from fastapi import APIRouter
from k8s_client import get_custom_client

router = APIRouter(prefix="/metrics", tags=["metrics"])


@router.get("/nodes")
def node_metrics():
    api = get_custom_client()
    try:
        data = api.list_cluster_custom_object(
            group="metrics.k8s.io", version="v1beta1", plural="nodes"
        )
        return [
            {
                "name": item["metadata"]["name"],
                "cpu_usage": item["usage"]["cpu"],  # e.g. "250m"
                "memory_usage": item["usage"]["memory"],  # e.g. "512Mi"
            }
            for item in data["items"]
        ]
    except Exception as e:
        return {"error": str(e), "hint": "Is metrics-server installed?"}