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|
module ServerCommunication
( Communication(..)
, sendRequest
, serverCommunications
) where
import Signal
import Task as Task exposing (Task)
import Http
import Json.Decode exposing (..)
import Date
import Model.Message exposing (messageDecoder)
import Model.User exposing (UserId)
import Model.Payment exposing (PaymentId, perPage, paymentsDecoder)
import Update as U
import Update.SignIn exposing (..)
import Update.Payment as UP
type Communication =
NoCommunication
| SignIn String
| AddPayment UserId String Int
| DeletePayment PaymentId UserId Int Int
| UpdatePage Int
| SignOut
serverCommunications : Signal.Mailbox Communication
serverCommunications = Signal.mailbox NoCommunication
sendRequest : Communication -> Task Http.RawError U.Action
sendRequest communication =
case getRequest communication of
Nothing ->
Task.succeed U.NoOp
Just request ->
Http.send Http.defaultSettings request
|> flip Task.andThen (serverResult communication)
getRequest : Communication -> Maybe Http.Request
getRequest communication =
case communication of
NoCommunication ->
Nothing
SignIn login ->
Just (simple "post" ("/signIn?login=" ++ login))
AddPayment userId paymentName cost ->
Just (simple "post" ("/payment/add?name=" ++ paymentName ++ "&cost=" ++ (toString cost)))
DeletePayment paymentId _ _ _ ->
Just (simple "post" ("payment/delete?id=" ++ (toString paymentId)))
UpdatePage page ->
Just (updatePageRequest page)
SignOut ->
Just (simple "post" "/signOut")
updatePageRequest : Int -> Http.Request
updatePageRequest page =
simple "get" ("payments?page=" ++ toString page ++ "&perPage=" ++ toString perPage)
simple : String -> String -> Http.Request
simple method url =
{ verb = method
, headers = []
, url = url
, body = Http.empty
}
serverResult : Communication -> Http.Response -> Task Http.RawError U.Action
serverResult communication response =
if response.status == 200
then
case communication of
NoCommunication ->
Task.succeed U.NoOp
SignIn login ->
Task.succeed (U.UpdateSignIn (ValidLogin login))
AddPayment userId paymentName cost ->
Http.send Http.defaultSettings (updatePageRequest 1)
|> Task.map (\response ->
if response.status == 200
then
decodeResponse
response
paymentsDecoder
(\payments -> U.UpdatePayment (UP.AddPayment userId cost payments))
else
U.NoOp
)
DeletePayment id userId cost currentPage ->
Http.send Http.defaultSettings (updatePageRequest currentPage)
|> Task.map (\response ->
if response.status == 200
then
decodeResponse
response
paymentsDecoder
(\payments -> U.UpdatePayment (UP.Remove userId cost payments))
else
U.NoOp
)
UpdatePage page ->
decodeResponse
response
paymentsDecoder
(\payments -> U.UpdatePayment (UP.UpdatePage page payments))
|> Task.succeed
SignOut ->
Task.succeed (U.GoSignInView)
else
decodeResponse
response
messageDecoder
(\error ->
case communication of
SignIn _ ->
U.UpdateSignIn (ErrorLogin error)
_ ->
U.NoOp
)
|> Task.succeed
decodeResponse : Http.Response -> Decoder a -> (a -> U.Action) -> U.Action
decodeResponse response decoder responseToAction =
case response.value of
Http.Text text ->
case decodeString decoder text of
Ok x ->
responseToAction x
Err _ ->
U.NoOp
Http.Blob _ ->
U.NoOp
|
