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from fastapi import HTTPException, UploadFile, File, Form
from typing import Optional
import bcrypt
from .database import db  # Assuming you have a database module for interacting with ChromaDB

# Admin Authentication
def verify_admin_password(submitted_password: str, stored_password_hash: str) -> bool:
    """
    Verifies the submitted password against the stored hash.
    
    :param submitted_password: The password submitted by the user.
    :param stored_password_hash: The hashed password retrieved from a secure store.
    :return: True if the password is correct, False otherwise.
    """
    return bcrypt.checkpw(submitted_password.encode('utf-8'), stored_password_hash.encode('utf-8'))

# User Registration
async def register_user(email: str, name: str, role: str, file: UploadFile = File(...)) -> Optional[str]:
    """
    Registers a new user with the provided details and stores the profile picture.
    
    :param email: The user's email address.
    :param name: The user's full name.
    :param role: The user's role (e.g., Student, Teacher).
    :param file: The profile picture file.
    :return: User ID of the newly registered user or None if registration failed.
    """
    # Here, you would include logic to:
    # 1. Process and validate the input data.
    # 2. Use MTCNN and Facenet (or similar) to process the profile picture.
    # 3. Store the user's details and the processed picture in ChromaDB.
    # 4. Return the user ID or None if the registration fails.
    
    # This is a placeholder for the implementation.
    pass

# Additional Admin Functions
# You could include other administrative functionalities here, such as:
# - Listing all registered users.
# - Moderating chat messages or viewing chat history.
# - Managing system settings or configurations.