"""Capture every manifest change, including translation/import writers."""
import copy
from uuid import uuid4

from sqlalchemy import event, inspect
from sqlalchemy.orm import Session

from app.models import GameVersion, Revision


@event.listens_for(Session, "before_flush")
def capture_revisions(session, flush_context, instances):
    for obj in list(session.new) + list(session.dirty):
        if not isinstance(obj, GameVersion) or not obj.manifest or obj in session.deleted:
            continue
        if obj not in session.new and not inspect(obj).attrs.manifest.history.has_changes():
            continue
        parents = list(getattr(obj, "_revision_parents", None) or
                       ([obj.revision_id] if obj.revision_id else []))
        rid = str(uuid4())
        session.add(Revision(id=rid, game_id=obj.game_id, user_id=session.info.get("user_id", obj.owner_id),
                             parents=parents, manifest=copy.deepcopy(obj.manifest)))
        obj.revision_id = rid
        obj._revision_parents = None