"""Password hashing utilities using passlib."""

import re

from passlib.context import CryptContext

# Create password context for hashing and verification
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def hash_password(password: str) -> str:
    """
    Hash a password using bcrypt.

    Args:
        password: Plain text password

    Returns:
        Hashed password string
    """
    return pwd_context.hash(password)


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """
    Verify a plain password against a hashed password.

    Args:
        plain_password: Plain text password to verify
        hashed_password: Hashed password from database

    Returns:
        True if password matches, False otherwise
    """
    return pwd_context.verify(plain_password, hashed_password)


def validate_password_strength(password: str) -> tuple[bool, str]:
    """
    Validate password meets complexity requirements.

    Requirements:
    - At least 8 characters
    - At least 1 uppercase letter
    - At least 1 lowercase letter
    - At least 1 number

    Args:
        password: Plain text password to validate

    Returns:
        Tuple of (is_valid, error_message)
    """
    if len(password) < 8:
        return False, "Password must be at least 8 characters long"

    if not re.search(r"[A-Z]", password):
        return False, "Password must contain at least one uppercase letter"

    if not re.search(r"[a-z]", password):
        return False, "Password must contain at least one lowercase letter"

    if not re.search(r"\d", password):
        return False, "Password must contain at least one number"

    return True, ""