"""Publish post use case."""

from uuid import UUID

from app.application.dtos.post import PostResponseDTO
from app.application.interfaces import TransactionManager
from app.domain.entities import Post
from app.domain.exceptions import ForbiddenException, NotFoundException
from app.domain.repositories import PostRepository


class PublishPostUseCase:
    """Use case for publishing/unpublishing 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 publish(self, post_id: UUID, current_user_id: str) -> PostResponseDTO:
        """Publish a post."""
        post = await self._post_repo.get_by_id(post_id)
        if not post:
            raise NotFoundException(f"Post with id '{post_id}' not found")

        if post.author_id != current_user_id:
            raise ForbiddenException("You can only publish your own posts")

        post.publish()
        await self._post_repo.update(post)
        await self._tx_manager.commit()

        return self._map_to_dto(post)

    async def unpublish(self, post_id: UUID, current_user_id: str) -> PostResponseDTO:
        """Unpublish a post."""
        post = await self._post_repo.get_by_id(post_id)
        if not post:
            raise NotFoundException(f"Post with id '{post_id}' not found")

        if post.author_id != current_user_id:
            raise ForbiddenException("You can only unpublish your own posts")

        post.unpublish()
        await self._post_repo.update(post)
        await self._tx_manager.commit()

        return self._map_to_dto(post)

    def _map_to_dto(self, post: Post) -> PostResponseDTO:
        """Map domain entity to response DTO."""
        return PostResponseDTO(
            id=post.id,
            title=post.title.value,
            content=post.content.value,
            slug=post.slug.value,
            author_id=post.author_id,
            published=post.published,
            tags=post.tags.copy(),
            created_at=post.created_at,
            updated_at=post.updated_at,
        )