#!/usr/bin/env python3
import json
import subprocess
import sys
from pathlib import Path
from concurrent.futures import ThreadPoolExecutor, as_completed

# — CONFIG —
# files per batch
BATCH_SIZE = 200
# number of parallel git lfs processes
WORKERS = 8
# — /CONFIG —

def chunk_list(lst, size):
    """Yield successive `size`-sized chunks from lst."""
    for i in range(0, len(lst), size):
        yield lst[i:i+size]

def pull_batch(batch, batch_idx):
    """Run one `git lfs pull --include=…` for this batch."""
    include_arg = ",".join(batch)
    cmd = ["git", "lfs", "pull", "--include", include_arg]
    try:
        subprocess.run(cmd, check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
        return batch_idx, True, None
    except subprocess.CalledProcessError as e:
        return batch_idx, False, e.stderr

def main(jsonl_path: Path):
    # 1) load and dedupe file_name entries
    file_names = set()
    with jsonl_path.open(encoding="utf-8") as f:
        for line in f:
            try:
                rec = json.loads(line)
                fn = rec.get("file_name")
                if fn:
                    file_names.add(fn)
            except json.JSONDecodeError:
                continue

    if not file_names:
        print("No file_name fields found.", file=sys.stderr)
        sys.exit(1)

    sorted_files = sorted(file_names)
    batches = list(chunk_list(sorted_files, BATCH_SIZE))
    total = len(batches)

    # 2) run them in parallel
    print(f"▶️  Pulling {len(sorted_files)} files in {total} batches, {WORKERS} at a time…\n")
    with ThreadPoolExecutor(max_workers=WORKERS) as executor:
        futures = {
            executor.submit(pull_batch, batch, idx): idx
            for idx, batch in enumerate(batches, start=1)
        }

        for fut in as_completed(futures):
            idx, success, err = fut.result()
            if success:
                print(f"[{idx}/{total}] ✅")
            else:
                print(f"[{idx}/{total}] ❌ error:\n{err}", file=sys.stderr)

    print("\nAll done.")

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print(f"Usage: {sys.argv[0]} path/to/your.jsonl", file=sys.stderr)
        sys.exit(1)

    path = Path(sys.argv[1])
    if not path.is_file():
        print(f"File not found: {path}", file=sys.stderr)
        sys.exit(1)

    main(path)