import os
import json
from slack_sdk import WebClient
from slack_sdk.errors import SlackApiError

def get_user_id_to_name_mapping(token):
    client = WebClient(token=token)
    try:
        response = client.users_list()
        users = response['members']
        user_id_to_name = {user['id']: user['name'] for user in users}
        return user_id_to_name
    except SlackApiError as e:
        print(f"Error fetching user list: {e}")
        return {}

def save_mapping_to_json(mapping, filepath):
    with open(filepath, 'w') as file:
        json.dump(mapping, file)

def load_mapping_from_json(filepath):
    if not os.path.exists(filepath):
        return {}
    with open(filepath, 'r') as file:
        return json.load(file)

if __name__ == "__main__":
    # Replace 'YOUR_SLACK_API_TOKEN' with your actual Slack API token
    slack_token = os.environ.get('SLACK_API_TOKEN')

    # Fetch the user ID to name mapping from Slack
    user_id_to_name_mapping = get_user_id_to_name_mapping(slack_token)

    # Save the mapping to a JSON file
    save_mapping_to_json(user_id_to_name_mapping, 'user_id_to_name_mapping.json')

    # Load the mapping from the JSON file (just to demonstrate loading)
    loaded_mapping = load_mapping_from_json('user_id_to_name_mapping.json')
    print(loaded_mapping)