# from fastapi import Depends, HTTPException, status
# from jose import JWTError, jwt
# from datetime import datetime, timedelta
# from typing import Optional
# from fastapi.security import OAuth2PasswordBearer
# from passlib.context import CryptContext

# # For demo purposes, using simple keys
# SECRET_KEY = "hbjwdcgvcdjsavbcjkv"
# ALGORITHM = "HS256"
# ACCESS_TOKEN_EXPIRE_MINUTES = 30

# pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
# oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

# def verify_password(plain_password, hashed_password):
#     return pwd_context.verify(plain_password, hashed_password)

# def get_password_hash(password):
#     return pwd_context.hash(password)

# def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
#     to_encode = data.copy()
#     expire = datetime.utcnow() + (expires_delta or timedelta(minutes=15))
#     to_encode.update({"exp": expire})
#     return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)

# async def get_current_user(token: str = Depends(oauth2_scheme)):
#     try:
#         payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
#         user_id: str = payload.get("sub")
#         if not user_id:
#             raise HTTPException(status_code=401, detail="Invalid token")
#         return user_id
#     except JWTError:
#         raise HTTPException(status_code=401, detail="Invalid token")


from fastapi import Depends, HTTPException, status
from jose import JWTError, jwt
from datetime import datetime, timedelta
from typing import Optional
from fastapi.security import OAuth2PasswordBearer
from passlib.context import CryptContext

# ⚠️ move to env vars in prod
SECRET_KEY = "hbjwdcgvcdjsavbcjkv"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30

pwd_context = CryptContext(
    schemes=["argon2"],
    deprecated="auto"
)

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

def get_password_hash(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,
    expires_delta: Optional[timedelta] = None
):
    to_encode = data.copy()
    expire = datetime.utcnow() + (
        expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    )
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)

async def get_current_user(token: str = Depends(oauth2_scheme)):
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        user_id: str | None = payload.get("sub")
        if user_id is None:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail="Invalid token",
            )
        return user_id
    except JWTError:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token",
        )