from __future__ import annotations

from pathlib import Path

import pandas as pd


def read_table(path: str | Path) -> pd.DataFrame:
    source = Path(path)
    suffix = source.suffix.lower()
    if suffix in {".csv", ".txt", ".tsv"}:
        sep = "\t" if suffix in {".tsv", ".txt"} else ","
        return pd.read_csv(source, sep=sep)
    if suffix == ".parquet":
        return pd.read_parquet(source)
    raise ValueError(f"Unsupported table format: {source}")


def write_table(df: pd.DataFrame, path: str | Path) -> Path:
    target = Path(path)
    target.parent.mkdir(parents=True, exist_ok=True)
    suffix = target.suffix.lower()
    if suffix == ".csv":
        df.to_csv(target, index=False)
    elif suffix == ".parquet":
        df.to_parquet(target, index=False)
    else:
        raise ValueError(f"Unsupported output table format: {target}")
    return target