"""Prometheus client — queries the HPE P5G Prometheus instance."""

import httpx
from app.config import PROMETHEUS_URL, PROMETHEUS_PREFIX, TARGET_TYPE_MAP, ALL_NFS

_BASE = PROMETHEUS_URL.rstrip("/") + PROMETHEUS_PREFIX


async def query(promql: str) -> list:
    """Run an instant PromQL query, return the result list."""
    async with httpx.AsyncClient(timeout=5) as client:
        r = await client.get(f"{_BASE}/api/v1/query", params={"query": promql})
        r.raise_for_status()
        return r.json()["data"]["result"]


async def get_nf_status_map() -> dict[str, dict]:
    """Return Prometheus-backed NF status keyed by display name."""
    try:
        results = await query("up")
    except Exception:
        return {n: {"name": n, "state": "unknown", "instance": ""} for n in ALL_NFS}

    seen: dict[str, dict] = {}
    for r in results:
        metric = r["metric"]
        target = metric.get("target_type", metric.get("job", "")).lower()
        name = TARGET_TYPE_MAP.get(target)
        if not name:
            continue
        state = "up" if r["value"][1] == "1" else "down"
        # Keep worst state if multiple instances
        if name not in seen or seen[name]["state"] != "down":
            seen[name] = {"name": name, "state": state, "instance": metric.get("instance", "")}

    # Fill in NFs with no Prometheus data
    for n in ALL_NFS:
        if n not in seen:
            seen[n] = {"name": n, "state": "unknown", "instance": ""}

    return seen


async def get_nf_status() -> list:
    """Return a list of {name, state, instance} for every known NF."""
    return list((await get_nf_status_map()).values())