"""galaxis-agent webhook server."""
import hashlib
import hmac
import logging

from fastapi import FastAPI, Request, HTTPException

logger = logging.getLogger(__name__)

app = FastAPI(title="galaxis-agent")


def verify_gitea_signature(payload: bytes, signature: str, secret: str) -> bool:
    """Verify Gitea webhook HMAC-SHA256 signature."""
    expected = hmac.new(secret.encode(), payload, hashlib.sha256).hexdigest()
    return hmac.compare_digest(expected, signature)


def generate_thread_id(repo: str, issue_id: int) -> str:
    """Generate deterministic thread ID from issue."""
    raw = hashlib.sha256(f"gitea-issue:{repo}:{issue_id}".encode()).hexdigest()
    return f"{raw[:8]}-{raw[8:12]}-{raw[12:16]}-{raw[16:20]}-{raw[20:32]}"


@app.get("/health")
async def health():
    return {"status": "ok"}


@app.post("/webhooks/gitea")
async def gitea_webhook(request: Request):
    """Gitea webhook endpoint. Full implementation in Phase 3."""
    import os
    body = await request.body()
    signature = request.headers.get("X-Gitea-Signature", "")
    secret = os.environ.get("GITEA_WEBHOOK_SECRET", "")

    if not verify_gitea_signature(body, signature, secret):
        raise HTTPException(status_code=401, detail="Invalid signature")

    logger.info("Gitea webhook received (not yet implemented)")
    return {"status": "received"}