import base64, json, os, sys, urllib.parse, urllib.request, urllib.error

TOKEN_URL = "https://oauth2.googleapis.com/token"
API = "https://gmail.googleapis.com/gmail/v1/users/me"


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


def _token():
    cfg = _cfg()
    refresh = str(cfg.get("refresh_token") or "")
    if not refresh:
        raise Exception("refresh_token is not set — run gmail-single-user-exchange-code and paste it into the config")
    data = urllib.parse.urlencode({
        "client_id": str(cfg.get("client_id") or ""),
        "client_secret": str(cfg.get("client_secret") or ""),
        "refresh_token": refresh,
        "grant_type": "refresh_token",
    }).encode("utf-8")
    req = urllib.request.Request(TOKEN_URL, data=data,
                                 headers={"Content-Type": "application/x-www-form-urlencoded", "Accept": "application/json"},
                                 method="POST")
    with urllib.request.urlopen(req, timeout=60) as r:
        tok = json.loads(r.read())
    if not tok.get("access_token"):
        raise Exception("Token refresh failed: " + json.dumps(tok))
    return tok["access_token"]


def request(method, path, params=None, body=None):
    url = API + path
    q = {k: str(x) for k, x in (params or {}).items() if x not in (None, "")}
    if q:
        url += ("&" if "?" in url else "?") + urllib.parse.urlencode(q)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Accept": "application/json", "Authorization": "Bearer " + _token()}
    if data is not None:
        headers["Content-Type"] = "application/json"
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=90) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def main():
    res = request("GET", "/profile")
    if not res.get("emailAddress"):
        raise Exception("Unexpected response: " + json.dumps(res))
    print(json.dumps({"ok": True, "email": res.get("emailAddress"), "messages_total": res.get("messagesTotal")}))


try:
    main()
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)
