{-# LANGUAGE OverloadedStrings, CPP, GADTs #-}

-----------------------------------------------------------------------------
-- |
-- Module      : Application.HXournal.ModelAction.File 
-- Copyright   : (c) 2011, 2012 Ian-Woo Kim
--
-- License     : BSD3
-- Maintainer  : Ian-Woo Kim <ianwookim@gmail.com>
-- Stability   : experimental
-- Portability : GHC
--
-----------------------------------------------------------------------------

module Application.HXournal.ModelAction.File where

import Application.HXournal.Type.XournalState
import Application.HXournal.Type.Canvas
import Application.HXournal.ModelAction.Page
import Application.HXournal.Type.PageArrangement
import Application.HXournal.Util
import Data.Xournal.BBox
import qualified Text.Xournal.Parse as P
import qualified Data.IntMap as M
import Data.Maybe 

import Control.Monad
import Control.Category
import Data.Label
import Prelude hiding ((.),id)

import Data.Xournal.Simple
import Data.Xournal.Generic

import Graphics.Xournal.Render.BBoxMapPDF
import Graphics.Xournal.Render.PDFBackground

import Graphics.UI.Gtk hiding (get,set)

import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as C

#ifdef POPPLER
import qualified Graphics.UI.Gtk.Poppler.Document as Poppler
import qualified Graphics.UI.Gtk.Poppler.Page as PopplerPage
#endif

-- | get file content from xournal file and update xournal state 

getFileContent :: Maybe FilePath 
               -> HXournalState 
               -> IO HXournalState 
getFileContent (Just fname) xstate = do 
    xojcontent <- P.read_xournal fname 
    nxstate <- constructNewHXournalStateFromXournal xojcontent xstate 
    return $ set currFileName (Just fname) nxstate 
getFileContent Nothing xstate = do   
    newxoj <- mkTXournalBBoxMapPDFBufFromNoBuf <=< mkTXournalBBoxMapPDF 
              $ defaultXournal 
    let newxojstate = ViewAppendState newxoj 
        xstate' = set currFileName Nothing 
                  . set xournalstate newxojstate
                  $ xstate 
    -- let dim = get g_dimension . maybeError "getFileContent" . M.lookup 0 . get g_pages 
    --         $ newxoj 

    -- let cvschange = setPage xstate' 0 
    -- modifyCurrCvsInfoM cvschange xstate'
    return xstate' 

-- |
    
constructNewHXournalStateFromXournal :: Xournal -> HXournalState -> IO HXournalState 
constructNewHXournalStateFromXournal xoj' xstate = do 
    xoj <- mkTXournalBBoxMapPDFBufFromNoBuf <=< mkTXournalBBoxMapPDF $ xoj'
    let dim = get g_dimension . maybeError "constructNewHxournalStateFromXournal" . M.lookup 0 
              . get g_pages $ xoj
        startingxojstate = ViewAppendState xoj
        -- forSingle = set (pageDimension.pageArrangement.viewInfo) (PageDimension dim)
        --             . set currentPageNum 0 
        
    return $ set xournalstate startingxojstate xstate
--        cvschange = setPage xstate' 0 
--    modifyCurrCvsInfoM  cvschange xstate' 
      
      -- rentCanvasInfo (selectBox forSingle (error "construct..."))
 --    return $ setPage xstate' 0 xstate'


-- | 

makeNewXojWithPDF :: FilePath -> IO (Maybe Xournal)
makeNewXojWithPDF fp = do 
#ifdef POPPLER
  let fname = C.pack fp 
  mdoc <- popplerGetDocFromFile fname
  case mdoc of 
    Nothing -> do 
      putStrLn $ "no such file " ++ fp 
      return Nothing 
    Just doc -> do 
      n <- Poppler.documentGetNPages doc 
      pg <- Poppler.documentGetPage doc 0 
      (w,h) <- PopplerPage.pageGetSize pg
      let dim = Dim w h 
          xoj = set s_title fname 
                . set s_pages (map (createPage dim fname) [1..n]) 
                $ emptyXournal
      return (Just xoj)
#else
  error "makeNewXojWithPDF should not be used without poppler lib"
#endif
      
      
createPage :: Dimension -> B.ByteString -> Int -> Page
createPage dim fn n 
  | n == 1 = let bkg = BackgroundPdf "pdf" (Just "absolute") (Just fn ) n 
             in  Page dim bkg [emptyLayer]
  | otherwise = let bkg = BackgroundPdf "pdf" Nothing Nothing n 
                in Page dim bkg [emptyLayer]
                   
                   
toggleSave :: UIManager -> Bool -> IO ()
toggleSave ui b = do 
    agr <- uiManagerGetActionGroups ui >>= \x -> 
      case x of
        [] -> error "No action group?"
        y:_ -> return y
    Just savea <- actionGroupGetAction agr "SAVEA"
    actionSetSensitive savea b