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 AdReportingCampaign, AdReportingCampaignCriteria
from dmp.ad_reporting.exceptions import AdReportingCampaignNotFoundError
from dmp.ad_reporting.repositories import AdReportingCampaignRepository
from dmp.ad_reporting.services import AdReportingAccountService


@dataclass(kw_only=True)
class GetAdReportingCampaignRequest(AuthRequest):
    campaign_id: str


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

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

    def handle(self, request: GetAdReportingCampaignRequest) -> AdReportingCampaign:
        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 AdReportingCampaignNotFoundError

        campaigns = self.campaign_repository.find_by_criteria(
            AdReportingCampaignCriteria(
                campaign_ids={request.campaign_id},
                account_ids=set(ad_account_labels.keys()),
            ),
            limit=1,
        )

        try:
            campaign = campaigns[0]
        except IndexError as exc:
            raise AdReportingCampaignNotFoundError from exc

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

        return campaign