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

from backend.database import get_db
from backend.services import author_service

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


@router.get("")
async def list_authors(
    subreddit_id: int | None = None,
    sort_by: str = Query("total_comments", pattern="^(total_posts|total_comments)$"),
    sort_order: str = Query("desc", pattern="^(asc|desc)$"),
    since: datetime | None = None,
    until: datetime | None = None,
    page: int = Query(1, ge=1),
    per_page: int = Query(25, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
):
    authors, total = await author_service.list_authors(
        db, subreddit_id, sort_by, sort_order, since, until, page, per_page
    )
    return {
        "data": authors,
        "total": total,
        "page": page,
        "per_page": per_page,
        "pages": (total + per_page - 1) // per_page if per_page else 0,
    }


@router.get("/{author_id}")
async def get_author(author_id: int, db: AsyncSession = Depends(get_db)):
    author = await author_service.get_author(db, author_id)
    if not author:
        raise HTTPException(status_code=404, detail="Author not found")
    return author