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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
port module Main exposing (..)
import Browser exposing (Document)
import Browser.Navigation exposing (Key)
import Config exposing (makeApiUrl)
import Header exposing (headerView)
import Html.Styled exposing (..)
import Http
import Json.Decode exposing (Decoder, field, int, list, map2, map6, string)
import Json.Encode
import Pages.Feed exposing (feedView)
import RemoteData
import Task
import Time
import Types exposing (Author, Model, Msg(..), Post, UserData)
import Url exposing (Url)
import Utils exposing (httpErrorToString, listFlat)
main : Program UserData Model Msg
main =
Browser.application
{ init = init
, view = view
, update = update
, subscriptions = subscriptions
, onUrlRequest = \_ -> NoOp
, onUrlChange = \_ -> NoOp
}
-- PORTS
port showAlert : String -> Cmd msg
port requestLogout : () -> Cmd msg
-- INIT
init : UserData -> Url -> Key -> ( Model, Cmd Msg )
init userData _ key =
( { now = Time.millisToPosix 0
, key = key
, userData = userData
, posts = RemoteData.Loading
, composeInputValue = ""
}
, Cmd.batch
[ getPosts
, Task.perform SetNowPosix Time.now
]
)
-- UPDATE
update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
case msg of
NoOp ->
( model, Cmd.none )
SetNowPosix now ->
( { model | now = now }, Cmd.none )
RequestLogout ->
( model, requestLogout () )
GetPosts ->
( model, getPosts )
GotPosts (Result.Ok posts) ->
( { model | posts = RemoteData.Success posts }, Cmd.none )
GotPosts (Result.Err httpErr) ->
( { model | posts = RemoteData.Failure httpErr }
, showAlert <| httpErrorToString httpErr
)
LikePost post ->
( model, likePost post )
LikedPost (Result.Ok post) ->
( { model | posts = RemoteData.map (replaceMatchingPost post) model.posts }
, Cmd.none
)
LikedPost (Result.Err httpErr) ->
( model
, showAlert <| httpErrorToString httpErr
)
ComposeInputChanged value ->
( { model | composeInputValue = value }, Cmd.none )
ComposePost ->
( model
, if String.length model.composeInputValue > 0 then
composePost model
else
Cmd.none
)
ComposedPost (Result.Ok post) ->
( { model
| posts = RemoteData.map (\posts -> post :: posts) model.posts
, composeInputValue = ""
}
, Cmd.none
)
ComposedPost (Result.Err httpErr) ->
( model
, showAlert <| httpErrorToString httpErr
)
replaceMatchingPost : Post -> List Post -> List Post
replaceMatchingPost post posts =
List.map
(\p ->
if p.id == post.id then
post
else
p
)
posts
getPosts : Cmd Msg
getPosts =
Http.get
{ url = makeApiUrl Config.ApiPosts
, expect = Http.expectJson GotPosts postsDecoder
}
likePost : Post -> Cmd Msg
likePost post =
Http.request
{ method = "PATCH"
, headers = []
, url = makeApiUrl (Config.ApiLikePost post.id)
, body =
Http.jsonBody
(Json.Encode.object
[ ( "likes", Json.Encode.int (post.likes + 1) ) ]
)
, expect = Http.expectJson LikedPost postDecoder
, timeout = Nothing
, tracker = Nothing
}
composePost : Model -> Cmd Msg
composePost model =
Http.post
{ url = makeApiUrl Config.ApiCompose
, expect = Http.expectJson ComposedPost postDecoder
, body =
Http.jsonBody
(Json.Encode.object
[ ( "content", Json.Encode.string model.composeInputValue )
, ( "createdAt", Json.Encode.int <| Time.posixToMillis model.now // 1000 )
, ( "likes", Json.Encode.int 0 )
, ( "userPictureUrl", Json.Encode.string model.userData.pictureUrl )
, ( "author"
, Json.Encode.object
[ ( "id", Json.Encode.string model.userData.email )
, ( "name", Json.Encode.string model.userData.name )
]
)
]
)
}
subscriptions : Model -> Sub Msg
subscriptions _ =
Time.every 5000 SetNowPosix
-- JSON
decodeTime : Decoder Time.Posix
decodeTime =
int
|> Json.Decode.andThen
(\ms ->
Json.Decode.succeed <| Time.millisToPosix (ms * 1000)
)
postsDecoder : Decoder (List Post)
postsDecoder =
list postDecoder
postDecoder : Decoder Post
postDecoder =
map6 Post
(field "id" string)
(field "content" string)
(field "author"
(map2 Author
(field "id" string)
(field "name" string)
)
)
(field "createdAt" decodeTime)
(field "likes" int)
(field "userPictureUrl" string)
-- VIEW
view : Model -> Document Msg
view model =
{ title = "SOMEBOOK"
, body =
[ headerView model, feedView model ]
|> listFlat
|> List.map toUnstyled
}
|
