"""Delete post use case."""

from uuid import UUID

from app.application.interfaces import TransactionManager
from app.domain.exceptions import ForbiddenException, NotFoundException
from app.domain.repositories import PostRepository


class DeletePostUseCase:
    """Use case for deleting a blog post."""

    def __init__(
        self,
        post_repo: PostRepository,
        tx_manager: TransactionManager,
    ) -> None:
        self._post_repo = post_repo
        self._tx_manager = tx_manager

    async def execute(self, post_id: UUID, current_user_id: str) -> None:
        """Execute the use case."""
        post = await self._post_repo.get_by_id(post_id)
        if not post:
            raise NotFoundException(f"Post with id '{post_id}' not found")

        # Check authorization
        if post.author_id != current_user_id:
            raise ForbiddenException("You can only delete your own posts")

        # Delete the post
        await self._post_repo.delete(post_id)

        # Commit transaction
        await self._tx_manager.commit()