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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 exposing (..)

import Length exposing (Length, mm)


type TipShape
    = Round


type Profile
    = Straight


type alias BuckleHole =
    -- Offset from the case side (lug side.)
    { offset : Length

    -- Number of buckle holes, can be 0.
    , count : Int

    -- Center-to-center.
    , interval : Length

    -- TODO: Support non circular holes.
    , diameter : Length
    }


{-| Parameters for the long piece, which has buckle holes.
This does not have to be longer than `ShortPiece`.
-}
type alias LongPiece =
    { length : Length
    , tip : TipShape
    , buckleHole : BuckleHole
    , flap : Length
    }


type alias FixedLoop =
    { width : Length
    , play : Length
    , offset : Length
    }


type alias FreeLoop =
    { width : Length
    , play : Length
    }


{-| Parameters for the short piece, which has clasp at the end.
This does not have to be shorter than `LongPiece`.
-}
type alias ShortPiece =
    { length : Length
    , fixedLoop : Maybe FixedLoop
    , freeLoop : Maybe FreeLoop
    , caseSideFlap : Length
    , claspSideFlap : Length
    }


type CanvasSize
    = A4


canvasSizeDimension : CanvasSize -> ( Length, Length )
canvasSizeDimension size =
    case size of
        A4 ->
            ( mm 210, mm 297 )


type alias Parameters =
    { lugWidth : Length
    , longPiece : LongPiece
    , shortPiece : ShortPiece
    , profile : Profile
    , thickness : Length
    , lining : Maybe Length
    , canvasSize : CanvasSize
    }


default : Parameters
default =
    { lugWidth = mm 20
    , longPiece =
        { length = mm 112
        , tip = Round
        , buckleHole =
            { offset = mm 50
            , count = 7
            , interval = mm 6
            , diameter = mm 3
            }
        , flap = mm 15
        }
    , shortPiece =
        { length = mm 80
        , fixedLoop =
            Just
                { offset = mm 8
                , width = mm 6
                , play = mm 1
                }
        , freeLoop =
            Just
                { width = mm 5
                , play = mm 2
                }
        , caseSideFlap = mm 15
        , claspSideFlap = mm 20
        }
    , profile = Straight
    , thickness = mm 2.5
    , lining = Just (mm 0.5)
    , canvasSize = A4
    }