#!/usr/bin/env python3
"""Report the number of .mp4 files per folder in a JSON map."""
from __future__ import annotations
import argparse
import json
from pathlib import Path


def main() -> None:
    p = argparse.ArgumentParser(description=__doc__)
    p.add_argument(
        "input",
        type=Path,
        nargs="?",
        default=Path(__file__).resolve().parent / "mp4_by_folder.json",
        help="Input JSON path (default: mp4_by_folder.json next to this script)",
    )
    args = p.parse_args()

    data: dict[str, list[str]] = json.loads(args.input.read_text(encoding="utf-8"))

    total = 0
    max_name_len = max(len(k) for k in data)
    print(f"\n{'Category':<{max_name_len}}  Count")
    print("-" * (max_name_len + 8))
    for folder, files in sorted(data.items()):
        print(f"{folder:<{max_name_len}}  {len(files):>5}")
        total += len(files)
    print("-" * (max_name_len + 8))
    print(f"{'TOTAL':<{max_name_len}}  {total:>5}\n")


if __name__ == "__main__":
    main()