"""Read-only warehouse layer. Dashboard reads ONLY from data/warehouse/.
Cached with @st.cache_data. No imports from ML code.
"""

from pathlib import Path

import pandas as pd

ROOT = Path(__file__).resolve().parent.parent
WAREHOUSE = ROOT / "data" / "warehouse"


def _cache_key():
    """Bust cache when parquet files change."""
    files = sorted(WAREHOUSE.glob("*.parquet"))
    mtimes = tuple(f.stat().st_mtime for f in files)
    return (len(files), mtimes)


def load_players() -> pd.DataFrame:
    return pd.read_parquet(WAREHOUSE / "players.parquet")


def load_fixtures() -> pd.DataFrame:
    return pd.read_parquet(WAREHOUSE / "fixtures.parquet")


def load_predictions() -> pd.DataFrame:
    return pd.read_parquet(WAREHOUSE / "predictions.parquet")


def load_lineups() -> pd.DataFrame:
    return pd.read_parquet(WAREHOUSE / "lineups.parquet")


def load_votes() -> pd.DataFrame:
    return pd.read_parquet(WAREHOUSE / "votes.parquet")


def load_model_metrics() -> pd.DataFrame:
    return pd.read_parquet(WAREHOUSE / "model_metrics.parquet")