From 2741f47ef7b87255203bc2f7f7b2b9140c70b8f0 Mon Sep 17 00:00:00 2001
From: Joris
Date: Thu, 1 Nov 2018 13:14:25 +0100
Subject: Implementing client side validation

---
 client/src/Component/Input.hs | 114 +++++++++++++++++++++++++++++-------------
 1 file changed, 78 insertions(+), 36 deletions(-)

(limited to 'client/src/Component/Input.hs')

diff --git a/client/src/Component/Input.hs b/client/src/Component/Input.hs
index 57018a6..67f97c0 100644
--- a/client/src/Component/Input.hs
+++ b/client/src/Component/Input.hs
@@ -5,59 +5,91 @@ module Component.Input
   , defaultInputIn
   ) where
 
-import qualified Data.Map         as M
-import           Data.Text        (Text)
-import qualified Data.Text        as T
-import           Reflex.Dom       (Dynamic, Event, MonadWidget, Reflex, (&),
-                                   (.~))
-import qualified Reflex.Dom       as R
-
-import           Component.Button (ButtonIn (..), ButtonOut (..))
-import qualified Component.Button as Button
+import qualified Data.Map               as M
+import qualified Data.Maybe             as Maybe
+import           Data.Text              (Text)
+import qualified Data.Text              as T
+import           Data.Time              (NominalDiffTime)
+import           Data.Validation        (Validation (Failure, Success))
+import qualified Data.Validation        as V
+import           Reflex.Dom             (Dynamic, Event, MonadWidget, Reflex,
+                                         (&), (.~))
+import qualified Reflex.Dom             as R
+
+import qualified Common.Util.Validation as ValidationUtil
+import           Component.Button       (ButtonIn (..), ButtonOut (..))
+import qualified Component.Button       as Button
 import qualified Icon
 
-data InputIn = InputIn
+data InputIn a = InputIn
   { _inputIn_hasResetButton :: Bool
   , _inputIn_label          :: Text
   , _inputIn_initialValue   :: Text
   , _inputIn_inputType      :: Text
+  , _inputIn_validation     :: Text -> Validation Text a
   }
 
-defaultInputIn :: InputIn
+defaultInputIn :: InputIn Text
 defaultInputIn = InputIn
   { _inputIn_hasResetButton = True
   , _inputIn_label          = ""
   , _inputIn_initialValue   = ""
   , _inputIn_inputType      = "text"
+  , _inputIn_validation     = V.Success
   }
 
-data InputOut t = InputOut
-  { _inputOut_value :: Dynamic t Text
+data InputOut t a = InputOut
+  { _inputOut_raw   :: Dynamic t Text
+  , _inputOut_value :: Dynamic t (Maybe (Validation Text a))
   , _inputOut_enter :: Event t ()
   }
 
 input
   :: forall t m a b. MonadWidget t m
-  => InputIn
-  -> Event t a -- reset
-  -> m (InputOut t)
-input inputIn reset =
-  R.divClass "textInput" $ do
-    rec
-      let resetValue = R.leftmost
-            [ fmap (const "") reset
-            , fmap (const "") resetClic
-            ]
-
-          attributes = R.ffor value (\v ->
-            if T.null v && _inputIn_inputType inputIn /= "date"
-              then M.empty
-              else M.singleton "class" "filled")
-
-          value =  R._textInput_value textInput
+  => InputIn a
+  -> Event t Text -- reset
+  -> Event t b    -- validate
+  -> m (InputOut t a)
+input inputIn reset validate = do
+  rec
+    let resetValue = R.leftmost
+          [ R.traceEvent "reset" reset
+          , fmap (const "") resetClic
+          ]
+
+        inputAttr = R.ffor value (\v ->
+          if T.null v && _inputIn_inputType inputIn /= "date"
+            then M.empty
+            else M.singleton "class" "filled")
+
+        value =  R._textInput_value textInput
+
+        containerAttr = R.ffor validatedValue (\v ->
+          M.singleton "class" $ T.intercalate " "
+            [ "textInput"
+            , if Maybe.fromMaybe False (ValidationUtil.isFailure <$> v) then "error" else ""
+            ])
+
+    -- Clear validation errors after reset
+    delayedReset <- R.delay (0.1 :: NominalDiffTime) reset
+
+    validatedValue <- R.holdDyn Nothing $ R.attachWith
+      (\v (clearValidation, validateEmpty) ->
+        if clearValidation
+           then Nothing
+           else Just (_inputIn_validation inputIn $ (if validateEmpty then "" else v)))
+      (R.current value)
+      (R.leftmost
+        [ const (False, True) <$> resetClic
+        , (\f -> (f, False)) <$> (R.updated . R._textInput_hasFocus $ textInput)
+        , const (False, False) <$> validate
+        , const (True, False) <$> R.traceEvent "delayedReset" delayedReset
+        ])
+
+    (textInput, resetClic) <- R.elDynAttr "div" containerAttr $ do
 
       textInput <- R.textInput $ R.def
-        & R.attributes .~ attributes
+        & R.attributes .~ inputAttr
         & R.setValue .~ resetValue
         & R.textInputConfig_initialValue .~ (_inputIn_initialValue inputIn)
         & R.textInputConfig_inputType .~ (_inputIn_inputType inputIn)
@@ -75,9 +107,19 @@ input inputIn reset =
           else
             return R.never
 
-    let enter = fmap (const ()) $ R.ffilter ((==) 13) . R._textInput_keypress $ textInput
+      R.divClass "errorMessage" $
+        R.dynText . fmap validationError $ validatedValue
+
+      return (textInput, resetClic)
+
+  let enter = fmap (const ()) $ R.ffilter ((==) 13) . R._textInput_keypress $ textInput
+
+  return $ InputOut
+    { _inputOut_raw = value
+    , _inputOut_value = validatedValue
+    , _inputOut_enter = enter
+    }
 
-    return $ InputOut
-      { _inputOut_value = value
-      , _inputOut_enter = enter
-      }
+validationError :: Maybe (Validation Text a) -> Text
+validationError (Just (Failure e)) = e
+validationError _                  = ""
-- 
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