import re
from utils.phone_utils import validate_indian_phone


def validate_password_strength(password: str) -> list[str]:
    errors = []
    if len(password) < 8:
        errors.append("Password must be at least 8 characters")
    if not re.search(r"[A-Z]", password):
        errors.append("Password must contain at least one uppercase letter")
    if not re.search(r"[a-z]", password):
        errors.append("Password must contain at least one lowercase letter")
    if not re.search(r"\d", password):
        errors.append("Password must contain at least one number")
    if not re.search(r"[!@#$%^&*(),.?\":{}|<>]", password):
        errors.append("Password must contain at least one special character")
    return errors


def validate_email_format(email: str) -> bool:
    return bool(re.match(r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$", email))


def validate_gst_number(gst: str) -> bool:
    if not gst:
        return True
    return bool(re.match(r"^\d{2}[A-Z]{5}\d{4}[A-Z]\d[Z][A-Z\d]$", gst))


def sanitize_input(text: str) -> str:
    if not text:
        return ""
    text = text.strip()
    text = re.sub(r"<[^>]+>", "", text)
    return text