from passlib.context import CryptContext
from jose import JWTError, jwt
from datetime import datetime, timedelta
from typing import Optional
from app.config import settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

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

def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verify a password against its hash"""
    return pwd_context.verify(plain_password, hashed_password)

def create_access_token(user_id: int, email: str) -> str:
    """Create a JWT access token"""
    expires = datetime.utcnow() + timedelta(minutes=settings.jwt_expires_minutes)
    to_encode = {
        "sub": str(user_id),
        "email": email,
        "exp": expires,
    }
    encoded_jwt = jwt.encode(to_encode, settings.jwt_secret, algorithm="HS256")
    return encoded_jwt

def decode_access_token(token: str) -> Optional[dict]:
    """Decode and validate a JWT access token"""
    try:
        payload = jwt.decode(token, settings.jwt_secret, algorithms=["HS256"])
        return payload
    except JWTError:
        return None