from dataclasses import dataclass

from email_campaigns.adapters.db import Repository
from email_campaigns.config import settings
from email_campaigns.emails.cache import EmailPublicPreviewCache
from email_campaigns.emails.exceptions import (
    AutosaveUnauthorizedError,
    EmailNotFoundError,
)
from email_campaigns.emails.models import BaseEmail


@dataclass(kw_only=True)
class AutosaveEmailRequest:
    key: str
    email_id: str
    html: str
    css: str
    username: str
    password: str
    user_id: str | None = None


class AutosaveEmailHandler[T: BaseEmail]:
    def __init__(
        self,
        email_repository: Repository[T],
        preview_cache: EmailPublicPreviewCache,
    ) -> None:
        self.email_repository = email_repository
        self.preview_cache = preview_cache

    def handle(self, request: AutosaveEmailRequest) -> None:
        if (
            settings.stripo_autosave_username != request.username
            or settings.stripo_autosave_password != request.password
        ):
            raise AutosaveUnauthorizedError

        email = self.email_repository.get(request.email_id)
        if email is None:
            raise EmailNotFoundError

        # Extra email validation
        self.validate_email(email)

        email.html_content = request.html
        email.css_content = request.css

        if request.user_id:
            email.updated_by = request.user_id

        self.email_repository.save(email)

        # Invalidate cache after autosave
        self.preview_cache.delete(email.id, email.email_type)

    def validate_email(self, email: T) -> None:
        """Extra email validation"""