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{-# LANGUAGE RecordWildCards #-}
import           Control.Lens
import           Graphics.OpenSCAD
import           Linear.V3

genscad :: [(V3 Double, V3 Double)] -> String
genscad = render . transBoxes

transBoxes :: [(V3 Double, V3 Double)] -> Model Vector3d
transBoxes = union . map transBox

transBox :: (V3 Double, V3 Double) -> Model3d
transBox (V3 x1 y1 z1, V3 x2 y2 z2) = translate (x1,y1,z1) $ box x2 y2 z2

type Inches = Double

data Shelf = Shelf {
  shelfThickness :: Inches,
  shelfWidth     :: Inches,
  shelfLength    :: Inches,
  shelfHeights   :: [Inches],
  shelfSideDimX  :: Inches
}

shelves' :: Shelf -> [(V3 Double, V3 Double)]
shelves' Shelf{..} = [(p, V3 shelfLength shelfWidth shelfThickness) | p <- shelvesPos]
  where
    shelfHeight = sum shelfHeights + (shelfThickness * (fromIntegral (length shelfHeights) + 1))

    shelfSideDim :: V3 Inches
    shelfSideDim = V3 shelfSideDimX shelfWidth shelfHeight

    shelfYPos :: [Inches]
    shelfYPos = scanl (+) 0 [h+shelfThickness| h <- shelfHeights]

    shelvesPos :: [V3 Double]
    shelvesPos = [V3 (shelfSideDim ^. _x) 0 y | y <- shelfYPos]

myShelf :: Shelf
myShelf = Shelf {
  shelfThickness = 0.5,
  shelfWidth = 8,
  shelfLength = 36 * 2,
  shelfHeights = [12, 10, 8, 8, 8, 8, 8],
  shelfSideDimX = 0.5
}

modelShelf :: Shelf -> Model3d
modelShelf = transBoxes . shelves'

main :: IO ()
main = draw $ modelShelf myShelf