from dataclasses import dataclass

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 fansifter_common.utils.uuid import uuid_string

from ows_text_campaigns.adapters.db.decorators import transactional
from ows_text_campaigns.campaigns.enums import ShorteningMethod
from ows_text_campaigns.campaigns.models import ShortenedUrl
from ows_text_campaigns.campaigns.services import CampaignService
from ows_text_campaigns.campaigns.types import UrlPathLike
from ows_text_campaigns.campaigns.validators import ShortenedUrlValidator


@dataclass(kw_only=True)
class ValidateCampaignShortenedUrlRequest(AuthRequest):
    campaign_id: str
    shortened_url_id: str | None
    url: str
    method: ShorteningMethod
    domain: str
    path: UrlPathLike


@singleton
class ValidateCampaignShortenedUrlHandler:
    permission = Permission("text_campaign", "edit")

    def __init__(
        self,
        auth_service: AuthService,
        campaign_service: CampaignService,
        shortened_url_validator: ShortenedUrlValidator,
    ) -> None:
        self.auth_service = auth_service
        self.campaign_service = campaign_service
        self.shortened_url_validator = shortened_url_validator

    @transactional
    def handle(self, request: ValidateCampaignShortenedUrlRequest) -> ShortenedUrl:
        campaign = self.campaign_service.get_campaign(request.campaign_id)

        self.auth_service.check_account_resource(
            request.identity_id,
            account=campaign.account,
            permission=self.permission,
            resource_id=campaign.id,
        )

        # Validate allowed url domain
        url_domain = self.shortened_url_validator.validate_allowed_domain(
            identity_id=request.identity_id,
            account=campaign.account,
            domain=request.domain,
        )

        shortened_urls_by_id: dict[str, ShortenedUrl] = {
            shortened_url.id: shortened_url for shortened_url in campaign.shortened_urls
        }

        # Validate path is available for shortening
        if request.shortened_url_id:
            existing_shortened_url = shortened_urls_by_id.get(request.shortened_url_id)
        else:
            existing_shortened_url = None
        if (
            existing_shortened_url is None
            or existing_shortened_url.path != request.path
        ) and request.method == ShorteningMethod.STANDARD:
            self.shortened_url_validator.validate_availability(
                method=request.method,
                path=request.path,
            )

        return ShortenedUrl(
            id=request.shortened_url_id or uuid_string(),
            url=request.url,
            method=request.method,
            domain=url_domain.domain,
            path=request.path,
        )