import json
import shutil
import os
import argparse

def main(args):
    with open(args.json) as f:
        clips = json.load(f)

    if isinstance(clips, dict):
        clips = [clips]

    for clip in clips:
        clip_id = clip["clip_id"]
        split = clip["split"]
        folder = clip["source_video_folder"]
        out_dir = os.path.join(args.dst, split, clip_id)
        os.makedirs(out_dir, exist_ok=True)

        for frame in clip["frames"]:
            src = os.path.join(args.src, folder, frame["source_frame"])
            dst = os.path.join(out_dir, frame["new_frame"])
            shutil.copy2(src, dst)
            print(f"Copied {src} -> {dst}")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Map old clip/frame names to new ones and copy files.")
    parser.add_argument("--json", default="./OLiVES_VOS_metadata.json", help="Path to the clips JSON file")
    parser.add_argument("--src", default="./OLiVES/input", help="Path to the low-light videos directory")
    args = parser.parse_args()

    main(args)