module Application.HXournal.Coroutine.File where

import Application.HXournal.Type.Event
import Application.HXournal.Type.Coroutine
import Application.HXournal.Type.XournalState
import Application.HXournal.Accessor
import Application.HXournal.ModelAction.File 
import Application.HXournal.Coroutine.Draw
import Application.HXournal.ModelAction.Window
import Application.HXournal.Builder 
import Control.Monad.Trans
import Control.Applicative
import Graphics.Xournal.Type.Map
import Graphics.Xournal.Type.Select
import Graphics.UI.Gtk hiding (get,set)
import Control.Category
import Data.Label
import Prelude hiding ((.),id)
import qualified Data.ByteString.Lazy as L

fileNew :: Iteratee MyEvent XournalStateIO ()
fileNew = do 
    liftIO $ putStrLn "fileNew called"
    xstate <- getSt 
    xstate' <- liftIO $ getFileContent Nothing xstate 
    putSt xstate' 
    liftIO $ setTitleFromFileName xstate'
    invalidateAll 

fileSave :: Iteratee MyEvent XournalStateIO () 
fileSave = do 
    xstate <- getSt 
    case get currFileName xstate of
      Nothing -> fileSaveAs 
      Just filename -> do     
        let xojstate = get xournalstate xstate
        let xoj = case xojstate of 
                    ViewAppendState xojmap -> xournalFromXournalBBoxMap xojmap 
                    SelectState txoj -> xournalFromXournalBBoxMap 
                                        $ XournalBBoxMap <$> tx_pages $ txoj 
        liftIO . L.writeFile filename . builder $ xoj

fileOpen :: Iteratee MyEvent XournalStateIO ()
fileOpen = do 
    liftIO $ putStrLn "file open clicked"
    dialog <- liftIO $ fileChooserDialogNew Nothing Nothing 
                                            FileChooserActionOpen 
                                            [ ("OK", ResponseOk) 
                                            , ("Cancel", ResponseCancel) ]
    res <- liftIO $ dialogRun dialog
    -- liftIO $ putStrLn $ show res
    case res of 
      ResponseDeleteEvent -> liftIO $ widgetDestroy dialog
      ResponseOk ->  do
        mfilename <- liftIO $ fileChooserGetFilename dialog 
        case mfilename of 
          Nothing -> return () 
          Just filename -> do 
            liftIO $ putStrLn $ show filename 
            xstate <- getSt 
            xstateNew <- liftIO $ getFileContent (Just filename) xstate
            putSt xstateNew 
            liftIO $ setTitleFromFileName xstateNew             
            invalidateAll 
        liftIO $ widgetDestroy dialog
      ResponseCancel -> liftIO $ widgetDestroy dialog
      _ -> error "??? in fileOpen " 
    return ()

fileSaveAs :: Iteratee MyEvent XournalStateIO ()
fileSaveAs = do 
    liftIO $ putStrLn "file save as clicked"
    dialog <- liftIO $ fileChooserDialogNew Nothing Nothing 
                                            FileChooserActionSave 
                                            [ ("OK", ResponseOk) 
                                            , ("Cancel", ResponseCancel) ]
    res <- liftIO $ dialogRun dialog
    -- liftIO $ putStrLn $ show response
    case res of 
      ResponseDeleteEvent -> liftIO $ widgetDestroy dialog
      ResponseOk -> do
        mfilename <- liftIO $ fileChooserGetFilename dialog 
        case mfilename of 
          Nothing -> return () 
          Just filename -> do 
            liftIO $ putStrLn $ show filename 
            xstate <- getSt 
            let xstateNew = set currFileName (Just filename) xstate 
            let xojstate = get xournalstate xstateNew
            let xoj = case xojstate of 
                        ViewAppendState xojmap -> xournalFromXournalBBoxMap xojmap 
                        SelectState txoj -> xournalFromXournalBBoxMap 
                                            $ XournalBBoxMap <$> tx_pages $ txoj 
            liftIO . L.writeFile filename . builder $ xoj
            putSt xstateNew                                     
            liftIO $ setTitleFromFileName xstateNew 
        liftIO $ widgetDestroy dialog
      ResponseCancel -> liftIO $ widgetDestroy dialog
      _ -> error "??? in fileSaveAs"
    return ()