{-# LANGUAGE ScopedTypeVariables #-}
{-
Copyright (C) 2008-2017 John MacFarlane <jgm@berkeley.edu>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-}

{- |
   Module      : Text.Pandoc.Writers.ODT
   Copyright   : Copyright (C) 2008-2017 John MacFarlane
   License     : GNU GPL, version 2 or above

   Maintainer  : John MacFarlane <jgm@berkeley.edu>
   Stability   : alpha
   Portability : portable

Conversion of 'Pandoc' documents to ODT.
-}
module Text.Pandoc.Writers.ODT ( writeODT ) where
import Codec.Archive.Zip
import Control.Monad.Except (catchError)
import Control.Monad.State.Strict
import qualified Data.ByteString.Lazy as B
import Data.Generics (everywhere', mkT)
import Data.List (isPrefixOf)
import Data.Maybe (fromMaybe)
import qualified Data.Text.Lazy as TL
import System.FilePath (takeDirectory, takeExtension, (<.>))
import Text.Pandoc.Class (PandocMonad, report)
import qualified Text.Pandoc.Class as P
import Text.Pandoc.Definition
import Text.Pandoc.ImageSize
import Text.Pandoc.Logging
import Text.Pandoc.MIME (extensionFromMimeType, getMimeType)
import Text.Pandoc.Options (WrapOption (..), WriterOptions (..))
import Text.Pandoc.Pretty
import Text.Pandoc.Shared (stringify)
import Text.Pandoc.UTF8 (fromStringLazy, fromTextLazy, toStringLazy)
import Text.Pandoc.Walk
import Text.Pandoc.Writers.OpenDocument (writeOpenDocument)
import Text.Pandoc.Writers.Shared (fixDisplayMath, getLang, Lang(..),
           renderLang)
import Text.Pandoc.XML
import Text.TeXMath
import Text.XML.Light

data ODTState = ODTState { stEntries :: [Entry]
                         }

type O m = StateT ODTState m

-- | Produce an ODT file from a Pandoc document.
writeODT :: PandocMonad m
         => WriterOptions  -- ^ Writer options
         -> Pandoc         -- ^ Document to convert
         -> m B.ByteString
writeODT  opts doc =
  let initState = ODTState{ stEntries = []
                          }
  in
    evalStateT (pandocToODT opts doc) initState

-- | Produce an ODT file from a Pandoc document.
pandocToODT :: PandocMonad m
            => WriterOptions  -- ^ Writer options
            -> Pandoc         -- ^ Document to convert
            -> O m B.ByteString
pandocToODT opts doc@(Pandoc meta _) = do
  let datadir = writerUserDataDir opts
  let title = docTitle meta
  lang <- getLang opts meta
  refArchive <-
       case writerReferenceDoc opts of
             Just f -> liftM toArchive $ lift $ P.readFileLazy f
             Nothing -> lift $ (toArchive . B.fromStrict) <$>
                                P.readDataFile datadir "reference.odt"
  -- handle formulas and pictures
  -- picEntriesRef <- P.newIORef ([] :: [Entry])
  doc' <- walkM (transformPicMath opts) $ walk fixDisplayMath doc
  newContents <- lift $ writeOpenDocument opts{writerWrapText = WrapNone} doc'
  epochtime <- floor `fmap` (lift P.getPOSIXTime)
  let contentEntry = toEntry "content.xml" epochtime
                     $ fromTextLazy $ TL.fromStrict newContents
  picEntries <- gets stEntries
  let archive = foldr addEntryToArchive refArchive
                $ contentEntry : picEntries
  -- construct META-INF/manifest.xml based on archive
  let toFileEntry fp = case getMimeType fp of
                        Nothing  -> empty
                        Just m   -> selfClosingTag "manifest:file-entry"
                                     [("manifest:media-type", m)
                                     ,("manifest:full-path", fp)
                                     ,("manifest:version", "1.2")
                                     ]
  let files = [ ent | ent <- filesInArchive archive,
                             not ("META-INF" `isPrefixOf` ent) ]
  let formulas = [ takeDirectory ent ++ "/" | ent <- filesInArchive archive,
                      "Formula-" `isPrefixOf` ent, takeExtension ent == ".xml" ]
  let manifestEntry = toEntry "META-INF/manifest.xml" epochtime
        $ fromStringLazy $ render Nothing
        $ text "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
        $$
         ( inTags True "manifest:manifest"
            [("xmlns:manifest","urn:oasis:names:tc:opendocument:xmlns:manifest:1.0")
            ,("manifest:version","1.2")]
            $ ( selfClosingTag "manifest:file-entry"
                 [("manifest:media-type","application/vnd.oasis.opendocument.text")
                 ,("manifest:full-path","/")]
                $$ vcat ( map toFileEntry $ files )
                $$ vcat ( map toFileEntry $ formulas )
              )
         )
  let archive' = addEntryToArchive manifestEntry archive
  let metaEntry = toEntry "meta.xml" epochtime
       $ fromStringLazy $ render Nothing
       $ text "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
       $$
        ( inTags True "office:document-meta"
           [("xmlns:office","urn:oasis:names:tc:opendocument:xmlns:office:1.0")
           ,("xmlns:xlink","http://www.w3.org/1999/xlink")
           ,("xmlns:dc","http://purl.org/dc/elements/1.1/")
           ,("xmlns:meta","urn:oasis:names:tc:opendocument:xmlns:meta:1.0")
           ,("xmlns:ooo","http://openoffice.org/2004/office")
           ,("xmlns:grddl","http://www.w3.org/2003/g/data-view#")
           ,("office:version","1.2")]
           $ ( inTagsSimple "office:meta" $
                 ( inTagsSimple "dc:title"
                      (text $ escapeStringForXML (stringify title))
                   $$
                   case lang of
                        Just l -> inTagsSimple "dc:language"
                                    (text (escapeStringForXML (renderLang l)))
                        Nothing -> empty
                 )
             )
        )
  -- make sure mimetype is first
  let mimetypeEntry = toEntry "mimetype" epochtime
                      $ fromStringLazy "application/vnd.oasis.opendocument.text"
  archive'' <- updateStyleWithLang lang
                  $ addEntryToArchive mimetypeEntry
                  $ addEntryToArchive metaEntry archive'
  return $ fromArchive archive''

updateStyleWithLang :: PandocMonad m => Maybe Lang -> Archive -> O m Archive
updateStyleWithLang Nothing arch = return arch
updateStyleWithLang (Just lang) arch = do
  epochtime <- floor `fmap` (lift P.getPOSIXTime)
  return arch{ zEntries = [if eRelativePath e == "styles.xml"
                              then case parseXMLDoc
                                      (toStringLazy (fromEntry e)) of
                                      Nothing -> e
                                      Just d ->
                                        toEntry "styles.xml" epochtime
                                        ( fromStringLazy
                                        . ppTopElement
                                        . addLang lang $ d )
                              else e
                            | e <- zEntries arch] }

addLang :: Lang -> Element -> Element
addLang lang = everywhere' (mkT updateLangAttr)
    where updateLangAttr (Attr n@(QName "language" _ (Just "fo")) _)
                           = Attr n (langLanguage lang)
          updateLangAttr (Attr n@(QName "country" _ (Just "fo")) _)
                           = Attr n (langRegion lang)
          updateLangAttr x = x

-- | transform both Image and Math elements
transformPicMath :: PandocMonad m => WriterOptions ->Inline -> O m Inline
transformPicMath opts (Image attr@(id', cls, _) lab (src,t)) = catchError
   (do (img, mbMimeType) <- P.fetchItem (writerSourceURL opts) src
       (ptX, ptY) <- case imageSize opts img of
                       Right s  -> return $ sizeInPoints s
                       Left msg -> do
                         report $ CouldNotDetermineImageSize src msg
                         return (100, 100)
       let dims =
             case (getDim Width, getDim Height) of
               (Just w, Just h)              -> [("width", show w), ("height", show h)]
               (Just w@(Percent p), Nothing) -> [("width", show w), ("height", show (p / ratio) ++ "%")]
               (Nothing, Just h@(Percent p)) -> [("width", show (p * ratio) ++ "%"), ("height", show h)]
               (Just w@(Inch i), Nothing)    -> [("width", show w), ("height", show (i / ratio) ++ "in")]
               (Nothing, Just h@(Inch i))    -> [("width", show (i * ratio) ++ "in"), ("height", show h)]
               _                             -> [("width", show ptX ++ "pt"), ("height", show ptY ++ "pt")]
             where
               ratio = ptX / ptY
               getDim dir = case (dimension dir attr) of
                              Just (Percent i) -> Just $ Percent i
                              Just dim         -> Just $ Inch $ inInch opts dim
                              Nothing          -> Nothing
       let  newattr = (id', cls, dims)
       entries <- gets stEntries
       let extension = fromMaybe (takeExtension $ takeWhile (/='?') src)
                           (mbMimeType >>= extensionFromMimeType)
       let newsrc = "Pictures/" ++ show (length entries) <.> extension
       let toLazy = B.fromChunks . (:[])
       epochtime <- floor `fmap` (lift P.getPOSIXTime)
       let entry = toEntry newsrc epochtime $ toLazy img
       modify $ \st -> st{ stEntries = entry : entries }
       return $ Image newattr lab (newsrc, t))
   (\e -> do
       report $ CouldNotFetchResource src (show e)
       return $ Emph lab)

transformPicMath _ (Math t math) = do
  entries <- gets stEntries
  let dt = if t == InlineMath then DisplayInline else DisplayBlock
  case writeMathML dt <$> readTeX math of
       Left  _ -> return $ Math t math
       Right r -> do
         let conf = useShortEmptyTags (const False) defaultConfigPP
         let mathml = ppcTopElement conf r
         epochtime <- floor `fmap` (lift $ P.getPOSIXTime)
         let dirname = "Formula-" ++ show (length entries) ++ "/"
         let fname = dirname ++ "content.xml"
         let entry = toEntry fname epochtime (fromStringLazy mathml)
         modify $ \st -> st{ stEntries = entry : entries }
         return $ RawInline (Format "opendocument") $ render Nothing $
           inTags False "draw:frame" [("text:anchor-type",
                                       if t == DisplayMath
                                          then "paragraph"
                                          else "as-char")
                                     ,("style:vertical-pos", "middle")
                                     ,("style:vertical-rel", "text")] $
             selfClosingTag "draw:object" [("xlink:href", dirname)
                                        , ("xlink:type", "simple")
                                        , ("xlink:show", "embed")
                                        , ("xlink:actuate", "onLoad")]

transformPicMath _ x = return x