"""Ranking endpoints – listings sorted by ELO."""

from fastapi import APIRouter, Depends
from sqlalchemy import text
from sqlalchemy.orm import Session

from app.config import settings
from app.database import get_db
from app.queries import LISTING_SELECT, row_to_listing
from app.schemas import RankingResponse

router = APIRouter()


@router.get("/rankings", response_model=list[RankingResponse])
def get_rankings(
    status: str | None = None,
    limit: int = 100,
    offset: int = 0,
    db: Session = Depends(get_db),
):
    """Return listings ranked by ELO rating (highest first).

    Only listings in the stable sample (elo.sample_listings) are shown.
    """
    query = LISTING_SELECT + f"""
        INNER JOIN {settings.ELO_SCHEMA}.sample_listings s
            ON l.global_id = s.global_id
    """
    params: dict = {"limit": limit, "offset": offset}

    if status and status != "all":
        query += " WHERE l.status = :status"
        params["status"] = status

    query += " ORDER BY elo_rating DESC, l.current_price DESC LIMIT :limit OFFSET :offset"
    result = db.execute(text(query), params)
    listings = [row_to_listing(row) for row in result]

    return [
        RankingResponse(rank=offset + i + 1, listing=listing)
        for i, listing in enumerate(listings)
    ]