{-# LANGUAGE FlexibleContexts #-}
module OpenSCAD.Carpentry
(
  place
, placeAlong
, v3box
, v3translate
  ) where

import           Control.Lens
import           Graphics.OpenSCAD
import           Linear.V3

v3box :: R3 t => t Double -> Model3d
v3box v = box (v ^. _x) (v ^. _y) (v ^. _z)

v3translate :: (Vector (c, c, c), R3 t) => t c -> Model (c, c, c) -> Model (c, c, c)
v3translate v m = translate (v ^. _x, v ^. _y, v ^. _z) $ m
--  ^ doesn't work ??

place :: (R3 t1, R3 t2) => t2 Double -> [t1 Double] -> [Model (Double, Double, Double)]
place board positions = map boardAt positions
  where
    boardAt p = translate (p ^. _x, p ^. _y, p ^. _z) $ v3box board
--    boardAt p = v3translate p $ v3box board

-- placeAlong (V3 2 4 16) (V3 0 0 0) (_x +~ 4) _x (<= 20)
placeAlong :: (R3 t1, R3 t2) => t2 Double -> t1 Double -> (t1 Double -> t1 Double) -> ((t3 -> Const t3 t3) -> t1 Double -> Const t3 (t1 Double)) -> (t3 -> Bool) -> [Model (Double, Double, Double)]
placeAlong board initial shift targ cond =
  place board positions
  where positions =
          let next x =
                let p = x & shift
                in if cond (p ^. targ)
                   then p : next p
                   else []
          in initial : next initial