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#!/usr/bin/env python3
from __future__ import annotations

import argparse
import json
from pathlib import Path

import pandas as pd

def iter_jsonl(path: Path):
    with path.open("r", encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            yield json.loads(line)

def main() -> int:
    ap = argparse.ArgumentParser(description="JSONL → Parquet shards (Within Us AI)")
    ap.add_argument("--jsonl", required=True)
    ap.add_argument("--out_dir", required=True)
    ap.add_argument("--rows_per_shard", type=int, default=5000)
    args = ap.parse_args()

    src = Path(args.jsonl)
    out_dir = Path(args.out_dir)
    out_dir.mkdir(parents=True, exist_ok=True)

    buf = []
    shard = 0
    for obj in iter_jsonl(src):
        buf.append(obj)
        if len(buf) >= args.rows_per_shard:
            df = pd.DataFrame(buf)
            out = out_dir / f"{src.stem}-{shard:05d}.parquet"
            df.to_parquet(out, index=False)
            buf.clear()
            shard += 1

    if buf:
        df = pd.DataFrame(buf)
        out = out_dir / f"{src.stem}-{shard:05d}.parquet"
        df.to_parquet(out, index=False)

    print(f"Wrote shards to: {out_dir}")
    return 0

if __name__ == "__main__":
    raise SystemExit(main())