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-- Copyright 2026 Shota FUJI
--
-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at https://mozilla.org/MPL/2.0/.
--
-- SPDX-License-Identifier: MPL-2.0


module Main exposing (main)

import Browser
import Browser.Navigation exposing (Key)
import Html exposing (node, p, text)
import Html.Attributes exposing (attribute)
import Parameters exposing (Parameters)
import Template exposing (template)
import Url exposing (Url)


main : Program Flags Model Msg
main =
    Browser.application
        { init = init
        , view = view
        , update = update
        , subscriptions = subscriptions
        , onUrlRequest = UrlRequested
        , onUrlChange = UrlChanged
        }



-- FLAGS


type alias Flags =
    ()



-- MODEL


type alias Model =
    { url : Url
    , key : Key
    , parameters : Parameters
    }


init : Flags -> Url -> Key -> ( Model, Cmd Msg )
init _ url key =
    ( { url = url, key = key, parameters = Parameters.default }, Cmd.none )



-- UPDATE


type Msg
    = NoOp
    | UrlRequested Browser.UrlRequest
    | UrlChanged Url


update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    case msg of
        NoOp ->
            ( model, Cmd.none )

        UrlRequested (Browser.Internal url) ->
            ( model, Browser.Navigation.replaceUrl model.key (Url.toString url) )

        UrlRequested (Browser.External href) ->
            ( model, Browser.Navigation.load href )

        UrlChanged url ->
            ( { model | url = url }, Cmd.none )



-- VIEW


view : Model -> Browser.Document Msg
view model =
    { title = ""
    , body =
        [ node "x-app-layout"
            []
            [ node "x-preview"
                [ attribute "slot" "preview" ]
                [ template model.parameters [] ]
            , node "x-panel"
                [ attribute "slot" "parameters" ]
                [ p [] [ text "Parameters" ] ]
            ]
        ]
    }



-- SUBSCRIPTIONS


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