#!/usr/bin/env python3
"""
Run this first, before the GUI or batch tool exist.

It only reads your filesystem - it never renames or moves anything.
Point it at a real folder (start small, e.g. just 03_PRIVAT, not the
whole 711-file vault) and check:
  - does the file count look right (junk correctly excluded)?
  - does the date guess look reasonable as a STARTING point?
  - does the "already conventioned" count match what you'd expect?

Usage:
    python3 preview_scan.py /path/to/folder
"""

import sys
from pathlib import Path

from core import scan, discover_folders


def main():
    if len(sys.argv) != 2:
        print("Usage: python3 preview_scan.py /path/to/folder")
        sys.exit(1)

    root = Path(sys.argv[1]).expanduser().resolve()
    if not root.is_dir():
        print(f"Not a directory: {root}")
        sys.exit(1)

    records = scan(root)
    folders = discover_folders(root)

    already = sum(r.name_matches_convention for r in records)
    near = sum(r.near_miss for r in records)
    untouched = len(records) - already - near

    print(f"Scanned:                      {root}")
    print(f"Files found (junk excluded):  {len(records)}")
    print(f"  already conventioned:       {already}")
    print(f"  near-miss date format:      {near}")
    print(f"  untouched:                  {untouched}")
    print(f"Destination folders found:    {len(folders)}")
    print()
    print("First 20 files:")
    for r in records[:20]:
        flag = "OK " if r.name_matches_convention else ("~  " if r.near_miss else "   ")
        print(f"  [{flag}] {r.fs_date}  {r.rel_path}")

    if len(records) > 20:
        print(f"  ... and {len(records) - 20} more")


if __name__ == "__main__":
    main()