import re
import subprocess
import sys
from pathlib import Path

DATUM_IZPISKA = re.compile(r"Datum izpiska\s+(\d{2})\.(\d{2})\.(\d{4})")
# raneme nlb-izpisek based on datum izpiska 

def pdf_to_text(pdf_path):
    result = subprocess.run(
        ["pdftotext", "-layout", str(pdf_path), "-"],
        capture_output=True, text=True, check=True,
    )
    return result.stdout


def find_date(text):
    match = DATUM_IZPISKA.search(text)
    if not match:
        return None
    day, month, year = match.groups()
    return f"{year}-{month}-{day}"


def unique_target(dir_path, stem, suffix, current_path):
    target = dir_path / f"{stem}{suffix}"
    n = 2
    while target.exists() and target != current_path:
        target = dir_path / f"{stem}_{n}{suffix}"
        n += 1
    return target


def main():
    pdf_dir = Path(sys.argv[1])

    for pdf_path in sorted(pdf_dir.glob("*.pdf")):
        text = pdf_to_text(pdf_path)
        date = find_date(text)
        if not date:
            print(f"skip {pdf_path.name}: no 'Datum izpiska' found")
            continue

        target = unique_target(pdf_dir, f"izpisek_{date}", pdf_path.suffix, pdf_path)
        if target == pdf_path:
            continue
        pdf_path.rename(target)
        print(f"{pdf_path.name} -> {target.name}")


if __name__ == "__main__":
    main()