".__('No feed selected.');
		$reply['headlines']['content'] .= "
";
		$sth = $this->pdo->prepare("SELECT ".SUBSTRING_FOR_DATE."(MAX(last_updated), 1, 19) AS last_updated FROM ttrss_feeds
			WHERE owner_uid = ?");
		$sth->execute([$_SESSION['uid']]);
		$row = $sth->fetch();
		$last_updated = make_local_datetime($row["last_updated"], false);
		$reply['headlines']['content'] .= sprintf(__("Feeds last updated at %s"), $last_updated);
		$sth = $this->pdo->prepare("SELECT COUNT(id) AS num_errors
			FROM ttrss_feeds WHERE last_error != '' AND owner_uid = ?");
		$sth->execute([$_SESSION['uid']]);
		$row = $sth->fetch();
		$num_errors = $row["num_errors"];
		if ($num_errors > 0) {
			$reply['headlines']['content'] .= "
";
			$reply['headlines']['content'] .= "".
				__('Some feeds have update errors (click for details)')."";
		}
		$reply['headlines']['content'] .= "
";
		$reply['headlines-info'] = array("count" => 0,
			"unread" => 0,
			"disable_cache" => true);
		return $reply;
	}
	private function generate_error_feed($error) {
		$reply = array();
		$reply['headlines']['id'] = -7;
		$reply['headlines']['is_cat'] = false;
		$reply['headlines']['toolbar'] = '';
		$reply['headlines']['content'] = "
". $error . "
";
		$reply['headlines-info'] = array("count" => 0,
			"unread" => 0,
			"disable_cache" => true);
		return $reply;
	}
	function quickAddFeed() {
		print "
";
	}
	function search() {
		$this->params = explode(":", $_REQUEST["param"], 2);
		$active_feed_id = sprintf("%d", $this->params[0]);
		$is_cat = $this->params[1] != "false";
		print "
";
	}
	function update_debugger() {
		header("Content-type: text/html");
		Debug::set_enabled(true);
		Debug::set_loglevel($_REQUEST["xdebug"]);
		$feed_id = (int)$_REQUEST["feed_id"];
		@$do_update = $_REQUEST["action"] == "do_update";
		$csrf_token = $_REQUEST["csrf_token"];
		$sth = $this->pdo->prepare("SELECT id FROM ttrss_feeds WHERE id = ? AND owner_uid = ?");
		$sth->execute([$feed_id, $_SESSION['uid']]);
		if (!$sth->fetch()) {
		    print "Access denied.";
		    return;
        }
		$refetch_checked = isset($_REQUEST["force_refetch"]) ? "checked" : "";
		$rehash_checked = isset($_REQUEST["force_rehash"]) ? "checked" : "";
		?>
		
		
		
			
			
Feed Debugger
			
		
		
		
			
				Feed Debugger: getFeedTitle($feed_id) ?>
				
			 
		
		
		= 0) {
					if ($feed > 0) {
						$children = Feeds::getChildCategories($feed, $owner_uid);
						array_push($children, $feed);
						$children = array_map("intval", $children);
						$children = join(",", $children);
						$cat_qpart = "cat_id IN ($children)";
					} else {
						$cat_qpart = "cat_id IS NULL";
					}
					$sth = $pdo->prepare("UPDATE ttrss_user_entries
						SET unread = false, last_read = NOW() WHERE ref_id IN
							(SELECT id FROM
								(SELECT DISTINCT id FROM ttrss_entries, ttrss_user_entries WHERE ref_id = id
									AND owner_uid = ? AND unread = true AND feed_id IN
										(SELECT id FROM ttrss_feeds WHERE $cat_qpart) AND $date_qpart AND $search_qpart) as tmp)");
					$sth->execute([$owner_uid]);
				} else if ($feed == -2) {
					$sth = $pdo->prepare("UPDATE ttrss_user_entries
						SET unread = false,last_read = NOW() WHERE (SELECT COUNT(*)
							FROM ttrss_user_labels2, ttrss_entries WHERE article_id = ref_id AND id = ref_id AND $date_qpart AND $search_qpart) > 0
							AND unread = true AND owner_uid = ?");
					$sth->execute([$owner_uid]);
				}
			} else if ($feed > 0) {
				$sth = $pdo->prepare("UPDATE ttrss_user_entries
					SET unread = false, last_read = NOW() WHERE ref_id IN
						(SELECT id FROM
							(SELECT DISTINCT id FROM ttrss_entries, ttrss_user_entries WHERE ref_id = id
								AND owner_uid = ? AND unread = true AND feed_id = ? AND $date_qpart AND $search_qpart) as tmp)");
				$sth->execute([$owner_uid, $feed]);
			} else if ($feed < 0 && $feed > LABEL_BASE_INDEX) { // special, like starred
				if ($feed == -1) {
					$sth = $pdo->prepare("UPDATE ttrss_user_entries
						SET unread = false, last_read = NOW() WHERE ref_id IN
							(SELECT id FROM
								(SELECT DISTINCT id FROM ttrss_entries, ttrss_user_entries WHERE ref_id = id
									AND owner_uid = ? AND unread = true AND marked = true AND $date_qpart AND $search_qpart) as tmp)");
					$sth->execute([$owner_uid]);
				}
				if ($feed == -2) {
					$sth = $pdo->prepare("UPDATE ttrss_user_entries
						SET unread = false, last_read = NOW() WHERE ref_id IN
							(SELECT id FROM
								(SELECT DISTINCT id FROM ttrss_entries, ttrss_user_entries WHERE ref_id = id
									AND owner_uid = ? AND unread = true AND published = true AND $date_qpart AND $search_qpart) as tmp)");
					$sth->execute([$owner_uid]);
				}
				if ($feed == -3) {
					$intl = (int) get_pref("FRESH_ARTICLE_MAX_AGE");
					if (DB_TYPE == "pgsql") {
						$match_part = "date_entered > NOW() - INTERVAL '$intl hour' ";
					} else {
						$match_part = "date_entered > DATE_SUB(NOW(),
							INTERVAL $intl HOUR) ";
					}
					$sth = $pdo->prepare("UPDATE ttrss_user_entries
						SET unread = false, last_read = NOW() WHERE ref_id IN
							(SELECT id FROM
								(SELECT DISTINCT id FROM ttrss_entries, ttrss_user_entries WHERE ref_id = id
									AND owner_uid = ? AND score >= 0 AND unread = true AND $date_qpart AND $match_part AND $search_qpart) as tmp)");
					$sth->execute([$owner_uid]);
				}
				if ($feed == -4) {
					$sth = $pdo->prepare("UPDATE ttrss_user_entries
						SET unread = false, last_read = NOW() WHERE ref_id IN
							(SELECT id FROM
								(SELECT DISTINCT id FROM ttrss_entries, ttrss_user_entries WHERE ref_id = id
									AND owner_uid = ? AND unread = true AND $date_qpart AND $search_qpart) as tmp)");
					$sth->execute([$owner_uid]);
				}
			} else if ($feed < LABEL_BASE_INDEX) { // label
				$label_id = Labels::feed_to_label_id($feed);
				$sth = $pdo->prepare("UPDATE ttrss_user_entries
					SET unread = false, last_read = NOW() WHERE ref_id IN
						(SELECT id FROM
							(SELECT DISTINCT ttrss_entries.id FROM ttrss_entries, ttrss_user_entries, ttrss_user_labels2 WHERE ref_id = id
								AND label_id = ? AND ref_id = article_id
								AND owner_uid = ? AND unread = true AND $date_qpart AND $search_qpart) as tmp)");
				$sth->execute([$label_id, $owner_uid]);
			}
			CCache::update($feed, $owner_uid, $cat_view);
		} else { // tag
			$sth = $pdo->prepare("UPDATE ttrss_user_entries
				SET unread = false, last_read = NOW() WHERE ref_id IN
					(SELECT id FROM
						(SELECT DISTINCT ttrss_entries.id FROM ttrss_entries, ttrss_user_entries, ttrss_tags WHERE ref_id = ttrss_entries.id
							AND post_int_id = int_id AND tag_name = ?
							AND ttrss_user_entries.owner_uid = ? AND unread = true AND $date_qpart AND $search_qpart) as tmp)");
			$sth->execute([$feed, $owner_uid]);
		}
	}
	static function getFeedArticles($feed, $is_cat = false, $unread_only = false,
							 $owner_uid = false) {
		$n_feed = (int) $feed;
		$need_entries = false;
		$pdo = Db::pdo();
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];
		if ($unread_only) {
			$unread_qpart = "unread = true";
		} else {
			$unread_qpart = "true";
		}
		$match_part = "";
		if ($is_cat) {
			return Feeds::getCategoryUnread($n_feed, $owner_uid);
		} else if ($n_feed == -6) {
			return 0;
		} else if ($feed != "0" && $n_feed == 0) {
			$sth = $pdo->prepare("SELECT SUM((SELECT COUNT(int_id)
				FROM ttrss_user_entries,ttrss_entries WHERE int_id = post_int_id
					AND ref_id = id AND $unread_qpart)) AS count FROM ttrss_tags
				WHERE owner_uid = ? AND tag_name = ?");
			$sth->execute([$owner_uid, $feed]);
			$row = $sth->fetch();
			return $row["count"];
		} else if ($n_feed == -1) {
			$match_part = "marked = true";
		} else if ($n_feed == -2) {
			$match_part = "published = true";
		} else if ($n_feed == -3) {
			$match_part = "unread = true AND score >= 0";
			$intl = (int) get_pref("FRESH_ARTICLE_MAX_AGE", $owner_uid);
			if (DB_TYPE == "pgsql") {
				$match_part .= " AND date_entered > NOW() - INTERVAL '$intl hour' ";
			} else {
				$match_part .= " AND date_entered > DATE_SUB(NOW(), INTERVAL $intl HOUR) ";
			}
			$need_entries = true;
		} else if ($n_feed == -4) {
			$match_part = "true";
		} else if ($n_feed >= 0) {
			if ($n_feed != 0) {
				$match_part = "feed_id = " . (int)$n_feed;
			} else {
				$match_part = "feed_id IS NULL";
			}
		} else if ($feed < LABEL_BASE_INDEX) {
			$label_id = Labels::feed_to_label_id($feed);
			return Feeds::getLabelUnread($label_id, $owner_uid);
		}
		if ($match_part) {
			if ($need_entries) {
				$from_qpart = "ttrss_user_entries,ttrss_entries";
				$from_where = "ttrss_entries.id = ttrss_user_entries.ref_id AND";
			} else {
				$from_qpart = "ttrss_user_entries";
				$from_where = "";
			}
			$sth = $pdo->prepare("SELECT count(int_id) AS unread
				FROM $from_qpart WHERE
				$unread_qpart AND $from_where ($match_part) AND ttrss_user_entries.owner_uid = ?");
			$sth->execute([$owner_uid]);
			$row = $sth->fetch();
			return $row["unread"];
		} else {
			$sth = $pdo->prepare("SELECT COUNT(post_int_id) AS unread
				FROM ttrss_tags,ttrss_user_entries,ttrss_entries
				WHERE tag_name = ? AND post_int_id = int_id AND ref_id = ttrss_entries.id
				AND $unread_qpart AND ttrss_tags.owner_uid = ,");
			$sth->execute([$feed, $owner_uid]);
			$row = $sth->fetch();
			return $row["unread"];
		}
	}
	/**
	 * @return array (code => Status code, message => error message if available)
	 *
	 *                 0 - OK, Feed already exists
	 *                 1 - OK, Feed added
	 *                 2 - Invalid URL
	 *                 3 - URL content is HTML, no feeds available
	 *                 4 - URL content is HTML which contains multiple feeds.
	 *                     Here you should call extractfeedurls in rpc-backend
	 *                     to get all possible feeds.
	 *                 5 - Couldn't download the URL content.
	 *                 6 - Content is an invalid XML.
	 */
	static function subscribe_to_feed($url, $cat_id = 0,
							   $auth_login = '', $auth_pass = '') {
		global $fetch_last_error;
		global $fetch_last_error_content;
		$pdo = Db::pdo();
		$url = fix_url($url);
		if (!$url || !validate_feed_url($url)) return array("code" => 2);
		$contents = @fetch_file_contents($url, false, $auth_login, $auth_pass);
		foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_SUBSCRIBE_FEED) as $plugin) {
			$contents = $plugin->hook_subscribe_feed($contents, $url, $auth_login, $auth_pass);
		}
		if (!$contents) {
			if (preg_match("/cloudflare\.com/", $fetch_last_error_content)) {
				$fetch_last_error .= " (feed behind Cloudflare)";
			}
			return array("code" => 5, "message" => $fetch_last_error);
		}
		if (is_html($contents)) {
			$feedUrls = get_feeds_from_html($url, $contents);
			if (count($feedUrls) == 0) {
				return array("code" => 3);
			} else if (count($feedUrls) > 1) {
				return array("code" => 4, "feeds" => $feedUrls);
			}
			//use feed url as new URL
			$url = key($feedUrls);
		}
		if (!$cat_id) $cat_id = null;
		$sth = $pdo->prepare("SELECT id FROM ttrss_feeds
			WHERE feed_url = ? AND owner_uid = ?");
		$sth->execute([$url, $_SESSION['uid']]);
		if ($row = $sth->fetch()) {
			return array("code" => 0, "feed_id" => (int) $row["id"]);
		} else {
			$sth = $pdo->prepare(
				"INSERT INTO ttrss_feeds
					(owner_uid,feed_url,title,cat_id, auth_login,auth_pass,update_method,auth_pass_encrypted)
				VALUES (?, ?, ?, ?, ?, ?, 0, false)");
			$sth->execute([$_SESSION['uid'], $url, "[Unknown]", $cat_id, (string)$auth_login, (string)$auth_pass]);
			$sth = $pdo->prepare("SELECT id FROM ttrss_feeds WHERE feed_url = ?
					AND owner_uid = ?");
			$sth->execute([$url, $_SESSION['uid']]);
			$row = $sth->fetch();
			$feed_id = $row["id"];
			if ($feed_id) {
				RSSUtils::set_basic_feed_info($feed_id);
			}
			return array("code" => 1, "feed_id" => (int) $feed_id);
		}
	}
	static function getIconFile($feed_id) {
		return ICONS_DIR . "/$feed_id.ico";
	}
	static function feedHasIcon($id) {
		return is_file(ICONS_DIR . "/$id.ico") && filesize(ICONS_DIR . "/$id.ico") > 0;
	}
	static function getFeedIcon($id) {
		switch ($id) {
			case 0:
				return "archive";
				break;
			case -1:
				return "star";
				break;
			case -2:
				return "rss_feed";
				break;
			case -3:
				return "whatshot";
				break;
			case -4:
				return "inbox";
				break;
			case -6:
				return "restore";
				break;
			default:
				if ($id < LABEL_BASE_INDEX) {
					return "label";
				} else {
					$icon = self::getIconFile($id);
                    if ($icon && file_exists($icon)) {
						return ICONS_URL . "/" . basename($icon) . "?" . filemtime($icon);
					}
				}
				break;
		}
		return false;
	}
	static function getFeedTitle($id, $cat = false) {
	    $pdo = Db::pdo();
		if ($cat) {
			return Feeds::getCategoryTitle($id);
		} else if ($id == -1) {
			return __("Starred articles");
		} else if ($id == -2) {
			return __("Published articles");
		} else if ($id == -3) {
			return __("Fresh articles");
		} else if ($id == -4) {
			return __("All articles");
		} else if ($id === 0 || $id === "0") {
			return __("Archived articles");
		} else if ($id == -6) {
			return __("Recently read");
		} else if ($id < LABEL_BASE_INDEX) {
			$label_id = Labels::feed_to_label_id($id);
			$sth = $pdo->prepare("SELECT caption FROM ttrss_labels2 WHERE id = ?");
			$sth->execute([$label_id]);
			if ($row = $sth->fetch()) {
				return $row["caption"];
			} else {
				return "Unknown label ($label_id)";
			}
		} else if (is_numeric($id) && $id > 0) {
		    $sth = $pdo->prepare("SELECT title FROM ttrss_feeds WHERE id = ?");
		    $sth->execute([$id]);
		    if ($row = $sth->fetch()) {
				return $row["title"];
			} else {
				return "Unknown feed ($id)";
			}
		} else {
			return $id;
		}
	}
	static function getCategoryUnread($cat, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];
		$pdo = Db::pdo();
		if ($cat >= 0) {
		    if (!$cat) $cat = null;
			$sth = $pdo->prepare("SELECT id FROM ttrss_feeds
                    WHERE (cat_id = :cat OR (:cat IS NULL AND cat_id IS NULL))
					AND owner_uid = :uid");
			$sth->execute([":cat" => $cat, ":uid" => $owner_uid]);
			$cat_feeds = array();
			while ($line = $sth->fetch()) {
				array_push($cat_feeds, "feed_id = " . (int)$line["id"]);
			}
			if (count($cat_feeds) == 0) return 0;
			$match_part = implode(" OR ", $cat_feeds);
			$sth = $pdo->prepare("SELECT COUNT(int_id) AS unread
				FROM ttrss_user_entries
				WHERE	unread = true AND ($match_part)
				AND owner_uid = ?");
			$sth->execute([$owner_uid]);
			$unread = 0;
			# this needs to be rewritten
			while ($line = $sth->fetch()) {
				$unread += $line["unread"];
			}
			return $unread;
		} else if ($cat == -1) {
			return getFeedUnread(-1) + getFeedUnread(-2) + getFeedUnread(-3) + getFeedUnread(0);
		} else if ($cat == -2) {
			$sth = $pdo->prepare("SELECT COUNT(unread) AS unread FROM
					ttrss_user_entries, ttrss_user_labels2
				WHERE article_id = ref_id AND unread = true
					AND ttrss_user_entries.owner_uid = ?");
			$sth->execute([$owner_uid]);
            $row = $sth->fetch();
			return $row["unread"];
		}
	}
	// only accepts real cats (>= 0)
	static function getCategoryChildrenUnread($cat, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];
		$pdo = Db::pdo();
		$sth = $pdo->prepare("SELECT id FROM ttrss_feed_categories WHERE parent_cat = ?
				AND owner_uid = ?");
		$sth->execute([$cat, $owner_uid]);
		$unread = 0;
		while ($line = $sth->fetch()) {
			$unread += Feeds::getCategoryUnread($line["id"], $owner_uid);
			$unread += Feeds::getCategoryChildrenUnread($line["id"], $owner_uid);
		}
		return $unread;
	}
	static function getGlobalUnread($user_id = false) {
		if (!$user_id) $user_id = $_SESSION["uid"];
		$pdo = Db::pdo();
		$sth = $pdo->prepare("SELECT SUM(value) AS c_id FROM ttrss_counters_cache
			WHERE owner_uid = ? AND feed_id > 0");
		$sth->execute([$user_id]);
		$row = $sth->fetch();
		return $row["c_id"];
	}
	static function getCategoryTitle($cat_id) {
		if ($cat_id == -1) {
			return __("Special");
		} else if ($cat_id == -2) {
			return __("Labels");
		} else {
		    $pdo = Db::pdo();
			$sth = $pdo->prepare("SELECT title FROM ttrss_feed_categories WHERE
				id = ?");
			$sth->execute([$cat_id]);
			if ($row = $sth->fetch()) {
				return $row["title"];
			} else {
				return __("Uncategorized");
			}
		}
	}
	static function getLabelUnread($label_id, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];
		$pdo = Db::pdo();
		$sth = $pdo->prepare("SELECT COUNT(ref_id) AS unread FROM ttrss_user_entries, ttrss_user_labels2
			WHERE owner_uid = ? AND unread = true AND label_id = ? AND article_id = ref_id");
		$sth->execute([$owner_uid, $label_id]);
		if ($row = $sth->fetch()) {
			return $row["unread"];
		} else {
			return 0;
		}
	}
	static function queryFeedHeadlines($params) {
		$pdo = Db::pdo();
		// WARNING: due to highly dynamic nature of this query its going to quote parameters
        // right before adding them to SQL part
		$feed = $params["feed"];
		$limit = isset($params["limit"]) ? $params["limit"] : 30;
		$view_mode = $params["view_mode"];
		$cat_view = isset($params["cat_view"]) ? $params["cat_view"] : false;
		$search = isset($params["search"]) ? $params["search"] : false;
		$search_language = isset($params["search_language"]) ? $params["search_language"] : "";
		$override_order = isset($params["override_order"]) ? $params["override_order"] : false;
		$offset = isset($params["offset"]) ? $params["offset"] : 0;
		$owner_uid = isset($params["owner_uid"]) ? $params["owner_uid"] : $_SESSION["uid"];
		$since_id = isset($params["since_id"]) ? $params["since_id"] : 0;
		$include_children = isset($params["include_children"]) ? $params["include_children"] : false;
		$ignore_vfeed_group = isset($params["ignore_vfeed_group"]) ? $params["ignore_vfeed_group"] : false;
		$override_strategy = isset($params["override_strategy"]) ? $params["override_strategy"] : false;
		$override_vfeed = isset($params["override_vfeed"]) ? $params["override_vfeed"] : false;
		$start_ts = isset($params["start_ts"]) ? $params["start_ts"] : false;
		$check_first_id = isset($params["check_first_id"]) ? $params["check_first_id"] : false;
		$skip_first_id_check = isset($params["skip_first_id_check"]) ? $params["skip_first_id_check"] : false;
		$order_by = isset($params["order_by"]) ? $params["order_by"] : false;
		$ext_tables_part = "";
		$limit_query_part = "";
		$search_words = array();
		if ($search) {
			foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_SEARCH) as $plugin) {
				list($search_query_part, $search_words) = $plugin->hook_search($search);
				break;
			}
			// fall back in case of no plugins
			if (!$search_query_part) {
				list($search_query_part, $search_words) = search_to_sql($search, $search_language);
			}
			$search_query_part .= " AND ";
		} else {
			$search_query_part = "";
		}
		if ($since_id) {
			$since_id_part = "ttrss_entries.id > ".$pdo->quote($since_id)." AND ";
		} else {
			$since_id_part = "";
		}
		$view_query_part = "";
		if ($view_mode == "adaptive") {
			if ($search) {
				$view_query_part = " ";
			} else if ($feed != -1) {
				$unread = getFeedUnread($feed, $cat_view);
				if ($cat_view && $feed > 0 && $include_children)
					$unread += Feeds::getCategoryChildrenUnread($feed);
				if ($unread > 0) {
					$view_query_part = " unread = true AND ";
				}
			}
		}
		if ($view_mode == "marked") {
			$view_query_part = " marked = true AND ";
		}
		if ($view_mode == "has_note") {
			$view_query_part = " (note IS NOT NULL AND note != '') AND ";
		}
		if ($view_mode == "published") {
			$view_query_part = " published = true AND ";
		}
		if ($view_mode == "unread" && $feed != -6) {
			$view_query_part = " unread = true AND ";
		}
		if ($limit > 0) {
			$limit_query_part = "LIMIT " . (int)$limit;
		}
		$allow_archived = false;
		$vfeed_query_part = "";
		/* tags */
		if (!is_numeric($feed)) {
			$query_strategy_part = "true";
			$vfeed_query_part = "(SELECT title FROM ttrss_feeds WHERE
					id = feed_id) as feed_title,";
		} else if ($feed > 0) {
			if ($cat_view) {
				if ($feed > 0) {
					if ($include_children) {
						# sub-cats
						$subcats = Feeds::getChildCategories($feed, $owner_uid);
						array_push($subcats, $feed);
						$subcats = array_map("intval", $subcats);
						$query_strategy_part = "cat_id IN (".
							implode(",", $subcats).")";
					} else {
						$query_strategy_part = "cat_id = " . $pdo->quote($feed);
					}
				} else {
					$query_strategy_part = "cat_id IS NULL";
				}
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			} else {
				$query_strategy_part = "feed_id = " . $pdo->quote($feed);
			}
		} else if ($feed == 0 && !$cat_view) { // archive virtual feed
			$query_strategy_part = "feed_id IS NULL";
			$allow_archived = true;
		} else if ($feed == 0 && $cat_view) { // uncategorized
			$query_strategy_part = "cat_id IS NULL AND feed_id IS NOT NULL";
			$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
		} else if ($feed == -1) { // starred virtual feed
			$query_strategy_part = "marked = true";
			$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			$allow_archived = true;
			if (!$override_order) {
				$override_order = "last_marked DESC, date_entered DESC, updated DESC";
			}
		} else if ($feed == -2) { // published virtual feed OR labels category
			if (!$cat_view) {
				$query_strategy_part = "published = true";
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
				$allow_archived = true;
				if (!$override_order) {
					$override_order = "last_published DESC, date_entered DESC, updated DESC";
				}
			} else {
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
				$ext_tables_part = "ttrss_labels2,ttrss_user_labels2,";
				$query_strategy_part = "ttrss_labels2.id = ttrss_user_labels2.label_id AND
						ttrss_user_labels2.article_id = ref_id";
			}
		} else if ($feed == -6) { // recently read
			$query_strategy_part = "unread = false AND last_read IS NOT NULL";
			if (DB_TYPE == "pgsql") {
				$query_strategy_part .= " AND last_read > NOW() - INTERVAL '1 DAY' ";
			} else {
				$query_strategy_part .= " AND last_read > DATE_SUB(NOW(), INTERVAL 1 DAY) ";
			}
			$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			$allow_archived = true;
			$ignore_vfeed_group = true;
			if (!$override_order) $override_order = "last_read DESC";
		} else if ($feed == -3) { // fresh virtual feed
			$query_strategy_part = "unread = true AND score >= 0";
			$intl = (int) get_pref("FRESH_ARTICLE_MAX_AGE", $owner_uid);
			if (DB_TYPE == "pgsql") {
				$query_strategy_part .= " AND date_entered > NOW() - INTERVAL '$intl hour' ";
			} else {
				$query_strategy_part .= " AND date_entered > DATE_SUB(NOW(), INTERVAL $intl HOUR) ";
			}
			$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
		} else if ($feed == -4) { // all articles virtual feed
			$allow_archived = true;
			$query_strategy_part = "true";
			$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
		} else if ($feed <= LABEL_BASE_INDEX) { // labels
			$label_id = Labels::feed_to_label_id($feed);
			$query_strategy_part = "label_id = ".$pdo->quote($label_id)." AND
					ttrss_labels2.id = ttrss_user_labels2.label_id AND
					ttrss_user_labels2.article_id = ref_id";
			$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			$ext_tables_part = "ttrss_labels2,ttrss_user_labels2,";
			$allow_archived = true;
		} else {
			$query_strategy_part = "true";
		}
		$order_by = "score DESC, date_entered DESC, updated DESC";
		if ($override_order) {
			$order_by = $override_order;
		}
		if ($override_strategy) {
			$query_strategy_part = $override_strategy;
		}
		if ($override_vfeed) {
			$vfeed_query_part = $override_vfeed;
		}
		if ($search) {
			$feed_title = T_sprintf("Search results: %s", $search);
		} else {
			if ($cat_view) {
				$feed_title = Feeds::getCategoryTitle($feed);
			} else {
				if (is_numeric($feed) && $feed > 0) {
					$ssth = $pdo->prepare("SELECT title,site_url,last_error,last_updated
							FROM ttrss_feeds WHERE id = ? AND owner_uid = ?");
					$ssth->execute([$feed, $owner_uid]);
                    $row = $ssth->fetch();
					$feed_title = $row["title"];
					$feed_site_url = $row["site_url"];
					$last_error = $row["last_error"];
					$last_updated = $row["last_updated"];
				} else {
					$feed_title = Feeds::getFeedTitle($feed);
				}
			}
		}
		$content_query_part = "content, ";
		if ($limit_query_part) {
			$offset_query_part = "OFFSET " . (int)$offset;
		} else {
			$offset_query_part = "";
		}
		if (is_numeric($feed)) {
			// proper override_order applied above
			if ($vfeed_query_part && !$ignore_vfeed_group && get_pref('VFEED_GROUP_BY_FEED', $owner_uid)) {
                $yyiw_desc = $order_by == "date_reverse" ? "" : "desc";
				if (!$override_order) {
					$order_by = "yyiw $yyiw_desc, ttrss_feeds.title, ".$order_by;
				} else {
					$order_by = "yyiw $yyiw_desc, ttrss_feeds.title, ".$override_order;
				}
			}
			if (!$allow_archived) {
				$from_qpart = "${ext_tables_part}ttrss_entries LEFT JOIN ttrss_user_entries ON (ref_id = ttrss_entries.id),ttrss_feeds";
				$feed_check_qpart = "ttrss_user_entries.feed_id = ttrss_feeds.id AND";
			} else {
				$from_qpart = "${ext_tables_part}ttrss_entries LEFT JOIN ttrss_user_entries ON (ref_id = ttrss_entries.id)
						LEFT JOIN ttrss_feeds ON (feed_id = ttrss_feeds.id)";
			}
			if ($vfeed_query_part) $vfeed_query_part .= "favicon_avg_color,";
			if ($start_ts) {
				$start_ts_formatted = date("Y/m/d H:i:s", strtotime($start_ts));
				$start_ts_query_part = "date_entered >= '$start_ts_formatted' AND";
			} else {
				$start_ts_query_part = "";
			}
			$first_id = 0;
			$first_id_query_strategy_part = $query_strategy_part;
			if ($feed == -3)
				$first_id_query_strategy_part = "true";
			if (DB_TYPE == "pgsql") {
				$sanity_interval_qpart = "date_entered >= NOW() - INTERVAL '1 hour' AND";
				$yyiw_qpart = "to_char(date_entered, 'IYYY-IW') AS yyiw";
			} else {
				$sanity_interval_qpart = "date_entered >= DATE_SUB(NOW(), INTERVAL 1 hour) AND";
				$yyiw_qpart = "date_format(date_entered, '%Y-%u') AS yyiw";
			}
			if (!$search && !$skip_first_id_check) {
				// if previous topmost article id changed that means our current pagination is no longer valid
				$query = "SELECT DISTINCT
							ttrss_feeds.title,
							date_entered,
                            $yyiw_qpart,
							guid,
							ttrss_entries.id,
							ttrss_entries.title,
							updated,
							score,
							marked,
							published,
							last_marked,
							last_published,
							last_read
						FROM
							$from_qpart
						WHERE
						$feed_check_qpart
						ttrss_user_entries.owner_uid = ".$pdo->quote($owner_uid)." AND
						$search_query_part
						$start_ts_query_part
						$since_id_part
						$sanity_interval_qpart
						$first_id_query_strategy_part ORDER BY $order_by LIMIT 1";
				/*if ($_REQUEST["debug"]) {
					print $query;
				}*/
				$res = $pdo->query($query);
				if ($row = $res->fetch()) {
					$first_id = (int)$row["id"];
					if ($offset > 0 && $first_id && $check_first_id && $first_id != $check_first_id) {
						return array(-1, $feed_title, $feed_site_url, $last_error, $last_updated, $search_words, $first_id, $vfeed_query_part != "");
					}
				}
			}
			$query = "SELECT DISTINCT
						date_entered,
                        $yyiw_qpart,
						guid,
						ttrss_entries.id,ttrss_entries.title,
						updated,
						label_cache,
						tag_cache,
						always_display_enclosures,
						site_url,
						note,
						num_comments,
						comments,
						int_id,
						uuid,
						lang,
						hide_images,
						unread,feed_id,marked,published,link,last_read,orig_feed_id,
						last_marked, last_published,
						$vfeed_query_part
						$content_query_part
						author,score
					FROM
						$from_qpart
					WHERE
					$feed_check_qpart
					ttrss_user_entries.owner_uid = ".$pdo->quote($owner_uid)." AND
					$search_query_part
					$start_ts_query_part
					$view_query_part
					$since_id_part
					$query_strategy_part ORDER BY $order_by
					$limit_query_part $offset_query_part";
			//if ($_REQUEST["debug"]) print $query;
			$res = $pdo->query($query);
		} else {
			// browsing by tag
			$query = "SELECT DISTINCT
							date_entered,
							guid,
							note,
							ttrss_entries.id as id,
							title,
							updated,
							unread,
							feed_id,
							orig_feed_id,
							marked,
							published,
							num_comments,
							comments,
							int_id,
							tag_cache,
							label_cache,
							link,
							lang,
							uuid,
							last_read,
							(SELECT hide_images FROM ttrss_feeds WHERE id = feed_id) AS hide_images,
							last_marked, last_published,
							$since_id_part
							$vfeed_query_part
							$content_query_part
							author, score
						FROM ttrss_entries, ttrss_user_entries, ttrss_tags
						WHERE
							ref_id = ttrss_entries.id AND
							ttrss_user_entries.owner_uid = ".$pdo->quote($owner_uid)." AND
							post_int_id = int_id AND
							tag_name = ".$pdo->quote($feed)." AND
							$view_query_part
							$search_query_part
							$query_strategy_part ORDER BY $order_by
							$limit_query_part $offset_query_part";
			if ($_REQUEST["debug"]) print $query;
			$res = $pdo->query($query);
		}
		return array($res, $feed_title, $feed_site_url, $last_error, $last_updated, $search_words, $first_id, $vfeed_query_part != "");
	}
	static function getParentCategories($cat, $owner_uid) {
		$rv = array();
		$pdo = Db::pdo();
		$sth = $pdo->prepare("SELECT parent_cat FROM ttrss_feed_categories
			WHERE id = ? AND parent_cat IS NOT NULL AND owner_uid = ?");
		$sth->execute([$cat, $owner_uid]);
		while ($line = $sth->fetch()) {
			array_push($rv, $line["parent_cat"]);
			$rv = array_merge($rv, Feeds::getParentCategories($line["parent_cat"], $owner_uid));
		}
		return $rv;
	}
	static function getChildCategories($cat, $owner_uid) {
		$rv = array();
		$pdo = Db::pdo();
		$sth = $pdo->prepare("SELECT id FROM ttrss_feed_categories
			WHERE parent_cat = ? AND owner_uid = ?");
		$sth->execute([$cat, $owner_uid]);
		while ($line = $sth->fetch()) {
			array_push($rv, $line["id"]);
			$rv = array_merge($rv, Feeds::getChildCategories($line["id"], $owner_uid));
		}
		return $rv;
	}
	static function getFeedCategory($feed) {
		$pdo = Db::pdo();
	    $sth = $pdo->prepare("SELECT cat_id FROM ttrss_feeds
				WHERE id = ?");
	    $sth->execute([$feed]);
		if ($row = $sth->fetch()) {
			return $row["cat_id"];
		} else {
			return false;
		}
	}
    function color_of($name) {
        $colormap = [ "#1cd7d7","#d91111","#1212d7","#8e16e5","#7b7b7b",
            "#39f110","#0bbea6","#ec0e0e","#1534f2","#b9e416",
            "#479af2","#f36b14","#10c7e9","#1e8fe7","#e22727" ];
        $sum = 0;
        for ($i = 0; $i < strlen($name); $i++) {
            $sum += ord($name[$i]);
        }
        $sum %= count($colormap);
        return $colormap[$sum];
	}
}