import os
from firebase_admin import credentials, initialize_app, firestore

# Load credentials
_creds = None
json_inline = os.environ.get("FIREBASE_SERVICE_ACCOUNT_JSON")
file_path = os.environ.get("GOOGLE_APPLICATION_CREDENTIALS")
if json_inline:
    _creds = credentials.Certificate(json.loads(json_inline))
elif file_path and os.path.exists(file_path):
    _creds = credentials.Certificate(file_path)
else:
    raise RuntimeError("Firebase credentials not configured. Set GOOGLE_APPLICATION_CREDENTIALS or FIREBASE_SERVICE_ACCOUNT_JSON.")

# Initialize Firebase Admin SDK
firebase_admin_app = initialize_app(_creds)

# Create Firestore client
db = firestore.client()