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module Main exposing (..)

import Html exposing (..)
import Html.Attributes exposing (id, value)
import Json.Decode as Json exposing (Decoder, string, at)
import Html.Events exposing (on)


main =
    beginnerProgram
        { model = model
        , update = update
        , view = view
        }



-- TYPES


type alias SelectItem =
    { value : String
    , text : String
    }


type alias Model =
    { message : String
    , selectOne : List SelectItem
    , selectTwo : List SelectItem
    , selectedOneValue : String
    , selectedTwoValue : String
    }


type Msg
    = ChangeMeal String
    | ChangeTime String



-- MODEL
-- Normally, we have an init, subscriptions, etc. but for simplicity, this uses
-- the beginner program.


model : Model
model =
    { message = "Select an item!"
    , selectOne =
        [ SelectItem "time-period-na" "--"
        , SelectItem "time-period-all" "All time"
        , SelectItem "time-period-week" "One Week"
        , SelectItem "time-period-24h" "24h"
        ]
    , selectTwo =
        [ SelectItem "fish" "The Salmon"
        , SelectItem "chicken" "Le Poulet"
        , SelectItem "stew" "Beef Bourguignon"
        , SelectItem "vegetarian" "Vegetable Terrine"
        ]
    , selectedOneValue = "time-period-na"
    , selectedTwoValue = "fish"
    }



-- returns a zero-indexed integer of selected. Not so useful! Boo!


onSelectIndex : (Int -> msg) -> Html.Attribute msg
onSelectIndex message =
    on "change" <| Json.map message <| Json.at [ "target", "selectedIndex" ] Json.int



-- returns the value of the target value. More useful! Yay!
-- (e.g. this is what would be returned if you submitted a form)


onSelectValue : (String -> msg) -> Attribute msg
onSelectValue message =
    Json.at [ "target", "value" ] Json.string
        |> Json.map message
        |> Html.Events.on "change"



-- UPDATE


update : Msg -> Model -> Model
update msg model =
    case msg of
        ChangeTime value ->
            { model | selectedOneValue = value }

        ChangeMeal value ->
            { model | selectedTwoValue = value }



-- VIEW


viewSelect : List SelectItem -> List (Html Msg)
viewSelect itemList =
    itemList
        |> List.map
            (\item ->
                option [ value item.value ] [ text item.text ]
            )


view : Model -> Html Msg
view model =
    div []
        [ h1 [] [ text "Reactive 'select' in Elm 0.18!" ]
        , h3 [] [ text "See? Not so hard ;)" ]
        , p [] [ text model.message ]
        , select [ onSelectValue ChangeTime ] (viewSelect model.selectOne)
        , p [] [ text ("You selected item with value == " ++ model.selectedOneValue) ]
        , select [ onSelectValue ChangeMeal ] (viewSelect model.selectTwo)
        , p [] [ text ("You selected item with value == " ++ model.selectedTwoValue) ]
        ]