summaryrefslogtreecommitdiff
path: root/forummodel.cpp
blob: 14f053f928f892a433f112148f83e842e89db978 (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
#include <QtCore/QDebug>
#include <QtSql/QSqlError>

#include "global.h"
#include "board.h"
#include "xmlrpcinterface.h"
#include "fetchtopicsaction.h"
#include "forummodel.h"

ForumModel::ForumModel(QObject *parent) :
    QAbstractListModel(parent), _board(0), _forumId(-1),
    _numAnnouncements(0), _numSticky(0), _eof(false)
{
	QHash<int, QByteArray> roles = roleNames();
	roles[TitleRole] = QByteArray("title");
	roles[IconRole] = QByteArray("icon");
	roles[TopicIdRole] = QByteArray("topicId");
	roles[NumRepliesRole] = QByteArray("numReplies");
	roles[UnreadRole] = QByteArray("unread");
	setRoleNames(roles);
}

Board * ForumModel::board() const
{
	return _board;
}

void ForumModel::setBoard(Board *board)
{
	if (_board != board) {
		disconnect(this, SLOT(handleForumTopicsChanged(int,Board::TopicType,int,int)));
		disconnect(this, SLOT(handleForumTopicChanged(int,int)));
		clearModel();

		_board = board;

		if (_board) {
			connect(_board, SIGNAL(forumTopicsChanged(int,Board::TopicType,int,int)),
			        SLOT(handleForumTopicsChanged(int,Board::TopicType,int,int)));
			connect(_board, SIGNAL(forumTopicChanged(int,int)),
			        SLOT(handleForumTopicChanged(int,int)));
			if (_forumId >= 0) {
				update();
				reload();
			}
		}
		emit boardChanged();
	}
}

int ForumModel::forumId() const
{
	return _forumId;
}

void ForumModel::setForumId(const int id)
{
	if (_forumId != id) {
		clearModel();

		_forumId = id;

		if (_forumId >= 0 && _board) {
			update();
			reload();
		}
		emit forumIdChanged();
	}
}

int ForumModel::rowCount(const QModelIndex &parent) const
{
	return parent.isValid() ? 0 : _data.size();
}

QVariant ForumModel::data(const QModelIndex &index, int role) const
{
	if (!index.isValid()) return QVariant();
	const int row = index.row();
	if (row >= _data.size()) {
		qWarning() << "Could not seek to" << row;
		return QVariant();
	}

	switch (role) {
	case TitleRole:
		return _data[row].title;
	case TopicIdRole:
		return _data[row].topic_id;
	case TopicTypeRole:
		return _data[row].type;
	case NumRepliesRole:
		return _data[row].num_replies;
	case UnreadRole:
		return _data[row].unread;
	}

	return QVariant();
}

bool ForumModel::canFetchMore(const QModelIndex &parent) const
{
	if (parent.isValid() || !_board || _forumId < 0) return false; // Invalid state
	return !_eof;
}

void ForumModel::fetchMore(const QModelIndex &parent)
{
	if (parent.isValid()) return;
	if (!_board || _forumId < 0) return;
	if (_eof) return;

	const int normal_offset = _numAnnouncements + _numSticky;
	const int normal_start = _data.size() - normal_offset;
	QList<Topic> topics = loadTopics(Board::Normal,
	                                 normal_start, normal_start + FORUM_PAGE_SIZE - 1);
	const int normal_new_end = normal_start + topics.size() - 1;

	if (topics.empty()) {
		// We could not load anything more from DB!
		_eof = true;
	} else {
		beginInsertRows(QModelIndex(),
		                normal_offset + normal_start, normal_offset + normal_new_end);
		_data.append(topics);
		_eof = topics.size() < FORUM_PAGE_SIZE; // If short read, we reached EOF.
		endInsertRows();
	}

	if (_board->service()->isAccessible()) {
		if (!topics.empty()) {
			QDateTime last = oldestPostUpdate(topics);
			// If the topics we got from DB are too old, refresh online.
			if (last.secsTo(QDateTime::currentDateTimeUtc()) > FORUM_TOPICS_TLL) {
				qDebug() << "Fetching topics because of old";
				Q_ASSERT(normal_new_end >= 0);
				_board->enqueueAction(new FetchTopicsAction(_forumId,
				                                            Board::Normal,
															normal_start,
															normal_new_end,
															_board));
			}
		}

		// Try to fetch more topics if board is online and we reached the end of DB
		if (_eof) {
			qDebug() << "Fetching topics because of EOF";
			const int normal_cur_end = _data.size() - 1 - normal_offset;
			_board->enqueueAction(new FetchTopicsAction(_forumId,
			                                            Board::Normal,
			                                            normal_cur_end + 1,
			                                            normal_cur_end + FORUM_PAGE_SIZE,
			                                            _board));
		}
	}
}

void ForumModel::refresh()
{
	// Forcefully refresh all topics on this forum
	_board->enqueueAction(new FetchTopicsAction(_forumId,
	                                            Board::Announcement,
	                                            0,
	                                            FetchTopicsAction::FetchAllTopics,
	                                            _board));
	_board->enqueueAction(new FetchTopicsAction(_forumId,
	                                            Board::Sticky,
	                                            0,
	                                            FetchTopicsAction::FetchAllTopics,
	                                            _board));
	_board->enqueueAction(new FetchTopicsAction(_forumId,
	                                            Board::Normal,
	                                            0,
	                                            FetchTopicsAction::FetchAllTopics,
	                                            _board));
}

QDateTime ForumModel::parseDateTime(const QVariant &v)
{
	QString s = v.toString();
	QDateTime dt = QDateTime::fromString(s, Qt::ISODate);
	dt.setTimeSpec(Qt::UTC);
	return dt;
}

QDateTime ForumModel::oldestPostUpdate(const QList<Topic> &topics)
{
	if (topics.empty()) return QDateTime::currentDateTimeUtc();
	QDateTime min = topics.first().last_update_time;
	foreach (const Topic& topic, topics) {
		if (min < topic.last_update_time) min = topic.last_update_time;
	}
	return min;
}

QDateTime ForumModel::lastTopPostUpdate()
{
	if (!_board) return QDateTime();
	QSqlDatabase db = _board->database();
	QSqlQuery query(db);
	query.prepare("SELECT MIN(last_update_time) FROM topics "
	              "WHERE forum_id = :forum_id AND position = 0");
	query.bindValue(":forum_id", _forumId);
	if (query.exec()) {
		if (query.next()) {
			return parseDateTime(query.value(0));
		}
	} else {
		qWarning() << "Could not fetch posts:" << query.lastError().text();
	}
	return QDateTime();
}

QList<ForumModel::Topic> ForumModel::loadTopics(Board::TopicType type, int start, int end)
{
	Q_ASSERT(_board);
	QList<Topic> topics;
	QSqlQuery query(_board->database());
	query.prepare("SELECT topic_id, topic_type, topic_title, reply_number, new_post, last_reply_time, last_update_time FROM topics "
	              "WHERE forum_id = :forum_id AND topic_type = :topic_type AND position BETWEEN :start AND :end "
	              "ORDER by position ASC ");
	query.bindValue(":forum_id", _forumId);
	query.bindValue(":topic_type", type);
	query.bindValue(":start", start);
	query.bindValue(":end", end);
	if (query.exec()) {
		topics.reserve(end - start + 1);
		while (query.next()) {
			Topic topic;
			topic.topic_id = query.value(0).toInt();
			topic.type = type;
			topic.title = query.value(2).toString();
			topic.num_replies = query.value(3).toInt();
			topic.unread = query.value(4).toBool();
			topic.last_reply_time = parseDateTime(query.value(5));
			topic.last_update_time = parseDateTime(query.value(6));
			topics.append(topic);
		}
	} else {
		qWarning() << "Could not load topics:" << query.lastError().text();
	}
	return topics;
}

void ForumModel::clearModel()
{
	beginResetModel();
	_eof = false;
	_data.clear();
	endResetModel();
}

void ForumModel::handleForumTopicsChanged(int forumId, Board::TopicType type,
                                          int start, int end)
{
	if (forumId != _forumId) {
		return; // Not our topics
	}
	if (type == Board::Normal) {
		// Yep, our topics list changed.
		const int normal_offset = _numAnnouncements + _numSticky;
		int current_normal_end = _data.size() - 1 - normal_offset;

		qDebug() << "My topics changed" << start << end;

		if (end >= current_normal_end) {
			// If for any reason we have more topics now, it means we might
			// no longer be EOF...
			_eof = false;
		}
		if (start > current_normal_end + 1) {
			// On the other hand, if the topics are too far away,
			// do not load them until we fetchMore().
			qDebug() << "Topics too far";
			return;
		}

		QList<Topic> topics = loadTopics(Board::Normal, start, end);
		if (topics.size() < end - start + 1) {
			_eof = true; // Short read
			end = start + topics.size() - 1;
			if (current_normal_end > end) {
				const int current_full_end = _data.size() - 1;
				const int new_full_end = end + normal_offset;

				Q_ASSERT(new_full_end < current_full_end);
				beginRemoveRows(QModelIndex(),
				                new_full_end, current_full_end);
				while (_data.size() > new_full_end) {
					_data.removeLast();
				}
				current_normal_end = _data.size() - 1 - normal_offset;
				Q_ASSERT(current_normal_end == end);
				endRemoveRows();
			}
		}

		if (end > current_normal_end) {
			const int current_full_end = _data.size() - 1;
			const int new_full_end = end + normal_offset;
			qDebug() << "Insert rows" << current_full_end + 1 << new_full_end;
			beginInsertRows(QModelIndex(), current_full_end + 1, new_full_end);
			_data.reserve(new_full_end + 1);
			const int full_start = normal_offset + start;
			for (int i = full_start; i <= current_full_end; i++) {
				_data[i] = topics[i - full_start];
			}
			Q_ASSERT(current_full_end + 1 >= full_start);
			for (int i = current_full_end + 1; i <= new_full_end; i++) {
				_data.append(topics[i - full_start]);
			}
			endInsertRows();
			Q_ASSERT(new_full_end == _data.size() - 1);
			emit dataChanged(createIndex(full_start, 0), createIndex(new_full_end, 0));
		} else {
			qDebug() << "Just refresh the data";
			const int full_start = normal_offset + start;
			const int full_end = normal_offset + end;
			for (int i = full_start; i < full_end; i++) {
				_data[i] = topics[i - full_start];
			}
			emit dataChanged(createIndex(full_start, 0), createIndex(full_end, 0));
		}
	} else if (type == Board::Sticky || type == Board::Announcement) {
		// We just reload these fully
		QList<Topic> topics = loadTopics(type, 0, MAX_FORUM_PAGE_SIZE - 1);
		const int offset = type == Board::Sticky ? _numAnnouncements : 0;
		int * const cur_number_p = type == Board::Sticky ? &_numSticky : &_numAnnouncements;
		const int cur_number = *cur_number_p;

		if (topics.size() < cur_number) {
			const int cur_end = offset + cur_number - 1;
			const int new_end = offset + topics.size() - 1;
			beginRemoveRows(QModelIndex(), new_end + 1, cur_end);
			for (int i = new_end + 1; i <= cur_end; i++) {
				_data.removeAt(i);
				(*cur_number_p)--;
			}
			endRemoveRows();
		} else if (topics.size() > cur_number) {
			const int cur_end = offset + cur_number - 1;
			const int new_end = offset + topics.size() - 1;
			const int new_start = cur_end + 1;
			Q_ASSERT(new_end - offset == topics.size() - 1);
			beginInsertRows(QModelIndex(), new_start, new_end);
			for (int i = new_start; i <= new_end; i++) {
				_data.insert(i, topics.takeAt(new_start - offset));
				(*cur_number_p)++;
			}
			endInsertRows();
			Q_ASSERT(topics.size() == cur_number);
		}

		const int start = offset;
		const int end = offset + topics.size() - 1;
		for (int i = start; i <= end; i++) {
			_data.insert(i, topics.at(i - offset));
		}
		emit dataChanged(createIndex(start, 0), createIndex(end, 0));
	}
}

void ForumModel::handleForumTopicChanged(int forumId, int topicId)
{
	if (forumId == _forumId) {
		Board::TopicType type = Board::Announcement;
		int pos = 0;
		for (int i = 0; i < _data.size(); i++) {
			Topic& topic = _data[i];
			if (topic.type != type) {
				type = topic.type;
				pos = 0;
			}
			if (topic.topic_id == topicId) {
				// Need to refresh this topic
				QList<Topic> topics = loadTopics(type, pos, pos);
				if (topics.size() == 1) {
					_data[i] = topics[0];
					emit dataChanged(createIndex(i, 0), createIndex(i, 0));
				} else {
					qWarning() << "Topic changed yet not in DB";
				}
			}
			pos++;
		}
	}
}

void ForumModel::update()
{
	if (!_board || _forumId < 0) return;
	// Start by requesting an update of the first 20 topics
	if (!_board->service()->isAccessible()) return;
	QDateTime last = lastTopPostUpdate();
	if (!last.isValid() ||
	        last.secsTo(QDateTime::currentDateTimeUtc()) > FORUM_TOP_TLL) {
		// Outdated or empty, refresh.
		qDebug() << "Fetching topics because the top are old";
		_board->enqueueAction(new FetchTopicsAction(_forumId, Board::Announcement,
		                                            0, FORUM_PAGE_SIZE - 1, _board));
		_board->enqueueAction(new FetchTopicsAction(_forumId, Board::Sticky,
		                                            0, FORUM_PAGE_SIZE - 1, _board));
		_board->enqueueAction(new FetchTopicsAction(_forumId, Board::Normal,
		                                            0, FORUM_PAGE_SIZE - 1, _board));
	} else {
		qDebug() << "Topics not outdated";
	}
}

void ForumModel::reload()
{
	Q_ASSERT(_data.empty());
	Q_ASSERT(!_eof);
	// Load announcements / sticky topics fully
	QList<Topic> topics;
	topics = loadTopics(Board::Announcement, 0, MAX_FORUM_PAGE_SIZE - 1);
	if (!topics.empty()) {
		beginInsertRows(QModelIndex(), 0, topics.size() - 1);
		_data.append(topics);
		_numAnnouncements = topics.size();
		endInsertRows();
	} else {
		_numAnnouncements = 0;
	}

	topics = loadTopics(Board::Sticky, 0, MAX_FORUM_PAGE_SIZE - 1);
	if (!topics.empty()) {
		beginInsertRows(QModelIndex(), _numAnnouncements, _numAnnouncements + topics.size() - 1);
		_data.append(topics);
		_numSticky = topics.size();
		endInsertRows();
	} else {
		_numSticky = 0;
	}

	// Fetch an initial bunch of normal topics
	fetchMore();
}