import firebase_admin
from firebase_admin import credentials, firestore
import os
import json

db = None

def init_db():
    global db
    if not firebase_admin._apps:
        config = os.getenv("FIREBASE_CONFIG")
        json_path = "serviceAccountKey.json"

        try:
            if config:
                cred = credentials.Certificate(json.loads(config))
                firebase_admin.initialize_app(cred)
                db = firestore.client()
            elif os.path.exists(json_path):
                cred = credentials.Certificate(json_path)
                firebase_admin.initialize_app(cred)
                db = firestore.client()
        except Exception as e:
            print(f"DB Error: {e}")
    else:
        db = firestore.client()

init_db()