"""Chronicle CloudEvents client — matches fastapi-gsap chronicle pattern."""

import hashlib
import json
import logging
from datetime import datetime, UTC

import httpx

from llm_broker.settings import settings

logger = logging.getLogger(__name__)


async def emit(kind: str, payload: dict) -> str:
    """Post a delegation event to Chronicle. Returns CID or empty string."""
    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("delegator_did", settings.broker_did)},
                "ref": f"refs/llm-broker/{kind}",
                "repository": {"full_name": "llm-broker/delegation"},
                "commits": [{"message": f"{kind}: {json.dumps(payload, default=str)}"}],
            }, headers={"X-Forgejo-Event": "push"})
        return cid
    except Exception as e:
        logger.warning("Chronicle emit failed: %s: %s", kind, e)
        return ""


async def delegation_created(
    delegation_id: str, delegator_did: str, agent_did: str,
    agent_type: str, scope: dict,
) -> str:
    return await emit("DELEGATION_CREATED", {
        "event_code": "0x3001",
        "delegation_id": delegation_id,
        "delegator_did": delegator_did,
        "agent_did": agent_did,
        "agent_type": agent_type,
        "scope": scope,
        "timestamp": datetime.now(UTC).isoformat(),
    })


async def delegation_revoked(delegation_id: str, reason: str) -> str:
    return await emit("DELEGATION_REVOKED", {
        "event_code": "0x3003",
        "delegation_id": delegation_id,
        "reason": reason,
        "timestamp": datetime.now(UTC).isoformat(),
    })


async def delegation_expired(delegation_id: str) -> str:
    return await emit("DELEGATION_EXPIRED", {
        "event_code": "0x3004",
        "delegation_id": delegation_id,
        "timestamp": datetime.now(UTC).isoformat(),
    })