"""Toy habitat module adapter.

The HabitatAdapter provides a simple mapping for habitat-style LocalProblem
instances and produces small PlanDelta objects. It serves as a complementary
example adapter to the rover planner.
"""
from dataclasses import dataclass
from typing import Dict, Any

from ..core import LocalProblem, PlanDelta


@dataclass
class HabitatAdapter:
    name: str = "habitat_module"

    def to_canonical(self, lp: LocalProblem) -> Dict[str, Any]:
        return {
            "adapter": self.name,
            "id": lp.id,
            "domain": lp.domain,
            "assets_count": len(lp.assets or {}),
            "constraints": lp.constraints,
        }

    def propose_delta(self, lp: LocalProblem, author: str = "habitat") -> PlanDelta:
        # Simple policy: if any safety constraint mentions 'no_move', emit
        # a delta that pauses movement; otherwise, propose a nominal plan.
        delta = {}
        for c in lp.constraints:
            if "no_move" in c:
                delta["action"] = "pause"
                delta["reason"] = "safety_constraint"
                break
        else:
            delta["action"] = "nominal"

        return PlanDelta(delta=delta, author=author, contract_id=lp.id)