Add multi account support to shpping cart

src/allmende_payment_system/api/shop.py

@@ -1,6 +1,7 @@
 from decimal import Decimal
+from typing import Annotated
 
-from fastapi import APIRouter, HTTPException, Request
+from fastapi import APIRouter, Form, HTTPException, Request
 from sqlalchemy import select
 from starlette import status
 from starlette.responses import RedirectResponse
@@ -29,17 +30,32 @@ async def get_cart(request: Request, session: SessionDep, user: UserDep):
 
     return templates.TemplateResponse(
         "order.html.jinja",
-        context={"request": request, "order": user.shopping_cart, "is_cart": True},
+        context={
+            "request": request,
+            "user": user,
+            "order": user.shopping_cart,
+            "is_cart": True,
+        },
     )
 
 
-@shop_router.get("/shop/finalize_order")
-async def finalize_order(request: Request, session: SessionDep, user: UserDep):
+@shop_router.post("/shop/finalize_order")
+async def finalize_order(
+    request: Request,
+    session: SessionDep,
+    user: UserDep,
+    account_id: Annotated[float, Form()],
+):
 
     cart = user.shopping_cart
 
-    # TODO: Implement
-    cart.finalize(user.accounts[0])
+    for account in user.accounts:
+        if account.id == account_id:
+            break
+    else:
+        raise HTTPException(status_code=400, detail="Invalid account ID.")
+
+    cart.finalize(account)
 
     return RedirectResponse(url=f"/", status_code=status.HTTP_302_FOUND)