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|
module Main exposing (..)
import Html exposing (Html, text, div, span)
import Html.Attributes exposing (style)
import Json.Decode exposing (..)
import Http
-- Material design imports
import Material
import Material.Card as Card
import Material.Color as Color
import Material.Grid exposing (grid, cell, size, Device(..))
import Material.Layout as Layout
import Material.Scheme as Scheme
import Material.Options as Options
-- API interface to Gemma
type alias Task =
{ name : String
, description : Maybe String
, remaining : Int
}
emptyStringFilter s =
if s == "" then
Nothing
else
Just s
decodeEmptyString : Decoder (Maybe String)
decodeEmptyString =
map emptyStringFilter string
decodeTask : Decoder Task
decodeTask =
map3 Task
(field "name" string)
(field "description" decodeEmptyString)
(field "remaining" int)
loadTasks : Cmd Msg
loadTasks =
let
request =
Http.get "http://localhost:4242/tasks" (list decodeTask)
in
Http.send NewTasks request
completeTask : Task -> Cmd Msg
completeTask task =
let
request =
Http.getString
(String.concat
[ "http://localhost:4242/complete?task="
, task.name
]
)
in
Http.send (\_ -> LoadTasks) request
-- Elm architecture implementation
type Msg
= None
| LoadTasks
| NewTasks (Result Http.Error (List Task))
| Mdl (Material.Msg Msg)
| Complete Task
type alias Model =
{ tasks : List Task
, error : Maybe String
, mdl : Material.Model
}
update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
case msg of
LoadTasks ->
( model, loadTasks )
Complete task ->
( model, completeTask task )
NewTasks (Ok tasks) ->
( { model | tasks = tasks, error = Nothing }, Cmd.none )
NewTasks (Err err) ->
( { model | error = Just (toString err) }, Cmd.none )
_ ->
( model, Cmd.none )
-- View implementation
white =
Color.text Color.white
taskColor : Task -> Color.Hue
taskColor task =
if task.remaining > 2 then
Color.Green
else if task.remaining < 0 then
Color.Red
else
Color.Yellow
within : Task -> String
within task =
if task.remaining < 0 then
"This task is overdue!"
else if task.remaining > 2 then
String.concat
[ "Relax, this task has "
, toString task.remaining
, " days left before it is due."
]
else
String.concat
[ "This task should be completed within "
, toString task.remaining
, " days. Consider doing it now!"
]
renderTask : Task -> Html Msg
renderTask task =
Card.view
[ Color.background (Color.color (taskColor task) Color.S800) ]
[ Card.title [] [ Card.head [ white ] [ text task.name ] ]
, Card.text [ white ]
[ text (Maybe.withDefault "" task.description)
, Html.br [] []
, text (within task)
]
, Card.actions
[ Card.border
, white
, Options.onClick (Complete task)
]
[ text "Done!" ]
]
gemmaView : Model -> Html Msg
gemmaView model =
grid []
(List.map (\t -> cell [ size All 3 ] [ renderTask t ])
model.tasks
)
view : Model -> Html Msg
view model =
gemmaView model |> Scheme.top
main : Program Never Model Msg
main =
let
model =
{ tasks = []
, error = Nothing
, mdl = Material.model
}
in
Html.program
{ init = ( model, Cmd.batch [ loadTasks, Material.init Mdl ] )
, view = view
, update = update
, subscriptions = Material.subscriptions Mdl
}
|
