"""Planner agent."""

from __future__ import annotations

from typing import Any

from app.common.types import CandidateAction, PolyGuardAction
from app.models.policy.provider_runtime import PolicyProviderRouter, default_provider_preference
from app.models.policy.safety_ranker import rank_candidates


class PlannerAgent:
    name = "PlannerAgent"

    def __init__(self) -> None:
        self.provider_router = PolicyProviderRouter()

    def run(
        self,
        candidates: list[CandidateAction],
        mode: str,
        provider_prompt: dict[str, Any] | None = None,
        provider_preference: tuple[str, ...] | None = None,
    ) -> PolyGuardAction:
        filtered = [c for c in candidates if c.mode.value == mode] or candidates
        selection = self.provider_router.select_candidate(
            candidates=filtered,
            prompt=provider_prompt or {"mode": mode},
            provider_preference=provider_preference or default_provider_preference(),
        )
        by_id = {item.candidate_id: item for item in filtered}
        top = by_id.get(selection.candidate_id, rank_candidates(filtered)[0])
        return PolyGuardAction(
            mode=top.mode,
            action_type=top.action_type,
            target_drug=top.target_drug,
            replacement_drug=top.replacement_drug,
            dose_bucket=top.dose_bucket,
            taper_days=top.taper_days,
            monitoring_plan=top.monitoring_plan,
            candidate_id=top.candidate_id,
            confidence=max(0.45, 1.0 - top.uncertainty_score),
            rationale_brief=selection.rationale,
        )