from datetime import datetime, timedelta, timezone
from typing import Optional

import jwt
from passlib.context import CryptContext
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer

from typing import Any


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


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


def verify_password(password: str, hashed: str) -> bool:
    return pwd_context.verify(password, hashed)


def create_access_token(data: dict, secret: str, algorithm: str, expires_minutes: int) -> str:
    to_encode = data.copy()
    expire = datetime.now(timezone.utc) + timedelta(minutes=expires_minutes)
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, secret, algorithm=algorithm)


def decode_token(token: str, secret: str, algorithms: list[str]) -> dict:
    return jwt.decode(token, secret, algorithms=algorithms)


async def get_current_user_optional(token: Optional[str] = Depends(oauth2_scheme)):
    if not token:
        return None
    try:
        from app.utils.config import settings
        payload = decode_token(token, settings.JWT_SECRET, [settings.JWT_ALGORITHM])
        # supabase auth uses UUID subject if you later switch to Supabase JWTs
        return payload.get("sub")
    except Exception:
        return None


async def get_current_user(token: str = Depends(oauth2_scheme)):
    from app.utils.config import settings
    try:
        payload = decode_token(token, settings.JWT_SECRET, [settings.JWT_ALGORITHM])
        user_id = payload.get("sub")  # string UUID or int
        if user_id is None:
            raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Token invalide")
        return {"id": user_id}  # Minimal user placeholder until Supabase integration
    except jwt.ExpiredSignatureError:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Token expiré")
    except Exception:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Token invalide")