module Main exposing (main)

import Browser
import Browser.Navigation as Nav
import Html exposing (..)
import Html.Attributes exposing (..)
import Model exposing (Model)
import Navigation
import Url
import Url.Parser


main =
    Browser.application
        { init = init
        , onUrlChange = UrlChanged
        , onUrlRequest = LinkClicked
        , subscriptions = subscriptions
        , update = update
        , view = view
        }


{-| currently no flags are needed
that's the reason for the generic type and \_ as param name
-}
init : { userUuid : String } -> Url.Url -> Nav.Key -> ( Model, Cmd Msg )
init flags url key =
    let
        route : Navigation.Route
        route =
            Url.Parser.parse Navigation.routeParser url
                |> Maybe.withDefault Navigation.Home

        initInfo : Model.InitInfo
        initInfo =
            Model.InitInfo key route url flags.userUuid

        model : Model
        model =
            Model.initialModel initInfo
    in
    routeChanged route model


subscriptions : Model -> Sub Msg
subscriptions _ =
    Sub.none


type Msg
    = UrlChanged Url.Url
    | LinkClicked Browser.UrlRequest


update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        -- Navigation based messages
        LinkClicked urlRequest ->
            Navigation.linkClicked urlRequest model.key model

        UrlChanged url ->
            case Url.Parser.parse Navigation.routeParser url of
                Just route ->
                    routeChanged route model

                Nothing ->
                    -- TODO error reporting
                    ( { model | route = Navigation.Home }, Cmd.none )


routeChanged : Navigation.Route -> Model -> ( Model, Cmd Msg )
routeChanged route model =
    case route of
        Navigation.Home ->
            ( { model | route = route }
            , Cmd.none
            )


view : Model -> Browser.Document Msg
view model =
    { title = "Open-Retro"
    , body =
        [ h1 [ class "app-title" ] [ text "Open-Retro" ]
        , nav []
            [ ul []
                [ li []
                    [ input [ placeholder "Board ID..." ] []
                    ]
                , li []
                    [ text "⊕ New board"
                    ]
                ]
            ]
        , main_ [] (appContent model)
        , node "link" [ rel "stylesheet", href "/compiled/css/style.css" ] []
        ]
    }


appContent : Model -> List (Html Msg)
appContent model =
    case model.route of
        Navigation.Home ->
            homePage model


homePage : Model -> List (Html Msg)
homePage model =
    []