src/Module/Conversation/Timeline.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Module\Conversation;
  23
  24 use Friendica\App;
  25 use Friendica\App\Mode;
  26 use Friendica\BaseModule;
  27 use Friendica\Content\Conversation\Collection\Timelines;
  28 use Friendica\Content\Conversation\Entity\Timeline as TimelineEntity;
  29 use Friendica\Content\Conversation\Repository\Channel;
  30 use Friendica\Core\Cache\Capability\ICanCache;
  31 use Friendica\Core\Cache\Enum\Duration;
  32 use Friendica\Core\Config\Capability\IManageConfigValues;
  33 use Friendica\Core\L10n;
  34 use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
  35 use Friendica\Core\Renderer;
  36 use Friendica\Core\Session\Capability\IHandleUserSessions;
  37 use Friendica\Model\Contact;
  38 use Friendica\Model\User;
  39 use Friendica\Database\Database;
  40 use Friendica\Database\DBA;
  41 use Friendica\Model\Item;
  42 use Friendica\Model\Post;
  43 use Friendica\Module\Response;
  44 use Friendica\Util\DateTimeFormat;
  45 use Friendica\Util\Profiler;
  46 use Psr\Log\LoggerInterface;
  47
  48 class Timeline extends BaseModule
  49 {
  50         /** @var string */
  51         protected $selectedTab;
  52         /** @var mixed */
  53         protected $minId;
  54         /** @var mixed */
  55         protected $maxId;
  56         /** @var string */
  57         protected $accountTypeString;
  58         /** @var int */
  59         protected $accountType;
  60         /** @var int */
  61         protected $itemUriId;
  62         /** @var int */
  63         protected $itemsPerPage;
  64         /** @var bool */
  65         protected $noSharer;
  66         /** @var bool */
  67         protected $force;
  68         /** @var bool */
  69         protected $update;
  70
  71         /** @var App\Mode $mode */
  72         protected $mode;
  73         /** @var IHandleUserSessions */
  74         protected $session;
  75         /** @var Database */
  76         protected $database;
  77         /** @var IManagePersonalConfigValues */
  78         protected $pConfig;
  79         /** @var IManageConfigValues The config */
  80         protected $config;
  81         /** @var ICanCache */
  82         protected $cache;
  83         /** @var Channel */
  84         protected $channel;
  85
  86         public function __construct(Channel $channel, Mode $mode, IHandleUserSessions $session, Database $database, IManagePersonalConfigValues $pConfig, IManageConfigValues $config, ICanCache $cache, L10n $l10n, App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, Response $response, array $server, array $parameters = [])
  87         {
  88                 parent::__construct($l10n, $baseUrl, $args, $logger, $profiler, $response, $server, $parameters);
  89
  90                 $this->channel  = $channel;
  91                 $this->mode     = $mode;
  92                 $this->session  = $session;
  93                 $this->database = $database;
  94                 $this->pConfig  = $pConfig;
  95                 $this->config   = $config;
  96                 $this->cache    = $cache;
  97         }
  98
  99         /**
 100          * Computes module parameters from the request and local configuration
 101          *
 102          * @throws HTTPException\BadRequestException
 103          * @throws HTTPException\ForbiddenException
 104          */
 105         protected function parseRequest(array $request)
 106         {
 107                 $this->logger->debug('Got request', $request);
 108                 $this->selectedTab = $this->parameters['content'] ?? $request['channel'] ?? '';
 109
 110                 $this->accountTypeString = $request['accounttype'] ?? $this->parameters['accounttype'] ?? '';
 111                 $this->accountType       = User::getAccountTypeByString($this->accountTypeString);
 112
 113                 if ($this->mode->isMobile()) {
 114                         $this->itemsPerPage = $this->pConfig->get(
 115                                 $this->session->getLocalUserId(),
 116                                 'system',
 117                                 'itemspage_mobile_network',
 118                                 $this->config->get('system', 'itemspage_network_mobile')
 119                         );
 120                 } else {
 121                         $this->itemsPerPage = $this->pConfig->get(
 122                                 $this->session->getLocalUserId(),
 123                                 'system',
 124                                 'itemspage_network',
 125                                 $this->config->get('system', 'itemspage_network')
 126                         );
 127                 }
 128
 129                 if (!empty($request['item'])) {
 130                         $item            = Post::selectFirst(['parent', 'parent-uri-id'], ['id' => $request['item']]);
 131                         $this->itemUriId = $item['parent-uri-id'] ?? 0;
 132                 } else {
 133                         $this->itemUriId = 0;
 134                 }
 135
 136                 $this->minId = $request['min_id'] ?? null;
 137                 $this->maxId = $request['max_id'] ?? null;
 138
 139                 $this->noSharer = !empty($request['no_sharer']);
 140                 $this->force    = !empty($request['force']) && !empty($request['item']);
 141                 $this->update   = !empty($request['force']) && !empty($request['first_received']) && !empty($request['first_created']) && !empty($request['first_uriid']) && !empty($request['first_commented']);
 142         }
 143
 144         protected function getNoSharerWidget(string $base): string
 145         {
 146                 $path = $this->selectedTab;
 147                 if (!empty($this->accountTypeString)) {
 148                         $path .= '/' . $this->accountTypeString;
 149                 }
 150                 $query_parameters = [];
 151
 152                 if (!empty($this->minId)) {
 153                         $query_parameters['min_id'] = $this->minId;
 154                 }
 155                 if (!empty($this->maxId)) {
 156                         $query_parameters['max_id'] = $this->maxId;
 157                 }
 158
 159                 $path_all       = $path . (!empty($query_parameters) ? '?' . http_build_query($query_parameters) : '');
 160                 $path_no_sharer = $path . '?' . http_build_query(array_merge($query_parameters, ['no_sharer' => true]));
 161                 return Renderer::replaceMacros(Renderer::getMarkupTemplate('widget/community_sharer.tpl'), [
 162                         '$title'           => $this->l10n->t('Own Contacts'),
 163                         '$path_all'        => $path_all,
 164                         '$path_no_sharer'  => $path_no_sharer,
 165                         '$no_sharer'       => $this->noSharer,
 166                         '$all'             => $this->l10n->t('Include'),
 167                         '$no_sharer_label' => $this->l10n->t('Hide'),
 168                         '$base'            => $base,
 169                 ]);
 170         }
 171
 172         protected function getTabArray(Timelines $timelines, string $prefix, string $parameter = ''): array
 173         {
 174                 $tabs = [];
 175
 176                 foreach ($timelines as $tab) {
 177                         if (is_null($tab->path) && !empty($parameter)) {
 178                                 $path = $prefix . '?' . http_build_query([$parameter => $tab->code]);
 179                         } else {
 180                                 $path = $tab->path ?? $prefix . '/' . $tab->code;
 181                         }
 182                         $tabs[$tab->code] = [
 183                                 'code'      => $tab->code,
 184                                 'label'     => $tab->label,
 185                                 'url'       => $path,
 186                                 'sel'       => $this->selectedTab == $tab->code ? 'active' : '',
 187                                 'title'     => $tab->description,
 188                                 'id'        => $prefix . '-' . $tab->code . '-tab',
 189                                 'accesskey' => $tab->accessKey,
 190                         ];
 191                 }
 192                 return $tabs;
 193         }
 194
 195         /**
 196          * Database query for the channel page
 197          *
 198          * @return array
 199          * @throws \Exception
 200          */
 201         protected function getChannelItems()
 202         {
 203                 $items = $this->getRawChannelItems();
 204
 205                 $contacts = $this->database->selectToArray('user-contact', ['cid'], ['channel-frequency' => Contact\User::FREQUENCY_REDUCED, 'cid' => array_column($items, 'owner-id')]);
 206                 $reduced  = array_column($contacts, 'cid');
 207
 208                 $maxpostperauthor = $this->config->get('channel', 'max_posts_per_author');
 209
 210                 if ($maxpostperauthor != 0) {
 211                         $count          = 1;
 212                         $owner_posts    = [];
 213                         $selected_items = [];
 214
 215                         while (count($selected_items) < $this->itemsPerPage && ++$count < 50 && count($items) > 0) {
 216                                 $maxposts = round((count($items) / $this->itemsPerPage) * $maxpostperauthor);
 217                                 $minId = $items[array_key_first($items)]['created'];
 218                                 $maxId = $items[array_key_last($items)]['created'];
 219
 220                                 foreach ($items as $item) {
 221                                         if (!in_array($item['owner-id'], $reduced)) {
 222                                                 continue;
 223                                         }
 224                                         $owner_posts[$item['owner-id']][$item['uri-id']] = (($item['comments'] * 100) + $item['activities']);
 225                                 }
 226                                 foreach ($owner_posts as $posts) {
 227                                         if (count($posts) <= $maxposts) {
 228                                                 continue;
 229                                         }
 230                                         asort($posts);
 231                                         while (count($posts) > $maxposts) {
 232                                                 $uri_id = array_key_first($posts);
 233                                                 unset($posts[$uri_id]);
 234                                                 unset($items[$uri_id]);
 235                                         }
 236                                 }
 237                                 $selected_items = array_merge($selected_items, $items);
 238
 239                                 // If we're looking at a "previous page", the lookup continues forward in time because the list is
 240                                 // sorted in chronologically decreasing order
 241                                 if (!empty($this->minId)) {
 242                                         $this->minId = $minId;
 243                                 } else {
 244                                         // In any other case, the lookup continues backwards in time
 245                                         $this->maxId = $maxId;
 246                                 }
 247
 248                                 if (count($selected_items) < $this->itemsPerPage) {
 249                                         $items = $this->getRawChannelItems();
 250                                 }
 251                         }
 252                 } else {
 253                         $selected_items = $items;
 254                 }
 255
 256                 $condition = ['unseen' => true, 'uid' => $this->session->getLocalUserId(), 'parent-uri-id' => array_column($selected_items, 'uri-id')];
 257                 $this->setItemsSeenByCondition($condition);
 258
 259                 return $selected_items;
 260         }
 261
 262         /**
 263          * Database query for the channel page
 264          *
 265          * @return array
 266          * @throws \Exception
 267          */
 268         private function getRawChannelItems()
 269         {
 270                 $uid = $this->session->getLocalUserId();
 271
 272                 if ($this->selectedTab == TimelineEntity::WHATSHOT) {
 273                         if (!is_null($this->accountType)) {
 274                                 $condition = ["(`comments` > ? OR `activities` > ?) AND `contact-type` = ?", $this->getMedianComments($uid, 4), $this->getMedianActivities($uid, 4), $this->accountType];
 275                         } else {
 276                                 $condition = ["(`comments` > ? OR `activities` > ?) AND `contact-type` != ?", $this->getMedianComments($uid, 4), $this->getMedianActivities($uid, 4), Contact::TYPE_COMMUNITY];
 277                         }
 278                 } elseif ($this->selectedTab == TimelineEntity::FORYOU) {
 279                         $cid = Contact::getPublicIdByUserId($uid);
 280
 281                         $condition = [
 282                                 "(`owner-id` IN (SELECT `cid` FROM `contact-relation` WHERE `relation-cid` = ? AND `relation-thread-score` > ?) OR
 283                                 ((`comments` >= ? OR `activities` >= ?) AND `owner-id` IN (SELECT `cid` FROM `contact-relation` WHERE `follows` AND `relation-cid` = ?)) OR
 284                                 (`owner-id` IN (SELECT `cid` FROM `user-contact` WHERE `uid` = ? AND (`notify_new_posts` OR `channel-frequency` = ?))))",
 285                                 $cid, $this->getMedianRelationThreadScore($cid, 4), $this->getMedianComments($uid, 4), $this->getMedianActivities($uid, 4), $cid,
 286                                 $uid, Contact\User::FREQUENCY_ALWAYS
 287                         ];
 288                 } elseif ($this->selectedTab == TimelineEntity::FOLLOWERS) {
 289                         $condition = ["`owner-id` IN (SELECT `pid` FROM `account-user-view` WHERE `uid` = ? AND `rel` = ?)", $uid, Contact::FOLLOWER];
 290                 } elseif ($this->selectedTab == TimelineEntity::SHARERSOFSHARERS) {
 291                         $cid = Contact::getPublicIdByUserId($uid);
 292
 293                         // @todo Suggest posts from contacts that are followed most by our followers
 294                         $condition = [
 295                                 "`owner-id` IN (SELECT `cid` FROM `contact-relation` WHERE `follows` AND `last-interaction` > ?
 296                                 AND `relation-cid` IN (SELECT `cid` FROM `contact-relation` WHERE `follows` AND `relation-cid` = ? AND `relation-thread-score` >= ?)
 297                                 AND NOT `cid` IN (SELECT `cid` FROM `contact-relation` WHERE `follows` AND `relation-cid` = ?))",
 298                                 DateTimeFormat::utc('now - ' . $this->config->get('channel', 'sharer_interaction_days') . ' day'), $cid, $this->getMedianRelationThreadScore($cid, 4), $cid
 299                         ];
 300                 } elseif ($this->selectedTab == TimelineEntity::IMAGE) {
 301                         $condition = ["`media-type` & ?", 1];
 302                 } elseif ($this->selectedTab == TimelineEntity::VIDEO) {
 303                         $condition = ["`media-type` & ?", 2];
 304                 } elseif ($this->selectedTab == TimelineEntity::AUDIO) {
 305                         $condition = ["`media-type` & ?", 4];
 306                 } elseif ($this->selectedTab == TimelineEntity::LANGUAGE) {
 307                         $condition = ["JSON_EXTRACT(JSON_KEYS(language), '$[0]') = ?", $this->l10n->convertCodeForLanguageDetection(User::getLanguageCode($uid))];
 308                 } elseif (is_numeric($this->selectedTab)) {
 309                         $condition = $this->getUserChannelConditions($this->selectedTab, $this->session->getLocalUserId());
 310                 }
 311
 312                 if ($this->selectedTab != TimelineEntity::LANGUAGE) {
 313                         $condition = $this->addLanguageCondition($uid, $condition);
 314                 }
 315
 316                 $condition = DBA::mergeConditions($condition, ["(NOT `restricted` OR EXISTS(SELECT `id` FROM `post-user` WHERE `uid` = ? AND `uri-id` = `post-engagement`.`uri-id`))", $uid]);
 317
 318                 $condition = DBA::mergeConditions($condition, ["NOT EXISTS(SELECT `cid` FROM `user-contact` WHERE `uid` = ? AND `cid` = `post-engagement`.`owner-id` AND (`ignored` OR `blocked` OR `collapsed` OR `is-blocked` OR `channel-frequency` = ?))", $uid, Contact\User::FREQUENCY_NEVER]);
 319
 320                 if (($this->selectedTab != TimelineEntity::WHATSHOT) && !is_null($this->accountType)) {
 321                         $condition = DBA::mergeConditions($condition, ['contact-type' => $this->accountType]);
 322                 }
 323
 324                 $params = ['order' => ['created' => true], 'limit' => $this->itemsPerPage];
 325
 326                 if (!empty($this->itemUriId)) {
 327                         $condition = DBA::mergeConditions($condition, ['uri-id' => $this->itemUriId]);
 328                 } else {
 329                         if ($this->noSharer) {
 330                                 $condition = DBA::mergeConditions($condition, ["NOT `uri-id` IN (SELECT `uri-id` FROM `post-user` WHERE `post-user`.`uid` = ? AND `post-user`.`uri-id` = `post-engagement`.`uri-id`)", $this->session->getLocalUserId()]);
 331                         }
 332
 333                         if (isset($this->maxId)) {
 334                                 $condition = DBA::mergeConditions($condition, ["`created` < ?", $this->maxId]);
 335                         }
 336
 337                         if (isset($this->minId)) {
 338                                 $condition = DBA::mergeConditions($condition, ["`created` > ?", $this->minId]);
 339
 340                                 // Previous page case: we want the items closest to min_id but for that we need to reverse the query order
 341                                 if (!isset($this->maxId)) {
 342                                         $params['order']['created'] = false;
 343                                 }
 344                         }
 345                 }
 346
 347                 $items = [];
 348                 $result = $this->database->select('post-engagement', ['uri-id', 'created', 'owner-id', 'comments', 'activities'], $condition, $params);
 349                 while ($item = $this->database->fetch($result)) {
 350                         $items[$item['uri-id']] = $item;
 351                 }
 352                 $this->database->close($result);
 353
 354                 if (empty($items)) {
 355                         return [];
 356                 }
 357
 358                 // Previous page case: once we get the relevant items closest to min_id, we need to restore the expected display order
 359                 if (empty($this->itemUriId) && isset($this->minId) && !isset($this->maxId)) {
 360                         $items = array_reverse($items, true);
 361                 }
 362
 363                 $condition = ['unseen' => true, 'uid' => $uid, 'parent-uri-id' => array_column($items, 'uri-id')];
 364                 $this->setItemsSeenByCondition($condition);
 365
 366                 return $items;
 367         }
 368
 369         private function getUserChannelConditions(int $id, int $uid): array
 370         {
 371                 $channel = $this->channel->selectById($id, $uid);
 372                 if (empty($channel)) {
 373                         return [];
 374                 }
 375
 376                 $condition = [];
 377
 378                 if (!empty($channel->fullTextSearch)) {
 379                         $first     = $this->database->selectFirst('post-engagement', ['uri-id']);
 380                         $condition = DBA::mergeConditions($condition, ["`uri-id` IN (SELECT `uri-id` FROM `post-content` WHERE `uri-id` >= ? AND MATCH (`title`, `content-warning`, `body`) AGAINST (? IN BOOLEAN MODE))", $first['uri-id'], $channel->fullTextSearch]);
 381                 }
 382
 383                 if (!empty($channel->includeTags)) {
 384                         $search       = explode(',', mb_strtolower($channel->includeTags));
 385                         $placeholders = substr(str_repeat("?, ", count($search)), 0, -2);
 386                         $condition    = DBA::mergeConditions($condition, array_merge(["`uri-id` IN (SELECT `uri-id` FROM `post-tag` INNER JOIN `tag` ON `tag`.`id` = `post-tag`.`tid` WHERE `post-tag`.`type` = 1 AND `name` IN (" . $placeholders . "))"], $search));
 387                 }
 388
 389                 if (!empty($channel->excludeTags)) {
 390                         $search       = explode(',', mb_strtolower($channel->excludeTags));
 391                         $placeholders = substr(str_repeat("?, ", count($search)), 0, -2);
 392                         $condition    = DBA::mergeConditions($condition, array_merge(["NOT `uri-id` IN (SELECT `uri-id` FROM `post-tag` INNER JOIN `tag` ON `tag`.`id` = `post-tag`.`tid` WHERE `post-tag`.`type` = 1 AND `name` IN (" . $placeholders . "))"], $search));
 393                 }
 394
 395                 if (!empty($channel->mediaType)) {
 396                         $condition = DBA::mergeConditions($condition, ["`media-type` & ?", $channel->mediaType]);
 397                 }
 398
 399                 return $condition;
 400         }
 401
 402         private function addLanguageCondition(int $uid, array $condition): array
 403         {
 404                 $conditions = [];
 405                 $languages  = $this->pConfig->get($uid, 'channel', 'languages', [User::getLanguageCode($uid)]);
 406                 $languages  = $this->l10n->convertForLanguageDetection($languages);
 407                 foreach ($languages as $language) {
 408                         $conditions[] = "JSON_EXTRACT(JSON_KEYS(language), '$[0]') = ?";
 409                         $condition[]  = $language;
 410                 }
 411                 if (!empty($conditions)) {
 412                         $condition[0] .= " AND (`language` IS NULL OR " . implode(' OR ', $conditions) . ")";
 413                 }
 414                 return $condition;
 415         }
 416
 417         private function getMedianComments(int $uid, int $divider): int
 418         {
 419                 $languages = $this->pConfig->get($uid, 'channel', 'languages', [User::getLanguageCode($uid)]);
 420                 $cache_key = 'Channel:getMedianComments:' . $divider . ':' . implode(':', $languages);
 421                 $comments  = $this->cache->get($cache_key);
 422                 if (!empty($comments)) {
 423                         return $comments;
 424                 }
 425
 426                 $condition = ["`contact-type` != ? AND `comments` > ? AND NOT `restricted`", Contact::TYPE_COMMUNITY, 0];
 427                 $condition = $this->addLanguageCondition($uid, $condition);
 428
 429                 $limit    = $this->database->count('post-engagement', $condition) / $divider;
 430                 $post     = $this->database->selectToArray('post-engagement', ['comments'], $condition, ['order' => ['comments' => true], 'limit' => [$limit, 1]]);
 431                 $comments = $post[0]['comments'] ?? 0;
 432                 if (empty($comments)) {
 433                         return 0;
 434                 }
 435
 436                 $this->cache->set($cache_key, $comments, Duration::HALF_HOUR);
 437                 $this->logger->debug('Calculated median comments', ['divider' => $divider, 'languages' => $languages, 'median' => $comments]);
 438                 return $comments;
 439         }
 440
 441         private function getMedianActivities(int $uid, int $divider): int
 442         {
 443                 $languages  = $this->pConfig->get($uid, 'channel', 'languages', [User::getLanguageCode($uid)]);
 444                 $cache_key  = 'Channel:getMedianActivities:' . $divider . ':' . implode(':', $languages);
 445                 $activities = $this->cache->get($cache_key);
 446                 if (!empty($activities)) {
 447                         return $activities;
 448                 }
 449
 450                 $condition = ["`contact-type` != ? AND `activities` > ? AND NOT `restricted`", Contact::TYPE_COMMUNITY, 0];
 451                 $condition = $this->addLanguageCondition($uid, $condition);
 452
 453                 $limit      = $this->database->count('post-engagement', $condition) / $divider;
 454                 $post       = $this->database->selectToArray('post-engagement', ['activities'], $condition, ['order' => ['activities' => true], 'limit' => [$limit, 1]]);
 455                 $activities = $post[0]['activities'] ?? 0;
 456                 if (empty($activities)) {
 457                         return 0;
 458                 }
 459
 460                 $this->cache->set($cache_key, $activities, Duration::HALF_HOUR);
 461                 $this->logger->debug('Calculated median activities', ['divider' => $divider, 'languages' => $languages, 'median' => $activities]);
 462                 return $activities;
 463         }
 464
 465         private function getMedianRelationThreadScore(int $cid, int $divider): int
 466         {
 467                 $cache_key = 'Channel:getThreadScore:' . $cid . ':' . $divider;
 468                 $score     = $this->cache->get($cache_key);
 469                 if (!empty($score)) {
 470                         return $score;
 471                 }
 472
 473                 $condition = ["`relation-cid` = ? AND `relation-thread-score` > ?", $cid, 0];
 474
 475                 $limit    = $this->database->count('contact-relation', $condition) / $divider;
 476                 $relation = $this->database->selectToArray('contact-relation', ['relation-thread-score'], $condition, ['order' => ['relation-thread-score' => true], 'limit' => [$limit, 1]]);
 477                 $score    = $relation[0]['relation-thread-score'] ?? 0;
 478                 if (empty($score)) {
 479                         return 0;
 480                 }
 481
 482                 $this->cache->set($cache_key, $score, Duration::HALF_HOUR);
 483                 $this->logger->debug('Calculated median score', ['cid' => $cid, 'divider' => $divider, 'median' => $score]);
 484                 return $score;
 485         }
 486
 487         /**
 488          * Computes the displayed items.
 489          *
 490          * Community pages have a restriction on how many successive posts by the same author can show on any given page,
 491          * so we may have to retrieve more content beyond the first query
 492          *
 493          * @return array
 494          * @throws \Exception
 495          */
 496         protected function getCommunityItems()
 497         {
 498                 $items = $this->selectItems();
 499
 500                 $maxpostperauthor = (int) $this->config->get('system', 'max_author_posts_community_page');
 501                 if ($maxpostperauthor != 0 && $this->selectedTab == 'local') {
 502                         $count          = 1;
 503                         $previousauthor = '';
 504                         $numposts       = 0;
 505                         $selected_items = [];
 506
 507                         while (count($selected_items) < $this->itemsPerPage && ++$count < 50 && count($items) > 0) {
 508                                 foreach ($items as $item) {
 509                                         if ($previousauthor == $item["author-link"]) {
 510                                                 ++$numposts;
 511                                         } else {
 512                                                 $numposts = 0;
 513                                         }
 514                                         $previousauthor = $item["author-link"];
 515
 516                                         if (($numposts < $maxpostperauthor) && (count($selected_items) < $this->itemsPerPage)) {
 517                                                 $selected_items[] = $item;
 518                                         }
 519                                 }
 520
 521                                 // If we're looking at a "previous page", the lookup continues forward in time because the list is
 522                                 // sorted in chronologically decreasing order
 523                                 if (isset($this->minId)) {
 524                                         $this->minId = $items[0]['received'];
 525                                 } else {
 526                                         // In any other case, the lookup continues backwards in time
 527                                         $this->maxId = $items[count($items) - 1]['received'];
 528                                 }
 529
 530                                 $items = $this->selectItems();
 531                         }
 532                 } else {
 533                         $selected_items = $items;
 534                 }
 535
 536                 $condition = ['unseen' => true, 'uid' => $this->session->getLocalUserId(), 'parent-uri-id' => array_column($selected_items, 'uri-id')];
 537                 $this->setItemsSeenByCondition($condition);
 538
 539                 return $selected_items;
 540         }
 541
 542         /**
 543          * Database query for the community page
 544          *
 545          * @return array
 546          * @throws \Exception
 547          * @TODO Move to repository/factory
 548          */
 549         private function selectItems()
 550         {
 551                 if ($this->selectedTab == 'local') {
 552                         $condition = ["`wall` AND `origin` AND `private` = ?", Item::PUBLIC];
 553                 } elseif ($this->selectedTab == 'global') {
 554                         $condition = ["`uid` = ? AND `private` = ?", 0, Item::PUBLIC];
 555                 } else {
 556                         return [];
 557                 }
 558
 559                 if (!is_null($this->accountType)) {
 560                         $condition = DBA::mergeConditions($condition, ['owner-contact-type' => $this->accountType]);
 561                 }
 562
 563                 $params = ['order' => ['received' => true], 'limit' => $this->itemsPerPage];
 564
 565                 if (!empty($this->itemUriId)) {
 566                         $condition = DBA::mergeConditions($condition, ['uri-id' => $this->itemUriId]);
 567                 } else {
 568                         if ($this->session->getLocalUserId() && $this->noSharer) {
 569                                 $condition = DBA::mergeConditions($condition, ["NOT `uri-id` IN (SELECT `uri-id` FROM `post-user` WHERE `post-user`.`uid` = ? AND `post-user`.`uri-id` = `post-thread-user-view`.`uri-id`)", $this->session->getLocalUserId()]);
 570                         }
 571
 572                         if (isset($this->maxId)) {
 573                                 $condition = DBA::mergeConditions($condition, ["`received` < ?", $this->maxId]);
 574                         }
 575
 576                         if (isset($this->minId)) {
 577                                 $condition = DBA::mergeConditions($condition, ["`received` > ?", $this->minId]);
 578
 579                                 // Previous page case: we want the items closest to min_id but for that we need to reverse the query order
 580                                 if (!isset($this->maxId)) {
 581                                         $params['order']['received'] = false;
 582                                 }
 583                         }
 584                 }
 585
 586                 $r = Post::selectThreadForUser($this->session->getLocalUserId() ?: 0, ['uri-id', 'received', 'author-link'], $condition, $params);
 587
 588                 $items = Post::toArray($r);
 589                 if (empty($items)) {
 590                         return [];
 591                 }
 592
 593                 // Previous page case: once we get the relevant items closest to min_id, we need to restore the expected display order
 594                 if (empty($this->itemUriId) && isset($this->minId) && !isset($this->maxId)) {
 595                         $items = array_reverse($items);
 596                 }
 597
 598                 return $items;
 599         }
 600
 601         /**
 602          * Sets items as seen
 603          *
 604          * @param array $condition The array with the SQL condition
 605          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 606          */
 607         protected function setItemsSeenByCondition(array $condition)
 608         {
 609                 if (empty($condition)) {
 610                         return;
 611                 }
 612
 613                 $unseen = Post::exists($condition);
 614
 615                 if ($unseen) {
 616                         /// @todo handle huge "unseen" updates in the background to avoid timeout errors
 617                         Item::update(['unseen' => false], $condition);
 618                 }
 619         }
 620 }