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

MAX_PAGE = 100   # the API caps `size` at 100
PAGE_CAP = 50    # backstop on the page walk, so a runaway target cannot loop forever


def _cfg():
    s = json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
    region = str(s.get("region") or "us").strip().lower()
    base = "https://" + region + ".api.insight.rapid7.com/"
    headers = {"X-Api-Key": s.get("api_key", ""), "Content-Type": "application/json", "Accept": "application/json"}
    return base, headers


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


def request(method, path, params=None):
    base, headers = _cfg()
    url = base + path.lstrip("/")
    if params:
        clean = {k: v for k, v in params.items() if v not in (None, "")}
        if clean:
            url += ("&" if "?" in url else "?") + urllib.parse.urlencode(clean, doseq=True)
    req = urllib.request.Request(url, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=90) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def run():
    inp = _inputs()
    target = str(inp.get("investigation_id") or "").strip()
    if not target:
        raise ValueError("investigation_id is required: the RRN of the investigation to read comments from")
    if not target.startswith("rrn:"):
        raise ValueError(
            "investigation_id must be an RRN (rrn:investigation:<region>:<org>:investigation:<id>), "
            "not the short investigation ID: the Comments API targets a resource by RRN. Got " + repr(target)
        )
    sort_direction = str(inp.get("sort_direction") or "DESC").strip().upper()
    if sort_direction not in ("ASC", "DESC"):
        sort_direction = "DESC"
    all_results = str(inp.get("all_results") or "false").strip().lower() in ("1", "true", "yes")
    limit = int(inp.get("limit") or 50)
    page_size = min(int(inp.get("page_size") or MAX_PAGE), MAX_PAGE)
    index = int(inp.get("index") or 0)

    data, metadata, pages = [], {}, 0
    while pages < PAGE_CAP:
        out = request("GET", "idr/v1/comments", params={
            "target": target,
            "index": index,
            "size": page_size,
            "sortDirection": sort_direction,
        })
        metadata = out.get("metadata") or {}
        page = out.get("data") or []
        data.extend(page)
        pages += 1
        index += 1
        total_pages = int(metadata.get("total_pages") or 0)
        if not page or index >= total_pages:
            break
        if not all_results and len(data) >= limit:
            break
    if not all_results:
        data = data[:limit]
    print(json.dumps({"target": target, "comment": data, "metadata": metadata}))


try:
    run()
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)