_penalty_extreme",
                    recommended_action=AgentAction.HOLD,
                    notes={"risk_penalty": risk_penalty},
                ),
                "risk_penalty_extreme",
            )
        if risk_penalty >= 0.7 and decision_action in {
            AgentAction.BUY_S,
            AgentAction.BUY_M,
            AgentAction.BUY_L,
        }:
            return finalize(
                RiskRecommendation(
                    status="pending_review",
                    reason="risk_penalty_high",
                    recommended_action=AgentAction.HOLD,
                    notes={"risk_penalty": risk_penalty},
                ),
                "risk_penalty_high",
            )

        if conflict_flag:
            return finalize(
                RiskRecommendation(
                    status="pending_review",
                    reason="conflict_threshold",
                ),
                "conflict_threshold",
            )

        return finalize(
            RiskRecommendation(status="ok", reason="clear"),
            "clear",
        )