from datetime import datetime, timedelta
from typing import Optional, Union
from jose import JWTError, jwt
from passlib.context import CryptContext
from fastapi import HTTPException, status
from ..config.settings import settings

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

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 get_password_hash(password: str) -> str:
    """Hash a password"""
    return pwd_context.hash(password)

def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """Create a JWT access token"""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.jwt_expire_minutes)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
    return encoded_jwt

def verify_token(token: str) -> dict:
    """Verify and decode a JWT token"""
    try:
        payload = jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
        return payload
    except JWTError:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Could not validate credentials",
            headers={"WWW-Authenticate": "Bearer"},
        )