"""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()

SAMPLE_JOIN = (
    f" inner join {settings.ELO_SCHEMA}.sample_listings as s"
    f" on l.global_id = s.global_id"
)


@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)."""
    query = LISTING_SELECT + SAMPLE_JOIN
    params: dict = {"limit": limit, "offset": offset, "default_elo": settings.DEFAULT_ELO}

    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)
    ]