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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 (FieldHighlight(..), 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"
        )


type FieldHighlight
    = HighlightOnPreview
    | DoNotHighlight


fieldHighlightDecoder : Decode.Decoder FieldHighlight
fieldHighlightDecoder =
    Decode.string
        |> Decode.andThen
            (\str ->
                case str of
                    "highlight_on_preview" ->
                        Decode.succeed HighlightOnPreview

                    "do_not_highlight" ->
                        Decode.succeed DoNotHighlight

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


encodeFieldHighlight : FieldHighlight -> Decode.Value
encodeFieldHighlight status =
    Encode.string
        (case status of
            HighlightOnPreview ->
                "highlight_on_preview"

            DoNotHighlight ->
                "do_not_highlight"
        )


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


defaultPreferences : Preferences
defaultPreferences =
    { previewTheme = SystemTheme
    , fieldHighlight = DoNotHighlight
    }


{-| This decoder should not fail for backwards/forwards compatibility.
Always fallback to safe defaults.
-}
decoder : Decode.Decoder Preferences
decoder =
    Decode.map2
        Preferences
        (Decode.oneOf
            [ Decode.field "preview_theme" previewThemeDecoder
            , Decode.succeed defaultPreferences.previewTheme
            ]
        )
        (Decode.oneOf
            [ Decode.field "field_highlight" fieldHighlightDecoder
            , Decode.succeed defaultPreferences.fieldHighlight
            ]
        )


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