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

from backend.database import get_db
from backend.services import comment_service

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


@router.get("")
async def list_comments(
    post_id: int | None = None,
    subreddit_id: int | None = None,
    author: str | None = None,
    sort_by: str = Query("created_utc", pattern="^(created_utc|score)$"),
    sort_order: str = Query("desc", pattern="^(asc|desc)$"),
    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),
):
    comments, total = await comment_service.list_comments(
        db, post_id, subreddit_id, author, sort_by, sort_order, since, until, page, per_page
    )
    return {
        "data": comments,
        "total": total,
        "page": page,
        "per_page": per_page,
        "pages": (total + per_page - 1) // per_page if per_page else 0,
    }