from sqlalchemy.ext.asyncio import AsyncSession

from app.core.contracts import RequestContext
from app.core.errors import InvalidStateError
from app.service.authorization_service import AuthorizationService
from app.service.config_release_service import ConfigReleaseError, ConfigReleaseService


class ConfigApplicationService:
    def __init__(self, session: AsyncSession) -> None:
        self.session = session

    async def transition(
        self, release_id: int, action: str, context: RequestContext
    ) -> dict[str, object]:
        permission = {"submit_for_review": "config:write", "approve": "config:review",
                      "activate": "config:activate", "rollback": "config:activate"}[action]
        await AuthorizationService.require(context, permission, admin=True)
        service = ConfigReleaseService(self.session)
        try:
            async with self.session.begin():
                release = await getattr(service, action)(release_id, int(context.user_id))
        except ConfigReleaseError as exc:
            raise InvalidStateError(str(exc)) from exc
        return {"data": {"release_id": str(release.id), "release_no": release.release_no,
                         "status": release.status}}