import base64
import json
import os
import firebase_admin
from firebase_admin import db

from dotenv import load_dotenv

load_dotenv()

def decode_service_key():
    encoded_key = os.environ["FIREBASE_CREDENTIALS"]
    original_service_key = json.loads(base64.b64decode(encoded_key).decode('utf-8'))
    if original_service_key:
        return original_service_key
    return None


# Firebase initialization
def initialize_firebase():
    try:
        # Try to initialize Firebase app if not already initialized
        firebase_admin.get_app()
    except ValueError:
        creds_file_name = '.config/user-evaluations-firebase-creds.json'
        if not (os.path.exists(creds_file_name) and os.path.isdir(creds_file_name)):
            credentials = decode_service_key()
            with open(creds_file_name, 'w', encoding='utf-8') as file:
                json.dump(credentials, file, ensure_ascii=False, indent=4)
        # If not initialized, initialize the default app
        cred_obj = firebase_admin.credentials.Certificate(creds_file_name)
        database_URL = os.environ["FIREBASE_DATABASE_URL"]
        firebase_admin.initialize_app(cred_obj, {'databaseURL': database_URL})


def db_setup():
    try:
        initialize_firebase()
    except Exception as e:
        print(f"Error initializing Firebase: {e}")
    firebase_admin.get_app()
    ref = db.reference('/')
    return ref