summaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Powerpoint/Output.hs
blob: 752c81857a05658eb91157e22d41f6fe37e5c78c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
{-# LANGUAGE PatternGuards #-}

{-
Copyright (C) 2017-2018 Jesse Rosenthal <jrosenthal@jhu.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.Powerpoint.Output
   Copyright   : Copyright (C) 2017-2018 Jesse Rosenthal
   License     : GNU GPL, version 2 or above

   Maintainer  : Jesse Rosenthal <jrosenthal@jhu.edu>
   Stability   : alpha
   Portability : portable

Conversion of Presentation datatype (defined in
Text.Pandoc.Writers.Powerpoint.Presentation) to a zip archive.
-}

module Text.Pandoc.Writers.Powerpoint.Output ( presentationToArchive
                                             ) where

import Control.Monad.Except (throwError, catchError)
import Control.Monad.Reader
import Control.Monad.State
import Codec.Archive.Zip
import Data.Char (toUpper)
import Data.List (intercalate, stripPrefix, nub, union, isPrefixOf, intersperse)
import Data.Default
import Text.Pandoc.Compat.Time (formatTime, defaultTimeLocale)
import Data.Time.Clock (UTCTime)
import Data.Time.Clock.POSIX (utcTimeToPOSIXSeconds, posixSecondsToUTCTime)
import System.FilePath.Posix (splitDirectories, splitExtension, takeExtension)
import Text.XML.Light
import Text.Pandoc.Definition
import qualified Text.Pandoc.UTF8 as UTF8
import Text.Pandoc.Class (PandocMonad)
import Text.Pandoc.Error (PandocError(..))
import qualified Text.Pandoc.Class as P
import Text.Pandoc.Options
import Text.Pandoc.MIME
import qualified Data.ByteString.Lazy as BL
import Text.Pandoc.Writers.OOXML
import qualified Data.Map as M
import Data.Maybe (mapMaybe, listToMaybe, fromMaybe, isJust, maybeToList, catMaybes)
import Text.Pandoc.ImageSize
import Control.Applicative ((<|>))
import System.FilePath.Glob
import Text.TeXMath
import Text.Pandoc.Writers.Math (convertMath)
import Text.Pandoc.Writers.Powerpoint.Presentation
import Skylighting (fromColor)

-- This populates the global ids map with images already in the
-- template, so the ids won't be used by images introduced by the
-- user.
initialGlobalIds :: Archive -> Archive -> M.Map FilePath Int
initialGlobalIds refArchive distArchive =
  let archiveFiles = filesInArchive refArchive `union` filesInArchive distArchive
      mediaPaths = filter (isPrefixOf "ppt/media/image") archiveFiles

      go :: FilePath -> Maybe (FilePath, Int)
      go fp = do
        s <- stripPrefix "ppt/media/image" $ fst $ splitExtension fp
        (n, _) <- listToMaybe $ reads s
        return (fp, n)
  in
    M.fromList $ mapMaybe go mediaPaths

getPresentationSize :: Archive -> Archive -> Maybe (Integer, Integer)
getPresentationSize refArchive distArchive = do
  entry <- findEntryByPath "ppt/presentation.xml" refArchive  `mplus`
           findEntryByPath "ppt/presentation.xml" distArchive
  presElement <- parseXMLDoc $ UTF8.toStringLazy $ fromEntry entry
  let ns = elemToNameSpaces presElement
  sldSize <- findChild (elemName ns "p" "sldSz") presElement
  cxS <- findAttr (QName "cx" Nothing Nothing) sldSize
  cyS <- findAttr (QName "cy" Nothing Nothing) sldSize
  (cx, _) <- listToMaybe $ reads cxS :: Maybe (Integer, String)
  (cy, _) <- listToMaybe $ reads cyS :: Maybe (Integer, String)
  return (cx `div` 12700, cy `div` 12700)

data WriterEnv = WriterEnv { envRefArchive :: Archive
                           , envDistArchive :: Archive
                           , envUTCTime :: UTCTime
                           , envOpts :: WriterOptions
                           , envPresentationSize :: (Integer, Integer)
                           , envSlideHasHeader :: Bool
                           , envInList :: Bool
                           , envInNoteSlide :: Bool
                           , envCurSlideId :: Int
                           -- the difference between the number at
                           -- the end of the slide file name and
                           -- the rId number
                           , envSlideIdOffset :: Int
                           , envContentType :: ContentType
                           , envSlideIdMap :: M.Map SlideId Int
                           -- maps the slide number to the
                           -- corresponding notes id number. If there
                           -- are no notes for a slide, there will be
                           -- no entry in the map for it.
                           , envSpeakerNotesIdMap :: M.Map Int Int
                           }
                 deriving (Show)

instance Default WriterEnv where
  def = WriterEnv { envRefArchive = emptyArchive
                  , envDistArchive = emptyArchive
                  , envUTCTime = posixSecondsToUTCTime 0
                  , envOpts = def
                  , envPresentationSize = (720, 540)
                  , envSlideHasHeader = False
                  , envInList = False
                  , envInNoteSlide = False
                  , envCurSlideId = 1
                  , envSlideIdOffset = 1
                  , envContentType = NormalContent
                  , envSlideIdMap = mempty
                  , envSpeakerNotesIdMap = mempty
                  }

data ContentType = NormalContent
                 | TwoColumnLeftContent
                 | TwoColumnRightContent
                 deriving (Show, Eq)

data MediaInfo = MediaInfo { mInfoFilePath :: FilePath
                           , mInfoLocalId  :: Int
                           , mInfoGlobalId :: Int
                           , mInfoMimeType :: Maybe MimeType
                           , mInfoExt      :: Maybe String
                           , mInfoCaption  :: Bool
                           } deriving (Show, Eq)

data WriterState = WriterState { stLinkIds :: M.Map Int (M.Map Int LinkTarget)
                               -- (FP, Local ID, Global ID, Maybe Mime)
                               , stMediaIds :: M.Map Int [MediaInfo]
                               , stMediaGlobalIds :: M.Map FilePath Int
                               } deriving (Show, Eq)

instance Default WriterState where
  def = WriterState { stLinkIds = mempty
                    , stMediaIds = mempty
                    , stMediaGlobalIds = mempty
                    }

type P m = ReaderT WriterEnv (StateT WriterState m)

runP :: Monad m => WriterEnv -> WriterState -> P m a -> m a
runP env st p = evalStateT (runReaderT p env) st

--------------------------------------------------------------------

copyFileToArchive :: PandocMonad m => Archive -> FilePath -> P m Archive
copyFileToArchive arch fp = do
  refArchive <- asks envRefArchive
  distArchive <- asks envDistArchive
  case findEntryByPath fp refArchive `mplus` findEntryByPath fp distArchive of
    Nothing -> fail $ fp ++ " missing in reference file"
    Just e -> return $ addEntryToArchive e arch

alwaysInheritedPatterns :: [Pattern]
alwaysInheritedPatterns =
  map compile [ "docProps/app.xml"
              , "ppt/slideLayouts/slideLayout*.xml"
              , "ppt/slideLayouts/_rels/slideLayout*.xml.rels"
              , "ppt/slideMasters/slideMaster1.xml"
              , "ppt/slideMasters/_rels/slideMaster1.xml.rels"
              , "ppt/theme/theme1.xml"
              , "ppt/theme/_rels/theme1.xml.rels"
              , "ppt/presProps.xml"
              , "ppt/viewProps.xml"
              , "ppt/tableStyles.xml"
              , "ppt/media/image*"
              ]

-- We only look for these under special conditions
contingentInheritedPatterns :: Presentation -> [Pattern]
contingentInheritedPatterns pres = [] ++
  if presHasSpeakerNotes pres
  then map compile [ "ppt/notesMasters/notesMaster*.xml"
                   , "ppt/notesMasters/_rels/notesMaster*.xml.rels"
                   , "ppt/theme/theme2.xml"
                   , "ppt/theme/_rels/theme2.xml.rels"
                   ]
  else []

inheritedPatterns :: Presentation -> [Pattern]
inheritedPatterns pres =
  alwaysInheritedPatterns ++ contingentInheritedPatterns pres

patternToFilePaths :: PandocMonad m => Pattern -> P m [FilePath]
patternToFilePaths pat = do
  refArchive <- asks envRefArchive
  distArchive <- asks envDistArchive

  let archiveFiles = filesInArchive refArchive `union` filesInArchive distArchive
  return $ filter (match pat) archiveFiles

patternsToFilePaths :: PandocMonad m => [Pattern] -> P m [FilePath]
patternsToFilePaths pats = concat <$> mapM patternToFilePaths pats

-- Here are the files we'll require to make a Powerpoint document. If
-- any of these are missing, we should error out of our build.
requiredFiles :: [FilePath]
requiredFiles = [ "docProps/app.xml"
                , "ppt/presProps.xml"
                , "ppt/slideLayouts/slideLayout1.xml"
                , "ppt/slideLayouts/_rels/slideLayout1.xml.rels"
                , "ppt/slideLayouts/slideLayout2.xml"
                , "ppt/slideLayouts/_rels/slideLayout2.xml.rels"
                , "ppt/slideLayouts/slideLayout3.xml"
                , "ppt/slideLayouts/_rels/slideLayout3.xml.rels"
                , "ppt/slideLayouts/slideLayout4.xml"
                , "ppt/slideLayouts/_rels/slideLayout4.xml.rels"
                , "ppt/slideMasters/slideMaster1.xml"
                , "ppt/slideMasters/_rels/slideMaster1.xml.rels"
                , "ppt/theme/theme1.xml"
                , "ppt/viewProps.xml"
                , "ppt/tableStyles.xml"
                ]

presentationToArchiveP :: PandocMonad m => Presentation -> P m Archive
presentationToArchiveP p@(Presentation docProps slides) = do
  filePaths <- patternsToFilePaths $ inheritedPatterns p

  -- make sure all required files are available:
  let missingFiles = filter (\fp -> not (fp `elem` filePaths)) requiredFiles
  unless (null missingFiles)
    (throwError $
      PandocSomeError $
      "The following required files are missing:\n" ++
      (unlines $ map ("  " ++) missingFiles)
    )

  newArch' <- foldM copyFileToArchive emptyArchive filePaths
  -- we make a docProps/core.xml entry out of the presentation docprops
  docPropsEntry <- docPropsToEntry docProps
  -- we make this ourself in case there's something unexpected in the
  -- one in the reference doc.
  relsEntry <- topLevelRelsEntry
  -- presentation entry and rels. We have to do the rels first to make
  -- sure we know the correct offset for the rIds.
  presEntry <- presentationToPresEntry p
  presRelsEntry <- presentationToRelsEntry p
  slideEntries <- mapM slideToEntry slides
  slideRelEntries <- mapM slideToSlideRelEntry slides
  spkNotesEntries <- catMaybes <$> mapM slideToSpeakerNotesEntry slides
  spkNotesRelEntries <- catMaybes <$> mapM slideToSpeakerNotesRelEntry slides
  -- These have to come after everything, because they need the info
  -- built up in the state.
  mediaEntries <- makeMediaEntries
  contentTypesEntry <- presentationToContentTypes p >>= contentTypesToEntry
  -- fold everything into our inherited archive and return it.
  return $ foldr addEntryToArchive newArch' $
    slideEntries ++
    slideRelEntries ++
    spkNotesEntries ++
    spkNotesRelEntries ++
    mediaEntries ++
    [contentTypesEntry, docPropsEntry, relsEntry, presEntry, presRelsEntry]

makeSlideIdMap :: Presentation -> M.Map SlideId Int
makeSlideIdMap (Presentation _ slides) =
  M.fromList $ (map slideId slides) `zip` [1..]

makeSpeakerNotesMap :: Presentation -> M.Map Int Int
makeSpeakerNotesMap (Presentation _ slides) =
  M.fromList $ (mapMaybe f $ slides `zip` [1..]) `zip` [1..]
  where f (Slide _ _ Nothing, _) = Nothing
        f (Slide _ _ (Just _), n)  = Just n

presentationToArchive :: PandocMonad m => WriterOptions -> Presentation -> m Archive
presentationToArchive opts pres = do
  distArchive <- (toArchive . BL.fromStrict) <$>
                      P.readDefaultDataFile "reference.pptx"
  refArchive <- case writerReferenceDoc opts of
                     Just f  -> toArchive <$> P.readFileLazy f
                     Nothing -> (toArchive . BL.fromStrict) <$>
                        P.readDataFile "reference.pptx"

  utctime <- P.getCurrentTime

  presSize <- case getPresentationSize refArchive distArchive of
                Just sz -> return sz
                Nothing -> throwError $
                           PandocSomeError $
                           "Could not determine presentation size"

  let env = def { envRefArchive = refArchive
                , envDistArchive = distArchive
                , envUTCTime = utctime
                , envOpts = opts
                , envPresentationSize = presSize
                , envSlideIdMap = makeSlideIdMap pres
                , envSpeakerNotesIdMap = makeSpeakerNotesMap pres
                }

  let st = def { stMediaGlobalIds = initialGlobalIds refArchive distArchive
               }

  runP env st $ presentationToArchiveP pres



--------------------------------------------------

-- Check to see if the presentation has speaker notes. This will
-- influence whether we import the notesMaster template.
presHasSpeakerNotes :: Presentation -> Bool
presHasSpeakerNotes (Presentation _ slides) = any isJust $ map slideSpeakerNotes slides

curSlideHasSpeakerNotes :: PandocMonad m => P m Bool
curSlideHasSpeakerNotes = do
  sldId <- asks envCurSlideId
  notesIdMap <- asks envSpeakerNotesIdMap
  return $ isJust $ M.lookup sldId notesIdMap

--------------------------------------------------

getLayout :: PandocMonad m => Layout -> P m Element
getLayout layout = do
  let layoutpath = case layout of
        (MetadataSlide _ _ _ _) -> "ppt/slideLayouts/slideLayout1.xml"
        (TitleSlide _)          -> "ppt/slideLayouts/slideLayout3.xml"
        (ContentSlide _ _)      -> "ppt/slideLayouts/slideLayout2.xml"
        (TwoColumnSlide _ _ _)    -> "ppt/slideLayouts/slideLayout4.xml"
  distArchive <- asks envDistArchive
  root <- case findEntryByPath layoutpath distArchive of
        Just e -> case parseXMLDoc $ UTF8.toStringLazy $ fromEntry e of
                    Just element -> return $ element
                    Nothing      -> throwError $
                                    PandocSomeError $
                                    layoutpath ++ " corrupt in reference file"
        Nothing -> throwError $
                   PandocSomeError $
                   layoutpath ++ " missing in reference file"
  return root

shapeHasName :: NameSpaces -> String -> Element -> Bool
shapeHasName ns name element
  | Just nvSpPr <- findChild (elemName ns "p" "nvSpPr") element
  , Just cNvPr <- findChild (elemName ns "p" "cNvPr") nvSpPr
  , Just nm <- findAttr (QName "name" Nothing Nothing) cNvPr =
      nm == name
  | otherwise = False

shapeHasId :: NameSpaces -> String -> Element -> Bool
shapeHasId ns ident element
  | Just nvSpPr <- findChild (elemName ns "p" "nvSpPr") element
  , Just cNvPr <- findChild (elemName ns "p" "cNvPr") nvSpPr
  , Just nm <- findAttr (QName "id" Nothing Nothing) cNvPr =
      nm == ident
  | otherwise = False

-- The content shape in slideLayout2 (Title/Content) has id=3 In
-- slideLayout4 (two column) the left column is id=3, and the right
-- column is id=4.
getContentShape :: PandocMonad m => NameSpaces -> Element -> P m Element
getContentShape ns spTreeElem
  | isElem ns "p" "spTree" spTreeElem = do
      contentType <- asks envContentType
      let ident = case contentType of
            NormalContent -> "3"
            TwoColumnLeftContent -> "3"
            TwoColumnRightContent -> "4"
      case filterChild
           (\e -> (isElem ns "p" "sp" e) && (shapeHasId ns ident e))
           spTreeElem
        of
        Just e -> return e
        Nothing -> throwError $
                   PandocSomeError $
                   "Could not find shape for Powerpoint content"
getContentShape _ _ = throwError $
                      PandocSomeError $
                      "Attempted to find content on non shapeTree"

getShapeDimensions :: NameSpaces
                   -> Element
                   -> Maybe ((Integer, Integer), (Integer, Integer))
getShapeDimensions ns element
  | isElem ns "p" "sp" element = do
      spPr <- findChild (elemName ns "p" "spPr") element
      xfrm <- findChild (elemName ns "a" "xfrm") spPr
      off <- findChild (elemName ns "a" "off") xfrm
      xS <- findAttr (QName "x" Nothing Nothing) off
      yS <- findAttr (QName "y" Nothing Nothing) off
      ext <- findChild (elemName ns "a" "ext") xfrm
      cxS <- findAttr (QName "cx" Nothing Nothing) ext
      cyS <- findAttr (QName "cy" Nothing Nothing) ext
      (x, _) <- listToMaybe $ reads xS
      (y, _) <- listToMaybe $ reads yS
      (cx, _) <- listToMaybe $ reads cxS
      (cy, _) <- listToMaybe $ reads cyS
      return $ ((x `div` 12700, y `div` 12700), (cx `div` 12700, cy `div` 12700))
  | otherwise = Nothing


getMasterShapeDimensionsById :: String
                             -> Element
                             -> Maybe ((Integer, Integer), (Integer, Integer))
getMasterShapeDimensionsById ident master = do
  let ns = elemToNameSpaces master
  cSld <- findChild (elemName ns "p" "cSld") master
  spTree <- findChild (elemName ns "p" "spTree") cSld
  sp <- filterChild (\e -> (isElem ns "p" "sp" e) && (shapeHasId ns ident e)) spTree
  getShapeDimensions ns sp

getContentShapeSize :: PandocMonad m
                    => NameSpaces
                    -> Element
                    -> Element
                    -> P m ((Integer, Integer), (Integer, Integer))
getContentShapeSize ns layout master
  | isElem ns "p" "sldLayout" layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld = do
      sp  <- getContentShape ns spTree
      case getShapeDimensions ns sp of
        Just sz -> return sz
        Nothing -> do let mbSz =
                            findChild (elemName ns "p" "nvSpPr") sp >>=
                            findChild (elemName ns "p" "cNvPr") >>=
                            findAttr (QName "id" Nothing Nothing) >>=
                            flip getMasterShapeDimensionsById master
                      case mbSz of
                        Just sz' -> return sz'
                        Nothing -> throwError $
                                   PandocSomeError $
                                   "Couldn't find necessary content shape size"
getContentShapeSize _ _ _ = throwError $
                            PandocSomeError $
                            "Attempted to find content shape size in non-layout"

replaceNamedChildren :: NameSpaces
                   -> String
                   -> String
                   -> [Element]
                   -> Element
                   -> Element
replaceNamedChildren ns prefix name newKids element =
  element { elContent = concat $ fun True $ elContent element }
  where
    fun :: Bool -> [Content] -> [[Content]]
    fun _ [] = []
    fun switch ((Elem e) : conts) | isElem ns prefix name e =
                                      if switch
                                      then (map Elem $ newKids) : fun False conts
                                      else fun False conts
    fun switch (cont : conts) = [cont] : fun switch conts

----------------------------------------------------------------

registerLink :: PandocMonad m => LinkTarget -> P m Int
registerLink link = do
  curSlideId <- asks envCurSlideId
  linkReg <- gets stLinkIds
  mediaReg <- gets stMediaIds
  hasSpeakerNotes <- curSlideHasSpeakerNotes
  let maxLinkId = case M.lookup curSlideId linkReg of
        Just mp -> case M.keys mp of
          [] -> if hasSpeakerNotes then 2 else 1
          ks -> maximum ks
        Nothing -> if hasSpeakerNotes then 2 else 1
      maxMediaId = case M.lookup curSlideId mediaReg of
        Just [] -> if hasSpeakerNotes then 2 else 1
        Just mInfos -> maximum $ map mInfoLocalId mInfos
        Nothing -> if hasSpeakerNotes then 2 else 1
      maxId = max maxLinkId maxMediaId
      slideLinks = case M.lookup curSlideId linkReg of
        Just mp -> M.insert (maxId + 1) link mp
        Nothing -> M.singleton (maxId + 1) link
  modify $ \st -> st{ stLinkIds = M.insert curSlideId slideLinks linkReg}
  return $ maxId + 1

registerMedia :: PandocMonad m => FilePath -> [ParaElem] -> P m MediaInfo
registerMedia fp caption = do
  curSlideId <- asks envCurSlideId
  linkReg <- gets stLinkIds
  mediaReg <- gets stMediaIds
  globalIds <- gets stMediaGlobalIds
  hasSpeakerNotes <- curSlideHasSpeakerNotes
  let maxLinkId = case M.lookup curSlideId linkReg of
        Just mp -> case M.keys mp of
          [] -> if hasSpeakerNotes then 2 else 1
          ks -> maximum ks
        Nothing -> if hasSpeakerNotes then 2 else 1
      maxMediaId = case M.lookup curSlideId mediaReg of
        Just [] -> if hasSpeakerNotes then 2 else 1
        Just mInfos -> maximum $ map mInfoLocalId mInfos
        Nothing -> if hasSpeakerNotes then 2 else 1
      maxLocalId = max maxLinkId maxMediaId

      maxGlobalId = case M.elems globalIds of
        [] -> 0
        ids -> maximum ids

  (imgBytes, mbMt) <- P.fetchItem fp
  let imgExt = (mbMt >>= extensionFromMimeType >>= (\x -> return $ '.':x))
               <|>
               case imageType imgBytes of
                 Just Png  -> Just ".png"
                 Just Jpeg -> Just ".jpeg"
                 Just Gif  -> Just ".gif"
                 Just Pdf  -> Just ".pdf"
                 Just Eps  -> Just ".eps"
                 Just Svg  -> Just ".svg"
                 Just Emf  -> Just ".emf"
                 Nothing   -> Nothing

  let newGlobalId = case M.lookup fp globalIds of
        Just ident -> ident
        Nothing    -> maxGlobalId + 1

  let newGlobalIds = M.insert fp newGlobalId globalIds

  let mediaInfo = MediaInfo { mInfoFilePath = fp
                            , mInfoLocalId = maxLocalId + 1
                            , mInfoGlobalId = newGlobalId
                            , mInfoMimeType = mbMt
                            , mInfoExt = imgExt
                            , mInfoCaption = (not . null) caption
                            }

  let slideMediaInfos = case M.lookup curSlideId mediaReg of
        Just minfos -> mediaInfo : minfos
        Nothing     -> [mediaInfo]


  modify $ \st -> st{ stMediaIds = M.insert curSlideId slideMediaInfos mediaReg
                    , stMediaGlobalIds = newGlobalIds
                    }
  return mediaInfo

makeMediaEntry :: PandocMonad m => MediaInfo -> P m Entry
makeMediaEntry mInfo = do
  epochtime <- (floor . utcTimeToPOSIXSeconds) <$> asks envUTCTime
  (imgBytes, _) <- P.fetchItem (mInfoFilePath mInfo)
  let ext = case mInfoExt mInfo of
              Just e -> e
              Nothing -> ""
  let fp = "ppt/media/image" ++ (show $ mInfoGlobalId mInfo) ++ ext
  return $ toEntry fp epochtime $ BL.fromStrict imgBytes

makeMediaEntries :: PandocMonad m => P m [Entry]
makeMediaEntries = do
  mediaInfos <- gets stMediaIds
  let allInfos = mconcat $ M.elems mediaInfos
  mapM makeMediaEntry allInfos

-- -- | Scales the image to fit the page
-- -- sizes are passed in emu
-- fitToPage' :: (Double, Double)  -- image size in emu
--            -> Integer           -- pageWidth
--            -> Integer           -- pageHeight
--            -> (Integer, Integer) -- imagesize
-- fitToPage' (x, y) pageWidth pageHeight
--   -- Fixes width to the page width and scales the height
--   | x <= fromIntegral pageWidth && y <= fromIntegral pageHeight =
--       (floor x, floor y)
--   | x / fromIntegral pageWidth > y / fromIntegral pageWidth =
--       (pageWidth, floor $ ((fromIntegral pageWidth) / x) * y)
--   | otherwise =
--       (floor $ ((fromIntegral pageHeight) / y) * x, pageHeight)

-- positionImage :: (Double, Double) -> Integer -> Integer -> (Integer, Integer)
-- positionImage (x, y) pageWidth pageHeight =
--   let (x', y') = fitToPage' (x, y) pageWidth pageHeight
--   in
--     ((pageWidth - x') `div` 2, (pageHeight - y') `div`  2)

getMaster :: PandocMonad m => P m Element
getMaster = do
  refArchive <- asks envRefArchive
  distArchive <- asks envDistArchive
  parseXml refArchive distArchive "ppt/slideMasters/slideMaster1.xml"

-- We want to get the header dimensions, so we can make sure that the
-- image goes underneath it. We only use this in a content slide if it
-- has a header.

-- getHeaderSize :: PandocMonad m => P m ((Integer, Integer), (Integer, Integer))
-- getHeaderSize = do
--   master <- getMaster
--   let ns = elemToNameSpaces master
--       sps = [master] >>=
--             findChildren (elemName ns "p" "cSld") >>=
--             findChildren (elemName ns "p" "spTree") >>=
--             findChildren (elemName ns "p" "sp")
--       mbXfrm =
--         listToMaybe (filter (shapeHasName ns "Title Placeholder 1") sps) >>=
--         findChild (elemName ns "p" "spPr") >>=
--         findChild (elemName ns "a" "xfrm")
--       xoff = mbXfrm >>=
--              findChild (elemName ns "a" "off") >>=
--              findAttr (QName "x" Nothing Nothing) >>=
--              (listToMaybe . (\s -> reads s :: [(Integer, String)]))
--       yoff = mbXfrm >>=
--              findChild (elemName ns "a" "off") >>=
--              findAttr (QName "y" Nothing Nothing) >>=
--              (listToMaybe . (\s -> reads s :: [(Integer, String)]))
--       xext = mbXfrm >>=
--              findChild (elemName ns "a" "ext") >>=
--              findAttr (QName "cx" Nothing Nothing) >>=
--              (listToMaybe . (\s -> reads s :: [(Integer, String)]))
--       yext = mbXfrm >>=
--              findChild (elemName ns "a" "ext") >>=
--              findAttr (QName "cy" Nothing Nothing) >>=
--              (listToMaybe . (\s -> reads s :: [(Integer, String)]))
--       off = case xoff of
--               Just (xoff', _) | Just (yoff',_) <- yoff -> (xoff', yoff')
--               _                               -> (1043490, 1027664)
--       ext = case xext of
--               Just (xext', _) | Just (yext',_) <- yext -> (xext', yext')
--               _                               -> (7024744, 1143000)
--   return $ (off, ext)

-- Hard-coded for now
-- captionPosition :: ((Integer, Integer), (Integer, Integer))
-- captionPosition = ((457200, 6061972), (8229600, 527087))

captionHeight :: Integer
captionHeight = 40

createCaption :: PandocMonad m
              => ((Integer, Integer), (Integer, Integer))
              -> [ParaElem]
              -> P m Element
createCaption contentShapeDimensions paraElements = do
  let para = Paragraph def{pPropAlign = Just AlgnCenter} paraElements
  elements <- mapM paragraphToElement [para]
  let ((x, y), (cx, cy)) = contentShapeDimensions
  let txBody = mknode "p:txBody" [] $
               [mknode "a:bodyPr" [] (), mknode "a:lstStyle" [] ()] ++ elements
  return $
    mknode "p:sp" [] [ mknode "p:nvSpPr" []
                       [ mknode "p:cNvPr" [("id","1"), ("name","TextBox 3")] ()
                       , mknode "p:cNvSpPr" [("txBox", "1")] ()
                       , mknode "p:nvPr" [] ()
                       ]
                     , mknode "p:spPr" []
                       [ mknode "a:xfrm" []
                         [ mknode "a:off" [("x", show $ 12700 * x),
                                           ("y", show $ 12700 * (y + cy - captionHeight))] ()
                         , mknode "a:ext" [("cx", show $ 12700 * cx),
                                           ("cy", show $ 12700 * captionHeight)] ()
                         ]
                       , mknode "a:prstGeom" [("prst", "rect")]
                         [ mknode "a:avLst" [] ()
                         ]
                       , mknode "a:noFill" [] ()
                       ]
                     , txBody
                     ]

makePicElements :: PandocMonad m
                => Element
                -> PicProps
                -> MediaInfo
                -> [ParaElem]
                -> P m [Element]
makePicElements layout picProps mInfo alt = do
  opts <- asks envOpts
  (pageWidth, pageHeight) <- asks envPresentationSize
  -- hasHeader <- asks envSlideHasHeader
  let hasCaption = mInfoCaption mInfo
  (imgBytes, _) <- P.fetchItem (mInfoFilePath mInfo)
  let (pxX, pxY) = case imageSize opts imgBytes of
        Right sz -> sizeInPixels $ sz
        Left _   -> sizeInPixels $ def
  master <- getMaster
  let ns = elemToNameSpaces layout
  ((x, y), (cx, cytmp)) <- getContentShapeSize ns layout master
                           `catchError`
                           (\_ -> return ((0, 0), (pageWidth, pageHeight)))

  let cy = if hasCaption then cytmp - captionHeight else cytmp

  let imgRatio = fromIntegral pxX / fromIntegral pxY :: Double
      boxRatio = fromIntegral cx / fromIntegral cy :: Double
      (dimX, dimY) = if imgRatio > boxRatio
                     then (fromIntegral cx, fromIntegral cx / imgRatio)
                     else (fromIntegral cy * imgRatio, fromIntegral cy)

      (dimX', dimY') = (round dimX * 12700, round dimY * 12700) :: (Integer, Integer)
      (xoff, yoff) = (fromIntegral x + (fromIntegral cx - dimX) / 2,
                      fromIntegral y + (fromIntegral cy - dimY) / 2)
      (xoff', yoff') = (round xoff * 12700, round yoff * 12700) :: (Integer, Integer)

  let cNvPicPr = mknode "p:cNvPicPr" [] $
                 mknode "a:picLocks" [("noGrp","1")
                                     ,("noChangeAspect","1")] ()
  -- cNvPr will contain the link information so we do that separately,
  -- and register the link if necessary.
  let cNvPrAttr = [("descr", mInfoFilePath mInfo), ("id","0"),("name","Picture 1")]
  cNvPr <- case picPropLink picProps of
    Just link -> do idNum <- registerLink link
                    return $ mknode "p:cNvPr" cNvPrAttr $
                      mknode "a:hlinkClick" [("r:id", "rId" ++ show idNum)] ()
    Nothing   -> return $ mknode "p:cNvPr" cNvPrAttr ()
  let nvPicPr  = mknode "p:nvPicPr" []
                 [ cNvPr
                 , cNvPicPr
                 , mknode "p:nvPr" [] ()]
  let blipFill = mknode "p:blipFill" []
                 [ mknode "a:blip" [("r:embed", "rId" ++ (show $ mInfoLocalId mInfo))] ()
                 , mknode "a:stretch" [] $
                   mknode "a:fillRect" [] () ]
  let xfrm =    mknode "a:xfrm" []
                [ mknode "a:off" [("x",show xoff'), ("y",show yoff')] ()
                , mknode "a:ext" [("cx",show dimX')
                                 ,("cy",show dimY')] () ]
  let prstGeom = mknode "a:prstGeom" [("prst","rect")] $
                 mknode "a:avLst" [] ()
  let ln =      mknode "a:ln" [("w","9525")]
                [ mknode "a:noFill" [] ()
                , mknode "a:headEnd" [] ()
                , mknode "a:tailEnd" [] () ]
  let spPr =    mknode "p:spPr" [("bwMode","auto")]
                [xfrm, prstGeom, mknode "a:noFill" [] (), ln]

  let picShape = mknode "p:pic" []
                 [ nvPicPr
                 , blipFill
                 , spPr ]

  -- And now, maybe create the caption:
  if hasCaption
    then do cap <- createCaption ((x, y), (cx, cytmp)) alt
            return [picShape, cap]
    else return [picShape]


paraElemToElement :: PandocMonad m => ParaElem -> P m Element
paraElemToElement Break = return $ mknode "a:br" [] ()
paraElemToElement (Run rpr s) = do
  let sizeAttrs = case rPropForceSize rpr of
                    Just n -> [("sz", (show $ n * 100))]
                    Nothing -> if rPropCode rpr
                               -- hardcoded size for code for now
                               then [("sz", "1800")]
                               else []
      attrs = sizeAttrs ++
        (if rPropBold rpr then [("b", "1")] else []) ++
        (if rPropItalics rpr then [("i", "1")] else []) ++
        (if rPropUnderline rpr then [("u", "sng")] else []) ++
        (case rStrikethrough rpr of
            Just NoStrike     -> [("strike", "noStrike")]
            Just SingleStrike -> [("strike", "sngStrike")]
            Just DoubleStrike -> [("strike", "dblStrike")]
            Nothing -> []) ++
        (case rBaseline rpr of
            Just n -> [("baseline", show n)]
            Nothing -> []) ++
        (case rCap rpr of
            Just NoCapitals -> [("cap", "none")]
            Just SmallCapitals -> [("cap", "small")]
            Just AllCapitals -> [("cap", "all")]
            Nothing -> []) ++
        []
  linkProps <- case rLink rpr of
                 Just link -> do
                   idNum <- registerLink link
                   -- first we have to make sure that if it's an
                   -- anchor, it's in the anchor map. If not, there's
                   -- no link.
                   return $ case link of
                     InternalTarget _ ->
                       let linkAttrs =
                             [ ("r:id", "rId" ++ show idNum)
                             , ("action", "ppaction://hlinksldjump")
                             ]
                       in [mknode "a:hlinkClick" linkAttrs ()]
                     -- external
                     ExternalTarget _ ->
                       let linkAttrs =
                             [ ("r:id", "rId" ++ show idNum)
                             ]
                       in [mknode "a:hlinkClick" linkAttrs ()]
                 Nothing -> return []
  let colorContents = case rSolidFill rpr of
                        Just color ->
                          case fromColor color of
                            '#':hx ->  [mknode "a:solidFill" []
                                        [mknode "a:srgbClr" [("val", map toUpper hx)] ()]
                                       ]
                            _ -> []
                        Nothing -> []
  let codeContents = if rPropCode rpr
                     then [mknode "a:latin" [("typeface", "Courier")] ()]
                     else []
  let propContents = linkProps ++ colorContents ++ codeContents
  return $ mknode "a:r" [] [ mknode "a:rPr" attrs $ propContents
                           , mknode "a:t" [] s
                           ]
paraElemToElement (MathElem mathType texStr) = do
  res <- convertMath writeOMML mathType (unTeXString texStr)
  case res of
    Right r -> return $ mknode "a14:m" [] $ addMathInfo r
    Left (Str s) -> paraElemToElement (Run def s)
    Left _       -> throwError $ PandocShouldNeverHappenError "non-string math fallback"

-- This is a bit of a kludge -- really requires adding an option to
-- TeXMath, but since that's a different package, we'll do this one
-- step at a time.
addMathInfo :: Element -> Element
addMathInfo element =
  let mathspace = Attr { attrKey = (QName "m" Nothing (Just "xmlns"))
                       , attrVal = "http://schemas.openxmlformats.org/officeDocument/2006/math"
                       }
  in add_attr mathspace element

-- We look through the element to see if it contains an a14:m
-- element. If so, we surround it. This is a bit ugly, but it seems
-- more dependable than looking through shapes for math. Plus this is
-- an xml implementation detail, so it seems to make sense to do it at
-- the xml level.
surroundWithMathAlternate :: Element -> Element
surroundWithMathAlternate element =
  case findElement (QName "m" Nothing (Just "a14")) element of
    Just _ ->
      mknode "mc:AlternateContent"
         [("xmlns:mc", "http://schemas.openxmlformats.org/markup-compatibility/2006")
         ] [ mknode "mc:Choice"
             [ ("xmlns:a14", "http://schemas.microsoft.com/office/drawing/2010/main")
             , ("Requires", "a14")] [ element ]
           ]
    Nothing -> element

paragraphToElement :: PandocMonad m => Paragraph -> P m Element
paragraphToElement par = do
  let
    attrs = [("lvl", show $ pPropLevel $ paraProps par)] ++
            (case pPropMarginLeft (paraProps par) of
               Just px -> [("marL", show $ 12700 * px), ("indent", "0")]
               Nothing -> []
            ) ++
            (case pPropAlign (paraProps par) of
               Just AlgnLeft -> [("algn", "l")]
               Just AlgnRight -> [("algn", "r")]
               Just AlgnCenter -> [("algn", "ctr")]
               Nothing -> []
            )
    props = [] ++
            (case pPropSpaceBefore $ paraProps par of
               Just px -> [mknode "a:spcBef" [] [
                              mknode "a:spcPts" [("val", show $ 100 * px)] ()
                              ]
                          ]
               Nothing -> []
            ) ++
            (case pPropBullet $ paraProps par of
               Just Bullet -> []
               Just (AutoNumbering attrs') ->
                 [mknode "a:buAutoNum" [("type", autoNumberingToType attrs')] ()]
               Nothing -> [mknode "a:buNone" [] ()]
            )
  paras <- mapM paraElemToElement (paraElems par)
  return $ mknode "a:p" [] $ [mknode "a:pPr" attrs props] ++ paras

shapeToElement :: PandocMonad m => Element -> Shape -> P m Element
shapeToElement layout (TextBox paras)
  | ns <- elemToNameSpaces layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld = do
      sp <- getContentShape ns spTree
      elements <- mapM paragraphToElement paras
      let txBody = mknode "p:txBody" [] $
                   [mknode "a:bodyPr" [] (), mknode "a:lstStyle" [] ()] ++ elements
          emptySpPr = mknode "p:spPr" [] ()
      return $
        surroundWithMathAlternate $
        replaceNamedChildren ns "p" "txBody" [txBody] $
        replaceNamedChildren ns "p" "spPr" [emptySpPr] $
        sp
-- GraphicFrame and Pic should never reach this.
shapeToElement _ _ = return $ mknode "p:sp" [] ()

shapeToElements :: PandocMonad m => Element -> Shape -> P m [Element]
shapeToElements layout (Pic picProps fp alt) = do
  mInfo <- registerMedia fp alt
  case mInfoExt mInfo of
    Just _ -> do
      makePicElements layout picProps mInfo alt
    Nothing -> shapeToElements layout $ TextBox [Paragraph def alt]
shapeToElements layout (GraphicFrame tbls cptn) =
  graphicFrameToElements layout tbls cptn
shapeToElements layout shp = do
  element <- shapeToElement layout shp
  return [element]

shapesToElements :: PandocMonad m => Element -> [Shape] -> P m [Element]
shapesToElements layout shps = do
 concat <$> mapM (shapeToElements layout) shps

graphicFrameToElements :: PandocMonad m => Element -> [Graphic] -> [ParaElem] -> P m [Element]
graphicFrameToElements layout tbls caption = do
  -- get the sizing
  master <- getMaster
  (pageWidth, pageHeight) <- asks envPresentationSize
  let ns = elemToNameSpaces layout
  ((x, y), (cx, cytmp)) <- getContentShapeSize ns layout master
                           `catchError`
                           (\_ -> return ((0, 0), (pageWidth, pageHeight)))

  let cy = if (not $ null caption) then cytmp - captionHeight else cytmp

  elements <- mapM (graphicToElement cx) tbls
  let graphicFrameElts =
        mknode "p:graphicFrame" [] $
        [ mknode "p:nvGraphicFramePr" [] $
          [ mknode "p:cNvPr" [("id", "6"), ("name", "Content Placeholder 5")] ()
          , mknode "p:cNvGraphicFramePr" [] $
            [mknode "a:graphicFrameLocks" [("noGrp", "1")] ()]
          , mknode "p:nvPr" [] $
            [mknode "p:ph" [("idx", "1")] ()]
          ]
        , mknode "p:xfrm" [] $
          [ mknode "a:off" [("x", show $ 12700 * x), ("y", show $ 12700 * y)] ()
          , mknode "a:ext" [("cx", show $ 12700 * cx), ("cy", show $ 12700 * cy)] ()
          ]
        ] ++ elements

  if (not $ null caption)
    then do capElt <- createCaption ((x, y), (cx, cytmp)) caption
            return [graphicFrameElts, capElt]
    else return [graphicFrameElts]

graphicToElement :: PandocMonad m => Integer -> Graphic -> P m Element
graphicToElement tableWidth (Tbl tblPr hdrCells rows) = do
  let colWidths = if null hdrCells
                  then case rows of
                         r : _ | not (null r) -> replicate (length r) $
                                                (tableWidth `div` (toInteger $ length r))
                         -- satisfy the compiler. This is the same as
                         -- saying that rows is empty, but the compiler
                         -- won't understand that `[]` exhausts the
                         -- alternatives.
                         _ -> []
                  else replicate (length hdrCells) $
                       (tableWidth `div` (toInteger $ length hdrCells))

  let cellToOpenXML paras =
        do elements <- mapM paragraphToElement paras
           let elements' = if null elements
                           then [mknode "a:p" [] [mknode "a:endParaRPr" [] ()]]
                           else elements
           return $
             [mknode "a:txBody" [] $
               ([ mknode "a:bodyPr" [] ()
                , mknode "a:lstStyle" [] ()]
                 ++ elements')]
  headers' <- mapM cellToOpenXML hdrCells
  rows' <- mapM (mapM cellToOpenXML) rows
  let borderProps = mknode "a:tcPr" [] ()
  let emptyCell = [mknode "a:p" [] [mknode "a:pPr" [] ()]]
  let mkcell border contents = mknode "a:tc" []
                            $ (if null contents
                               then emptyCell
                               else contents) ++ [ borderProps | border ]
  let mkrow border cells = mknode "a:tr" [("h", "0")] $ map (mkcell border) cells

  let mkgridcol w = mknode "a:gridCol"
                       [("w", show ((12700 * w) :: Integer))] ()
  let hasHeader = not (all null hdrCells)
  return $ mknode "a:graphic" [] $
    [mknode "a:graphicData" [("uri", "http://schemas.openxmlformats.org/drawingml/2006/table")] $
     [mknode "a:tbl" [] $
      [ mknode "a:tblPr" [ ("firstRow", if tblPrFirstRow tblPr then "1" else "0")
                         , ("bandRow", if tblPrBandRow tblPr then "1" else "0")
                         ] ()
      , mknode "a:tblGrid" [] (if all (==0) colWidths
                               then []
                               else map mkgridcol colWidths)
      ]
      ++ [ mkrow True headers' | hasHeader ] ++ map (mkrow False) rows'
     ]
    ]

getShapeByName :: NameSpaces -> Element -> String -> Maybe Element
getShapeByName ns spTreeElem name
  | isElem ns "p" "spTree" spTreeElem =
  filterChild (\e -> (isElem ns "p" "sp" e) && (shapeHasName ns name e)) spTreeElem
  | otherwise = Nothing



getShapeByPlaceHolderType :: NameSpaces -> Element -> String -> Maybe Element
getShapeByPlaceHolderType ns spTreeElem phType
  | isElem ns "p" "spTree" spTreeElem =
    let findPhType element = isElem ns "p" "sp" element &&
                             Just phType == (Just element >>=
                                             findChild (elemName ns "p" "nvSpPr") >>=
                                             findChild (elemName ns "p" "nvPr") >>=
                                             findChild (elemName ns "p" "ph") >>=
                                             findAttr (QName "type" Nothing Nothing))
    in
      filterChild findPhType spTreeElem
  | otherwise = Nothing

-- getShapeById :: NameSpaces -> Element -> String -> Maybe Element
-- getShapeById ns spTreeElem ident
--   | isElem ns "p" "spTree" spTreeElem =
--   filterChild (\e -> (isElem ns "p" "sp" e) && (shapeHasId ns ident e)) spTreeElem
--   | otherwise = Nothing

nonBodyTextToElement :: PandocMonad m => Element -> String -> [ParaElem] -> P m Element
nonBodyTextToElement layout shapeName paraElements
  | ns <- elemToNameSpaces layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld
  , Just sp <- getShapeByName ns spTree shapeName = do
      let hdrPara = Paragraph def paraElements
      element <- paragraphToElement hdrPara
      let txBody = mknode "p:txBody" [] $
                   [mknode "a:bodyPr" [] (), mknode "a:lstStyle" [] ()] ++
                   [element]
      return $ replaceNamedChildren ns "p" "txBody" [txBody] sp
  -- XXX: TODO
  | otherwise = return $ mknode "p:sp" [] ()

contentToElement :: PandocMonad m => Element -> [ParaElem] -> [Shape] -> P m Element
contentToElement layout hdrShape shapes
  | ns <- elemToNameSpaces layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld = do
      element <- nonBodyTextToElement layout "Title 1" hdrShape
      let hdrShapeElements = if null hdrShape
                             then []
                             else [element]
      contentElements <- local
                         (\env -> env {envContentType = NormalContent})
                         (shapesToElements layout shapes)
      return $
        replaceNamedChildren ns "p" "sp"
        (hdrShapeElements ++ contentElements)
        spTree
contentToElement _ _ _ = return $ mknode "p:sp" [] ()

twoColumnToElement :: PandocMonad m => Element -> [ParaElem] -> [Shape] -> [Shape] -> P m Element
twoColumnToElement layout hdrShape shapesL shapesR
  | ns <- elemToNameSpaces layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld = do
      element <- nonBodyTextToElement layout "Title 1" hdrShape
      let hdrShapeElements = if null hdrShape
                             then []
                             else [element]
      contentElementsL <- local
                          (\env -> env {envContentType =TwoColumnLeftContent})
                          (shapesToElements layout shapesL)
      contentElementsR <- local
                          (\env -> env {envContentType =TwoColumnRightContent})
                          (shapesToElements layout shapesR)
      -- let contentElementsL' = map (setIdx ns "1") contentElementsL
      --     contentElementsR' = map (setIdx ns "2") contentElementsR
      return $
        replaceNamedChildren ns "p" "sp"
        (hdrShapeElements ++ contentElementsL ++ contentElementsR)
        spTree
twoColumnToElement _ _ _ _= return $ mknode "p:sp" [] ()


titleToElement :: PandocMonad m => Element -> [ParaElem] -> P m Element
titleToElement layout titleElems
  | ns <- elemToNameSpaces layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld = do
      element <- nonBodyTextToElement layout "Title 1" titleElems
      let titleShapeElements = if null titleElems
                               then []
                               else [element]
      return $ replaceNamedChildren ns "p" "sp" titleShapeElements spTree
titleToElement _ _ = return $ mknode "p:sp" [] ()

metadataToElement :: PandocMonad m => Element -> [ParaElem] -> [ParaElem] -> [[ParaElem]] -> [ParaElem] -> P m Element
metadataToElement layout titleElems subtitleElems authorsElems dateElems
  | ns <- elemToNameSpaces layout
  , Just cSld <- findChild (elemName ns "p" "cSld") layout
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld = do
      titleShapeElements <- if null titleElems
                            then return []
                            else sequence [nonBodyTextToElement layout "Title 1" titleElems]
      let combinedAuthorElems = intercalate [Break] authorsElems
          subtitleAndAuthorElems = intercalate [Break, Break] [subtitleElems, combinedAuthorElems]
      subtitleShapeElements <- if null subtitleAndAuthorElems
                               then return []
                               else sequence [nonBodyTextToElement layout "Subtitle 2" subtitleAndAuthorElems]
      dateShapeElements <- if null dateElems
                           then return []
                           else sequence [nonBodyTextToElement layout "Date Placeholder 3" dateElems]
      return $ replaceNamedChildren ns "p" "sp"
        (titleShapeElements ++ subtitleShapeElements ++ dateShapeElements)
        spTree
metadataToElement _ _ _ _ _ = return $ mknode "p:sp" [] ()

slideToElement :: PandocMonad m => Slide -> P m Element
slideToElement (Slide _ l@(ContentSlide hdrElems shapes) _ )= do
  layout <- getLayout l
  spTree <- local (\env -> if null hdrElems
                           then env
                           else env{envSlideHasHeader=True}) $
            contentToElement layout hdrElems shapes
  return $ mknode "p:sld"
    [ ("xmlns:a", "http://schemas.openxmlformats.org/drawingml/2006/main"),
      ("xmlns:r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships"),
      ("xmlns:p", "http://schemas.openxmlformats.org/presentationml/2006/main")
    ] [mknode "p:cSld" [] [spTree]]
slideToElement (Slide _ l@(TwoColumnSlide hdrElems shapesL shapesR) _) = do
  layout <- getLayout l
  spTree <- local (\env -> if null hdrElems
                           then env
                           else env{envSlideHasHeader=True}) $
            twoColumnToElement layout hdrElems shapesL shapesR
  return $ mknode "p:sld"
    [ ("xmlns:a", "http://schemas.openxmlformats.org/drawingml/2006/main"),
      ("xmlns:r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships"),
      ("xmlns:p", "http://schemas.openxmlformats.org/presentationml/2006/main")
    ] [mknode "p:cSld" [] [spTree]]
slideToElement (Slide _ l@(TitleSlide hdrElems) _) = do
  layout <- getLayout l
  spTree <- titleToElement layout hdrElems
  return $ mknode "p:sld"
    [ ("xmlns:a", "http://schemas.openxmlformats.org/drawingml/2006/main"),
      ("xmlns:r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships"),
      ("xmlns:p", "http://schemas.openxmlformats.org/presentationml/2006/main")
    ] [mknode "p:cSld" [] [spTree]]
slideToElement (Slide _ l@(MetadataSlide titleElems subtitleElems authorElems dateElems) _) = do
  layout <- getLayout l
  spTree <- metadataToElement layout titleElems subtitleElems authorElems dateElems
  return $ mknode "p:sld"
    [ ("xmlns:a", "http://schemas.openxmlformats.org/drawingml/2006/main"),
      ("xmlns:r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships"),
      ("xmlns:p", "http://schemas.openxmlformats.org/presentationml/2006/main")
    ] [mknode "p:cSld" [] [spTree]]


--------------------------------------------------------------------
-- Notes:

getNotesMaster :: PandocMonad m => P m Element
getNotesMaster = do
  let notesMasterPath = "ppt/notesMasters/notesMaster1.xml"
  distArchive <- asks envDistArchive
  root <- case findEntryByPath notesMasterPath distArchive of
        Just e -> case parseXMLDoc $ UTF8.toStringLazy $ fromEntry e of
                    Just element -> return $ element
                    Nothing      -> throwError $
                                    PandocSomeError $
                                    notesMasterPath ++ " corrupt in reference file"
        Nothing -> throwError $
                   PandocSomeError $
                   notesMasterPath ++ " missing in reference file"
  return root

getSlideNumberFieldId :: PandocMonad m => Element -> P m String
getSlideNumberFieldId notesMaster
  | ns <- elemToNameSpaces notesMaster
  , Just cSld <- findChild (elemName ns "p" "cSld") notesMaster
  , Just spTree <- findChild (elemName ns "p" "spTree") cSld
  , Just sp <- getShapeByPlaceHolderType ns spTree "sldNum"
  , Just txBody <- findChild (elemName ns "p" "txBody") sp
  , Just p <- findChild (elemName ns "a" "p") txBody
  , Just fld <- findChild (elemName ns "a" "fld") p
  , Just fldId <- findAttr (QName "id" Nothing Nothing) fld =
      return fldId
  | otherwise = throwError $
                PandocSomeError $
                "No field id for slide numbers in notesMaster.xml"

speakerNotesSlideImage :: Element
speakerNotesSlideImage =
  mknode "p:sp" [] $
  [ mknode "p:nvSpPr" [] $
    [ mknode "p:cNvPr" [ ("id", "2")
                       , ("name", "Slide Image Placeholder 1")
                       ] ()
    , mknode "p:cNvSpPr" [] $
      [ mknode "a:spLocks" [ ("noGrp", "1")
                           , ("noRot", "1")
                           , ("noChangeAspect", "1")
                           ] ()
      ]
    , mknode "p:nvPr" [] $
      [ mknode "p:ph" [("type", "sldImg")] ()]
    ]
  , mknode "p:spPr" [] ()
  ]

-- we want to wipe links from the speaker notes in the
-- paragraphs. Powerpoint doesn't allow you to input them, and it
-- would provide extra complications.
removeParaLinks :: Paragraph -> Paragraph
removeParaLinks paragraph = paragraph{paraElems = map f (paraElems paragraph)}
  where f (Run rProps s) = Run rProps{rLink=Nothing} s
        f pe             = pe

-- put an empty paragraph between paragraphs for more expected spacing.
spaceParas :: [Paragraph] -> [Paragraph]
spaceParas = intersperse (Paragraph def [])

speakerNotesBody :: PandocMonad m => [Paragraph] -> P m Element
speakerNotesBody paras = do
  elements <- mapM paragraphToElement $ spaceParas $ map removeParaLinks paras
  let txBody = mknode "p:txBody" [] $
               [mknode "a:bodyPr" [] (), mknode "a:lstStyle" [] ()] ++ elements
  return $
    mknode "p:sp" [] $
    [ mknode "p:nvSpPr" [] $
      [ mknode "p:cNvPr" [ ("id", "3")
                         , ("name", "Notes Placeholder 2")
                         ] ()
      , mknode "p:cNvSpPr" [] $
        [ mknode "a:spLocks" [("noGrp", "1")] ()]
      , mknode "p:nvPr" [] $
        [ mknode "p:ph" [("type", "body"), ("idx", "1")] ()]
      ]
    , mknode "p:spPr" [] ()
    , txBody
    ]

speakerNotesSlideNumber :: Int -> String -> Element
speakerNotesSlideNumber pgNum fieldId =
  mknode "p:sp" [] $
  [ mknode "p:nvSpPr" [] $
    [ mknode "p:cNvPr" [ ("id", "4")
                       , ("name", "Slide Number Placeholder 3")
                       ] ()
    , mknode "p:cNvSpPr" [] $
      [ mknode "a:spLocks" [("noGrp", "1")] ()]
    , mknode "p:nvPr" [] $
      [ mknode "p:ph" [ ("type", "sldNum")
                      , ("sz", "quarter")
                      , ("idx", "10")
                      ] ()
      ]
    ]
  , mknode "p:spPr" [] ()
  , mknode "p:txBody" [] $
    [ mknode "a:bodyPr" [] ()
    , mknode "a:lstStyle" [] ()
    , mknode "a:p" [] $
      [ mknode "a:fld" [ ("id", fieldId)
                       , ("type", "slidenum")
                       ]
        [ mknode "a:rPr" [("lang", "en-US")] ()
        , mknode "a:t" [] (show pgNum)
        ]
      , mknode "a:endParaRPr" [("lang", "en-US")] ()
      ]
    ]
  ]

slideToSpeakerNotesElement :: PandocMonad m => Slide -> P m (Maybe Element)
slideToSpeakerNotesElement slide
  | Slide _ _ mbNotes <- slide
  , Nothing <- mbNotes = return Nothing
  | Slide _ _ mbNotes <- slide
  , Just (SpeakerNotes paras) <- mbNotes = do
      master <- getNotesMaster
      fieldId  <- getSlideNumberFieldId master
      num <- slideNum slide
      let imgShape = speakerNotesSlideImage
          sldNumShape = speakerNotesSlideNumber num fieldId
      bodyShape <- speakerNotesBody paras
      return $ Just $
        mknode "p:notes"
        [ ("xmlns:a", "http://schemas.openxmlformats.org/drawingml/2006/main")
        , ("xmlns:r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships")
        , ("xmlns:p", "http://schemas.openxmlformats.org/presentationml/2006/main")
        ] [ mknode "p:cSld" []
            [ mknode "p:spTree" []
              [ mknode "p:nvGrpSpPr" []
                [ mknode "p:cNvPr" [("id", "1"), ("name", "")] ()
                , mknode "p:cNvGrpSpPr" [] ()
                , mknode "p:nvPr" [] ()
                ]
            , mknode "p:grpSpPr" []
              [ mknode "a:xfrm" []
                [ mknode "a:off" [("x", "0"), ("y", "0")] ()
                , mknode "a:ext" [("cx", "0"), ("cy", "0")] ()
                , mknode "a:chOff" [("x", "0"), ("y", "0")] ()
                , mknode "a:chExt" [("cx", "0"), ("cy", "0")] ()
                ]
              ]
            , imgShape
            , bodyShape
            , sldNumShape
            ]
            ]
          ]

-----------------------------------------------------------------------

getSlideIdNum :: PandocMonad m => SlideId -> P m Int
getSlideIdNum sldId = do
  slideIdMap <- asks envSlideIdMap
  case  M.lookup sldId slideIdMap of
    Just n -> return n
    Nothing -> throwError $
               PandocShouldNeverHappenError $
               "Slide Id " ++ (show sldId) ++ " not found."

slideNum :: PandocMonad m => Slide -> P m Int
slideNum slide = getSlideIdNum $ slideId slide

idNumToFilePath :: Int -> FilePath
idNumToFilePath idNum = "slide" ++ (show $ idNum) ++ ".xml"

slideToFilePath :: PandocMonad m => Slide -> P m FilePath
slideToFilePath slide = do
  idNum <- slideNum slide
  return $ "slide" ++ (show $ idNum) ++ ".xml"

slideToRelId :: PandocMonad m => Slide -> P m String
slideToRelId slide = do
  n <- slideNum slide
  offset <- asks envSlideIdOffset
  return $ "rId" ++ (show $ n + offset)


data Relationship = Relationship { relId :: Int
                                 , relType :: MimeType
                                 , relTarget :: FilePath
                                 } deriving (Show, Eq)

elementToRel :: Element -> Maybe Relationship
elementToRel element
  | elName element == QName "Relationship" (Just "http://schemas.openxmlformats.org/package/2006/relationships") Nothing =
      do rId <- findAttr (QName "Id" Nothing Nothing) element
         numStr <- stripPrefix "rId" rId
         num <- case reads numStr :: [(Int, String)] of
           (n, _) : _ -> Just n
           []         -> Nothing
         type' <- findAttr (QName "Type" Nothing Nothing) element
         target <- findAttr (QName "Target" Nothing Nothing) element
         return $ Relationship num type' target
  | otherwise = Nothing

slideToPresRel :: PandocMonad m => Slide -> P m Relationship
slideToPresRel slide = do
  idNum <- slideNum slide
  n <- asks envSlideIdOffset
  let rId = idNum + n
      fp = "slides/" ++ idNumToFilePath idNum
  return $ Relationship { relId = rId
                        , relType = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide"
                        , relTarget = fp
                        }

getRels :: PandocMonad m => P m [Relationship]
getRels = do
  refArchive <- asks envRefArchive
  distArchive <- asks envDistArchive
  relsElem <- parseXml refArchive distArchive "ppt/_rels/presentation.xml.rels"
  let globalNS = "http://schemas.openxmlformats.org/package/2006/relationships"
  let relElems = findChildren (QName "Relationship" (Just globalNS) Nothing) relsElem
  return $ mapMaybe elementToRel relElems

presentationToRels :: PandocMonad m => Presentation -> P m [Relationship]
presentationToRels (Presentation _ slides) = do
  mySlideRels <- mapM slideToPresRel slides
  rels <- getRels
  let relsWithoutSlides = filter (\r -> relType r /= "http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide") rels
  -- We want to make room for the slides in the id space. The slides
  -- will start at Id2 (since Id1 is for the slide master). There are
  -- two slides in the data file, but that might change in the future,
  -- so we will do this:
  --
  -- 1. We look to see what the minimum relWithoutSlide id (greater than 1) is.
  -- 2. We add the difference between this and the number of slides to
  -- all relWithoutSlide rels (unless they're 1)

  let minRelNotOne = case filter (1<) $ map relId relsWithoutSlides of
        [] -> 0                 -- doesn't matter in this case, since
                                -- there will be nothing to map the
                                -- function over
        l  -> minimum l

      modifyRelNum :: Int -> Int
      modifyRelNum 1 = 1
      modifyRelNum n = n - minRelNotOne + 2 + length slides

      relsWithoutSlides' = map (\r -> r{relId = modifyRelNum $ relId r}) relsWithoutSlides

  return $ mySlideRels ++ relsWithoutSlides'

-- We make this ourselves, in case there's a thumbnail in the one from
-- the template.
topLevelRels :: [Relationship]
topLevelRels =
  [ Relationship { relId = 1
                 , relType = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument"
                 , relTarget = "ppt/presentation.xml"
                 }
  , Relationship { relId = 2
                 , relType = "http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties"
                 , relTarget = "docProps/core.xml"
                 }
  , Relationship { relId = 3
                 , relType = "http://schemas.openxmlformats.org/package/2006/relationships/metadata/extended-properties"
                 , relTarget = "docProps/app.xml"
                 }
  ]

topLevelRelsEntry :: PandocMonad m => P m Entry
topLevelRelsEntry = elemToEntry "_rels/.rels" $ relsToElement topLevelRels

relToElement :: Relationship -> Element
relToElement rel = mknode "Relationship" [ ("Id", "rId" ++ (show $ relId rel))
                                         , ("Type", relType rel)
                                         , ("Target", relTarget rel) ] ()

relsToElement :: [Relationship] -> Element
relsToElement rels = mknode "Relationships"
                     [("xmlns", "http://schemas.openxmlformats.org/package/2006/relationships")]
                     (map relToElement rels)

presentationToRelsEntry :: PandocMonad m => Presentation -> P m Entry
presentationToRelsEntry pres = do
  rels <- presentationToRels pres
  elemToEntry "ppt/_rels/presentation.xml.rels" $ relsToElement rels

elemToEntry :: PandocMonad m => FilePath -> Element -> P m Entry
elemToEntry fp element = do
  epochtime <- (floor . utcTimeToPOSIXSeconds) <$> asks envUTCTime
  return $ toEntry fp epochtime $ renderXml element

slideToEntry :: PandocMonad m => Slide -> P m Entry
slideToEntry slide = do
  idNum <- slideNum slide
  local (\env -> env{envCurSlideId = idNum}) $ do
    element <- slideToElement slide
    elemToEntry ("ppt/slides/" ++ idNumToFilePath idNum) element

slideToSpeakerNotesEntry :: PandocMonad m => Slide -> P m (Maybe Entry)
slideToSpeakerNotesEntry slide = do
  idNum <- slideNum slide
  local (\env -> env{envCurSlideId = idNum}) $ do
    mbElement <- slideToSpeakerNotesElement slide
    mbNotesIdNum <- do mp <- asks envSpeakerNotesIdMap
                       return $ M.lookup idNum mp
    case mbElement of
      Just element | Just notesIdNum <- mbNotesIdNum ->
                       Just <$>
                       elemToEntry
                       ("ppt/notesSlides/notesSlide" ++ show notesIdNum ++ ".xml")
                       element
      _ -> return Nothing

slideToSpeakerNotesRelElement :: PandocMonad m => Slide -> P m (Maybe Element)
slideToSpeakerNotesRelElement slide
  | Slide _ _ mbNotes <- slide
  , Nothing <- mbNotes = return Nothing
  | Slide _ _ mbNotes <- slide
  , Just _ <- mbNotes = do
      idNum <- slideNum slide
      return $ Just $
        mknode "Relationships"
        [("xmlns", "http://schemas.openxmlformats.org/package/2006/relationships")]
        [ mknode "Relationship" [ ("Id", "rId2")
                                , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide")
                                , ("Target", "../slides/slide" ++ show idNum ++ ".xml")
                                ] ()
        , mknode "Relationship" [ ("Id", "rId1")
                                , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/notesMaster")
                                , ("Target", "../notesMasters/notesMaster1.xml")
                                ] ()
        ]

slideToSpeakerNotesRelEntry :: PandocMonad m => Slide -> P m (Maybe Entry)
slideToSpeakerNotesRelEntry slide = do
  idNum <- slideNum slide
  mbElement <- slideToSpeakerNotesRelElement slide
  mp <- asks envSpeakerNotesIdMap
  let mbNotesIdNum = M.lookup idNum mp
  case mbElement of
    Just element | Just notesIdNum <- mbNotesIdNum ->
      Just <$>
      elemToEntry
      ("ppt/notesSlides/_rels/notesSlide" ++ show notesIdNum ++ ".xml.rels")
      element
    _ -> return Nothing

slideToSlideRelEntry :: PandocMonad m => Slide -> P m Entry
slideToSlideRelEntry slide = do
  idNum <- slideNum slide
  element <- slideToSlideRelElement slide
  elemToEntry ("ppt/slides/_rels/" ++ idNumToFilePath idNum ++ ".rels") element

linkRelElement :: PandocMonad m => Int -> LinkTarget -> P m Element
linkRelElement rIdNum (InternalTarget targetId) = do
  targetIdNum <- getSlideIdNum targetId
  return $
    mknode "Relationship" [ ("Id", "rId" ++ show rIdNum)
                          , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide")
                          , ("Target", "slide" ++ show targetIdNum ++ ".xml")
                          ] ()
linkRelElement rIdNum (ExternalTarget (url, _)) = do
  return $
    mknode "Relationship" [ ("Id", "rId" ++ show rIdNum)
                          , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink")
                          , ("Target", url)
                          , ("TargetMode", "External")
                          ] ()

linkRelElements :: PandocMonad m => M.Map Int LinkTarget -> P m [Element]
linkRelElements mp = mapM (\(n, lnk) -> linkRelElement n lnk) (M.toList mp)

mediaRelElement :: MediaInfo -> Element
mediaRelElement mInfo =
  let ext = case mInfoExt mInfo of
              Just e -> e
              Nothing -> ""
  in
    mknode "Relationship" [ ("Id", "rId" ++ (show $ mInfoLocalId mInfo))
                          , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/image")
                          , ("Target", "../media/image" ++ (show $ mInfoGlobalId mInfo) ++ ext)
                          ] ()

speakerNotesSlideRelElement :: PandocMonad m => Slide -> P m (Maybe Element)
speakerNotesSlideRelElement slide = do
  idNum <- slideNum slide
  mp <- asks envSpeakerNotesIdMap
  return $ case M.lookup idNum mp of
    Nothing -> Nothing
    Just n ->
      let target = "../notesSlides/notesSlide" ++ show n ++ ".xml"
      in Just $
         mknode "Relationship" [ ("Id", "rId2")
                               , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/notesSlide")
                               , ("Target", target)
                               ] ()

slideToSlideRelElement :: PandocMonad m => Slide -> P m Element
slideToSlideRelElement slide = do
  idNum <- slideNum slide
  let target =  case slide of
        (Slide _ (MetadataSlide _ _ _ _) _) -> "../slideLayouts/slideLayout1.xml"
        (Slide _ (TitleSlide _) _)          -> "../slideLayouts/slideLayout3.xml"
        (Slide _ (ContentSlide _ _) _)      -> "../slideLayouts/slideLayout2.xml"
        (Slide _ (TwoColumnSlide _ _ _) _)  -> "../slideLayouts/slideLayout4.xml"

  speakerNotesRels <- maybeToList <$> speakerNotesSlideRelElement slide

  linkIds <- gets stLinkIds
  mediaIds <- gets stMediaIds

  linkRels <- case M.lookup idNum linkIds of
                Just mp -> linkRelElements mp
                Nothing -> return []
  let mediaRels = case M.lookup idNum mediaIds of
                   Just mInfos -> map mediaRelElement mInfos
                   Nothing -> []

  return $
    mknode "Relationships"
    [("xmlns", "http://schemas.openxmlformats.org/package/2006/relationships")]
    ([mknode "Relationship" [ ("Id", "rId1")
                           , ("Type", "http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideLayout")
                           , ("Target", target)] ()
    ] ++ speakerNotesRels ++ linkRels ++ mediaRels)

slideToSldIdElement :: PandocMonad m => Slide -> P m Element
slideToSldIdElement slide = do
  n <- slideNum slide
  let id' = show $ n + 255
  rId <- slideToRelId slide
  return $ mknode "p:sldId" [("id", id'), ("r:id", rId)] ()

presentationToSldIdLst :: PandocMonad m => Presentation -> P m Element
presentationToSldIdLst (Presentation _ slides) = do
  ids <- mapM slideToSldIdElement slides
  return $ mknode "p:sldIdLst" [] ids

presentationToPresentationElement :: PandocMonad m => Presentation -> P m Element
presentationToPresentationElement pres@(Presentation _ slds) = do
  refArchive <- asks envRefArchive
  distArchive <- asks envDistArchive
  element <- parseXml refArchive distArchive "ppt/presentation.xml"
  sldIdLst <- presentationToSldIdLst pres

  let modifySldIdLst :: Content -> Content
      modifySldIdLst (Elem e) = case elName e of
        (QName "sldIdLst" _ _) -> Elem sldIdLst
        _                      -> Elem e
      modifySldIdLst ct = ct

      notesMasterRId = length slds + 2

      modifySpeakerNotes' :: Content -> [Content]
      modifySpeakerNotes' (Elem e) = case elName e of
        (QName "notesMasterIdLst" _ _) ->
          if presHasSpeakerNotes pres
          then [Elem $
                 mknode "p:notesMasterIdLst" []
                 [ mknode
                   "p:NotesMasterId"
                   [("r:id", "rId" ++ show notesMasterRId)]
                   ()
                 ]
               ]
          else []
        _ -> [Elem e]
      modifySpeakerNotes' ct = [ct]

      modifySpeakerNotes :: [Content] -> [Content]
      modifySpeakerNotes = concatMap modifySpeakerNotes'

      newContent = modifySpeakerNotes $ map modifySldIdLst $ elContent element

  return $ element{elContent = newContent}

presentationToPresEntry :: PandocMonad m => Presentation -> P m Entry
presentationToPresEntry pres = presentationToPresentationElement pres >>=
  elemToEntry "ppt/presentation.xml"

-- adapted from the Docx writer
docPropsElement :: PandocMonad m => DocProps -> P m Element
docPropsElement docProps = do
  utctime <- asks envUTCTime
  let keywords = case dcKeywords docProps of
        Just xs -> intercalate "," xs
        Nothing -> ""
  return $
    mknode "cp:coreProperties"
    [("xmlns:cp","http://schemas.openxmlformats.org/package/2006/metadata/core-properties")
    ,("xmlns:dc","http://purl.org/dc/elements/1.1/")
    ,("xmlns:dcterms","http://purl.org/dc/terms/")
    ,("xmlns:dcmitype","http://purl.org/dc/dcmitype/")
    ,("xmlns:xsi","http://www.w3.org/2001/XMLSchema-instance")]
    $ (mknode "dc:title" [] $ fromMaybe "" $ dcTitle docProps)
    : (mknode "dc:creator" [] $ fromMaybe "" $ dcCreator docProps)
    : (mknode "cp:keywords" [] keywords)
    : (\x -> [ mknode "dcterms:created" [("xsi:type","dcterms:W3CDTF")] x
             , mknode "dcterms:modified" [("xsi:type","dcterms:W3CDTF")] x
             ]) (formatTime defaultTimeLocale "%FT%XZ" utctime)

docPropsToEntry :: PandocMonad m => DocProps -> P m Entry
docPropsToEntry docProps = docPropsElement docProps >>=
                           elemToEntry "docProps/core.xml"


defaultContentTypeToElem :: DefaultContentType -> Element
defaultContentTypeToElem dct =
  mknode "Default"
  [("Extension", defContentTypesExt dct),
    ("ContentType", defContentTypesType dct)]
  ()

overrideContentTypeToElem :: OverrideContentType -> Element
overrideContentTypeToElem oct =
  mknode "Override"
  [("PartName", overrideContentTypesPart oct),
    ("ContentType", overrideContentTypesType oct)]
  ()

contentTypesToElement :: ContentTypes -> Element
contentTypesToElement ct =
  let ns = "http://schemas.openxmlformats.org/package/2006/content-types"
  in
    mknode "Types" [("xmlns", ns)] $
    (map defaultContentTypeToElem $ contentTypesDefaults ct) ++
    (map overrideContentTypeToElem $ contentTypesOverrides ct)

data DefaultContentType = DefaultContentType
                           { defContentTypesExt :: String
                           , defContentTypesType:: MimeType
                           }
                         deriving (Show, Eq)

data OverrideContentType = OverrideContentType
                           { overrideContentTypesPart :: FilePath
                           , overrideContentTypesType :: MimeType
                           }
                          deriving (Show, Eq)

data ContentTypes = ContentTypes { contentTypesDefaults :: [DefaultContentType]
                                 , contentTypesOverrides :: [OverrideContentType]
                                 }
                    deriving (Show, Eq)

contentTypesToEntry :: PandocMonad m => ContentTypes -> P m Entry
contentTypesToEntry ct = elemToEntry "[Content_Types].xml" $ contentTypesToElement ct

pathToOverride :: FilePath -> Maybe OverrideContentType
pathToOverride fp = OverrideContentType ("/" ++ fp) <$> (getContentType fp)

mediaFileContentType :: FilePath -> Maybe DefaultContentType
mediaFileContentType fp = case takeExtension fp of
  '.' : ext -> Just $
               DefaultContentType { defContentTypesExt = ext
                                  , defContentTypesType =
                                      case getMimeType fp of
                                        Just mt -> mt
                                        Nothing -> "application/octet-stream"
                                  }
  _ -> Nothing

mediaContentType :: MediaInfo -> Maybe DefaultContentType
mediaContentType mInfo
  | Just ('.' : ext) <- mInfoExt mInfo =
      Just $ DefaultContentType { defContentTypesExt = ext
                                , defContentTypesType =
                                    case mInfoMimeType mInfo of
                                      Just mt -> mt
                                      Nothing -> "application/octet-stream"
                                }
  | otherwise = Nothing

getSpeakerNotesFilePaths :: PandocMonad m => P m [FilePath]
getSpeakerNotesFilePaths = do
  mp <- asks envSpeakerNotesIdMap
  let notesIdNums = M.elems mp
  return $ map (\n -> "ppt/notesSlides/notesSlide" ++ show n ++ ".xml") notesIdNums

presentationToContentTypes :: PandocMonad m => Presentation -> P m ContentTypes
presentationToContentTypes p@(Presentation _ slides) = do
  mediaInfos <- (mconcat . M.elems) <$> gets stMediaIds
  filePaths <- patternsToFilePaths $ inheritedPatterns p
  let mediaFps = filter (match (compile "ppt/media/image*")) filePaths
  let defaults = [ DefaultContentType "xml" "application/xml"
                 , DefaultContentType "rels" "application/vnd.openxmlformats-package.relationships+xml"
                 ]
      mediaDefaults = nub $
                      (mapMaybe mediaContentType $ mediaInfos) ++
                      (mapMaybe mediaFileContentType $ mediaFps)

      inheritedOverrides = mapMaybe pathToOverride filePaths
      docPropsOverride = mapMaybe pathToOverride ["docProps/core.xml"]
      presOverride = mapMaybe pathToOverride ["ppt/presentation.xml"]
  relativePaths <- mapM slideToFilePath slides
  let slideOverrides = mapMaybe
                       (\fp -> pathToOverride $ "ppt/slides/" ++ fp)
                       relativePaths
  speakerNotesOverrides <- (mapMaybe pathToOverride) <$> getSpeakerNotesFilePaths
  return $ ContentTypes
    (defaults ++ mediaDefaults)
    (inheritedOverrides ++ docPropsOverride ++ presOverride ++ slideOverrides ++ speakerNotesOverrides)

presML :: String
presML = "application/vnd.openxmlformats-officedocument.presentationml"

noPresML :: String
noPresML = "application/vnd.openxmlformats-officedocument"

getContentType :: FilePath -> Maybe MimeType
getContentType fp
  | fp == "ppt/presentation.xml" = Just $ presML ++ ".presentation.main+xml"
  | fp == "ppt/presProps.xml" = Just $ presML ++ ".presProps+xml"
  | fp == "ppt/viewProps.xml" = Just $ presML ++ ".viewProps+xml"
  | fp == "ppt/tableStyles.xml" = Just $ presML ++ ".tableStyles+xml"
  | fp == "docProps/core.xml" = Just $ "application/vnd.openxmlformats-package.core-properties+xml"
  | fp == "docProps/app.xml" = Just $ noPresML ++ ".extended-properties+xml"
  | "ppt" : "slideMasters" : f : [] <- splitDirectories fp
  , (_, ".xml") <- splitExtension f =
      Just $ presML ++ ".slideMaster+xml"
  | "ppt" : "slides" : f : [] <- splitDirectories fp
  , (_, ".xml") <- splitExtension f =
      Just $ presML ++ ".slide+xml"
  | "ppt" : "notesMasters"  : f : [] <- splitDirectories fp
  , (_, ".xml") <- splitExtension f =
      Just $ presML ++ ".notesMaster+xml"
  | "ppt" : "notesSlides"  : f : [] <- splitDirectories fp
  , (_, ".xml") <- splitExtension f =
      Just $ presML ++ ".notesSlide+xml"
  | "ppt" : "theme" : f : [] <- splitDirectories fp
  , (_, ".xml") <- splitExtension f =
      Just $ noPresML ++ ".theme+xml"
  | "ppt" : "slideLayouts" : _ : [] <- splitDirectories fp=
      Just $ presML ++ ".slideLayout+xml"
  | otherwise = Nothing

autoNumberingToType :: ListAttributes -> String
autoNumberingToType (_, numStyle, numDelim) =
  typeString ++ delimString
  where
    typeString = case numStyle of
      Decimal -> "arabic"
      UpperAlpha -> "alphaUc"
      LowerAlpha -> "alphaLc"
      UpperRoman -> "romanUc"
      LowerRoman -> "romanLc"
      _          -> "arabic"
    delimString = case numDelim of
      Period -> "Period"
      OneParen -> "ParenR"
      TwoParens -> "ParenBoth"
      _         -> "Period"