#!/usr/bin/env python3
import asyncio
import json
import os
import webbrowser
from twitchAPI.twitch import Twitch
from twitchAPI.oauth import UserAuthenticator
from twitchAPI.type import AuthScope

SECRETS_FILE = "twitch_secrets.json"

def load_credentials():
    """Loads existing Client ID and Secret from your JSON file."""
    if not os.path.exists(SECRETS_FILE):
        raise FileNotFoundError(f"Could not find {SECRETS_FILE} in this directory.")
    with open(SECRETS_FILE, "r") as f:
        data = json.load(f)
    return data.get("client_id"), data.get("client_secret")

def save_token_to_json(token):
    """Saves the generated token into twitch_secrets.json under 'manual_token'."""
    with open(SECRETS_FILE, "r") as f:
        data = json.load(f)
    
    # Inject the new token
    data["manual_token"] = token
    
    with open(SECRETS_FILE, "w") as f:
        json.dump(data, f, indent=4)
    print(f"\n[SUCCESS] Token saved inside '{SECRETS_FILE}' under 'manual_token'!")

async def main():
    try:
        client_id, client_secret = load_credentials()
        if not client_id or not client_secret:
            print("[ERROR] Please add your client_id and client_secret to the JSON file first.")
            return

        print("Initializing local connection loop...")
        # Initialize official Twitch connection interface
        twitch = await Twitch(client_id, client_secret)
        
        # Scopes: We leave this empty [] since VOD collection only requires basic public clearance
        scopes = [] 
        
        # Create an authenticator that automatically sets up http://localhost:17563
        auth = UserAuthenticator(twitch, scopes, url="http://localhost:17563")
        
        # Request authentication URL
        auth_url = auth.return_auth_url()
        print(f"\nIf your browser does not open automatically, copy and paste this URL into your browser:\n{auth_url}\n")
        
        # Open your system default browser to let you manually click "Authorize"
        webbrowser.open(auth_url)
        
        print("Waiting for you to click 'Authorize' in your web browser...")
        # The script halts here, running a local background server until you click authorize
        token, refresh_token = await auth.authenticate()
        
        print(f"\nSuccessfully generated Token: {token}")
        
        # Save it right back into your configuration file
        save_token_to_json(token)
        
        # Gracefully shut down the library connection
        await twitch.close()

    except Exception as e:
        print(f"\n[ERROR] An error occurred: {e}")
        print("Double-check that http://localhost:17563 is added to your Twitch Dev Console.")

if __name__ == "__main__":
    # Run the asynchronous loop
    asyncio.run(main())