{-# LANGUAGE ScopedTypeVariables #-}

-----------------------------------------------------------------------------
-- |
-- Module      : Hoodle.Coroutine.Layer 
-- Copyright   : (c) 2011-2013 Ian-Woo Kim
--
-- License     : GPL-3
-- Maintainer  : Ian-Woo Kim <ianwookim@gmail.com>
-- Stability   : experimental
-- Portability : GHC
--
-----------------------------------------------------------------------------

module Hoodle.Coroutine.Layer where

import Control.Monad.State
import qualified Data.IntMap as M
import Control.Category
-- import Data.Label
import Control.Lens (view,set)
import Data.IORef
import Graphics.UI.Gtk hiding (get,set)
--
import Data.Hoodle.Generic
import Data.Hoodle.Zipper
import Graphics.Hoodle.Render.Type 
-- 
import Hoodle.Accessor
import Hoodle.Coroutine.Commit
import Hoodle.Coroutine.Draw
import Hoodle.ModelAction.Layer
import Hoodle.ModelAction.Page
import Hoodle.Type.Alias 
import Hoodle.Type.Canvas
import Hoodle.Type.Coroutine
import Hoodle.Type.HoodleState
-- 
import Prelude hiding ((.),id)


layerAction :: (HoodleModeState -> Int -> Page EditMode -> MainCoroutine HoodleModeState) 
            -> MainCoroutine HoodleState
layerAction action = do 
    xst <- get 
    forBoth' unboxBiAct (fsingle xst) . view currentCanvasInfo $ xst
  where 
    fsingle xstate cvsInfo = do
      let epage = getCurrentPageEitherFromHoodleModeState cvsInfo hdlmodst
          cpn = view currentPageNum cvsInfo
          hdlmodst = view hoodleModeState xstate
      newhdlmodst <- either (action hdlmodst cpn) (action hdlmodst cpn . hPage2RPage) epage 
      return =<< (liftIO (updatePageAll newhdlmodst . set hoodleModeState newhdlmodst $ xstate))

-- | 

makeNewLayer :: MainCoroutine () 
makeNewLayer = layerAction newlayeraction >>= commit >> invalidateAll 
  where newlayeraction hdlmodst cpn page = do 
          let lyrzipper = view glayers page  
              emptylyr = emptyRLayer 
              nlyrzipper = appendGoLast lyrzipper emptylyr 
              npage = set glayers nlyrzipper page
          return . setPageMap (M.adjust (const npage) cpn . getPageMap $ hdlmodst) $ hdlmodst 
                

gotoNextLayer :: MainCoroutine ()
gotoNextLayer = layerAction nextlayeraction >>= put >> invalidateAll 
  where nextlayeraction hdlmodst cpn page = do 
          let lyrzipper = view glayers page  
              mlyrzipper = moveRight lyrzipper 
              npage = maybe page (\x-> set glayers x page) mlyrzipper
          return . setPageMap (M.adjust (const npage) cpn . getPageMap $ hdlmodst) $ hdlmodst  

gotoPrevLayer :: MainCoroutine ()
gotoPrevLayer = layerAction prevlayeraction >>= put >> invalidateAll 
  where prevlayeraction hdlmodst cpn page = do 
          let lyrzipper = view glayers page  
              mlyrzipper = moveLeft lyrzipper 
              npage = maybe page (\x -> set glayers x page) mlyrzipper
          return . setPageMap (M.adjust (const npage) cpn . getPageMap $ hdlmodst) $ hdlmodst  


gotoLayerAt :: Int -> MainCoroutine ()
gotoLayerAt n = layerAction gotoaction >>= put >> invalidateAll 
  where gotoaction hdlmodst cpn page = do 
          let lyrzipper = view glayers page  
              mlyrzipper = moveTo n lyrzipper 
              npage = maybe page (\x -> set glayers x page) mlyrzipper
          return . setPageMap (M.adjust (const npage) cpn . getPageMap $ hdlmodst) $ hdlmodst  


deleteCurrentLayer :: MainCoroutine ()
deleteCurrentLayer = layerAction deletelayeraction >>= commit >> invalidateAll 
  where deletelayeraction hdlmodst cpn page = do 
          let lyrzipper = view glayers page  
              mlyrzipper = deleteCurrent lyrzipper 
              npage = maybe page (\x -> set glayers x page) mlyrzipper
          return . setPageMap (M.adjust (const npage) cpn . getPageMap $ hdlmodst) $ hdlmodst  

startGotoLayerAt :: MainCoroutine ()
startGotoLayerAt = 
    forBoth' unboxBiAct fsingle . view currentCanvasInfo =<< get
  where 
    fsingle cvsInfo = do 
      xstate <- get 
      let hdlmodst = view hoodleModeState xstate
      let epage = getCurrentPageEitherFromHoodleModeState cvsInfo hdlmodst
          page = either id (hPage2RPage) epage 
          lyrzipper = view glayers page
          cidx = currIndex lyrzipper
          len  = lengthSZ lyrzipper 
      lref <- liftIO $ newIORef cidx
      dialog <- liftIO (layerChooseDialog lref cidx len)
      res <- liftIO $ dialogRun dialog
      case res of 
        ResponseDeleteEvent -> liftIO $ widgetDestroy dialog
        ResponseOk ->  do
          liftIO $ widgetDestroy dialog
          newnum <- liftIO (readIORef lref)
          -- liftIO $ putStrLn (show (newnum))
          gotoLayerAt newnum
        ResponseCancel -> liftIO $ widgetDestroy dialog
        _ -> error "??? in fileOpen " 
      return ()