summaryrefslogtreecommitdiffstats
path: root/models/issue.go
blob: 326454630e5cef1b0b03a0088d93495344c215dc (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
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package models

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"mime/multipart"
	"os"
	"path"
	"strings"
	"time"

	"github.com/Unknwon/com"
	"github.com/go-xorm/xorm"

	"github.com/gogits/gogs/modules/base"
	"github.com/gogits/gogs/modules/log"
	"github.com/gogits/gogs/modules/setting"
	gouuid "github.com/gogits/gogs/modules/uuid"
)

var (
	ErrWrongIssueCounter   = errors.New("Invalid number of issues for this milestone")
	ErrAttachmentNotLinked = errors.New("Attachment does not belong to this issue")
	ErrMissingIssueNumber  = errors.New("No issue number specified")
)

// Issue represents an issue or pull request of repository.
type Issue struct {
	ID              int64 `xorm:"pk autoincr"`
	RepoID          int64 `xorm:"INDEX"`
	Index           int64 // Index in one repository.
	Name            string
	Repo            *Repository `xorm:"-"`
	PosterID        int64
	Poster          *User    `xorm:"-"`
	Labels          []*Label `xorm:"-"`
	MilestoneID     int64
	Milestone       *Milestone `xorm:"-"`
	AssigneeID      int64
	Assignee        *User `xorm:"-"`
	IsRead          bool  `xorm:"-"`
	IsPull          bool  // Indicates whether is a pull request or not.
	*PullRequest    `xorm:"-"`
	IsClosed        bool
	Content         string `xorm:"TEXT"`
	RenderedContent string `xorm:"-"`
	Priority        int
	NumComments     int
	Deadline        time.Time
	Created         time.Time `xorm:"CREATED"`
	Updated         time.Time `xorm:"UPDATED"`

	Attachments []*Attachment `xorm:"-"`
	Comments    []*Comment    `xorm:"-"`
}

func (i *Issue) AfterSet(colName string, _ xorm.Cell) {
	var err error
	switch colName {
	case "id":
		i.Attachments, err = GetAttachmentsByIssueID(i.ID)
		if err != nil {
			log.Error(3, "GetAttachmentsByIssueID[%d]: %v", i.ID, err)
		}

		i.Comments, err = GetCommentsByIssueID(i.ID)
		if err != nil {
			log.Error(3, "GetCommentsByIssueID[%d]: %v", i.ID, err)
		}

	case "milestone_id":
		if i.MilestoneID == 0 {
			return
		}

		i.Milestone, err = GetMilestoneByID(i.MilestoneID)
		if err != nil {
			log.Error(3, "GetMilestoneById[%d]: %v", i.ID, err)
		}
	case "assignee_id":
		if i.AssigneeID == 0 {
			return
		}

		i.Assignee, err = GetUserByID(i.AssigneeID)
		if err != nil {
			log.Error(3, "GetUserByID[%d]: %v", i.ID, err)
		}
	case "created":
		i.Created = regulateTimeZone(i.Created)
	}
}

// HashTag returns unique hash tag for issue.
func (i *Issue) HashTag() string {
	return "issue-" + com.ToStr(i.ID)
}

// IsPoster returns true if given user by ID is the poster.
func (i *Issue) IsPoster(uid int64) bool {
	return i.PosterID == uid
}

func (i *Issue) GetPoster() (err error) {
	i.Poster, err = GetUserByID(i.PosterID)
	if IsErrUserNotExist(err) {
		i.PosterID = -1
		i.Poster = NewFakeUser()
		return nil
	}
	return err
}

func (i *Issue) hasLabel(e Engine, labelID int64) bool {
	return hasIssueLabel(e, i.ID, labelID)
}

// HasLabel returns true if issue has been labeled by given ID.
func (i *Issue) HasLabel(labelID int64) bool {
	return i.hasLabel(x, labelID)
}

func (i *Issue) addLabel(e *xorm.Session, label *Label) error {
	return newIssueLabel(e, i, label)
}

// AddLabel adds new label to issue by given ID.
func (i *Issue) AddLabel(label *Label) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = i.addLabel(sess, label); err != nil {
		return err
	}

	return sess.Commit()
}

func (i *Issue) getLabels(e Engine) (err error) {
	if len(i.Labels) > 0 {
		return nil
	}

	i.Labels, err = getLabelsByIssueID(e, i.ID)
	if err != nil {
		return fmt.Errorf("getLabelsByIssueID: %v", err)
	}
	return nil
}

// GetLabels retrieves all labels of issue and assign to corresponding field.
func (i *Issue) GetLabels() error {
	return i.getLabels(x)
}

func (i *Issue) removeLabel(e *xorm.Session, label *Label) error {
	return deleteIssueLabel(e, i, label)
}

// RemoveLabel removes a label from issue by given ID.
func (i *Issue) RemoveLabel(label *Label) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = i.removeLabel(sess, label); err != nil {
		return err
	}

	return sess.Commit()
}

func (i *Issue) ClearLabels() (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = i.getLabels(sess); err != nil {
		return err
	}

	for idx := range i.Labels {
		if err = i.removeLabel(sess, i.Labels[idx]); err != nil {
			return err
		}
	}

	return sess.Commit()
}

func (i *Issue) GetAssignee() (err error) {
	if i.AssigneeID == 0 || i.Assignee != nil {
		return nil
	}

	i.Assignee, err = GetUserByID(i.AssigneeID)
	if IsErrUserNotExist(err) {
		return nil
	}
	return err
}

// ReadBy sets issue to be read by given user.
func (i *Issue) ReadBy(uid int64) error {
	return UpdateIssueUserByRead(uid, i.ID)
}

func (i *Issue) changeStatus(e *xorm.Session, doer *User, isClosed bool) (err error) {
	if i.IsClosed == isClosed {
		return nil
	}
	i.IsClosed = isClosed

	if err = updateIssueCols(e, i, "is_closed"); err != nil {
		return err
	} else if err = updateIssueUsersByStatus(e, i.ID, isClosed); err != nil {
		return err
	}

	// Update labels.
	if err = i.getLabels(e); err != nil {
		return err
	}
	for idx := range i.Labels {
		if i.IsClosed {
			i.Labels[idx].NumClosedIssues++
		} else {
			i.Labels[idx].NumClosedIssues--
		}
		if err = updateLabel(e, i.Labels[idx]); err != nil {
			return err
		}
	}

	// Update milestone.
	if err = changeMilestoneIssueStats(e, i); err != nil {
		return err
	}

	// New action comment.
	if _, err = createStatusComment(e, doer, i.Repo, i); err != nil {
		return err
	}

	return nil
}

// ChangeStatus changes issue status to open/closed.
func (i *Issue) ChangeStatus(doer *User, isClosed bool) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = i.changeStatus(sess, doer, isClosed); err != nil {
		return err
	}

	return sess.Commit()
}

func (i *Issue) GetPullRequest() (err error) {
	if i.PullRequest != nil {
		return nil
	}

	i.PullRequest, err = GetPullRequestByIssueID(i.ID)
	return err
}

// It's caller's responsibility to create action.
func newIssue(e *xorm.Session, repo *Repository, issue *Issue, labelIDs []int64, uuids []string, isPull bool) (err error) {
	if _, err = e.Insert(issue); err != nil {
		return err
	}

	if isPull {
		_, err = e.Exec("UPDATE `repository` SET num_pulls=num_pulls+1 WHERE id=?", issue.RepoID)
	} else {
		_, err = e.Exec("UPDATE `repository` SET num_issues=num_issues+1 WHERE id=?", issue.RepoID)
	}
	if err != nil {
		return err
	}

	var label *Label
	for _, id := range labelIDs {
		if id == 0 {
			continue
		}

		label, err = getLabelByID(e, id)
		if err != nil {
			return err
		}
		if err = issue.addLabel(e, label); err != nil {
			return fmt.Errorf("addLabel: %v", err)
		}

	}

	if issue.MilestoneID > 0 {
		if err = changeMilestoneAssign(e, 0, issue); err != nil {
			return err
		}
	}

	if err = newIssueUsers(e, repo, issue); err != nil {
		return err
	}

	// Check attachments.
	attachments := make([]*Attachment, 0, len(uuids))
	for _, uuid := range uuids {
		attach, err := getAttachmentByUUID(e, uuid)
		if err != nil {
			if IsErrAttachmentNotExist(err) {
				continue
			}
			return fmt.Errorf("getAttachmentByUUID[%s]: %v", uuid, err)
		}
		attachments = append(attachments, attach)
	}

	for i := range attachments {
		attachments[i].IssueID = issue.ID
		// No assign value could be 0, so ignore AllCols().
		if _, err = e.Id(attachments[i].ID).Update(attachments[i]); err != nil {
			return fmt.Errorf("update attachment[%d]: %v", attachments[i].ID, err)
		}
	}

	return nil
}

// NewIssue creates new issue with labels for repository.
func NewIssue(repo *Repository, issue *Issue, labelIDs []int64, uuids []string) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = newIssue(sess, repo, issue, labelIDs, uuids, false); err != nil {
		return fmt.Errorf("newIssue: %v", err)
	}

	// Notify watchers.
	act := &Action{
		ActUserID:    issue.Poster.Id,
		ActUserName:  issue.Poster.Name,
		ActEmail:     issue.Poster.Email,
		OpType:       CREATE_ISSUE,
		Content:      fmt.Sprintf("%d|%s", issue.Index, issue.Name),
		RepoID:       repo.ID,
		RepoUserName: repo.Owner.Name,
		RepoName:     repo.Name,
		IsPrivate:    repo.IsPrivate,
	}
	if err = notifyWatchers(sess, act); err != nil {
		return err
	}

	return sess.Commit()
}

// GetIssueByRef returns an Issue specified by a GFM reference.
// See https://help.github.com/articles/writing-on-github#references for more information on the syntax.
func GetIssueByRef(ref string) (*Issue, error) {
	n := strings.IndexByte(ref, byte('#'))
	if n == -1 {
		return nil, ErrMissingIssueNumber
	}

	index, err := com.StrTo(ref[n+1:]).Int64()
	if err != nil {
		return nil, err
	}

	repo, err := GetRepositoryByRef(ref[:n])
	if err != nil {
		return nil, err
	}

	issue, err := GetIssueByIndex(repo.ID, index)
	if err != nil {
		return nil, err
	}

	issue.Repo = repo
	return issue, nil
}

// GetIssueByIndex returns issue by given index in repository.
func GetIssueByIndex(repoID, index int64) (*Issue, error) {
	issue := &Issue{
		RepoID: repoID,
		Index:  index,
	}
	has, err := x.Get(issue)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrIssueNotExist{0, repoID, index}
	}
	return issue, nil
}

// GetIssueByID returns an issue by given ID.
func GetIssueByID(id int64) (*Issue, error) {
	issue := new(Issue)
	has, err := x.Id(id).Get(issue)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrIssueNotExist{id, 0, 0}
	}
	return issue, nil
}

type IssuesOptions struct {
	UserID      int64
	AssigneeID  int64
	RepoID      int64
	PosterID    int64
	MilestoneID int64
	RepoIDs     []int64
	Page        int
	IsClosed    bool
	IsMention   bool
	IsPull      bool
	Labels      string
	SortType    string
}

// Issues returns a list of issues by given conditions.
func Issues(opts *IssuesOptions) ([]*Issue, error) {
	sess := x.Limit(setting.IssuePagingNum, (opts.Page-1)*setting.IssuePagingNum)

	if opts.RepoID > 0 {
		sess.Where("issue.repo_id=?", opts.RepoID).And("issue.is_closed=?", opts.IsClosed)
	} else if opts.RepoIDs != nil {
		// In case repository IDs are provided but actually no repository has issue.
		if len(opts.RepoIDs) == 0 {
			return make([]*Issue, 0), nil
		}
		sess.Where("issue.repo_id IN ("+strings.Join(base.Int64sToStrings(opts.RepoIDs), ",")+")").And("issue.is_closed=?", opts.IsClosed)
	} else {
		sess.Where("issue.is_closed=?", opts.IsClosed)
	}

	if opts.AssigneeID > 0 {
		sess.And("issue.assignee_id=?", opts.AssigneeID)
	} else if opts.PosterID > 0 {
		sess.And("issue.poster_id=?", opts.PosterID)
	}

	if opts.MilestoneID > 0 {
		sess.And("issue.milestone_id=?", opts.MilestoneID)
	}

	sess.And("issue.is_pull=?", opts.IsPull)

	switch opts.SortType {
	case "oldest":
		sess.Asc("created")
	case "recentupdate":
		sess.Desc("updated")
	case "leastupdate":
		sess.Asc("updated")
	case "mostcomment":
		sess.Desc("num_comments")
	case "leastcomment":
		sess.Asc("num_comments")
	case "priority":
		sess.Desc("priority")
	default:
		sess.Desc("created")
	}

	labelIDs := base.StringsToInt64s(strings.Split(opts.Labels, ","))
	if len(labelIDs) > 0 {
		validJoin := false
		queryStr := "issue.id=issue_label.issue_id"
		for _, id := range labelIDs {
			if id == 0 {
				continue
			}
			validJoin = true
			queryStr += " AND issue_label.label_id=" + com.ToStr(id)
		}
		if validJoin {
			sess.Join("INNER", "issue_label", queryStr)
		}
	}

	if opts.IsMention {
		queryStr := "issue.id=issue_user.issue_id AND issue_user.is_mentioned=1"
		if opts.UserID > 0 {
			queryStr += " AND issue_user.uid=" + com.ToStr(opts.UserID)
		}
		sess.Join("INNER", "issue_user", queryStr)
	}

	issues := make([]*Issue, 0, setting.IssuePagingNum)
	return issues, sess.Find(&issues)
}

type IssueStatus int

const (
	IS_OPEN = iota + 1
	IS_CLOSE
)

// GetIssueCountByPoster returns number of issues of repository by poster.
func GetIssueCountByPoster(uid, rid int64, isClosed bool) int64 {
	count, _ := x.Where("repo_id=?", rid).And("poster_id=?", uid).And("is_closed=?", isClosed).Count(new(Issue))
	return count
}

// .___                             ____ ___
// |   | ______ ________ __   ____ |    |   \______ ___________
// |   |/  ___//  ___/  |  \_/ __ \|    |   /  ___// __ \_  __ \
// |   |\___ \ \___ \|  |  /\  ___/|    |  /\___ \\  ___/|  | \/
// |___/____  >____  >____/  \___  >______//____  >\___  >__|
//          \/     \/            \/             \/     \/

// IssueUser represents an issue-user relation.
type IssueUser struct {
	ID          int64 `xorm:"pk autoincr"`
	UID         int64 `xorm:"INDEX"` // User ID.
	IssueID     int64
	RepoID      int64 `xorm:"INDEX"`
	MilestoneID int64
	IsRead      bool
	IsAssigned  bool
	IsMentioned bool
	IsPoster    bool
	IsClosed    bool
}

func newIssueUsers(e *xorm.Session, repo *Repository, issue *Issue) error {
	users, err := repo.GetAssignees()
	if err != nil {
		return err
	}

	iu := &IssueUser{
		IssueID: issue.ID,
		RepoID:  repo.ID,
	}

	// Poster can be anyone.
	isNeedAddPoster := true
	for _, u := range users {
		iu.ID = 0
		iu.UID = u.Id
		iu.IsPoster = iu.UID == issue.PosterID
		if isNeedAddPoster && iu.IsPoster {
			isNeedAddPoster = false
		}
		iu.IsAssigned = iu.UID == issue.AssigneeID
		if _, err = e.Insert(iu); err != nil {
			return err
		}
	}
	if isNeedAddPoster {
		iu.ID = 0
		iu.UID = issue.PosterID
		iu.IsPoster = true
		if _, err = e.Insert(iu); err != nil {
			return err
		}
	}
	return nil
}

// NewIssueUsers adds new issue-user relations for new issue of repository.
func NewIssueUsers(repo *Repository, issue *Issue) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = newIssueUsers(sess, repo, issue); err != nil {
		return err
	}

	return sess.Commit()
}

// PairsContains returns true when pairs list contains given issue.
func PairsContains(ius []*IssueUser, issueId, uid int64) int {
	for i := range ius {
		if ius[i].IssueID == issueId &&
			ius[i].UID == uid {
			return i
		}
	}
	return -1
}

// GetIssueUsers returns issue-user pairs by given repository and user.
func GetIssueUsers(rid, uid int64, isClosed bool) ([]*IssueUser, error) {
	ius := make([]*IssueUser, 0, 10)
	err := x.Where("is_closed=?", isClosed).Find(&ius, &IssueUser{RepoID: rid, UID: uid})
	return ius, err
}

// GetIssueUserPairsByRepoIds returns issue-user pairs by given repository IDs.
func GetIssueUserPairsByRepoIds(rids []int64, isClosed bool, page int) ([]*IssueUser, error) {
	if len(rids) == 0 {
		return []*IssueUser{}, nil
	}

	buf := bytes.NewBufferString("")
	for _, rid := range rids {
		buf.WriteString("repo_id=")
		buf.WriteString(com.ToStr(rid))
		buf.WriteString(" OR ")
	}
	cond := strings.TrimSuffix(buf.String(), " OR ")
	ius := make([]*IssueUser, 0, 10)
	sess := x.Limit(20, (page-1)*20).Where("is_closed=?", isClosed)
	if len(cond) > 0 {
		sess.And(cond)
	}
	err := sess.Find(&ius)
	return ius, err
}

// GetIssueUserPairsByMode returns issue-user pairs by given repository and user.
func GetIssueUserPairsByMode(uid, rid int64, isClosed bool, page, filterMode int) ([]*IssueUser, error) {
	ius := make([]*IssueUser, 0, 10)
	sess := x.Limit(20, (page-1)*20).Where("uid=?", uid).And("is_closed=?", isClosed)
	if rid > 0 {
		sess.And("repo_id=?", rid)
	}

	switch filterMode {
	case FM_ASSIGN:
		sess.And("is_assigned=?", true)
	case FM_CREATE:
		sess.And("is_poster=?", true)
	default:
		return ius, nil
	}
	err := sess.Find(&ius)
	return ius, err
}

func UpdateMentions(userNames []string, issueId int64) error {
	for i := range userNames {
		userNames[i] = strings.ToLower(userNames[i])
	}
	users := make([]*User, 0, len(userNames))

	if err := x.Where("lower_name IN (?)", strings.Join(userNames, "\",\"")).OrderBy("lower_name ASC").Find(&users); err != nil {
		return err
	}

	ids := make([]int64, 0, len(userNames))
	for _, user := range users {
		ids = append(ids, user.Id)
		if !user.IsOrganization() {
			continue
		}

		if user.NumMembers == 0 {
			continue
		}

		tempIds := make([]int64, 0, user.NumMembers)
		orgUsers, err := GetOrgUsersByOrgId(user.Id)
		if err != nil {
			return err
		}

		for _, orgUser := range orgUsers {
			tempIds = append(tempIds, orgUser.ID)
		}

		ids = append(ids, tempIds...)
	}

	if err := UpdateIssueUsersByMentions(ids, issueId); err != nil {
		return err
	}

	return nil
}

// IssueStats represents issue statistic information.
type IssueStats struct {
	OpenCount, ClosedCount int64
	AllCount               int64
	AssignCount            int64
	CreateCount            int64
	MentionCount           int64
}

// Filter modes.
const (
	FM_ALL = iota
	FM_ASSIGN
	FM_CREATE
	FM_MENTION
)

func parseCountResult(results []map[string][]byte) int64 {
	if len(results) == 0 {
		return 0
	}
	for _, result := range results[0] {
		return com.StrTo(string(result)).MustInt64()
	}
	return 0
}

type IssueStatsOptions struct {
	RepoID      int64
	UserID      int64
	LabelID     int64
	MilestoneID int64
	AssigneeID  int64
	FilterMode  int
	IsPull      bool
}

// GetIssueStats returns issue statistic information by given conditions.
func GetIssueStats(opts *IssueStatsOptions) *IssueStats {
	stats := &IssueStats{}

	queryStr := "SELECT COUNT(*) FROM `issue` "
	if opts.LabelID > 0 {
		queryStr += "INNER JOIN `issue_label` ON `issue`.id=`issue_label`.issue_id AND `issue_label`.label_id=" + com.ToStr(opts.LabelID)
	}

	baseCond := " WHERE issue.repo_id=" + com.ToStr(opts.RepoID) + " AND issue.is_closed=?"
	if opts.MilestoneID > 0 {
		baseCond += " AND issue.milestone_id=" + com.ToStr(opts.MilestoneID)
	}
	if opts.AssigneeID > 0 {
		baseCond += " AND assignee_id=" + com.ToStr(opts.AssigneeID)
	}
	baseCond += " AND issue.is_pull=?"

	switch opts.FilterMode {
	case FM_ALL, FM_ASSIGN:
		results, _ := x.Query(queryStr+baseCond, false, opts.IsPull)
		stats.OpenCount = parseCountResult(results)
		results, _ = x.Query(queryStr+baseCond, true, opts.IsPull)
		stats.ClosedCount = parseCountResult(results)

	case FM_CREATE:
		baseCond += " AND poster_id=?"
		results, _ := x.Query(queryStr+baseCond, false, opts.IsPull, opts.UserID)
		stats.OpenCount = parseCountResult(results)
		results, _ = x.Query(queryStr+baseCond, true, opts.IsPull, opts.UserID)
		stats.ClosedCount = parseCountResult(results)

	case FM_MENTION:
		queryStr += " INNER JOIN `issue_user` ON `issue`.id=`issue_user`.issue_id"
		baseCond += " AND `issue_user`.uid=? AND `issue_user`.is_mentioned=?"
		results, _ := x.Query(queryStr+baseCond, false, opts.IsPull, opts.UserID, true)
		stats.OpenCount = parseCountResult(results)
		results, _ = x.Query(queryStr+baseCond, true, opts.IsPull, opts.UserID, true)
		stats.ClosedCount = parseCountResult(results)
	}
	return stats
}

// GetUserIssueStats returns issue statistic information for dashboard by given conditions.
func GetUserIssueStats(repoID, uid int64, repoIDs []int64, filterMode int, isPull bool) *IssueStats {
	stats := &IssueStats{}

	queryStr := "SELECT COUNT(*) FROM `issue` "
	baseCond := " WHERE issue.is_closed=?"
	if repoID > 0 || len(repoIDs) == 0 {
		baseCond += " AND issue.repo_id=" + com.ToStr(repoID)
	} else {
		baseCond += " AND issue.repo_id IN (" + strings.Join(base.Int64sToStrings(repoIDs), ",") + ")"
	}

	if isPull {
		baseCond += " AND issue.is_pull=1"
	} else {
		baseCond += " AND issue.is_pull=0"
	}

	results, _ := x.Query(queryStr+baseCond+" AND assignee_id=?", false, uid)
	stats.AssignCount = parseCountResult(results)
	results, _ = x.Query(queryStr+baseCond+" AND poster_id=?", false, uid)
	stats.CreateCount = parseCountResult(results)

	switch filterMode {
	case FM_ASSIGN:
		baseCond += " AND assignee_id=" + com.ToStr(uid)

	case FM_CREATE:
		baseCond += " AND poster_id=" + com.ToStr(uid)
	}

	results, _ = x.Query(queryStr+baseCond, false)
	stats.OpenCount = parseCountResult(results)
	results, _ = x.Query(queryStr+baseCond, true)
	stats.ClosedCount = parseCountResult(results)
	return stats
}

// GetRepoIssueStats returns number of open and closed repository issues by given filter mode.
func GetRepoIssueStats(repoID, uid int64, filterMode int, isPull bool) (numOpen int64, numClosed int64) {
	queryStr := "SELECT COUNT(*) FROM `issue` "
	baseCond := " WHERE issue.repo_id=? AND issue.is_closed=?"

	if isPull {
		baseCond += " AND issue.is_pull=1"
	} else {
		baseCond += " AND issue.is_pull=0"
	}

	switch filterMode {
	case FM_ASSIGN:
		baseCond += " AND assignee_id=" + com.ToStr(uid)

	case FM_CREATE:
		baseCond += " AND poster_id=" + com.ToStr(uid)
	}

	results, _ := x.Query(queryStr+baseCond, repoID, false)
	numOpen = parseCountResult(results)
	results, _ = x.Query(queryStr+baseCond, repoID, true)
	numClosed = parseCountResult(results)
	return numOpen, numClosed
}

func updateIssue(e Engine, issue *Issue) error {
	_, err := e.Id(issue.ID).AllCols().Update(issue)
	return err
}

// UpdateIssue updates all fields of given issue.
func UpdateIssue(issue *Issue) error {
	return updateIssue(x, issue)
}

// updateIssueCols updates specific fields of given issue.
func updateIssueCols(e Engine, issue *Issue, cols ...string) error {
	_, err := e.Id(issue.ID).Cols(cols...).Update(issue)
	return err
}

func updateIssueUsersByStatus(e Engine, issueID int64, isClosed bool) error {
	_, err := e.Exec("UPDATE `issue_user` SET is_closed=? WHERE issue_id=?", isClosed, issueID)
	return err
}

// UpdateIssueUsersByStatus updates issue-user relations by issue status.
func UpdateIssueUsersByStatus(issueID int64, isClosed bool) error {
	return updateIssueUsersByStatus(x, issueID, isClosed)
}

func updateIssueUserByAssignee(e *xorm.Session, issue *Issue) (err error) {
	if _, err = e.Exec("UPDATE `issue_user` SET is_assigned=? WHERE issue_id=?", false, issue.ID); err != nil {
		return err
	}

	// Assignee ID equals to 0 means clear assignee.
	if issue.AssigneeID > 0 {
		if _, err = e.Exec("UPDATE `issue_user` SET is_assigned=? WHERE uid=? AND issue_id=?", true, issue.AssigneeID, issue.ID); err != nil {
			return err
		}
	}

	return updateIssue(e, issue)
}

// UpdateIssueUserByAssignee updates issue-user relation for assignee.
func UpdateIssueUserByAssignee(issue *Issue) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = updateIssueUserByAssignee(sess, issue); err != nil {
		return err
	}

	return sess.Commit()
}

// UpdateIssueUserByRead updates issue-user relation for reading.
func UpdateIssueUserByRead(uid, issueID int64) error {
	_, err := x.Exec("UPDATE `issue_user` SET is_read=? WHERE uid=? AND issue_id=?", true, uid, issueID)
	return err
}

// UpdateIssueUsersByMentions updates issue-user pairs by mentioning.
func UpdateIssueUsersByMentions(uids []int64, iid int64) error {
	for _, uid := range uids {
		iu := &IssueUser{UID: uid, IssueID: iid}
		has, err := x.Get(iu)
		if err != nil {
			return err
		}

		iu.IsMentioned = true
		if has {
			_, err = x.Id(iu.ID).AllCols().Update(iu)
		} else {
			_, err = x.Insert(iu)
		}
		if err != nil {
			return err
		}
	}
	return nil
}

// .____          ___.          .__
// |    |   _____ \_ |__   ____ |  |
// |    |   \__  \ | __ \_/ __ \|  |
// |    |___ / __ \| \_\ \  ___/|  |__
// |_______ (____  /___  /\___  >____/
//         \/    \/    \/     \/

// Label represents a label of repository for issues.
type Label struct {
	ID              int64 `xorm:"pk autoincr"`
	RepoID          int64 `xorm:"INDEX"`
	Name            string
	Color           string `xorm:"VARCHAR(7)"`
	NumIssues       int
	NumClosedIssues int
	NumOpenIssues   int  `xorm:"-"`
	IsChecked       bool `xorm:"-"`
}

// CalOpenIssues calculates the open issues of label.
func (m *Label) CalOpenIssues() {
	m.NumOpenIssues = m.NumIssues - m.NumClosedIssues
}

// NewLabel creates new label of repository.
func NewLabel(l *Label) error {
	_, err := x.Insert(l)
	return err
}

func getLabelByID(e Engine, id int64) (*Label, error) {
	if id <= 0 {
		return nil, ErrLabelNotExist{id}
	}

	l := &Label{ID: id}
	has, err := x.Get(l)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrLabelNotExist{l.ID}
	}
	return l, nil
}

// GetLabelByID returns a label by given ID.
func GetLabelByID(id int64) (*Label, error) {
	return getLabelByID(x, id)
}

// GetLabelsByRepoID returns all labels that belong to given repository by ID.
func GetLabelsByRepoID(repoID int64) ([]*Label, error) {
	labels := make([]*Label, 0, 10)
	return labels, x.Where("repo_id=?", repoID).Find(&labels)
}

func getLabelsByIssueID(e Engine, issueID int64) ([]*Label, error) {
	issueLabels, err := getIssueLabels(e, issueID)
	if err != nil {
		return nil, fmt.Errorf("getIssueLabels: %v", err)
	}

	var label *Label
	labels := make([]*Label, 0, len(issueLabels))
	for idx := range issueLabels {
		label, err = getLabelByID(e, issueLabels[idx].LabelID)
		if err != nil && !IsErrLabelNotExist(err) {
			return nil, fmt.Errorf("getLabelByID: %v", err)
		}
		labels = append(labels, label)
	}
	return labels, nil
}

// GetLabelsByIssueID returns all labels that belong to given issue by ID.
func GetLabelsByIssueID(issueID int64) ([]*Label, error) {
	return getLabelsByIssueID(x, issueID)
}

func updateLabel(e Engine, l *Label) error {
	_, err := e.Id(l.ID).AllCols().Update(l)
	return err
}

// UpdateLabel updates label information.
func UpdateLabel(l *Label) error {
	return updateLabel(x, l)
}

// DeleteLabel delete a label of given repository.
func DeleteLabel(repoID, labelID int64) error {
	l, err := GetLabelByID(labelID)
	if err != nil {
		if IsErrLabelNotExist(err) {
			return nil
		}
		return err
	}

	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if _, err = x.Where("label_id=?", labelID).Delete(new(IssueLabel)); err != nil {
		return err
	} else if _, err = sess.Delete(l); err != nil {
		return err
	}
	return sess.Commit()
}

// .___                            .____          ___.          .__
// |   | ______ ________ __   ____ |    |   _____ \_ |__   ____ |  |
// |   |/  ___//  ___/  |  \_/ __ \|    |   \__  \ | __ \_/ __ \|  |
// |   |\___ \ \___ \|  |  /\  ___/|    |___ / __ \| \_\ \  ___/|  |__
// |___/____  >____  >____/  \___  >_______ (____  /___  /\___  >____/
//          \/     \/            \/        \/    \/    \/     \/

// IssueLabel represetns an issue-lable relation.
type IssueLabel struct {
	ID      int64 `xorm:"pk autoincr"`
	IssueID int64 `xorm:"UNIQUE(s)"`
	LabelID int64 `xorm:"UNIQUE(s)"`
}

func hasIssueLabel(e Engine, issueID, labelID int64) bool {
	has, _ := e.Where("issue_id=? AND label_id=?", issueID, labelID).Get(new(IssueLabel))
	return has
}

// HasIssueLabel returns true if issue has been labeled.
func HasIssueLabel(issueID, labelID int64) bool {
	return hasIssueLabel(x, issueID, labelID)
}

func newIssueLabel(e *xorm.Session, issue *Issue, label *Label) (err error) {
	if _, err = e.Insert(&IssueLabel{
		IssueID: issue.ID,
		LabelID: label.ID,
	}); err != nil {
		return err
	}

	label.NumIssues++
	if issue.IsClosed {
		label.NumClosedIssues++
	}
	return updateLabel(e, label)
}

// NewIssueLabel creates a new issue-label relation.
func NewIssueLabel(issue *Issue, label *Label) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = newIssueLabel(sess, issue, label); err != nil {
		return err
	}

	return sess.Commit()
}

func getIssueLabels(e Engine, issueID int64) ([]*IssueLabel, error) {
	issueLabels := make([]*IssueLabel, 0, 10)
	return issueLabels, e.Where("issue_id=?", issueID).Asc("label_id").Find(&issueLabels)
}

// GetIssueLabels returns all issue-label relations of given issue by ID.
func GetIssueLabels(issueID int64) ([]*IssueLabel, error) {
	return getIssueLabels(x, issueID)
}

func deleteIssueLabel(e *xorm.Session, issue *Issue, label *Label) (err error) {
	if _, err = e.Delete(&IssueLabel{
		IssueID: issue.ID,
		LabelID: label.ID,
	}); err != nil {
		return err
	}

	label.NumIssues--
	if issue.IsClosed {
		label.NumClosedIssues--
	}
	return updateLabel(e, label)
}

// DeleteIssueLabel deletes issue-label relation.
func DeleteIssueLabel(issue *Issue, label *Label) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = deleteIssueLabel(sess, issue, label); err != nil {
		return err
	}

	return sess.Commit()
}

//    _____  .__.__                   __
//   /     \ |__|  |   ____   _______/  |_  ____   ____   ____
//  /  \ /  \|  |  | _/ __ \ /  ___/\   __\/  _ \ /    \_/ __ \
// /    Y    \  |  |_\  ___/ \___ \  |  | (  <_> )   |  \  ___/
// \____|__  /__|____/\___  >____  > |__|  \____/|___|  /\___  >
//         \/             \/     \/                   \/     \/

// Milestone represents a milestone of repository.
type Milestone struct {
	ID              int64 `xorm:"pk autoincr"`
	RepoID          int64 `xorm:"INDEX"`
	Name            string
	Content         string `xorm:"TEXT"`
	RenderedContent string `xorm:"-"`
	IsClosed        bool
	NumIssues       int
	NumClosedIssues int
	NumOpenIssues   int `xorm:"-"`
	Completeness    int // Percentage(1-100).
	Deadline        time.Time
	DeadlineString  string `xorm:"-"`
	IsOverDue       bool   `xorm:"-"`
	ClosedDate      time.Time
}

func (m *Milestone) BeforeUpdate() {
	if m.NumIssues > 0 {
		m.Completeness = m.NumClosedIssues * 100 / m.NumIssues
	} else {
		m.Completeness = 0
	}
}

func (m *Milestone) AfterSet(colName string, _ xorm.Cell) {
	if colName == "deadline" {
		if m.Deadline.Year() == 9999 {
			return
		}
		m.Deadline = regulateTimeZone(m.Deadline)

		m.DeadlineString = m.Deadline.Format("2006-01-02")
		if time.Now().After(m.Deadline) {
			m.IsOverDue = true
		}
	}
}

// CalOpenIssues calculates the open issues of milestone.
func (m *Milestone) CalOpenIssues() {
	m.NumOpenIssues = m.NumIssues - m.NumClosedIssues
}

// NewMilestone creates new milestone of repository.
func NewMilestone(m *Milestone) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if _, err = sess.Insert(m); err != nil {
		return err
	}

	if _, err = sess.Exec("UPDATE `repository` SET num_milestones=num_milestones+1 WHERE id=?", m.RepoID); err != nil {
		return err
	}
	return sess.Commit()
}

func getMilestoneByID(e Engine, id int64) (*Milestone, error) {
	m := &Milestone{ID: id}
	has, err := e.Get(m)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrMilestoneNotExist{id, 0}
	}
	return m, nil
}

// GetMilestoneByID returns the milestone of given ID.
func GetMilestoneByID(id int64) (*Milestone, error) {
	return getMilestoneByID(x, id)
}

// GetRepoMilestoneByID returns the milestone of given ID and repository.
func GetRepoMilestoneByID(repoID, milestoneID int64) (*Milestone, error) {
	m := &Milestone{ID: milestoneID, RepoID: repoID}
	has, err := x.Get(m)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrMilestoneNotExist{milestoneID, repoID}
	}
	return m, nil
}

// GetAllRepoMilestones returns all milestones of given repository.
func GetAllRepoMilestones(repoID int64) ([]*Milestone, error) {
	miles := make([]*Milestone, 0, 10)
	return miles, x.Where("repo_id=?", repoID).Find(&miles)
}

// GetMilestones returns a list of milestones of given repository and status.
func GetMilestones(repoID int64, page int, isClosed bool) ([]*Milestone, error) {
	miles := make([]*Milestone, 0, setting.IssuePagingNum)
	sess := x.Where("repo_id=? AND is_closed=?", repoID, isClosed)
	if page > 0 {
		sess = sess.Limit(setting.IssuePagingNum, (page-1)*setting.IssuePagingNum)
	}
	return miles, sess.Find(&miles)
}

func updateMilestone(e Engine, m *Milestone) error {
	_, err := e.Id(m.ID).AllCols().Update(m)
	return err
}

// UpdateMilestone updates information of given milestone.
func UpdateMilestone(m *Milestone) error {
	return updateMilestone(x, m)
}

func countRepoMilestones(e Engine, repoID int64) int64 {
	count, _ := e.Where("repo_id=?", repoID).Count(new(Milestone))
	return count
}

// CountRepoMilestones returns number of milestones in given repository.
func CountRepoMilestones(repoID int64) int64 {
	return countRepoMilestones(x, repoID)
}

func countRepoClosedMilestones(e Engine, repoID int64) int64 {
	closed, _ := e.Where("repo_id=? AND is_closed=?", repoID, true).Count(new(Milestone))
	return closed
}

// CountRepoClosedMilestones returns number of closed milestones in given repository.
func CountRepoClosedMilestones(repoID int64) int64 {
	return countRepoClosedMilestones(x, repoID)
}

// MilestoneStats returns number of open and closed milestones of given repository.
func MilestoneStats(repoID int64) (open int64, closed int64) {
	open, _ = x.Where("repo_id=? AND is_closed=?", repoID, false).Count(new(Milestone))
	return open, CountRepoClosedMilestones(repoID)
}

// ChangeMilestoneStatus changes the milestone open/closed status.
func ChangeMilestoneStatus(m *Milestone, isClosed bool) (err error) {
	repo, err := GetRepositoryByID(m.RepoID)
	if err != nil {
		return err
	}

	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	m.IsClosed = isClosed
	if err = updateMilestone(sess, m); err != nil {
		return err
	}

	repo.NumMilestones = int(countRepoMilestones(sess, repo.ID))
	repo.NumClosedMilestones = int(countRepoClosedMilestones(sess, repo.ID))
	if _, err = sess.Id(repo.ID).AllCols().Update(repo); err != nil {
		return err
	}
	return sess.Commit()
}

func changeMilestoneIssueStats(e *xorm.Session, issue *Issue) error {
	if issue.MilestoneID == 0 {
		return nil
	}

	m, err := getMilestoneByID(e, issue.MilestoneID)
	if err != nil {
		return err
	}

	if issue.IsClosed {
		m.NumOpenIssues--
		m.NumClosedIssues++
	} else {
		m.NumOpenIssues++
		m.NumClosedIssues--
	}

	return updateMilestone(e, m)
}

// ChangeMilestoneIssueStats updates the open/closed issues counter and progress
// for the milestone associated with the given issue.
func ChangeMilestoneIssueStats(issue *Issue) (err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = changeMilestoneIssueStats(sess, issue); err != nil {
		return err
	}

	return sess.Commit()
}

func changeMilestoneAssign(e *xorm.Session, oldMid int64, issue *Issue) error {
	if oldMid > 0 {
		m, err := getMilestoneByID(e, oldMid)
		if err != nil {
			return err
		}

		m.NumIssues--
		if issue.IsClosed {
			m.NumClosedIssues--
		}

		if err = updateMilestone(e, m); err != nil {
			return err
		} else if _, err = e.Exec("UPDATE `issue_user` SET milestone_id=0 WHERE issue_id=?", issue.ID); err != nil {
			return err
		}
	}

	if issue.MilestoneID > 0 {
		m, err := getMilestoneByID(e, issue.MilestoneID)
		if err != nil {
			return err
		}

		m.NumIssues++
		if issue.IsClosed {
			m.NumClosedIssues++
		}

		if m.NumIssues == 0 {
			return ErrWrongIssueCounter
		}

		if err = updateMilestone(e, m); err != nil {
			return err
		} else if _, err = e.Exec("UPDATE `issue_user` SET milestone_id=? WHERE issue_id=?", m.ID, issue.ID); err != nil {
			return err
		}
	}

	return updateIssue(e, issue)
}

// ChangeMilestoneAssign changes assignment of milestone for issue.
func ChangeMilestoneAssign(oldMid int64, issue *Issue) (err error) {
	sess := x.NewSession()
	defer sess.Close()
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = changeMilestoneAssign(sess, oldMid, issue); err != nil {
		return err
	}
	return sess.Commit()
}

// DeleteMilestoneByID deletes a milestone by given ID.
func DeleteMilestoneByID(id int64) error {
	m, err := GetMilestoneByID(id)
	if err != nil {
		if IsErrMilestoneNotExist(err) {
			return nil
		}
		return err
	}

	repo, err := GetRepositoryByID(m.RepoID)
	if err != nil {
		return err
	}

	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return err
	}

	if _, err = sess.Id(m.ID).Delete(new(Milestone)); err != nil {
		return err
	}

	repo.NumMilestones = int(countRepoMilestones(sess, repo.ID))
	repo.NumClosedMilestones = int(countRepoClosedMilestones(sess, repo.ID))
	if _, err = sess.Id(repo.ID).AllCols().Update(repo); err != nil {
		return err
	}

	if _, err = sess.Exec("UPDATE `issue` SET milestone_id=0 WHERE milestone_id=?", m.ID); err != nil {
		return err
	} else if _, err = sess.Exec("UPDATE `issue_user` SET milestone_id=0 WHERE milestone_id=?", m.ID); err != nil {
		return err
	}
	return sess.Commit()
}

// _________                                       __
// \_   ___ \  ____   _____   _____   ____   _____/  |_
// /    \  \/ /  _ \ /     \ /     \_/ __ \ /    \   __\
// \     \___(  <_> )  Y Y  \  Y Y  \  ___/|   |  \  |
//  \______  /\____/|__|_|  /__|_|  /\___  >___|  /__|
//         \/             \/      \/     \/     \/

// CommentType defines whether a comment is just a simple comment, an action (like close) or a reference.
type CommentType int

const (
	// Plain comment, can be associated with a commit (CommitId > 0) and a line (Line > 0)
	COMMENT_TYPE_COMMENT CommentType = iota
	COMMENT_TYPE_REOPEN
	COMMENT_TYPE_CLOSE

	// References.
	COMMENT_TYPE_ISSUE_REF
	// Reference from a commit (not part of a pull request)
	COMMENT_TYPE_COMMIT_REF
	// Reference from a comment
	COMMENT_TYPE_COMMENT_REF
	// Reference from a pull request
	COMMENT_TYPE_PULL_REF
)

type CommentTag int

const (
	COMMENT_TAG_NONE CommentTag = iota
	COMMENT_TAG_POSTER
	COMMENT_TAG_ADMIN
	COMMENT_TAG_OWNER
)

// Comment represents a comment in commit and issue page.
type Comment struct {
	ID              int64 `xorm:"pk autoincr"`
	Type            CommentType
	PosterID        int64
	Poster          *User `xorm:"-"`
	IssueID         int64 `xorm:"INDEX"`
	CommitID        int64
	Line            int64
	Content         string    `xorm:"TEXT"`
	RenderedContent string    `xorm:"-"`
	Created         time.Time `xorm:"CREATED"`

	// Reference issue in commit message
	CommitSHA string `xorm:"VARCHAR(40)"`

	Attachments []*Attachment `xorm:"-"`

	// For view issue page.
	ShowTag CommentTag `xorm:"-"`
}

func (c *Comment) AfterSet(colName string, _ xorm.Cell) {
	var err error
	switch colName {
	case "id":
		c.Attachments, err = GetAttachmentsByCommentID(c.ID)
		if err != nil {
			log.Error(3, "GetAttachmentsByCommentID[%d]: %v", c.ID, err)
		}

	case "poster_id":
		c.Poster, err = GetUserByID(c.PosterID)
		if err != nil {
			if IsErrUserNotExist(err) {
				c.PosterID = -1
				c.Poster = NewFakeUser()
			} else {
				log.Error(3, "GetUserByID[%d]: %v", c.ID, err)
			}
		}
	case "created":
		c.Created = regulateTimeZone(c.Created)
	}
}

func (c *Comment) AfterDelete() {
	_, err := DeleteAttachmentsByComment(c.ID, true)

	if err != nil {
		log.Info("Could not delete files for comment %d on issue #%d: %s", c.ID, c.IssueID, err)
	}
}

// HashTag returns unique hash tag for comment.
func (c *Comment) HashTag() string {
	return "issuecomment-" + com.ToStr(c.ID)
}

// EventTag returns unique event hash tag for comment.
func (c *Comment) EventTag() string {
	return "event-" + com.ToStr(c.ID)
}

func createComment(e *xorm.Session, u *User, repo *Repository, issue *Issue, commitID, line int64, cmtType CommentType, content, commitSHA string, uuids []string) (_ *Comment, err error) {
	comment := &Comment{
		PosterID:  u.Id,
		Type:      cmtType,
		IssueID:   issue.ID,
		CommitID:  commitID,
		Line:      line,
		Content:   content,
		CommitSHA: commitSHA,
	}
	if _, err = e.Insert(comment); err != nil {
		return nil, err
	}

	// Check comment type.
	switch cmtType {
	case COMMENT_TYPE_COMMENT:
		if _, err = e.Exec("UPDATE `issue` SET num_comments=num_comments+1 WHERE id=?", issue.ID); err != nil {
			return nil, err
		}

		// Check attachments.
		attachments := make([]*Attachment, 0, len(uuids))
		for _, uuid := range uuids {
			attach, err := getAttachmentByUUID(e, uuid)
			if err != nil {
				if IsErrAttachmentNotExist(err) {
					continue
				}
				return nil, fmt.Errorf("getAttachmentByUUID[%s]: %v", uuid, err)
			}
			attachments = append(attachments, attach)
		}

		for i := range attachments {
			attachments[i].IssueID = issue.ID
			attachments[i].CommentID = comment.ID
			// No assign value could be 0, so ignore AllCols().
			if _, err = e.Id(attachments[i].ID).Update(attachments[i]); err != nil {
				return nil, fmt.Errorf("update attachment[%d]: %v", attachments[i].ID, err)
			}
		}

		// Notify watchers.
		act := &Action{
			ActUserID:    u.Id,
			ActUserName:  u.Name,
			ActEmail:     u.Email,
			OpType:       COMMENT_ISSUE,
			Content:      fmt.Sprintf("%d|%s", issue.Index, strings.Split(content, "\n")[0]),
			RepoID:       repo.ID,
			RepoUserName: repo.Owner.Name,
			RepoName:     repo.Name,
			IsPrivate:    repo.IsPrivate,
		}
		if err = notifyWatchers(e, act); err != nil {
			return nil, err
		}

	case COMMENT_TYPE_REOPEN:
		if issue.IsPull {
			_, err = e.Exec("UPDATE `repository` SET num_closed_pulls=num_closed_pulls-1 WHERE id=?", repo.ID)
		} else {
			_, err = e.Exec("UPDATE `repository` SET num_closed_issues=num_closed_issues-1 WHERE id=?", repo.ID)
		}
		if err != nil {
			return nil, err
		}
	case COMMENT_TYPE_CLOSE:
		if issue.IsPull {
			_, err = e.Exec("UPDATE `repository` SET num_closed_pulls=num_closed_pulls+1 WHERE id=?", repo.ID)
		} else {
			_, err = e.Exec("UPDATE `repository` SET num_closed_issues=num_closed_issues+1 WHERE id=?", repo.ID)
		}
		if err != nil {
			return nil, err
		}
	}

	return comment, nil
}

func createStatusComment(e *xorm.Session, doer *User, repo *Repository, issue *Issue) (*Comment, error) {
	cmtType := COMMENT_TYPE_CLOSE
	if !issue.IsClosed {
		cmtType = COMMENT_TYPE_REOPEN
	}
	return createComment(e, doer, repo, issue, 0, 0, cmtType, "", "", nil)
}

// CreateComment creates comment of issue or commit.
func CreateComment(doer *User, repo *Repository, issue *Issue, commitID, line int64, cmtType CommentType, content, commitSHA string, attachments []string) (comment *Comment, err error) {
	sess := x.NewSession()
	defer sessionRelease(sess)
	if err = sess.Begin(); err != nil {
		return nil, err
	}

	comment, err = createComment(sess, doer, repo, issue, commitID, line, cmtType, content, commitSHA, attachments)
	if err != nil {
		return nil, err
	}

	return comment, sess.Commit()
}

// CreateIssueComment creates a plain issue comment.
func CreateIssueComment(doer *User, repo *Repository, issue *Issue, content string, attachments []string) (*Comment, error) {
	return CreateComment(doer, repo, issue, 0, 0, COMMENT_TYPE_COMMENT, content, "", attachments)
}

// CreateRefComment creates a commit reference comment to issue.
func CreateRefComment(doer *User, repo *Repository, issue *Issue, content, commitSHA string) error {
	if len(commitSHA) == 0 {
		return fmt.Errorf("cannot create reference with empty commit SHA")
	}

	// Check if same reference from same commit has already existed.
	has, err := x.Get(&Comment{
		Type:      COMMENT_TYPE_COMMIT_REF,
		IssueID:   issue.ID,
		CommitSHA: commitSHA,
	})
	if err != nil {
		return fmt.Errorf("check reference comment: %v", err)
	} else if has {
		return nil
	}

	_, err = CreateComment(doer, repo, issue, 0, 0, COMMENT_TYPE_COMMIT_REF, content, commitSHA, nil)
	return err
}

// GetCommentByID returns the comment by given ID.
func GetCommentByID(id int64) (*Comment, error) {
	c := new(Comment)
	has, err := x.Id(id).Get(c)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrCommentNotExist{id}
	}
	return c, nil
}

// GetCommentsByIssueID returns all comments of issue by given ID.
func GetCommentsByIssueID(issueID int64) ([]*Comment, error) {
	comments := make([]*Comment, 0, 10)
	return comments, x.Where("issue_id=?", issueID).Asc("created").Find(&comments)
}

// UpdateComment updates information of comment.
func UpdateComment(c *Comment) error {
	_, err := x.Id(c.ID).AllCols().Update(c)
	return err
}

// Attachment represent a attachment of issue/comment/release.
type Attachment struct {
	ID        int64  `xorm:"pk autoincr"`
	UUID      string `xorm:"uuid UNIQUE"`
	IssueID   int64  `xorm:"INDEX"`
	CommentID int64
	ReleaseID int64 `xorm:"INDEX"`
	Name      string
	Created   time.Time `xorm:"CREATED"`
}

// AttachmentLocalPath returns where attachment is stored in local file system based on given UUID.
func AttachmentLocalPath(uuid string) string {
	return path.Join(setting.AttachmentPath, uuid[0:1], uuid[1:2], uuid)
}

// LocalPath returns where attachment is stored in local file system.
func (attach *Attachment) LocalPath() string {
	return AttachmentLocalPath(attach.UUID)
}

// NewAttachment creates a new attachment object.
func NewAttachment(name string, buf []byte, file multipart.File) (_ *Attachment, err error) {
	attach := &Attachment{
		UUID: gouuid.NewV4().String(),
		Name: name,
	}

	if err = os.MkdirAll(path.Dir(attach.LocalPath()), os.ModePerm); err != nil {
		return nil, fmt.Errorf("MkdirAll: %v", err)
	}

	fw, err := os.Create(attach.LocalPath())
	if err != nil {
		return nil, fmt.Errorf("Create: %v", err)
	}
	defer fw.Close()

	if _, err = fw.Write(buf); err != nil {
		return nil, fmt.Errorf("Write: %v", err)
	} else if _, err = io.Copy(fw, file); err != nil {
		return nil, fmt.Errorf("Copy: %v", err)
	}

	sess := x.NewSession()
	defer sessionRelease(sess)
	if err := sess.Begin(); err != nil {
		return nil, err
	}

	if _, err := sess.Insert(attach); err != nil {
		return nil, err
	}

	return attach, sess.Commit()
}

func getAttachmentByUUID(e Engine, uuid string) (*Attachment, error) {
	attach := &Attachment{UUID: uuid}
	has, err := x.Get(attach)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrAttachmentNotExist{0, uuid}
	}
	return attach, nil
}

// GetAttachmentByUUID returns attachment by given UUID.
func GetAttachmentByUUID(uuid string) (*Attachment, error) {
	return getAttachmentByUUID(x, uuid)
}

// GetAttachmentsByIssueID returns all attachments for given issue by ID.
func GetAttachmentsByIssueID(issueID int64) ([]*Attachment, error) {
	attachments := make([]*Attachment, 0, 10)
	return attachments, x.Where("issue_id=? AND comment_id=0", issueID).Find(&attachments)
}

// GetAttachmentsByCommentID returns all attachments if comment by given ID.
func GetAttachmentsByCommentID(commentID int64) ([]*Attachment, error) {
	attachments := make([]*Attachment, 0, 10)
	return attachments, x.Where("comment_id=?", commentID).Find(&attachments)
}

// DeleteAttachment deletes the given attachment and optionally the associated file.
func DeleteAttachment(a *Attachment, remove bool) error {
	_, err := DeleteAttachments([]*Attachment{a}, remove)
	return err
}

// DeleteAttachments deletes the given attachments and optionally the associated files.
func DeleteAttachments(attachments []*Attachment, remove bool) (int, error) {
	for i, a := range attachments {
		if remove {
			if err := os.Remove(a.LocalPath()); err != nil {
				return i, err
			}
		}

		if _, err := x.Delete(a.ID); err != nil {
			return i, err
		}
	}

	return len(attachments), nil
}

// DeleteAttachmentsByIssue deletes all attachments associated with the given issue.
func DeleteAttachmentsByIssue(issueId int64, remove bool) (int, error) {
	attachments, err := GetAttachmentsByIssueID(issueId)

	if err != nil {
		return 0, err
	}

	return DeleteAttachments(attachments, remove)
}

// DeleteAttachmentsByComment deletes all attachments associated with the given comment.
func DeleteAttachmentsByComment(commentId int64, remove bool) (int, error) {
	attachments, err := GetAttachmentsByCommentID(commentId)

	if err != nil {
		return 0, err
	}

	return DeleteAttachments(attachments, remove)
}