from __future__ import annotations
from typing import List

from warchron.constants import ContextType
from warchron.model.exception import ForbiddenOperation
from warchron.model.result_checker import ResultChecker
from warchron.model.war_event import InfluenceGained
from warchron.model.war import War
from warchron.model.campaign import Campaign
from warchron.model.round import Round
from warchron.model.battle import Battle


class ClosureService:

    # Round methods

    @staticmethod
    def check_round_closable(round: Round) -> None:
        if round.is_over:
            raise ForbiddenOperation("Round already closed")
        if not round.all_battles_finished():
            raise ForbiddenOperation(
                "All battles must be finished to close their round"
            )

    @staticmethod
    def apply_battle_outcomes(war: War, campaign: Campaign, battle: Battle) -> None:
        already_granted = any(
            isinstance(e, InfluenceGained) and e.source == f"battle:{battle.sector_id}"
            for e in war.events
        )
        if already_granted:
            return
        base_winner = None
        if battle.winner_id is not None:
            base_winner = campaign.participants[battle.winner_id].war_participant_id
        effective_winner = ResultChecker.get_effective_winner_id(
            war,
            ContextType.BATTLE,
            battle.sector_id,
            base_winner,
        )
        if effective_winner is None:
            return
        sector = campaign.sectors[battle.sector_id]
        if sector.influence_objective_id and war.influence_token:
            war.events.append(
                InfluenceGained(
                    participant_id=effective_winner,
                    amount=1,
                    source=f"battle:{battle.sector_id}",
                )
            )

    @staticmethod
    def finalize_round(round: Round) -> None:
        round.is_over = True

    # Campaign methods

    @staticmethod
    def check_campaign_closable(campaign: Campaign) -> None:
        if campaign.is_over:
            raise ForbiddenOperation("Campaign already closed")
        if not campaign.all_rounds_finished():
            raise ForbiddenOperation(
                "All rounds must be closed to close their campaign"
            )

    @staticmethod
    def finalize_campaign(campaign: Campaign) -> None:
        campaign.is_over = True

    # War methods

    @staticmethod
    def close_war(war: War) -> List[str]:
        if not war.all_campaigns_finished():
            raise RuntimeError("All campaigns must be finished to close their war")
        ties: List[str] = []
        # for campaign in war.campaigns:
        #     # compute score
        #     # if participants have same score
        #         ties.append(
        #             ResolutionContext(
        #                 context_type=ContextType.WAR,
        #                 context_id=war.id,
        #                 participant_ids=[
        #                     war.participants[war_participant_id],
        #                     war.participants[war_participant_id],
        #                 ],
        #             )
        #         )
        if ties:
            return ties
        war.is_over = True
        return []