import json, os, sys, uuid, urllib.parse, urllib.request, urllib.error

REST = "https://api.pagerduty.com"
EVENTS = "https://events.pagerduty.com/v2/enqueue"


def _cfg():
    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))


def _inputs():
    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))


def rest(method, path, cfg, body=None, params=None, extra_headers=None):
    url = REST + path
    if params:
        clean = {k: v for k, v in params.items() if v not in (None, "")}
        if clean:
            url += "?" + urllib.parse.urlencode(clean, doseq=True)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {
        "Authorization": "Token token=" + str(cfg.get("api_token", "")),
        "Accept": "application/vnd.pagerduty+json;version=2",
    }
    if data is not None:
        headers["Content-Type"] = "application/json"
    if extra_headers:
        headers.update(extra_headers)
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=60) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def events_enqueue(cfg, payload):
    data = json.dumps(payload).encode("utf-8")
    req = urllib.request.Request(EVENTS, data=data, headers={"Content-Type": "application/json"}, method="POST")
    with urllib.request.urlopen(req, timeout=60) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def _run(fn):
    try:
        print(json.dumps(fn(_cfg(), _inputs())))
    except urllib.error.HTTPError as e:
        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
        sys.exit(1)
    except Exception as e:
        print(json.dumps({"error": str(e)}))
        sys.exit(1)


def main(cfg, inputs):
    if not cfg.get("routing_key"):
        raise Exception("routing_key is not configured")

    summary = str(inputs.get("summary", "")).strip()
    if not summary:
        raise Exception("summary is required")

    source = str(inputs.get("source", "")).strip()
    if not source:
        raise Exception("source is required")

    severity = str(inputs.get("severity", "") or "critical").strip()
    if severity not in ("critical", "error", "warning", "info"):
        severity = "critical"

    dedup_key = str(inputs.get("dedup_key", "") or "").strip()
    component = str(inputs.get("component", "") or "").strip()

    payload = {
        "summary": summary,
        "source": source,
        "severity": severity,
    }
    if component:
        payload["component"] = component

    event = {
        "routing_key": cfg["routing_key"],
        "event_action": "trigger",
        "payload": payload,
    }
    if dedup_key:
        event["dedup_key"] = dedup_key

    return events_enqueue(cfg, event)


_run(main)