"""Toy relay module adapter.

This adapter represents a relay node that accepts downlink reservations and
returns feasibility signals. It's intentionally minimal for unit testing.
"""
from typing import Dict, Any
from ..plan_delta import PlanDelta


class RelayModuleAdapter:
    def __init__(self, node_id: str):
        self.node_id = node_id
        self.schedule = []  # simplistic list of reserved windows

    def describe_local_problem(self) -> Dict[str, Any]:
        return {"node_id": self.node_id, "capabilities": ["downlink"]}

    def apply_delta(self, delta: PlanDelta) -> bool:
        # accept 'downlink' commitments and add to schedule
        for c in delta.commitments.value():
            if isinstance(c, dict) and c.get("type") == "downlink":
                self.schedule.append(c)
        return True


def create(node_id: str):
    return RelayModuleAdapter(node_id)