feat: end-point for deal document generation

services/billing.py

@@ -11,7 +11,7 @@ from starlette import status
 from weasyprint import HTML
 
 import backend.config
-from constants import MONTHS
+from constants import MONTHS, ENV
 from external.billing import BillingClient, CreateBillingRequestValue, CreateBillRequestSchema, CreateBillRequestItems, \
     BillStatusUpdateRequest, NotificationChannel, NotifyReceivedBillRequestSchema, DeleteBillRequestSchema
 from models import DealBillRequest, Deal, DealProduct, DealService as DealServiceModel
@@ -20,8 +20,6 @@ from services.base import BaseService
 from services.deal import DealService
 from utils.list_utils import to_locale_number
 
-env = Environment(loader=FileSystemLoader(Path("templates") / Path("documents")))
-
 
 class BillingService(BaseService):
     async def _process_update_details(
@@ -182,7 +180,7 @@ class BillingService(BaseService):
         deal_price = sum((service.price * service.amount for service in services))
         deal_price_words = get_string_by_number(deal_price)[0:-10]
         deal_price = to_locale_number(deal_price)
-        template = env.get_template("bill-of-payment.html")
+        template = ENV.get_template("bill-of-payment.html")
 
         now = datetime.datetime.now()
         curr_date = f"{now.day} {MONTHS[now.month - 1]} {now.year} г."