Implement shopping cart

src/allmende_payment_system/api/__init__.py

@@ -11,7 +11,6 @@ templates = get_jinja_renderer()
 
 @root_router.get("/")
 async def landing_page(request: Request, user: UserDep, session: SessionDep):
-    print(f"User {user.username} ({user.display_name}) accessed landing page")
     transactions = []
     for account in user.accounts:
         transactions += account.transactions

src/allmende_payment_system/api/dependencies.py

@@ -13,6 +13,7 @@ def get_session() -> Session:
     try:
         yield db
     finally:
+        db.commit()
         db.close()
 
 

src/allmende_payment_system/api/shop.py

@@ -1,8 +1,12 @@
+from decimal import Decimal
+
 from fastapi import APIRouter, Request
 from sqlalchemy import select
+from starlette import status
+from starlette.responses import RedirectResponse
 
-from allmende_payment_system.api import SessionDep
-from allmende_payment_system.models import Area
+from allmende_payment_system.api.dependencies import SessionDep, UserDep
+from allmende_payment_system.models import Area, OrderItem, Product
 from allmende_payment_system.tools import get_jinja_renderer
 
 shop_router = APIRouter()
@@ -20,6 +24,26 @@ async def get_shop(request: Request, session: SessionDep):
     )
 
 
+@shop_router.get("/shop/cart")
+async def get_cart(request: Request, session: SessionDep, user: UserDep):
+
+    return templates.TemplateResponse(
+        "cart.html.jinja",
+        context={"request": request, "user": user},
+    )
+
+
+@shop_router.get("/shop/finalize_order")
+async def get_cart(request: Request, session: SessionDep, user: UserDep):
+
+    cart = user.shopping_cart
+
+    # TODO: Implement
+    cart.finalize_order()
+
+    return RedirectResponse(url=f"/", status_code=status.HTTP_302_FOUND)
+
+
 @shop_router.get("/shop/area/{area_id}")
 async def get_shop(request: Request, session: SessionDep, area_id: int):
     query = select(Area).where(Area.id == area_id)
@@ -28,3 +52,27 @@ async def get_shop(request: Request, session: SessionDep, area_id: int):
         "area.html.jinja",
         context={"request": request, "area": area},
     )
+
+
+@shop_router.post("/shop/cart/add")
+async def add_to_cart(request: Request, session: SessionDep, user: UserDep):
+    form_data = await request.form()
+
+    query = select(Product).where(Product.id == form_data["product_id"])
+    product = session.scalars(query).one()
+
+    quantity = Decimal(form_data["quantity"])
+    total_amount = product.price * quantity
+
+    order_item = OrderItem(
+        product=product, quantity=quantity, total_amount=total_amount
+    )
+    session.add(order_item)
+    cart = user.shopping_cart
+    cart.items.append(order_item)
+
+    session.flush()
+
+    return RedirectResponse(
+        url=f"/shop/area/{form_data['area_id']}", status_code=status.HTTP_302_FOUND
+    )