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

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

    from_email = str(cfg.get("from_email", "") or "").strip()
    if not from_email:
        raise Exception("from_email must be configured to add notes")

    return rest(
        "POST",
        "/incidents/" + urllib.parse.quote(incident_id, safe="") + "/notes",
        cfg,
        body={"note": {"content": note}},
        extra_headers={"From": from_email},
    )


_run(main)