from dataclasses import dataclass
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 email_campaigns.reporting.models import EmailReportingReport
from email_campaigns.reporting.repositories import EmailReportingReportRepository


@dataclass(kw_only=True)
class ListEmailReportingReportsRequest(AuthRequest):
    DEFAULT_LIMIT: ClassVar[int] = 50
    DEFAULT_OFFSET: ClassVar[int] = 0

    name: str | None
    limit: int
    offset: int


@dataclass
class ListEmailReportingReportsResponse:
    total: int
    items: list[EmailReportingReport]


@singleton
class ListEmailReportingReportsHandler:
    permission: ClassVar[Permission] = Permission("email_campaign", "view")

    def __init__(
        self,
        auth_service: AuthService,
        report_repository: EmailReportingReportRepository,
    ) -> None:
        self.auth_service = auth_service
        self.report_repository = report_repository

    def handle(
        self, request: ListEmailReportingReportsRequest
    ) -> ListEmailReportingReportsResponse:
        self.auth_service.authorize_for_permission(
            request.identity_id, permission=self.permission
        )

        total = self.report_repository.count_by_identity_id(
            identity_id=request.identity_id,
            name=request.name,
        )
        if total == 0:
            return ListEmailReportingReportsResponse(total=0, items=[])

        items = self.report_repository.find_by_identity_id(
            identity_id=request.identity_id,
            name=request.name,
            limit=request.limit,
            offset=request.offset,
        )
        return ListEmailReportingReportsResponse(total=total, items=items)