"""
Agent Q3 [HQ] — Metrics
Prometheus-compatible /metrics endpoint + internal tracking.
"""
import time
from collections import defaultdict

_counters = defaultdict(int)
_latencies = defaultdict(list)
_start_time = time.time()

def track_request(target: str, latency_s: float):
    _counters[f"requests_total_{target}"] += 1
    _latencies[target].append(latency_s)

def get_metrics() -> dict:
    uptime = time.time() - _start_time
    avg_latency = {
        t: round(sum(v)/len(v), 3) if v else 0
        for t, v in _latencies.items()
    }
    return {
        "uptime_seconds": round(uptime, 1),
        "request_counts": dict(_counters),
        "avg_latency_seconds": avg_latency,
    }

def prometheus_format() -> str:
    lines = [f"# Agent Q3 [HQ] Metrics\nagentq3_uptime_seconds {round(time.time()-_start_time,1)}"]
    for k, v in _counters.items():
        lines.append(f"agentq3_{k} {v}")
    return "\n".join(lines)