port module Main exposing (..)

import Browser
import Element exposing (Element)
import Element.Border as Border
import Element.Input as Input
import Emoji
import Html
import Html.Attributes


main =
    Browser.element
        { init = init
        , update = update
        , subscriptions = \_ -> Sub.none
        , view = view
        }



-- MODEL --


type alias Model =
    { category : Emoji.Category
    }


init : () -> ( Model, Cmd Msg )
init _ =
    ( { category = Emoji.Recent }, Cmd.none )


type Msg
    = CategoryClicked Emoji.Category
    | Copy String



-- UPDATE --


update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        CategoryClicked category ->
            ( { model | category = category }, Cmd.none )

        Copy c ->
            ( model, copy c )



-- VIEW --


view : Model -> Html.Html Msg
view model =
    Element.layout []
        (Element.column [ Element.width (Element.px 512), Element.height (Element.px 512) ]
            [ header, panel (Emoji.getEmojis model.category) ]
        )


header : Element Msg
header =
    Element.row [ Element.width Element.fill, Element.padding 5, Element.spacing 10 ]
        (Emoji.categories
            |> List.map
                (\x ->
                    Input.button [ Element.padding 5, Border.color (Element.rgb255 0 0 0), Border.width 1, Border.rounded 5 ]
                        { label = Element.el [] (emoji (Emoji.categoryEmoji x))
                        , onPress = Just (CategoryClicked x)
                        }
                )
        )


panel : List Emoji.Emoji -> Element Msg
panel em =
    em
        |> regroup 10
        |> List.map (\x -> List.map maybeEmoji x)
        |> List.map (Element.row [ Element.width Element.fill ])
        |> Element.column [ Element.width (Element.px 512), Element.height (Element.px 512), Element.scrollbarY ]


emoji : Emoji.Emoji -> Element Msg
emoji e =
    Input.button [ Element.htmlAttribute (Html.Attributes.title e.name), Element.centerX, Element.centerY ]
        { label = Element.text e.unicode, onPress = Just (Copy e.unicode) }


maybeEmoji : Maybe Emoji.Emoji -> Element Msg
maybeEmoji e =
    Element.el [ Element.width Element.fill, Element.padding 10 ] (Maybe.map emoji e |> Maybe.withDefault Element.none)


regroup : Int -> List Emoji.Emoji -> List (List (Maybe Emoji.Emoji))
regroup num input =
    List.reverse (regroupAux [] [] num input)


regroupAux : List (List (Maybe Emoji.Emoji)) -> List (Maybe Emoji.Emoji) -> Int -> List Emoji.Emoji -> List (List (Maybe Emoji.Emoji))
regroupAux currentTotal currentPart num input =
    case input of
        [] ->
            if List.length currentPart < num then
                regroupAux currentTotal (Nothing :: currentPart) num []

            else
                List.reverse currentPart :: currentTotal

        h :: t ->
            if List.length currentPart >= num then
                regroupAux (List.reverse currentPart :: currentTotal) [ Just h ] num t

            else
                regroupAux currentTotal (Just h :: currentPart) num t



-- PORTS --


port copy : String -> Cmd msg