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 FansSegmentValue
from dmp.artists.requests import ArtistFanReportFilterRequest
from dmp.artists.services import ArtistAccessService
from dmp.fandata.enums import FanSegment


@dataclass
class GetArtistFansCountBySegmentRequest(ArtistFanReportFilterRequest):
    countries: list[str] | None = None


FanSegmentValueListValidator = TypeAdapter(list[FansSegmentValue])


@singleton
class GetArtistFansCountBySegmentHandler:
    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: GetArtistFansCountBySegmentRequest
    ) -> list[FansSegmentValue]:
        artist_access = self.artist_access_service.check_artist_access(
            request.identity_id,
            request.global_participant_id,
            request.account,
            permission=self.permission,
        )

        segments = self._get_segments(
            request.global_participant_id,
            vendor_id=request.vendor_id,
            subaccount_id=request.subaccount_id,
            countries=request.countries,
            identity_id=request.identity_id,
            is_global=artist_access.is_global,
        )

        if max(segment.value for segment in segments) == 0:
            return []
        return segments

    @cached_artist_data("segments")
    def _get_segments(
        self,
        global_participant_id: str,
        vendor_id: int | None,
        subaccount_id: int | None,
        countries: list[str] | None,
        identity_id: str,
        is_global: bool,
    ) -> list[FansSegmentValue]:
        template_name = self._select_query_template_name(countries)
        query = self.db.query_from_template(
            template_name,
            context={
                "vendor_id": vendor_id,
                "subaccount_id": subaccount_id,
                "global_participant_id": global_participant_id,
                "fan_segment_enum": FanSegment,
                "identity_id": identity_id,
                "countries": countries,
                "is_global": is_global,
            },
        )
        return FanSegmentValueListValidator.validate_python(
            self.db.session.execute(query).mappings()
        )

    @staticmethod
    def _select_query_template_name(countries: list[str] | None) -> str:
        if countries:
            return "artist/get-artist-fans-count-by-segment-country.sql"
        return "artist/get-artist-fans-count-by-segment.sql"