"""Tiny habitat module adapter stub for NovaPlan MVP.

Represents a second domain agent (habitat life-support) that participates in
the same federated ADMM-like exchange as the rover.
"""
from __future__ import annotations

from nova_plan.planner import LocalProblem, delta_sync, simple_admm_step
from nova_plan.contracts import PlanDelta


def make_local_problem() -> LocalProblem:
    def objective(local_vars, shared_vars):
        return sum(local_vars.values()) - 0.25 * sum(shared_vars.values())

    return LocalProblem(id="habitat-1", objective=objective, variables={"a": 2.0, "b": 1.0})


class HabitatAdapter:
    def __init__(self):
        self.local = make_local_problem()

    def step(self, shared_vars: dict[str, float]) -> PlanDelta:
        simple_admm_step(self.local, shared_vars, rho=1.0)
        return delta_sync(self.local, shared_vars, agent_id=self.local.id, rho=1.0)