from warchron.constants import ContextType
from warchron.model.war import War
from warchron.model.war_event import TieResolved


class ResultChecker:
    @staticmethod
    def get_effective_winner_id(
        war: War,
        context_type: ContextType,
        context_id: str,
        base_winner_id: str | None,
    ) -> str | None:
        if base_winner_id is not None:
            return base_winner_id
        for ev in reversed(war.events):
            if (
                isinstance(ev, TieResolved)
                and ev.context_type == context_type
                and ev.context_id == context_id
            ):
                return ev.participant_id  # None if confirmed draw

        return None