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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 (hr, node, p)
import Html.LivingStandard exposing (..)
import Json.Decode
import Parameters exposing (Parameters)
import Parameters.Form
import Preferences.App
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 =
    { preferences : Json.Decode.Value
    }



-- MODEL


type alias Model =
    { url : Url
    , key : Key
    , parameters : Parameters
    , parametersForm : Parameters.Form.Model
    , preferences : Preferences.App.Model
    }


init : Flags -> Url -> Key -> ( Model, Cmd Msg )
init flags url key =
    let
        parameters =
            Parameters.default
    in
    ( { url = url
      , key = key
      , parameters = parameters
      , parametersForm = Parameters.Form.init parameters
      , preferences = Preferences.App.init flags.preferences
      }
    , Cmd.none
    )



-- UPDATE


type Msg
    = NoOp
    | ParametersFormMsg Parameters.Form.Msg
    | PreferencesMsg Preferences.App.Msg
    | UrlRequested Browser.UrlRequest
    | UrlChanged Url


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

        ParametersFormMsg (Parameters.Form.ParametersChangeRequested newParams) ->
            ( { model | parameters = newParams }, Cmd.none )

        ParametersFormMsg subMsg ->
            Parameters.Form.update subMsg model.parametersForm
                |> Tuple.mapFirst (\p -> { model | parametersForm = p })
                |> Tuple.mapSecond (Cmd.map ParametersFormMsg)

        PreferencesMsg subMsg ->
            Preferences.App.update subMsg model.preferences
                |> Tuple.mapFirst (\p -> { model | preferences = p })
                |> Tuple.mapSecond (Cmd.map PreferencesMsg)

        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"
                [ slot "preview" ]
                [ template model.parameters [] ]
            , node "x-panel"
                [ slot "parameters" ]
                [ node "x-parameters"
                    []
                    ((Parameters.Form.view
                        model.parametersForm
                        model.parameters
                        |> List.map (Html.map ParametersFormMsg)
                     )
                        ++ hr [] []
                        :: (Preferences.App.panelItems model.preferences |> List.map (Html.map PreferencesMsg))
                    )
                ]
            ]
        ]
    }



-- SUBSCRIPTIONS


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