from passlib.context import CryptContext
from datetime import datetime, timedelta
from jose import jwt, JWTError
from dotenv import load_dotenv
import os

load_dotenv()

SECRET_KEY = os.getenv("SECRET_KEY", "fallback-secret-key-for-development-only")
ALGORITHM = os.getenv("ALGORITHM", "HS256")
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", 60))

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

def hash_password(password: str) -> str:
    return pwd_context.hash(password)

def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)

def create_access_token(data: dict):
    expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    data.update({"exp": expire})
    return jwt.encode(data, SECRET_KEY, algorithm=ALGORITHM)

def decode_access_token(token: str):
    try:
        return jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
    except JWTError:
        return None