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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 Preferences exposing (Preferences, PreviewTheme(..), decoder, defaultPreferences, encode)

import Json.Decode as Decode
import Json.Encode as Encode


type PreviewTheme
    = SystemTheme
    | PrintTheme


previewThemeDecoder : Decode.Decoder PreviewTheme
previewThemeDecoder =
    Decode.string
        |> Decode.andThen
            (\str ->
                case str of
                    "system" ->
                        Decode.succeed SystemTheme

                    "print" ->
                        Decode.succeed PrintTheme

                    _ ->
                        Decode.fail ("\"" ++ str ++ "\" is not a valid PreviewTheme")
            )


encodePreviewTheme : PreviewTheme -> Encode.Value
encodePreviewTheme theme =
    Encode.string
        (case theme of
            SystemTheme ->
                "system"

            PrintTheme ->
                "print"
        )


{-| User preferences. This is not supposed to be shared.
-}
type alias Preferences =
    { previewTheme : PreviewTheme
    }


defaultPreferences : Preferences
defaultPreferences =
    { previewTheme = SystemTheme
    }


decoder : Decode.Decoder Preferences
decoder =
    Decode.map
        Preferences
        (Decode.field "preview_theme"
            (Decode.oneOf [ previewThemeDecoder, Decode.succeed defaultPreferences.previewTheme ])
        )


encode : Preferences -> Encode.Value
encode p =
    Encode.object
        [ ( "preview_theme", encodePreviewTheme p.previewTheme ) ]