from dataclasses import dataclass

from anydi import singleton
from fansifter_common.auth.requests import AuthRequest
from fansifter_common.auth.services import AuthService
from fansifter_common.auth.types import Permission

from dmp.ad_reporting.dtos import AdReportingAd, AdReportingAdCriteria
from dmp.ad_reporting.exceptions import AdReportingAdNotFoundError
from dmp.ad_reporting.repositories import AdReportingAdRepository
from dmp.ad_reporting.services import AdReportingAccountService


@dataclass(kw_only=True)
class GetAdReportingAdRequest(AuthRequest):
    ad_id: str


@singleton
class GetAdReportingAdHandler:
    permission = Permission("ad_campaign", "view")

    def __init__(
        self,
        auth_service: AuthService,
        ad_repository: AdReportingAdRepository,
        account_service: AdReportingAccountService,
    ) -> None:
        self.auth_service = auth_service
        self.ad_repository = ad_repository
        self.account_service = account_service

    def handle(self, request: GetAdReportingAdRequest) -> AdReportingAd:
        account_access = self.auth_service.authorize_for_permission(
            request.identity_id,
            permission=self.permission,
        )

        ad_account_labels = self.account_service.get_allowed_ad_account_labels(
            account_access
        )

        if not ad_account_labels:
            raise AdReportingAdNotFoundError

        ads = self.ad_repository.find_by_criteria(
            AdReportingAdCriteria(
                ad_ids={request.ad_id},
                account_ids=set(ad_account_labels.keys()),
            ),
            limit=1,
        )

        try:
            ad = ads[0]
        except IndexError as exc:
            raise AdReportingAdNotFoundError from exc

        # Prefetch label ad accounts
        ad.accounts = ad_account_labels.get(ad.account_id, set())

        return ad