from fastapi import APIRouter, Depends, HTTPException, Query, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth.deps import get_current_user
from app.database import get_db
from app.models.user import User
from app.schemas.post import PostCreate, PostUpdate, PostResponse, PaginatedPostsResponse
from app.services import posts as post_service

router = APIRouter(prefix="/posts", tags=["Posts"])


@router.get("", response_model=PaginatedPostsResponse)
async def list_posts(
    page: int = Query(default=1, ge=1),
    per_page: int = Query(default=10, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
):
    """List published posts with pagination."""
    return await post_service.get_published_posts(db, page=page, per_page=per_page)


@router.get("/{slug}", response_model=PostResponse)
async def get_post(slug: str, db: AsyncSession = Depends(get_db)):
    """Get a single published post by slug."""
    post = await post_service.get_post_by_slug(db, slug, published_only=True)
    if post is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=f"Post '{slug}' not found")
    return PostResponse.model_validate(post)


@router.post("", response_model=PostResponse, status_code=status.HTTP_201_CREATED)
async def create_post(
    data: PostCreate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Create a new blog post (auth required)."""
    post = await post_service.create_post(db, data)
    return PostResponse.model_validate(post)


@router.put("/{slug}", response_model=PostResponse)
async def update_post(
    slug: str,
    data: PostUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Update a post by slug (auth required)."""
    post = await post_service.update_post(db, slug, data)
    if post is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=f"Post '{slug}' not found")
    return PostResponse.model_validate(post)


@router.delete("/{slug}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_post(
    slug: str,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Delete a post by slug (auth required)."""
    deleted = await post_service.delete_post(db, slug)
    if not deleted:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=f"Post '{slug}' not found")