from collections.abc import Sequence
from dataclasses import dataclass, field
from typing import ClassVar

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,
    AdReportingSummary,
)
from dmp.ad_reporting.enums import AdReportingObjective, AdReportingPlatform
from dmp.ad_reporting.repositories import AdReportingCampaignRepository
from dmp.ad_reporting.services import (
    AdReportingAccountService,
    AdReportingBenchmarkService,
)
from dmp.ad_reporting.types import AdReportingCampaignOrderBy


@dataclass(kw_only=True)
class GetAdReportingCampaignsRequest(AuthRequest):
    DEFAULT_LIMIT: ClassVar[int] = 25
    DEFAULT_OFFSET: ClassVar[int] = 0
    DEFAULT_ORDER_BY: ClassVar[list[AdReportingCampaignOrderBy]] = [
        "startAt.desc",
        "name.asc",
    ]

    search: str | None
    global_participant_id: str | None
    countries: list[str] | None = None
    platform: AdReportingPlatform | None
    objective: AdReportingObjective | None
    order_by: list[AdReportingCampaignOrderBy]
    limit: int
    offset: int
    report_id: str | None = None


@dataclass
class GetAdReportingCampaignsResponse:
    items: Sequence[AdReportingCampaign]
    summary: AdReportingSummary
    # deprecated
    total: int = field(init=False)

    def __post_init__(self) -> None:
        self.total = self.summary.total


@singleton
class GetAdReportingCampaignsHandler:
    access_permission = Permission(
        "ad_campaign", "view"
    )  # TODO: upd after ad report logic change
    permission = Permission("ad_campaign", "view")

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

    def handle(
        self, request: GetAdReportingCampaignsRequest
    ) -> GetAdReportingCampaignsResponse:
        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, platform=request.platform
        )

        if not ad_account_labels:
            return GetAdReportingCampaignsResponse(
                items=[], summary=AdReportingSummary()
            )

        criteria = AdReportingCampaignCriteria(
            search=request.search,
            global_participant_id=request.global_participant_id,
            platform=request.platform,
            objective=request.objective,
            account_ids=set(ad_account_labels.keys()),
            countries=request.countries,
            report_id=request.report_id,
        )

        summary = self.campaign_repository.summary_by_criteria(criteria)

        if summary.total == 0:
            return GetAdReportingCampaignsResponse(items=[], summary=summary)

        campaigns = self.campaign_repository.find_by_criteria(
            criteria,
            limit=request.limit,
            offset=request.offset,
            order_by=request.order_by,
        )

        # Prefetch label ad accounts
        for campaign in campaigns:
            campaign.accounts = ad_account_labels.get(campaign.account_id, set())

        if not request.countries or len(request.countries) <= 1:
            allowed_ad_account_labels = (
                self.account_service.get_allowed_ad_account_labels(
                    account_access=self.auth_service.authorize_for_permission(
                        request.identity_id, permission=self.access_permission
                    ),
                )
            )

            self.benchmark_service.prefetch_campaign_benchmarks(
                items=campaigns,
                allowed_ad_account_labels=allowed_ad_account_labels,
                countries=request.countries,
            )

        return GetAdReportingCampaignsResponse(
            items=campaigns,
            summary=summary,
        )