"""Low-cardinality operational metrics; no URLs, query values or user data."""
import os
from prometheus_client import Counter, Histogram, start_http_server

BUCKETS = (.01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 30, 60)
API_CALLS = Counter('magent_api_requests_total', 'API responses by route template', ['method', 'route', 'status'])
API_TIME = Histogram('magent_api_response_seconds', 'Time until response headers (not stream lifetime)', ['method', 'route'], buckets=BUCKETS)
REMOTE_CALLS = Counter('magent_remote_requests_total', 'Logical service client calls', ['service', 'method', 'status'])
REMOTE_TIME = Histogram('magent_remote_response_seconds', 'Logical service client call duration', ['service', 'method'], buckets=BUCKETS)
_server = None

def start_metrics():
    global _server
    if _server is None and os.getenv('MAGENT_METRICS_ENABLED', '').lower() == 'true':
        _server = start_http_server(int(os.getenv('MAGENT_METRICS_PORT', '9108')), addr=os.getenv('MAGENT_METRICS_BIND', '127.0.0.1'))

def record_api(request, status, seconds):
    route = getattr(request.scope.get('route'), 'path', 'unmatched')
    method = request.method if request.method in {'GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS'} else 'OTHER'
    API_CALLS.labels(method, route, str(status)).inc()
    API_TIME.labels(method, route).observe(max(0, seconds))

def record_remote(service, method, status, seconds):
    service = service if service in {'Seerr', 'Jellyfin', 'Sonarr', 'Radarr', 'Bazarr', 'Prowlarr', 'qBittorrent'} else 'Other'
    method = method.upper() if method.upper() in {'GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS'} else 'OTHER'
    REMOTE_CALLS.labels(service, method, str(status)).inc()
    REMOTE_TIME.labels(service, method).observe(max(0, seconds))