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module Main exposing (..)

import Html.App as Html
import Html exposing (..)
import Html.Events exposing (..)
import Html.Attributes exposing (..)
import Json.Decode as Json
import Debug exposing (..)

main : Program Never
main =
  Html.beginnerProgram
    { model = { value = 0 }
    , view = view
    , update = update
    }

-- MODEL
type alias Model = { value : Int }

-- VIEW
view : Model -> Html Msg
view model =
  let
    onNumInput : Json.Decoder Msg
    onNumInput =
      Json.map UpdateNum <|
        Json.at ["target", "valueAsNumber"] Json.int
  in input
       [ type' "number"
       , on "change" onNumInput
       , value (toString model.value)
       ]
       []

-- UPDATE
type Msg = UpdateNum Int

update : Msg -> Model -> Model
update msg model =
  case msg of
    UpdateNum newval ->
      log "model" { model | value = newval }

port module Main exposing (..)

import Html.App as Html
import Html exposing (..)
import Html.Events exposing (..)
import Html.Attributes exposing (..)
import Json.Decode as Json
import Debug exposing (..)

main : Program Never
main =
  Html.program
    { init = { value = 0 } ! []
    , view = view
    , update = update
    , subscriptions = subscriptions
    }

-- MODEL
type alias Model = { value : Int }

-- VIEW
view : Model -> Html Msg
view model =
  let
    onNumInput : Json.Decoder Msg
    onNumInput =
      Json.map UpdateNum <|
        Json.at ["target", "valueAsNumber"] Json.int
  in input
       [ type' "number"
       , on "change" onNumInput
       , value (toString model.value)
       ]
       []

-- UPDATE
type Msg = UpdateNum Int

update : Msg -> Model -> (Model, Cmd Msg)
update msg model =
  case msg of
    UpdateNum newval ->
      (log "model" { model | value = newval }) ! []

-- SUBSCRIPTIONS

subscriptions : Model -> Sub Msg
subscriptions model =
  externalfeed UpdateNum

port externalfeed : (Int -> msg) -> Sub msg