from dataclasses import dataclass

from anydi import singleton
from fansifter_common.auth.identity import Identity
from fansifter_common.auth.services import AuthService
from fansifter_common.auth.types import Permission

from dmp.adapters.features import (
    AUDIENCE_SHOW_ADD_SECONDARY_FANS_TOGGLE,
    AUDIENCE_SHOW_SMS_CAMPAIGNS_PAGE,
    Features,
)
from dmp.audiences.enums import AudienceTarget
from dmp.audiences.exceptions import AudienceTargetNotSupportedError
from dmp.audiences.models import Audience
from dmp.audiences.services import AudienceService


@dataclass
class GetAudienceRequest:
    identity: Identity
    audience_id: str


@singleton
class GetAudienceHandler:
    ad_target_permission = Permission("audience", "view_ad_target")
    email_target_permission = Permission("audience", "view_email_target")
    text_target_permission = Permission("audience", "view_text_target")

    def __init__(
        self,
        auth_service: AuthService,
        audience_service: AudienceService,
        features: Features,
    ) -> None:
        self.auth_service = auth_service
        self.audience_service = audience_service
        self.features = features

    def handle(self, request: GetAudienceRequest) -> Audience:
        audience = self.audience_service.get_audience(request.audience_id)

        match audience.target:
            case AudienceTarget.EMAIL:
                self.auth_service.check_account_resource(
                    request.identity.id,
                    account=audience.account,
                    permission=self.email_target_permission,
                    resource_id=audience.id,
                )
            case AudienceTarget.ADS:
                self.auth_service.check_account_resource(
                    request.identity.id,
                    account=audience.account,
                    permission=self.ad_target_permission,
                    resource_id=audience.id,
                )
            case AudienceTarget.TEXT if self.features.is_on_for_identity(
                feature_flag_name=AUDIENCE_SHOW_SMS_CAMPAIGNS_PAGE,
                identity_id=request.identity.id,
            ):
                self.auth_service.check_account_resource(
                    request.identity.id,
                    account=audience.account,
                    permission=self.text_target_permission,
                    resource_id=audience.id,
                )
            case _:
                raise AudienceTargetNotSupportedError

        # Update secondary fans if the feature flag is on
        if (
            self.features.is_on_for_identity(
                feature_flag_name=AUDIENCE_SHOW_ADD_SECONDARY_FANS_TOGGLE,
                identity_id=request.identity.id,
            )
            and audience.filters
        ):
            audience.filters.set_include_secondary_fans(target=audience.target)

        return audience