from __future__ import annotations

from citygrid import LocalProblem
from citygrid.bridge.energi_bridge import EnergiBridge
from citygrid import __version__ as citygrid_version

class DerControllerAdapter:
    def __init__(self, adapter_id: str = "der-controller-1"):
        self.adapter_id = adapter_id

    def build_local_problem(self) -> LocalProblem:
        # Toy local problem for a DER controller
        return LocalProblem(
            id="lp-der-1",
            domain="electricity",
            assets=["DER-Unit-1"],
            objective={"minimize": ["loss"], "weight": 1.0},
            constraints={"voltage": {"min": 0.95, "max": 1.05}},
            solver_hint=None,
        )

    def receive_delta(self, delta: dict) -> dict:
        # In a real system, this would update internal state. Here we echo the delta.
        return {"ack": True, "delta_version": delta.get("version", 0)}