From fb8f0fe577e28dae69903413b761da50586e0099 Mon Sep 17 00:00:00 2001
From: Joris
Date: Sat, 10 Aug 2019 14:53:41 +0200
Subject: Remove payment category if unused after a payment is deleted

---
 server/src/Controller/Payment.hs | 37 +++++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 14 deletions(-)

(limited to 'server/src/Controller/Payment.hs')

diff --git a/server/src/Controller/Payment.hs b/server/src/Controller/Payment.hs
index e82fd49..3d857be 100644
--- a/server/src/Controller/Payment.hs
+++ b/server/src/Controller/Payment.hs
@@ -1,18 +1,18 @@
 module Controller.Payment
   ( list
   , create
-  , editOwn
-  , deleteOwn
+  , edit
+  , delete
   ) where
 
 import           Control.Monad.IO.Class      (liftIO)
 import qualified Network.HTTP.Types.Status   as Status
-import           Web.Scotty
+import           Web.Scotty                  hiding (delete)
 
 import           Common.Model                (CreatePayment (..),
                                               CreatedPayment (..),
-                                              EditPayment (..), PaymentId,
-                                              User (..))
+                                              EditPayment (..), Payment (..),
+                                              PaymentId, User (..))
 import qualified Model.Query                 as Query
 import qualified Persistence.Payment         as PaymentPersistence
 import qualified Persistence.PaymentCategory as PaymentCategoryPersistence
@@ -41,11 +41,11 @@ create createPayment@(CreatePayment name cost date category frequency) =
           json validationError
   )
 
-editOwn :: EditPayment -> ActionM ()
-editOwn (EditPayment paymentId name cost date category frequency) =
+edit :: EditPayment -> ActionM ()
+edit (EditPayment paymentId name cost date category frequency) =
   Secure.loggedAction (\user -> do
     updated <- liftIO . Query.run $ do
-      edited <- PaymentPersistence.editOwn (_user_id user) paymentId name cost date frequency
+      edited <- PaymentPersistence.edit (_user_id user) paymentId name cost date frequency
       _ <- if edited
         then PaymentCategoryPersistence.save name category >> return ()
         else return ()
@@ -55,11 +55,20 @@ editOwn (EditPayment paymentId name cost date category frequency) =
       else status Status.badRequest400
   )
 
-deleteOwn :: PaymentId -> ActionM ()
-deleteOwn paymentId =
+delete :: PaymentId -> ActionM ()
+delete paymentId =
   Secure.loggedAction (\user -> do
-    deleted <- liftIO . Query.run $ PaymentPersistence.deleteOwn (_user_id user) paymentId
-    if deleted
-      then status Status.ok200
-      else status Status.badRequest400
+    deleted <- liftIO . Query.run $ do
+      payment <- PaymentPersistence.find paymentId
+      case payment of
+        Just p | _payment_user p == _user_id user -> do
+          PaymentPersistence.delete (_user_id user) paymentId
+          PaymentCategoryPersistence.deleteIfUnused (_payment_name p)
+          return True
+        _ ->
+          return False
+    if deleted then
+      status Status.ok200
+    else
+      status Status.badRequest400
   )
-- 
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