aboutsummaryrefslogtreecommitdiff
path: root/src/client/ServerCommunication.elm
blob: 9bf2008f0474b486573de1fdc359d4e2c9e068ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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.Payment exposing (PaymentId)

import Update as U
import Update.SignIn exposing (..)
import Update.Payment as UP

type Communication =
  NoCommunication
  | SignIn String
  | AddPayment String Int
  | DeletePayment PaymentId
  | 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
        |> Task.map (communicationToAction communication)

getRequest : Communication -> Maybe Http.Request
getRequest communication =
  case communication of
    NoCommunication ->
      Nothing
    SignIn login ->
      Just (simplePost ("/signIn?login=" ++ login))
    AddPayment name cost ->
      Just (simplePost ("/payment/add?name=" ++ name ++ "&cost=" ++ (toString cost)))
    DeletePayment paymentId ->
      Just (simplePost ("payment/delete?id=" ++ paymentId))
    SignOut ->
      Just (simplePost  "/signOut")

simplePost : String -> Http.Request
simplePost url =
  { verb = "post"
  , headers = []
  , url = url
  , body = Http.empty
  }

communicationToAction : Communication -> Http.Response -> U.Action
communicationToAction communication response =
  if response.status == 200
    then
      case communication of
        NoCommunication ->
          U.NoOp
        SignIn login ->
          U.UpdateSignIn (ValidLogin login)
        AddPayment name cost ->
          decodeResponse
            response
            (\id -> U.UpdatePayment (UP.AddPayment id name cost))
        DeletePayment id ->
          U.UpdatePayment (UP.Remove id)
        SignOut ->
          U.GoSignInView
    else
      decodeResponse
        response
        (\error ->
          case communication of
            SignIn _ ->
              U.UpdateSignIn (ErrorLogin error)
            _ ->
              U.NoOp
        )

decodeResponse : Http.Response -> (String -> U.Action) -> U.Action
decodeResponse response responseToAction =
  case response.value of
    Http.Text text ->
      case decodeString messageDecoder text of
        Ok x ->
          responseToAction x
        Err _ ->
          U.NoOp
    Http.Blob _ ->
      U.NoOp