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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 Parameters.Parser exposing (Error(..), parseBool, parseColorSchema, parseInt, parseLength, parseLoopStyle)

import Length exposing (Length, mm, toMM)
import Parameters exposing (ColorSchema(..), LoopStyle(..))
import Parameters.Constraints as Constraints


type Error
    = MissingValue
    | BelowMin Float
    | AboveMax Float
    | NotALength
    | NotAnInt
    | NonexistentVariant String
    | NotABool


parseInt : Constraints.NumberConstraints Int -> String -> Result Error Int
parseInt constraints text =
    case text of
        "" ->
            Err MissingValue

        _ ->
            let
                min =
                    constraints.min
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if x >= m then
                                            Ok x

                                        else
                                            Err (BelowMin (toFloat m))
                                    )
                            )
                        |> Maybe.withDefault identity

                max =
                    constraints.max
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if x <= m then
                                            Ok x

                                        else
                                            Err (AboveMax (toFloat m))
                                    )
                            )
                        |> Maybe.withDefault identity
            in
            String.toInt text
                |> Result.fromMaybe NotAnInt
                |> min
                |> max


parseLength : Constraints.NumberConstraints Length -> String -> Result Error Length
parseLength constraints text =
    case text of
        "" ->
            Err MissingValue

        _ ->
            let
                min =
                    constraints.min
                        |> Maybe.map toMM
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if toMM x >= m then
                                            Ok x

                                        else
                                            Err (BelowMin m)
                                    )
                            )
                        |> Maybe.withDefault identity

                max =
                    constraints.max
                        |> Maybe.map toMM
                        |> Maybe.map
                            (\m ->
                                Result.andThen
                                    (\x ->
                                        if toMM x <= m then
                                            Ok x

                                        else
                                            Err (AboveMax m)
                                    )
                            )
                        |> Maybe.withDefault identity
            in
            String.toFloat text
                |> Maybe.map mm
                |> Result.fromMaybe NotALength
                |> min
                |> max


parseBool : String -> Result Error Bool
parseBool text =
    case text of
        "true" ->
            Ok True

        "false" ->
            Ok False

        _ ->
            Err NotABool


parseColorSchema : String -> Result Error ColorSchema
parseColorSchema text =
    case text of
        "white-on-black" ->
            Ok WhiteOnBlack

        "black-on-white" ->
            Ok BlackOnWhite

        _ ->
            Err (NonexistentVariant text)


parseLoopStyle : String -> Result Error LoopStyle
parseLoopStyle text =
    case text of
        "simple" ->
            Ok Simple

        "folded" ->
            Ok Folded

        _ ->
            Err (NonexistentVariant text)