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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


port module Preferences.App exposing (Model, Msg, init, panelItems, update)

import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events
import Json.Decode as Decode
import Json.Encode as Encode
import Preferences exposing (Preferences, PreviewTheme(..))



-- PORTS


port writePreferences : Encode.Value -> Cmd msg



-- MODEL


type alias Model =
    { preferences : Preferences
    }


init : Decode.Value -> Model
init saved =
    case Decode.decodeValue Preferences.decoder saved of
        Ok preferences ->
            { preferences = preferences }

        Err _ ->
            -- TODO: Notify decode error
            { preferences = Preferences.defaultPreferences }



-- UPDATE


type Msg
    = NoOp
    | SetPreviewTheme PreviewTheme


update : Msg -> Model -> ( Model, Cmd Msg )
update msg model =
    let
        { preferences } =
            model
    in
    case msg of
        NoOp ->
            ( model, Cmd.none )

        SetPreviewTheme theme ->
            let
                nextPreferences =
                    { preferences | previewTheme = theme }
            in
            ( { model | preferences = { preferences | previewTheme = theme } }
            , writePreferences (Preferences.encode nextPreferences)
            )



-- VIEW


previewThemeId : String
previewThemeId =
    "preview-theme"


descriptionId : String -> String
descriptionId prefix =
    prefix ++ "_description"


type alias RadioBoxProps msg =
    { label : List (Html msg)
    , description : List (Html msg)
    , name : String
    , value : String
    , checked : Bool
    , onCheck : msg
    }


radioBox : RadioBoxProps msg -> List (Html.Attribute msg) -> Html msg
radioBox { label, description, name, value, checked, onCheck } attrs =
    let
        id =
            name ++ "_" ++ value
    in
    node "x-radio-box"
        [ if checked then
            attribute "checked" ""

          else
            class ""
        ]
        [ Html.label [ for id, attribute "slot" "label" ] label
        , Html.p [ Html.Attributes.id (descriptionId id), attribute "slot" "description" ] description
        , input
            (type_ "radio"
                :: Html.Attributes.id id
                :: Html.Attributes.name name
                :: Html.Attributes.value value
                :: Html.Attributes.checked checked
                :: Html.Events.onCheck (\_ -> onCheck)
                :: attrs
            )
            []
        ]


panelItems : Model -> List (Html Msg)
panelItems model =
    [ node "x-field-group"
        []
        [ p [ attribute "slot" "title" ] [ text "Preferences" ]
        , p [ attribute "slot" "description" ] [ text "These parameters are saved to this browser, and will not be shared." ]
        , node "x-field"
            []
            [ span [ attribute "slot" "title" ] [ text "Preview Color Theme" ]
            , p
                [ attribute "slot" "description"
                , id (descriptionId previewThemeId)
                ]
                [ text "This does not affect print output." ]
            , radioBox
                { label = [ text "Use system theme" ]
                , description =
                    [ text "Toggle light and dark mode automatically based on your system's dark mode setting." ]
                , name = previewThemeId
                , value = "system"
                , checked = model.preferences.previewTheme == SystemTheme
                , onCheck = SetPreviewTheme SystemTheme
                }
                []
            , radioBox
                { label = [ text "Use print theme" ]
                , description = [ text "Preview in printed color. Output image will be exactly same to the preview." ]
                , name = previewThemeId
                , value = "print"
                , checked = model.preferences.previewTheme == PrintTheme
                , onCheck = SetPreviewTheme PrintTheme
                }
                []
            ]
        ]
    ]