import decimal
from dataclasses import dataclass
from typing import Any

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 FansShareByHeavyRotation
from dmp.artists.requests import ArtistFanReportFilterRequest
from dmp.artists.services import ArtistAccessService
from dmp.fandata.enums import HeavyRotation


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


@dataclass
class GetArtistFansShareByHeavyRotationResponse:
    available_fans_share: decimal.Decimal
    items: list[FansShareByHeavyRotation]


HeavyRotationsFansShareListValidator = TypeAdapter(list[FansShareByHeavyRotation])


@singleton
class GetArtistFansShareByHeavyRotationHandler:
    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: GetArtistFansShareByHeavyRotationRequest
    ) -> GetArtistFansShareByHeavyRotationResponse:
        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,
            countries=request.countries,
            is_global=artist_access.is_global,
        )
        heavy_rotations = self._get_heavy_rotations(
            request.global_participant_id,
            vendor_id=request.vendor_id,
            subaccount_id=request.subaccount_id,
            countries=request.countries,
            is_global=artist_access.is_global,
        )

        return GetArtistFansShareByHeavyRotationResponse(
            available_fans_share=available_fans_share,
            items=heavy_rotations,
        )

    @cached_artist_data("heavy-rotation-available-fans-share")
    def _get_available_fans_share(
        self,
        global_participant_id: str,
        vendor_id: int | None,
        subaccount_id: int | None,
        countries: list[str] | None,
        is_global: bool,
    ) -> decimal.Decimal:
        context = self._get_query_context(
            vendor_id=vendor_id,
            subaccount_id=subaccount_id,
            global_participant_id=global_participant_id,
            countries=countries,
            is_global=is_global,
        )
        if countries:
            template_name = (
                "artist/get-artist-heavy-rotation-available-fans-share-by-country.sql"
            )
        else:
            template_name = "artist/get-artist-heavy-rotation-available-fans-share.sql"
        query = self.db.query_from_template(template_name, context=context)
        return decimal.Decimal(self.db.session.execute(query).scalar_one_or_none() or 0)

    @cached_artist_data("fans-share-by-heavy-rotation")
    def _get_heavy_rotations(
        self,
        global_participant_id: str,
        vendor_id: int | None,
        subaccount_id: int | None,
        countries: list[str] | None,
        is_global: bool,
    ) -> list[FansShareByHeavyRotation]:
        context = self._get_query_context(
            vendor_id=vendor_id,
            subaccount_id=subaccount_id,
            global_participant_id=global_participant_id,
            countries=countries,
            is_global=is_global,
        )
        if countries:
            template_name = "artist/get-artist-fans-share-by-heavy-rotation-country.sql"
        else:
            template_name = "artist/get-artist-fans-share-by-heavy-rotation.sql"
        query = self.db.query_from_template(template_name, context=context)
        return HeavyRotationsFansShareListValidator.validate_python(
            self.db.session.execute(query).mappings()
        )

    @staticmethod
    def _get_query_context(
        vendor_id: int | None,
        subaccount_id: int | None,
        global_participant_id: str,
        countries: list[str] | None,
        is_global: bool,
    ) -> dict[str, Any]:
        return {
            "vendor_id": vendor_id,
            "subaccount_id": subaccount_id,
            "global_participant_id": global_participant_id,
            "heavy_rotation_enum": HeavyRotation,
            "countries": countries,
            "is_global": is_global,
        }