import hashlib
from datetime import datetime, timezone
from .. import repo
from ..safe_fetch import safe_fetch

NAME = "sync.source_doc"


def _sha(data):
    return hashlib.sha256(data).hexdigest()


def handle(job_data: dict) -> dict:
    sd_id = job_data["source_doc_id"]
    doc = repo.get_source_doc(sd_id)
    if not doc:
        return {"skipped": "gone"}
    body = safe_fetch(doc["upstream_url"], headers={"User-Agent": "void-ingest/2.0"})
    new_sha = _sha(body)
    old_sha = ((doc.get("metadata") or {}).get("body_sha"))
    now = datetime.now(timezone.utc)
    if new_sha == old_sha:
        repo.update_source_doc(sd_id, last_synced=now)
        return {"unchanged": True}
    text = body.decode("utf-8", errors="replace")[:1_000_000]
    repo.update_source_doc(
        sd_id,
        body_text=text,
        last_synced=now,
        metadata_patch={"body_sha": new_sha}
    )
    return {"updated": True, "chars": len(text)}