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+{-# LANGUAGE TemplateHaskell #-}
+
+module Types.State where
+
+import           Lens.Micro.TH        (makeLenses)
+
+-- | Whether to do colour, grey or b&w scans
+data Colour = Lineart | Greyscale | Colour
+    deriving (Eq, Show)
+
+cycleColour :: Colour -> Colour
+cycleColour Lineart   = Greyscale
+cycleColour Greyscale = Colour
+cycleColour Colour    = Lineart
+
+-- | Paper size to scan (determines both scanning area and PDF page
+-- size)
+data Paper = A4 | Letter | Photo | Auto
+    deriving (Eq, Show)
+
+cyclePaper :: Paper -> Paper
+cyclePaper A4     = Letter
+cyclePaper Letter = Photo
+cyclePaper Photo  = Auto
+cyclePaper Auto   = A4
+
+-- | DPI to scan
+type DPI = Int
+
+-- | Application state
+data St =
+    St { _stScanningSession :: Maybe FilePath -- ^ if a session is in
+                                              -- progress, accmulate
+                                              -- scans in this dir
+       , _stOCR             :: Bool -- ^ whether to use OCRmyPDF
+       , _stColour          :: Colour
+       , _stPaper           :: Paper
+       , _stDPI             :: DPI
+       , _stOutdir          :: FilePath -- ^ where to save final PDFs
+       }
+
+makeLenses ''St