1 files changed, 47 insertions, 0 deletions
diff --git a/src/client/Validation.elm b/src/client/Validation.elm
new file mode 100644
index 0000000..4781c3d
--- /dev/null
+++ b/src/client/Validation.elm
@@ -0,0 +1,47 @@
+module Validation exposing
+  ( cost
+  , date
+  , category
+  )
+
+import Date exposing (Date)
+import Date.Extra.Core exposing (intToMonth)
+import Date.Extra.Create exposing (dateFromFields)
+import Dict
+import String exposing (toInt, split)
+
+import Form.Validate as Validate exposing (Validation)
+
+import Model.Category exposing (Categories, CategoryId)
+
+cost : Validation String Int
+cost =
+  Validate.customValidation Validate.int (\n ->
+    if n == 0
+      then Err (Validate.customError "CostMustNotBeNull")
+      else Ok n
+  )
+
+date : Validation String Date
+date =
+  Validate.customValidation Validate.string (\str ->
+    case split "/" str of
+      [day, month, year] ->
+        case (toInt day, toInt month, toInt year) of
+          (Ok dayNum, Ok monthNum, Ok yearNum) ->
+            Ok (dateFromFields yearNum (intToMonth monthNum) dayNum 0 0 0 0)
+          _ -> Err (Validate.customError "InvalidDate")
+      _ -> Err (Validate.customError "InvalidDate")
+  )
+
+category : Categories -> Validation String CategoryId
+category categories =
+  Validate.customValidation Validate.string (\str ->
+    case toInt str of
+      Ok category ->
+        if List.member category (Dict.keys categories)
+          then Ok category
+          else Err (Validate.customError "InvalidCategory")
+      Err _ ->
+        Err (Validate.customError "InvalidCategory")
+  )