From 1a48af859360e388c829f78ace708d32131d0a9b Mon Sep 17 00:00:00 2001
From: Sean Whitton <spwhitton@spwhitton.name>
Date: Sat, 25 Feb 2017 14:20:14 -0700
Subject: UI elements to toggle state

---
 Main.hs  | 55 +++++++++++++++++++++++++++++++++++++++++++------------
 Types.hs | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+), 12 deletions(-)
 create mode 100644 Types.hs

diff --git a/Main.hs b/Main.hs
index e844eab..32d7616 100644
--- a/Main.hs
+++ b/Main.hs
@@ -1,30 +1,27 @@
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TemplateHaskell   #-}
 
 import           Control.Monad        (void)
 import           Data.Monoid
 import qualified Graphics.Vty         as V
 import           Lens.Micro           ((&), (.~), (^.))
-import           Lens.Micro.TH        (makeLenses)
 
 import           Brick.AttrMap
 import           Brick.Main
+import           Brick.Markup         (markup, (@?))
 import           Brick.Types
+import           Brick.Util           (fg, on)
 import           Brick.Widgets.Border as B
 import           Brick.Widgets.Center as C
 import           Brick.Widgets.Core
+import           Data.Text.Markup     ((@@))
 
-data St =
-    St { _stExternalInput :: String
-       }
-
-makeLenses ''St
+import           Types
 
 drawUI :: St -> [Widget ()]
 drawUI st = [ui]
   where
     ui = vBox [ hBorderWithLabel (str "[ Status ]")
-              , padAll 1 $ C.center $ status
+              , C.center $ status
               , hBorderWithLabel (str "[ Current settings ]")
               , padAll 1 $ C.center $ settings
               , hBorderWithLabel (str "[ Presets ]")
@@ -33,20 +30,54 @@ drawUI st = [ui]
               , padAll 1 $ C.center $ actions
               ]
     status = str "Ready to scan first page"
-    settings = str "settings"
-    presets = str "presets"
+    settings = vBox [ str $ "run OCRmyPDF: " ++ if st^.stOCR then "yes" else "no"
+                    , str $ "colour data: " ++ (show $ st^.stColour)
+                    , str $ "page size: " ++ (show $ st^.stPaper)
+                    , str $ "DPI: " ++ (show $ st^.stDPI)
+                    ]
+    presets = vBox [ markup $ ("h:" @@ (V.withStyle V.currentAttr V.bold))
+                     <> (" handwritten notes" @@ fg V.white)
+                   ]
     actions = str "actions"
 
+appEvent :: St -> BrickEvent () e -> EventM () (Next St)
+appEvent st (VtyEvent e) =
+    case e of
+      -- settings toggles
+      V.EvKey (V.KChar 'o') [] -> continue $ st & stOCR .~ (not $ st^.stOCR)
+      V.EvKey (V.KChar 'c') [] -> continue $
+          st & stColour .~ (cycleColour $ st^.stColour)
+      V.EvKey (V.KChar 'p') [] -> continue $
+          st & stPaper .~ (cyclePaper $ st^.stPaper)
+
+      -- presets: set several settings toggles at once
+      V.EvKey (V.KChar 'h') [] -> continue $ st
+          { _stOCR = False
+          , _stColour = Greyscale
+          , _stDPI = 75
+          }
+
+      -- actions
+      V.EvKey (V.KChar 'q') [] -> halt st
+
+      _ -> continue st
+appEvent st _ = continue st
+
 initialState :: St
 initialState =
-    St { _stExternalInput = ""
+    St { _stScanningSession = Nothing
+       , _stOCR = True
+       , _stColour = Greyscale
+       , _stPaper = A4
+       , _stDPI = 300
+       , _stOutdir = ""
        }
 
 theApp :: App St e ()
 theApp =
     App { appDraw = drawUI
         , appChooseCursor = neverShowCursor
-        , appHandleEvent = resizeOrQuit
+        , appHandleEvent = appEvent
         , appStartEvent = return
         , appAttrMap = const $ attrMap V.defAttr []
         }
diff --git a/Types.hs b/Types.hs
new file mode 100644
index 0000000..721b00d
--- /dev/null
+++ b/Types.hs
@@ -0,0 +1,41 @@
+{-# LANGUAGE TemplateHaskell #-}
+
+module Types 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
+
+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
-- 
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