import argparse
import re
from pathlib import Path

def words(text):
    return set(re.findall(r"[a-z0-9]+", text.lower()))

def main():
    parser = argparse.ArgumentParser(description="Search notes with line citations")
    parser.add_argument("notes")
    parser.add_argument("question", nargs="+")
    args = parser.parse_args()
    file = Path(args.notes)
    try:
        lines = file.read_text(encoding="utf-8-sig").splitlines()
    except (OSError, UnicodeError):
        parser.exit(2, "Cannot read the notes as UTF-8 text.\n")
    query = words(" ".join(args.question))
    ranked = []
    for number, line in enumerate(lines, 1):
        tokens = words(line)
        score = len(query & tokens) / max(1, len(query | tokens))
        if score > 0:
            ranked.append((score, number, line))
    ranked.sort(key=lambda row: (-row[0], row[1]))
    if not ranked:
        print("No supporting passage found in these notes.")
    for score, number, line in ranked[:3]:
        print(f"[{file.name}:{number}] {line}")

if __name__ == "__main__":
    main()