# The download codes are from: https://github.com/arbabenko/GNOIMI/blob/master/downloadDeep1B.py

import subprocess
from pathlib import Path
import argparse

def process_args():
    parser = argparse.ArgumentParser()
    parser.add_argument("--root", default="./deep1b", help="The path to the data directory")

def merge_batches(root, prefix, batch_n):
    """
    Helper function to merge batches into a single file
    Args:
        root: The path to the data directory.
        prefix: "base" or "learn"
        batch_n: The number of batches to be downloaded
    """
    cat = "cat "
    for n in range(batch_n):
        filename = "{}/{}_{}".format(prefix, prefix, str(n).zfill(2))  # e.g., base/base_00
        cat += " " + str(root / filename)
    cat += " > " + str(root / f"{prefix}.fvecs")  # e.g.: cat ./deep1b/base_00 ./deep1b/base_01 ... > ./deep1b/base.fvecs
    subprocess.run(cat, shell=True)


if __name__ == '__main__':
    args = process_args()
    root = Path(args.root)
    root.mkdir(exist_ok=True, parents=True)  # Create root directory if it doesn't exist
    ops = args.ops

    merge_batches(root, "base", 37)