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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.Attributes exposing (attribute)
import Html.LivingStandard exposing (..)
import Json.Decode
import Parameters
import Parameters.App
import Parameters.Parser
import Preferences exposing (FieldHighlight(..))
import Preferences.App
import Template exposing (template)
import Url exposing (Url)
import Url.SearchParams


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.App.Model
    , preferences : Preferences.App.Model
    }


init : Flags -> Url -> Key -> ( Model, Cmd Msg )
init flags url key =
    let
        parameters =
            case Maybe.map Url.SearchParams.parse url.query of
                Just dict ->
                    -- TODO: Handle and present errors to a user
                    Parameters.Parser.parse dict
                        |> Result.withDefault Parameters.default

                Nothing ->
                    Parameters.default

        ( parametersModel, parametersCmd ) =
            Parameters.App.init url key parameters
    in
    ( { url = url
      , key = key
      , parameters = parametersModel
      , preferences = Preferences.App.init flags.preferences
      }
    , Cmd.map ParametersMsg parametersCmd
    )



-- UPDATE


type Msg
    = NoOp
    | ParametersMsg Parameters.App.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 )

        ParametersMsg subMsg ->
            Parameters.App.update subMsg model.parameters
                |> Tuple.mapFirst (\p -> { model | parameters = p })
                |> Tuple.mapSecond (Cmd.map ParametersMsg)

        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 =
    let
        highlighting =
            case model.preferences.preferences.fieldHighlight of
                HighlightOnPreview ->
                    model.parameters.highlighting

                DoNotHighlight ->
                    Nothing
    in
    { title = ""
    , body =
        [ node "x-app-layout"
            []
            [ node "x-preview"
                [ slot "preview"
                , attribute "print-theme"
                    (case model.parameters.parameters.rendering.colorSchema of
                        Parameters.BlackOnWhite ->
                            "black-on-white"

                        Parameters.WhiteOnBlack ->
                            "white-on-black"
                    )
                , attribute "preview-theme"
                    (case model.preferences.preferences.previewTheme of
                        Preferences.SystemTheme ->
                            "system"

                        Preferences.PrintTheme ->
                            "print"
                    )
                ]
                [ template model.parameters.parameters highlighting [] ]
            , node "x-panel"
                [ slot "parameters" ]
                [ node "x-parameters"
                    []
                    ((Parameters.App.view
                        model.parameters
                        |> List.map (Html.map ParametersMsg)
                     )
                        ++ hr [] []
                        :: (Preferences.App.panelItems model.preferences |> List.map (Html.map PreferencesMsg))
                    )
                ]
            ]
        ]
    }



-- SUBSCRIPTIONS


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