import decimal
from dataclasses import dataclass

from anydi import singleton
from fansifter_common.auth.types import Permission
from pydantic import TypeAdapter

from dmp.adapters.db import ReportingDB
from dmp.artists.cache import ArtistCache, cached_artist_data
from dmp.artists.dtos import FansShareByCountry
from dmp.artists.requests import ArtistFanReportFilterRequest
from dmp.artists.services import ArtistAccessService


@dataclass
class GetArtistFansShareByLocationRequest(ArtistFanReportFilterRequest):
    pass


@dataclass
class GetArtistFansShareByLocationResponse:
    available_fans_share: decimal.Decimal
    items: list[FansShareByCountry]


CountryFansShareListValidator = TypeAdapter(list[FansShareByCountry])


@singleton
class GetArtistFansShareByLocationHandler:
    permission = Permission("fan_data_list", "view")

    def __init__(
        self,
        db: ReportingDB,
        artist_access_service: ArtistAccessService,
        artist_cache: ArtistCache,
    ) -> None:
        self.db = db
        self.artist_access_service = artist_access_service
        self.artist_cache = artist_cache

    def handle(
        self, request: GetArtistFansShareByLocationRequest
    ) -> GetArtistFansShareByLocationResponse:
        artist_access = self.artist_access_service.check_artist_access(
            request.identity_id,
            request.global_participant_id,
            request.account,
            permission=self.permission,
        )
        available_fans_share = self._get_available_fans_share(
            request.global_participant_id,
            vendor_id=request.vendor_id,
            subaccount_id=request.subaccount_id,
            is_global=artist_access.is_global,
        )
        countries = self._get_countries(
            request.global_participant_id,
            vendor_id=request.vendor_id,
            subaccount_id=request.subaccount_id,
            is_global=artist_access.is_global,
        )
        return GetArtistFansShareByLocationResponse(
            available_fans_share=available_fans_share,
            items=countries,
        )

    @cached_artist_data("country-available-fans-share")
    def _get_available_fans_share(
        self,
        global_participant_id: str,
        vendor_id: int | None,
        subaccount_id: int | None,
        is_global: bool,
    ) -> decimal.Decimal:
        query = self.db.query_from_template(
            "artist/get-artist-country-available-fans-share.sql",
            context={
                "vendor_id": vendor_id,
                "subaccount_id": subaccount_id,
                "global_participant_id": global_participant_id,
                "is_global": is_global,
            },
        )
        return decimal.Decimal(self.db.session.execute(query).scalar_one_or_none() or 0)

    @cached_artist_data("fans-share-by-country")
    def _get_countries(
        self,
        global_participant_id: str,
        vendor_id: int | None,
        subaccount_id: int | None,
        is_global: bool,
    ) -> list[FansShareByCountry]:
        query = self.db.query_from_template(
            "artist/get-artist-fans-share-by-country.sql",
            context={
                "vendor_id": vendor_id,
                "subaccount_id": subaccount_id,
                "global_participant_id": global_participant_id,
                "is_global": is_global,
            },
        )
        result = self.db.session.execute(query).mappings()
        return CountryFansShareListValidator.validate_python(result)