import os
import re

VCF_DIR = "vcf"
os.makedirs(VCF_DIR, exist_ok=True)


def _safe_name(name):
    # ponytail: keep filenames filesystem-safe; fall back to "contact"
    name = (name or "contact").strip().replace(" ", "_")
    return re.sub(r"[^A-Za-z0-9_.-]", "", name) or "contact"


def generate_vcf(data):
    filename = os.path.join(VCF_DIR, f"{_safe_name(data.get('name'))}.vcf")

    card = f"""BEGIN:VCARD
VERSION:3.0
FN:{data.get('name', '')}
ORG:{data.get('company', '')}
TITLE:{data.get('designation', '')}
TEL:{data.get('phone', '')}
EMAIL:{data.get('email', '')}
URL:{data.get('website', '')}
ADR:{data.get('address', '')}
END:VCARD
"""
    with open(filename, "w") as f:
        f.write(card)

    return filename


if __name__ == "__main__":
    # ponytail: one runnable check — the filename-safety path is the only real logic
    sample = {"name": "John Doe / CEO", "email": "j@abc.com"}
    path = generate_vcf(sample)
    assert os.path.basename(path) == "John_Doe__CEO.vcf", path
    assert "FN:John Doe / CEO" in open(path).read()
    assert _safe_name("") == "contact"
    assert _safe_name("../etc/passwd") == "..etcpasswd"
    print("ok", path)