    {-# LANGUAGE NoImplicitPrelude #-}
    {-# LANGUAGE FlexibleContexts  #-}
    {-# LANGUAGE OverloadedStrings #-}
    {-# LANGUAGE PatternGuards     #-}
    {-
    Copyright (C) 2008-2018 Andrea Rossato <andrea.rossato@ing.unitn.it>
                            and John MacFarlane.

    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.OpenDocument
       Copyright   : Copyright (C) 2008-2018 Andrea Rossato and John MacFarlane
       License     : GNU GPL, version 2 or above

       Maintainer  : Andrea Rossato <andrea.rossato@ing.unitn.it>
       Stability   : alpha
       Portability : portable

    Conversion of 'Pandoc' documents to OpenDocument XML.
    -}
    module Text.Pandoc.Writers.OpenDocument ( writeOpenDocument ) where
    import Prelude
    import Control.Arrow ((***), (>>>))
    import Control.Monad.State.Strict hiding (when)
    import Data.Char (chr)
    import Data.List (sortBy)
    import qualified Data.Map as Map
    import Data.Maybe (fromMaybe)
    import Data.Ord (comparing)
    import qualified Data.Set as Set
    import Data.Text (Text)
    import Text.Pandoc.BCP47 (Lang (..), parseBCP47)
    import Text.Pandoc.Class (PandocMonad, report, translateTerm,
                              setTranslations, toLang)
    import Text.Pandoc.Definition
    import Text.Pandoc.Logging
    import Text.Pandoc.Options
    import Text.Pandoc.Pretty
    import Text.Pandoc.Shared (linesToPara)
    import Text.Pandoc.Templates (renderTemplate')
    import qualified Text.Pandoc.Translations as Term (Term(Figure, Table))
    import Text.Pandoc.Writers.Math
    import Text.Pandoc.Writers.Shared
    import Text.Pandoc.XML
    import Text.Printf (printf)

    -- | Auxiliary function to convert Plain block to Para.
    plainToPara :: Block -> Block
    plainToPara (Plain x) = Para x
    plainToPara x         = x

    --
    -- OpenDocument writer
    --

    type OD m = StateT WriterState m

    data WriterState =
        WriterState { stNotes          :: [Doc]
                    , stTableStyles    :: [Doc]
                    , stParaStyles     :: [Doc]
                    , stListStyles     :: [(Int, [Doc])]
                    , stTextStyles     :: Map.Map (Set.Set TextStyle) (String, Doc)
                    , stTextStyleAttr  :: Set.Set TextStyle
                    , stIndentPara     :: Int
                    , stInDefinition   :: Bool
                    , stTight          :: Bool
                    , stFirstPara      :: Bool
                    , stImageId        :: Int
                    , stTableCaptionId :: Int
                    , stImageCaptionId :: Int
                    }

    defaultWriterState :: WriterState
    defaultWriterState =
        WriterState { stNotes          = []
                    , stTableStyles    = []
                    , stParaStyles     = []
                    , stListStyles     = []
                    , stTextStyles     = Map.empty
                    , stTextStyleAttr  = Set.empty
                    , stIndentPara     = 0
                    , stInDefinition   = False
                    , stTight          = False
                    , stFirstPara      = False
                    , stImageId        = 1
                    , stTableCaptionId = 1
                    , stImageCaptionId = 1
                    }

    when :: Bool -> Doc -> Doc
    when p a = if p then a else empty

    addTableStyle :: PandocMonad m => Doc -> OD m ()
    addTableStyle i = modify $ \s -> s { stTableStyles = i : stTableStyles s }

    addNote :: PandocMonad m => Doc -> OD m ()
    addNote i = modify $ \s -> s { stNotes = i : stNotes s }

    addParaStyle :: PandocMonad m => Doc -> OD m ()
    addParaStyle i = modify $ \s -> s { stParaStyles = i : stParaStyles s }

    addTextStyle :: PandocMonad m => Set.Set TextStyle -> (String, Doc) -> OD m ()
    addTextStyle attrs i = modify $ \s ->
      s { stTextStyles = Map.insert attrs i (stTextStyles s) }

    addTextStyleAttr :: PandocMonad m => TextStyle -> OD m ()
    addTextStyleAttr t = modify $ \s ->
      s { stTextStyleAttr = Set.insert t (stTextStyleAttr s) }

    increaseIndent :: PandocMonad m => OD m ()
    increaseIndent = modify $ \s -> s { stIndentPara = 1 + stIndentPara s }

    resetIndent :: PandocMonad m => OD m ()
    resetIndent = modify $ \s -> s { stIndentPara = stIndentPara s - 1 }

    inTightList :: PandocMonad m => OD m a -> OD m a
    inTightList  f = modify (\s -> s { stTight = True  }) >> f >>= \r ->
                     modify (\s -> s { stTight = False }) >> return r

    setInDefinitionList :: PandocMonad m => Bool -> OD m ()
    setInDefinitionList b = modify $  \s -> s { stInDefinition = b }

    setFirstPara :: PandocMonad m => OD m ()
    setFirstPara =  modify $  \s -> s { stFirstPara = True }

    inParagraphTags :: PandocMonad m => Doc -> OD m Doc
    inParagraphTags d = do
      b <- gets stFirstPara
      a <- if b
           then do modify $ \st -> st { stFirstPara = False }
                   return [("text:style-name", "First_20_paragraph")]
           else    return   [("text:style-name", "Text_20_body")]
      return $ inTags False "text:p" a d

    inParagraphTagsWithStyle :: String -> Doc -> Doc
    inParagraphTagsWithStyle sty = inTags False "text:p" [("text:style-name", sty)]

    inSpanTags :: String -> Doc -> Doc
    inSpanTags s = inTags False "text:span" [("text:style-name",s)]

    withTextStyle :: PandocMonad m => TextStyle -> OD m a -> OD m a
    withTextStyle s f = do
      oldTextStyleAttr <- gets stTextStyleAttr
      addTextStyleAttr s
      res <- f
      modify $ \st -> st{ stTextStyleAttr = oldTextStyleAttr }
      return res

    inTextStyle :: PandocMonad m => Doc -> OD m Doc
    inTextStyle d = do
      at <- gets stTextStyleAttr
      if Set.null at
         then return d
         else do
           styles <- gets stTextStyles
           case Map.lookup at styles of
                Just (styleName, _) -> return $
                  inTags False "text:span" [("text:style-name",styleName)] d
                Nothing -> do
                  let styleName = "T" ++ show (Map.size styles + 1)
                  addTextStyle at (styleName,
                         inTags False "style:style"
                           [("style:name", styleName)
                           ,("style:family", "text")]
                           $ selfClosingTag "style:text-properties"
                              (concatMap textStyleAttr (Set.toList at)))
                  return $ inTags False
                      "text:span" [("text:style-name",styleName)] d

    formulaStyles :: [Doc]
    formulaStyles = [formulaStyle InlineMath, formulaStyle DisplayMath]

    formulaStyle :: MathType -> Doc
    formulaStyle mt = inTags False "style:style"
      [("style:name", if mt == InlineMath then "fr1" else "fr2")
      ,("style:family", "graphic")
      ,("style:parent-style-name", "Formula")]
      $ selfClosingTag "style:graphic-properties" $ if mt == InlineMath then
                                                      [("style:vertical-pos", "middle")
                                                      ,("style:vertical-rel", "text")]
                                                    else
                                                      [("style:vertical-pos",   "middle")
                                                      ,("style:vertical-rel",   "paragraph-content")
                                                      ,("style:horizontal-pos", "center")
                                                      ,("style:horizontal-rel", "paragraph-content")
                                                      ,("style:wrap",           "none")]

    inHeaderTags :: PandocMonad m => Int -> String -> Doc -> OD m Doc
    inHeaderTags i ident d =
      return $ inTags False "text:h" [ ("text:style-name", "Heading_20_" ++ show i)
                                     , ("text:outline-level", show i)]
             $ if null ident
                  then d
                  else selfClosingTag "text:bookmark-start" [ ("text:name", ident) ]
                       <> d <>
                       selfClosingTag "text:bookmark-end" [ ("text:name", ident) ]

    inQuotes :: QuoteType -> Doc -> Doc
    inQuotes SingleQuote s = char '\8216' <> s <> char '\8217'
    inQuotes DoubleQuote s = char '\8220' <> s <> char '\8221'

    handleSpaces :: String -> Doc
    handleSpaces s
        | ( ' ':_) <- s = genTag s
        | ('\t':x) <- s = selfClosingTag "text:tab" [] <> rm x
        | otherwise     = rm s
        where
            genTag       = span (==' ') >>> tag . length *** rm >>> uncurry (<>)
            tag n        = when (n /= 0) $ selfClosingTag "text:s" [("text:c", show n)]
            rm ( ' ':xs) = char ' ' <> genTag xs
            rm ('\t':xs) = selfClosingTag "text:tab" [] <> genTag xs
            rm (   x:xs) = char  x  <> rm xs
            rm        [] = empty

    -- | Convert Pandoc document to string in OpenDocument format.
    writeOpenDocument :: PandocMonad m => WriterOptions -> Pandoc -> m Text
    writeOpenDocument opts (Pandoc meta blocks) = do
      let defLang = Lang "en" "US" "" []
      lang <- case lookupMetaString "lang" meta of
                "" -> pure defLang
                s  -> fromMaybe defLang <$> toLang (Just s)
      setTranslations lang
      let colwidth = if writerWrapText opts == WrapAuto
                        then Just $ writerColumns opts
                        else Nothing
      let render' :: Doc -> Text
          render' = render colwidth
      ((body, metadata),s) <- flip runStateT
            defaultWriterState $ do
               m <- metaToJSON opts
                      (fmap render' . blocksToOpenDocument opts)
                      (fmap render' . inlinesToOpenDocument opts)
                      meta
               b <- render' `fmap` blocksToOpenDocument opts blocks
               return (b, m)
      let styles   = stTableStyles s ++ stParaStyles s ++ formulaStyles ++
                         map snd (sortBy (flip (comparing fst)) (
                            Map.elems (stTextStyles s)))
          listStyle (n,l) = inTags True "text:list-style"
                              [("style:name", "L" ++ show n)] (vcat l)
      let listStyles  = map listStyle (stListStyles s)
      let automaticStyles = vcat $ reverse $ styles ++ listStyles
      let context = defField "body" body
                  $ defField "toc" (writerTableOfContents opts)
                  $defField "automatic-styles" (render' automaticStyles) metadata
      case writerTemplate opts of
           Nothing  -> return body
           Just tpl -> renderTemplate' tpl context

    withParagraphStyle :: PandocMonad m
                       => WriterOptions -> String -> [Block] -> OD m Doc
    withParagraphStyle  o s (b:bs)
        | Para l <- b = go =<< inParagraphTagsWithStyle s <$> inlinesToOpenDocument o l
        | otherwise   = go =<< blockToOpenDocument o b
        where go i = (<>) i <$>  withParagraphStyle o s bs
    withParagraphStyle _ _ [] = return empty

    inPreformattedTags :: PandocMonad m => String -> OD m Doc
    inPreformattedTags s = do
      n <- paraStyle [("style:parent-style-name","Preformatted_20_Text")]
      return . inParagraphTagsWithStyle ("P" ++ show n) . handleSpaces $ s

    orderedListToOpenDocument :: PandocMonad m
                              => WriterOptions -> Int -> [[Block]] -> OD m Doc
    orderedListToOpenDocument o pn bs =
        vcat . map (inTagsIndented "text:list-item") <$>
        mapM (orderedItemToOpenDocument o pn . map plainToPara) bs

    orderedItemToOpenDocument :: PandocMonad m
                              => WriterOptions -> Int -> [Block] -> OD m Doc
    orderedItemToOpenDocument  o n bs = vcat <$> mapM go bs
     where go (OrderedList a l) = newLevel a l
           go (Para          l) = inParagraphTagsWithStyle ("P" ++ show n) <$>
                                    inlinesToOpenDocument o l
           go b                 = blockToOpenDocument o b
           newLevel a l = do
             nn <- length <$> gets stParaStyles
             ls <- head   <$> gets stListStyles
             modify $ \s -> s { stListStyles = orderedListLevelStyle a ls :
                                     drop 1 (stListStyles s) }
             inTagsIndented "text:list" <$> orderedListToOpenDocument o nn l

    isTightList :: [[Block]] -> Bool
    isTightList []          = False
    isTightList (b:_)
        | Plain {} : _ <- b = True
        | otherwise         = False

    newOrderedListStyle :: PandocMonad m
                        => Bool -> ListAttributes -> OD m (Int,Int)
    newOrderedListStyle b a = do
      ln <- (+) 1 . length  <$> gets stListStyles
      let nbs = orderedListLevelStyle a (ln, [])
      pn <- if b then inTightList (paraListStyle ln) else paraListStyle ln
      modify $ \s -> s { stListStyles = nbs : stListStyles s }
      return (ln,pn)

    bulletListToOpenDocument :: PandocMonad m
                             => WriterOptions -> [[Block]] -> OD m Doc
    bulletListToOpenDocument o b = do
      ln <- (+) 1 . length <$> gets stListStyles
      (pn,ns) <- if isTightList b then inTightList (bulletListStyle ln) else bulletListStyle ln
      modify $ \s -> s { stListStyles = ns : stListStyles s }
      is <- listItemsToOpenDocument ("P" ++ show pn) o b
      return $ inTags True "text:list" [("text:style-name", "L" ++ show ln)] is

    listItemsToOpenDocument :: PandocMonad m
                            => String -> WriterOptions -> [[Block]] -> OD m Doc
    listItemsToOpenDocument s o is =
        vcat . map (inTagsIndented "text:list-item") <$> mapM (withParagraphStyle o s . map plainToPara) is

    deflistItemToOpenDocument :: PandocMonad m
                              => WriterOptions -> ([Inline],[[Block]]) -> OD m Doc
    deflistItemToOpenDocument o (t,d) = do
      let ts = if isTightList d
               then "Definition_20_Term_20_Tight"       else "Definition_20_Term"
          ds = if isTightList d
               then "Definition_20_Definition_20_Tight" else "Definition_20_Definition"
      t' <- withParagraphStyle o ts [Para t]
      d' <- liftM vcat $ mapM (withParagraphStyle o ds . map plainToPara) d
      return $ t' $$ d'

    inBlockQuote :: PandocMonad m
                 => WriterOptions -> Int -> [Block] -> OD m Doc
    inBlockQuote  o i (b:bs)
        | BlockQuote l <- b = do increaseIndent
                                 ni <- paraStyle
                                       [("style:parent-style-name","Quotations")]
                                 go =<< inBlockQuote o ni (map plainToPara l)
        | Para       l <- b = go =<< inParagraphTagsWithStyle ("P" ++ show  i) <$> inlinesToOpenDocument o l
        | otherwise         = go =<< blockToOpenDocument o b
        where go  block  = ($$) block <$> inBlockQuote o i bs
    inBlockQuote     _ _ [] =  resetIndent >> return empty

    -- | Convert a list of Pandoc blocks to OpenDocument.
    blocksToOpenDocument :: PandocMonad m => WriterOptions -> [Block] -> OD m Doc
    blocksToOpenDocument o b = vcat <$> mapM (blockToOpenDocument o) b

    -- | Convert a Pandoc block element to OpenDocument.
    blockToOpenDocument :: PandocMonad m => WriterOptions -> Block -> OD m Doc
    blockToOpenDocument o bs
        | Plain          b <- bs = if null b
                                      then return empty
                                      else inParagraphTags =<< inlinesToOpenDocument o b
        | Para [Image attr c (s,'f':'i':'g':':':t)] <- bs
                                 = figure attr c s t
        | Para           b <- bs = if null b &&
                                        not (isEnabled Ext_empty_paragraphs o)
                                      then return empty
                                      else inParagraphTags =<< inlinesToOpenDocument o b
        | LineBlock      b <- bs = blockToOpenDocument o $ linesToPara b
        | Div attr xs      <- bs = withLangFromAttr attr
                                      (blocksToOpenDocument o xs)
        | Header     i (ident,_,_) b
                           <- bs = setFirstPara >> (inHeaderTags i ident
                                      =<< inlinesToOpenDocument o b)
        | BlockQuote     b <- bs = setFirstPara >> mkBlockQuote b
        | DefinitionList b <- bs = setFirstPara >> defList b
        | BulletList     b <- bs = setFirstPara >> bulletListToOpenDocument o b
        | OrderedList  a b <- bs = setFirstPara >> orderedList a b
        | CodeBlock    _ s <- bs = setFirstPara >> preformatted s
        | Table  c a w h r <- bs = setFirstPara >> table c a w h r
        | HorizontalRule   <- bs = setFirstPara >> return (selfClosingTag "text:p"
                                    [ ("text:style-name", "Horizontal_20_Line") ])
        | RawBlock f     s <- bs = if f == Format "opendocument"
                                      then return $ text s
                                      else do
                                        report $ BlockNotRendered bs
                                        return empty
        | Null             <- bs = return empty
        | otherwise              = return empty
        where
          defList       b = do setInDefinitionList True
                               r <- vcat  <$> mapM (deflistItemToOpenDocument o) b
                               setInDefinitionList False
                               return r
          preformatted  s = (flush . vcat) <$> mapM (inPreformattedTags . escapeStringForXML) (lines s)
          mkBlockQuote  b = do increaseIndent
                               i <- paraStyle
                                     [("style:parent-style-name","Quotations")]
                               inBlockQuote o i (map plainToPara b)
          orderedList a b = do (ln,pn) <- newOrderedListStyle (isTightList b) a
                               inTags True "text:list" [ ("text:style-name", "L" ++ show ln)]
                                          <$> orderedListToOpenDocument o pn b
          table c a w h r = do
            tn <- length <$> gets stTableStyles
            pn <- length <$> gets stParaStyles
            let  genIds      = map chr [65..]
                 name        = "Table" ++ show (tn + 1)
                 columnIds   = zip genIds w
                 mkColumn  n = selfClosingTag "table:table-column" [("table:style-name", name ++ "." ++ [fst n])]
                 columns     = map mkColumn columnIds
                 paraHStyles = paraTableStyles "Heading"  pn a
                 paraStyles  = paraTableStyles "Contents" (pn + length (newPara paraHStyles)) a
                 newPara     = map snd . filter (not . isEmpty . snd)
            addTableStyle $ tableStyle tn columnIds
            mapM_ addParaStyle . newPara $ paraHStyles ++ paraStyles
            captionDoc <- if null c
                          then return empty
                          else inlinesToOpenDocument o c >>= numberedTableCaption
            th <- if all null h
                     then return empty
                     else colHeadsToOpenDocument o (map fst paraHStyles) h
            tr <- mapM (tableRowToOpenDocument o (map fst paraStyles)) r
            return $ inTags True "table:table" [ ("table:name"      , name)
                                               , ("table:style-name", name)
                                               ] (vcat columns $$ th $$ vcat tr) $$ captionDoc
          figure attr caption source title | null caption =
            withParagraphStyle o "Figure" [Para [Image attr caption (source,title)]]
                                      | otherwise    = do
            imageDoc <- withParagraphStyle o "FigureWithCaption" [Para [Image attr caption (source,title)]]
            captionDoc <- inlinesToOpenDocument o caption >>= numberedFigureCaption
            return $ imageDoc $$ captionDoc

    numberedTableCaption :: PandocMonad m => Doc -> OD m Doc
    numberedTableCaption caption = do
        id' <- gets stTableCaptionId
        modify (\st -> st{ stTableCaptionId = id' + 1 })
        capterm <- translateTerm Term.Table
        return $ numberedCaption "Table" capterm "Table" id' caption

    numberedFigureCaption :: PandocMonad m => Doc -> OD m Doc
    numberedFigureCaption caption = do
        id' <- gets stImageCaptionId
        modify (\st -> st{ stImageCaptionId = id' + 1 })
        capterm <- translateTerm Term.Figure
        return $ numberedCaption "FigureCaption" capterm "Illustration" id' caption

    numberedCaption :: String -> String -> String -> Int -> Doc -> Doc
    numberedCaption style term name num caption =
        let t = text term
            r = num - 1
            s = inTags False "text:sequence" [ ("text:ref-name", "ref" ++ name ++ show r),
                                               ("text:name", name),
                                               ("text:formula", "ooow:" ++ name ++ "+1"),
                                               ("style:num-format", "1") ] $ text $ show num
            c = text ": "
        in inParagraphTagsWithStyle style $ hcat [ t, text " ", s, c, caption ]

    colHeadsToOpenDocument :: PandocMonad m
                           => WriterOptions -> [String] -> [[Block]]
                           -> OD m Doc
    colHeadsToOpenDocument o ns hs =
        inTagsIndented "table:table-header-rows" . inTagsIndented "table:table-row" . vcat <$>
        mapM (tableItemToOpenDocument o "TableHeaderRowCell") (zip ns hs)

    tableRowToOpenDocument :: PandocMonad m
                           => WriterOptions -> [String] -> [[Block]]
                           -> OD m Doc
    tableRowToOpenDocument o ns cs =
        inTagsIndented "table:table-row" . vcat <$>
        mapM (tableItemToOpenDocument o "TableRowCell") (zip ns cs)

    tableItemToOpenDocument :: PandocMonad m
                            => WriterOptions -> String -> (String,[Block])
                            -> OD m Doc
    tableItemToOpenDocument o s (n,i) =
      let a = [ ("table:style-name" , s )
              , ("office:value-type", "string"     )
              ]
      in  inTags True "table:table-cell" a <$>
          withParagraphStyle o n (map plainToPara i)

    -- | Convert a list of inline elements to OpenDocument.
    inlinesToOpenDocument :: PandocMonad m => WriterOptions -> [Inline] -> OD m Doc
    inlinesToOpenDocument o l = hcat <$> toChunks o l

    toChunks :: PandocMonad m => WriterOptions -> [Inline] -> OD m [Doc]
    toChunks _ [] = return []
    toChunks o (x : xs)
      | isChunkable x = do
            contents <- (inTextStyle . hcat) =<<
                         mapM (inlineToOpenDocument o) (x:ys)
            rest <- toChunks o zs
            return (contents : rest)
      | otherwise     = do
            contents <- inlineToOpenDocument o x
            rest <- toChunks o xs
            return (contents : rest)
      where (ys, zs) = span isChunkable xs

    isChunkable :: Inline -> Bool
    isChunkable (Str _)   = True
    isChunkable Space     = True
    isChunkable SoftBreak = True
    isChunkable _         = False

    -- | Convert an inline element to OpenDocument.
    inlineToOpenDocument :: PandocMonad m => WriterOptions -> Inline -> OD m Doc
    inlineToOpenDocument o ils
      = case ils of
        Space         -> return space
        SoftBreak
         | writerWrapText o == WrapPreserve
                      -> return $ preformatted "\n"
         | otherwise  ->return space
        Span attr xs  -> withLangFromAttr attr (inlinesToOpenDocument o xs)
        LineBreak     -> return $ selfClosingTag "text:line-break" []
        Str         s -> return $ handleSpaces $ escapeStringForXML s
        Emph        l -> withTextStyle Italic $ inlinesToOpenDocument o l
        Strong      l -> withTextStyle Bold   $ inlinesToOpenDocument o l
        Strikeout   l -> withTextStyle Strike $ inlinesToOpenDocument o l
        Superscript l -> withTextStyle Sup    $ inlinesToOpenDocument o l
        Subscript   l -> withTextStyle Sub    $ inlinesToOpenDocument o l
        SmallCaps   l -> withTextStyle SmallC $ inlinesToOpenDocument o l
        Quoted    t l -> inQuotes t <$> inlinesToOpenDocument o l
        Code      _ s -> inlinedCode $ preformatted s
        Math      t s -> lift (texMathToInlines t s) >>=
                             inlinesToOpenDocument o
        Cite      _ l -> inlinesToOpenDocument o l
        RawInline f s -> if f == Format "opendocument"
                           then return $ text s
                           else do
                             report $ InlineNotRendered ils
                             return empty
        Link _ l (s,t) ->  mkLink s t <$> inlinesToOpenDocument o l
        Image attr _ (s,t) -> mkImg attr s t
        Note        l  -> mkNote l
        where
          preformatted s = handleSpaces $ escapeStringForXML s
          inlinedCode s = return $ inTags False "text:span" [("text:style-name", "Source_Text")] s
          mkLink   s t = inTags False "text:a" [ ("xlink:type" , "simple")
                                               , ("xlink:href" , s       )
                                               , ("office:name", t       )
                                               ] . inSpanTags "Definition"
          mkImg (_, _, kvs) s _ = do
                   id' <- gets stImageId
                   modify (\st -> st{ stImageId = id' + 1 })
                   let getDims [] = []
                       getDims (("width", w) :xs) = ("svg:width", w)  : getDims xs
                       getDims (("rel-width", w):xs) = ("style:rel-width", w) : getDims xs
                       getDims (("height", h):xs) = ("svg:height", h) : getDims xs
                       getDims (("rel-height", w):xs) = ("style:rel-height", w) : getDims xs
                       getDims (_:xs) =                             getDims xs
                   return $ inTags False "draw:frame"
                            (("draw:name", "img" ++ show id') : getDims kvs) $
                         selfClosingTag "draw:image" [ ("xlink:href"   , s       )
                                                     , ("xlink:type"   , "simple")
                                                     , ("xlink:show"   , "embed" )
                                                     , ("xlink:actuate", "onLoad")]
          mkNote     l = do
            n <- length <$> gets stNotes
            let footNote t = inTags False "text:note"
                             [ ("text:id"        , "ftn" ++ show n)
                             , ("text:note-class", "footnote"     )] $
                             inTagsSimple "text:note-citation" (text . show $ n + 1) <>
                             inTagsSimple "text:note-body" t
            nn <- footNote <$> withParagraphStyle o "Footnote" l
            addNote nn
            return nn

    bulletListStyle :: PandocMonad m => Int -> OD m (Int,(Int,[Doc]))
    bulletListStyle l = do
      let doStyles  i = inTags True "text:list-level-style-bullet"
                        [ ("text:level"      , show (i + 1)       )
                        , ("text:style-name" , "Bullet_20_Symbols")
                        , ("style:num-suffix", "."                )
                        , ("text:bullet-char", [bulletList !! i]  )
                        ] (listLevelStyle (1 + i))
          bulletList  = map chr $ cycle [8226,9702,9642]
          listElStyle = map doStyles [0..9]
      pn <- paraListStyle l
      return (pn, (l, listElStyle))

    orderedListLevelStyle :: ListAttributes -> (Int, [Doc]) -> (Int,[Doc])
    orderedListLevelStyle (s,n, d) (l,ls) =
        let suffix    = case d of
                          OneParen  -> [("style:num-suffix", ")")]
                          TwoParens -> [("style:num-prefix", "(")
                                       ,("style:num-suffix", ")")]
                          _         -> [("style:num-suffix", ".")]
            format    = case n of
                          UpperAlpha -> "A"
                          LowerAlpha -> "a"
                          UpperRoman -> "I"
                          LowerRoman -> "i"
                          _          -> "1"
            listStyle = inTags True "text:list-level-style-number"
                        ([ ("text:level"      , show $ 1 + length ls  )
                         , ("text:style-name" , "Numbering_20_Symbols")
                         , ("style:num-format", format                )
                         , ("text:start-value", show s                )
                         ] ++ suffix) (listLevelStyle (1 + length ls))
        in  (l, ls ++ [listStyle])

    listLevelStyle :: Int -> Doc
    listLevelStyle i =
        let indent = show (0.25 + (0.25 * fromIntegral i :: Double)) in
        inTags True "style:list-level-properties"
                           [ ("text:list-level-position-and-space-mode",
                              "label-alignment")
                           , ("fo:text-align", "right")
                           ] $
           selfClosingTag "style:list-level-label-alignment"
                          [ ("text:label-followed-by", "listtab")
                          , ("text:list-tab-stop-position", indent ++ "in")
                          , ("fo:text-indent", "-0.25in")
                          , ("fo:margin-left", indent ++ "in")
                          ]

    tableStyle :: Int -> [(Char,Double)] -> Doc
    tableStyle num wcs =
        let tableId        = "Table" ++ show (num + 1)
            table          = inTags True "style:style"
                             [("style:name", tableId)
                             ,("style:family", "table")] $
                             selfClosingTag "style:table-properties"
                             [("table:align"    , "center")]
            colStyle (c,0) = selfClosingTag "style:style"
                             [ ("style:name"  , tableId ++ "." ++ [c])
                             , ("style:family", "table-column"       )]
            colStyle (c,w) = inTags True "style:style"
                             [ ("style:name"  , tableId ++ "." ++ [c])
                             , ("style:family", "table-column"       )] $
                             selfClosingTag "style:table-column-properties"
                             [("style:rel-column-width", printf "%d*" (floor $ w * 65535 :: Integer))]
            headerRowCellStyle = inTags True "style:style"
                             [ ("style:name"  , "TableHeaderRowCell")
                             , ("style:family", "table-cell"    )] $
                             selfClosingTag "style:table-cell-properties"
                             [ ("fo:border", "none")]
            rowCellStyle = inTags True "style:style"
                             [ ("style:name"  , "TableRowCell")
                             , ("style:family", "table-cell"    )] $
                             selfClosingTag "style:table-cell-properties"
                             [ ("fo:border", "none")]
            cellStyles = if num == 0
                         then headerRowCellStyle $$ rowCellStyle
                         else empty
            columnStyles   = map colStyle wcs
        in cellStyles $$ table $$ vcat columnStyles

    paraStyle :: PandocMonad m => [(String,String)] -> OD m Int
    paraStyle attrs = do
      pn <- (+)   1 . length       <$> gets stParaStyles
      i  <- (*) (0.5 :: Double) . fromIntegral <$> gets stIndentPara
      b  <- gets stInDefinition
      t  <- gets stTight
      let styleAttr = [ ("style:name"             , "P" ++ show pn)
                      , ("style:family"           , "paragraph"   )]
          indentVal = flip (++) "in" . show $ if b then max 0.5 i else i
          tight     = if t then [ ("fo:margin-top"          , "0in"    )
                                , ("fo:margin-bottom"       , "0in"    )]
                           else []
          indent    = if i /= 0 || b
                          then [ ("fo:margin-left"         , indentVal)
                               , ("fo:margin-right"        , "0in"    )
                               , ("fo:text-indent"         , "0in"    )
                               , ("style:auto-text-indent" , "false"  )]
                          else []
          attributes = indent ++ tight
          paraProps = if null attributes
                         then mempty
                         else selfClosingTag
                                 "style:paragraph-properties" attributes
      addParaStyle $ inTags True "style:style" (styleAttr ++ attrs) paraProps
      return pn

    paraListStyle :: PandocMonad m => Int -> OD m Int
    paraListStyle l = paraStyle
      [("style:parent-style-name","Text_20_body")
      ,("style:list-style-name", "L" ++ show l )]

    paraTableStyles :: String -> Int -> [Alignment] -> [(String, Doc)]
    paraTableStyles _ _ [] = []
    paraTableStyles t s (a:xs)
        | AlignRight  <- a = (         pName s, res s "end"   ) : paraTableStyles t (s + 1) xs
        | AlignCenter <- a = (         pName s, res s "center") : paraTableStyles t (s + 1) xs
        | otherwise        = ("Table_20_" ++ t, empty         ) : paraTableStyles t  s      xs
        where pName sn = "P" ++ show (sn + 1)
              res sn x = inTags True "style:style"
                         [ ("style:name"             , pName sn        )
                         , ("style:family"           , "paragraph"     )
                         , ("style:parent-style-name", "Table_20_" ++ t)] $
                         selfClosingTag "style:paragraph-properties"
                         [ ("fo:text-align", x)
                         , ("style:justify-single-word", "false")]

    data TextStyle = Italic
                   | Bold
                   | Strike
                   | Sub
                   | Sup
                   | SmallC
                   | Pre
                   | Language Lang
                   deriving ( Eq,Ord )

    textStyleAttr :: TextStyle -> [(String,String)]
    textStyleAttr s
        | Italic <- s = [("fo:font-style"                ,"italic"    )
                        ,("style:font-style-asian"       ,"italic"    )
                        ,("style:font-style-complex"     ,"italic"    )]
        | Bold   <- s = [("fo:font-weight"               ,"bold"      )
                        ,("style:font-weight-asian"      ,"bold"      )
                        ,("style:font-weight-complex"    ,"bold"      )]
        | Strike <- s = [("style:text-line-through-style", "solid"    )]
        | Sub    <- s = [("style:text-position"          ,"sub 58%"   )]
        | Sup    <- s = [("style:text-position"          ,"super 58%" )]
        | SmallC <- s = [("fo:font-variant"              ,"small-caps")]
        | Pre    <- s = [("style:font-name"              ,"Courier New")
                        ,("style:font-name-asian"        ,"Courier New")
                        ,("style:font-name-complex"      ,"Courier New")]
        | Language lang <- s
                      = [("fo:language"                  ,langLanguage lang)
                        ,("fo:country"                   ,langRegion lang)]
        | otherwise   = []

    withLangFromAttr :: PandocMonad m => Attr -> OD m a -> OD m a
    withLangFromAttr (_,_,kvs) action =
      case lookup "lang" kvs of
           Nothing -> action
           Just l  ->
             case parseBCP47 l of
                  Right lang -> withTextStyle (Language lang) action
                  Left _ -> do
                    report $ InvalidLang l
                    action