1 files changed, 143 insertions, 0 deletions
diff --git a/src/client/Model/Payment.elm b/src/client/Model/Payment.elm
new file mode 100644
index 0000000..f61ded8
--- /dev/null
+++ b/src/client/Model/Payment.elm
@@ -0,0 +1,143 @@
+module Model.Payment exposing
+  ( perPage
+  , Payments
+  , Payment
+  , PaymentId
+  , Frequency(..)
+  , paymentsDecoder
+  , paymentIdDecoder
+  , find
+  , edit
+  , delete
+  , totalPayments
+  , punctual
+  , monthly
+  , groupAndSortByMonth
+  , search
+  , validateFrequency
+  )
+
+import Date exposing (..)
+import Date.Extra.Core exposing (monthToInt, intToMonth)
+import Json.Decode as Decode exposing (Decoder)
+import Json.Decode.Extra as Decode
+import List
+
+import Form.Validate as Validate exposing (Validation)
+import Model.Date exposing (dateDecoder)
+import Model.User exposing (UserId, userIdDecoder)
+
+import Utils.List as List
+import Utils.Search as Search
+
+perPage : Int
+perPage = 7
+
+type alias Payments = List Payment
+
+type alias Payment =
+  { id : PaymentId
+  , name : String
+  , cost : Int
+  , date : Date
+  , userId : UserId
+  , frequency : Frequency
+  }
+
+type alias PaymentId = Int
+
+type Frequency = Punctual | Monthly
+
+paymentsDecoder : Decoder Payments
+paymentsDecoder = Decode.list paymentDecoder
+
+paymentDecoder : Decoder Payment
+paymentDecoder =
+  Decode.map6 Payment
+    (Decode.field "id" paymentIdDecoder)
+    (Decode.field "name" Decode.string)
+    (Decode.field "cost" Decode.int)
+    (Decode.field "date" dateDecoder)
+    (Decode.field "userId" userIdDecoder)
+    (Decode.field "frequency" frequencyDecoder)
+
+paymentIdDecoder : Decoder PaymentId
+paymentIdDecoder = Decode.int
+
+frequencyDecoder : Decoder Frequency
+frequencyDecoder =
+  let frequencyResult input =
+        case input of
+          "Punctual" -> Ok Punctual
+          "Monthly" -> Ok Monthly
+          _ -> Err ("Could not deduce Punctual nor Monthly from " ++ input)
+  in  Decode.string |> Decode.andThen (Decode.fromResult << frequencyResult)
+
+find : PaymentId -> Payments -> Maybe Payment
+find paymentId payments =
+  payments
+    |> List.filter (\p -> p.id == paymentId)
+    |> List.head
+
+edit : Payment -> Payments -> Payments
+edit payment payments = payment :: delete payment.id payments
+
+delete : PaymentId -> Payments -> Payments
+delete paymentId = List.filter (((/=) paymentId) << .id)
+
+totalPayments : (Payment -> Bool) -> UserId -> Payments -> Int
+totalPayments paymentFilter userId payments =
+  payments
+    |> List.filter (\payment ->
+         paymentFilter payment
+         && payment.userId == userId
+       )
+    |> List.map .cost
+    |> List.sum
+
+punctual : Payments -> Payments
+punctual = List.filter ((==) Punctual << .frequency)
+
+monthly : Payments -> Payments
+monthly = List.filter ((==) Monthly << .frequency)
+
+groupAndSortByMonth : Payments -> List ((Month, Int), Payments)
+groupAndSortByMonth payments =
+  payments
+    |> List.groupBy (\payment -> (Date.year payment.date, monthToInt << Date.month <| payment.date))
+    |> List.sortBy Tuple.first
+    |> List.map (\((year, month), payments) -> ((intToMonth month, year), payments))
+    |> List.reverse
+
+search : String -> Frequency -> Payments -> Payments
+search name frequency payments =
+  payments
+    |> List.filter ((==) frequency << .frequency)
+    |> paymentSort frequency
+    |> List.filter (searchSuccess name)
+
+paymentSort : Frequency -> Payments -> Payments
+paymentSort frequency =
+  case frequency of
+    Punctual -> List.reverse << List.sortBy (Date.toTime << .date)
+    Monthly -> List.sortBy (String.toLower << .name)
+
+searchSuccess : String -> Payment -> Bool
+searchSuccess search { name, cost } =
+  let searchSuccessWord word =
+        (  String.contains (Search.format word) (Search.format name)
+        || String.contains word (toString cost)
+        )
+  in  List.all searchSuccessWord (String.words search)
+
+validateFrequency : Validation String Frequency
+validateFrequency =
+  Validate.customValidation Validate.string (\str ->
+    if str == toString Punctual
+      then
+        Ok Punctual
+      else
+        if str == toString Monthly
+          then Ok Monthly
+          else Err (Validate.customError "InvalidFrequency")
+  )