"""Chronicle CloudEvents client. Optional per GSAP §1.4."""
import hashlib, json, logging
from datetime import datetime, UTC
import httpx
from gsap_broker.settings import settings

logger = logging.getLogger(__name__)

async def emit(kind: str, payload: dict) -> str:
    url = settings.chronicle_webhook_url
    if not url:
        return ""
    try:
        event_json = json.dumps({"kind": kind, **payload}, sort_keys=True, default=str)
        cid = "sha256:" + hashlib.sha256(event_json.encode()).hexdigest()
        async with httpx.AsyncClient(timeout=5.0) as client:
            await client.post(url, json={
                "pusher": {"login": payload.get("principal_did", settings.broker_did)},
                "ref": f"refs/gsap/{kind}",
                "repository": {"full_name": "gsap-broker/governance"},
                "commits": [{"message": f"{kind}: {json.dumps(payload, default=str)}"}],
            }, headers={"X-Forgejo-Event": "push"})
        return cid
    except Exception as e:
        logger.warning(f"Chronicle emit failed: {kind}: {e}")
        return ""