}

	StringID GetNewVehicleMessageString(int widget) const

	{

		assert(this->ni->reftype1 == NR_ENGINE);

		EngineID engine = this->ni->ref1;

		switch (widget) {

			case WID_N_VEH_TITLE:

				SetDParam(0, GetEngineCategoryName(engine));

				return STR_NEWS_NEW_VEHICLE_NOW_AVAILABLE;

			case WID_N_VEH_NAME:

				SetDParam(0, engine);

				return STR_NEWS_NEW_VEHICLE_TYPE;

			default:

				NOT_REACHED();

		}

	}

};

/* static */ int NewsWindow::duration = 0; // Instance creation.

/** Open up an own newspaper window for the news item */

static void ShowNewspaper(const NewsItem *ni)

{

	SoundFx sound = _news_type_data[ni->type].sound;

	if (sound != 0 && _settings_client.sound.news_full) SndPlayFx(sound);

	new NewsWindow(GetNewsWindowLayout(ni->flags), ni);

}

/** Show news item in the ticker */

static void ShowTicker(const NewsItem *ni)

{

	if (_settings_client.sound.news_ticker) SndPlayFx(SND_16_MORSE);

	_statusbar_news_item = ni;

	InvalidateWindowData(WC_STATUS_BAR, 0, SBI_SHOW_TICKER);

}

/** Initialize the news-items data structures */

void InitNewsItemStructs()

{

	for (NewsItem *ni = _oldest_news; ni != nullptr; ) {

		NewsItem *next = ni->next;

		delete ni;

		ni = next;

	}

	_total_news = 0;

	_oldest_news = nullptr;

	_latest_news = nullptr;

	_forced_news = nullptr;

	_current_news = nullptr;

	_statusbar_news_item = nullptr;

	NewsWindow::duration = 0;

}

/**

 * Are we ready to show another ticker item?

 * Only if nothing is in the newsticker is displayed

 */

static bool ReadyForNextTickerItem()

{

	const NewsItem *ni = _statusbar_news_item;

	if (ni == nullptr) return true;

	/* Ticker message

	 * Check if the status bar message is still being displayed? */

	if (IsNewsTickerShown()) return false;

	return true;

}

/**

 * Are we ready to show another news item?

 * Only if no newspaper is displayed

 */

static bool ReadyForNextNewsItem()

{

	const NewsItem *ni = _forced_news == nullptr ? _current_news : _forced_news;

	if (ni == nullptr) return true;

	/* neither newsticker nor newspaper are running */

	return (NewsWindow::duration <= 0 || FindWindowById(WC_NEWS_WINDOW, 0) == nullptr);

}

/** Move to the next ticker item */

static void MoveToNextTickerItem()

{

	/* There is no status bar, so no reason to show news;

	 * especially important with the end game screen when

	 * there is no status bar but possible news. */

	if (FindWindowById(WC_STATUS_BAR, 0) == nullptr) return;

	/* if we're not at the last item, then move on */

	while (_statusbar_news_item != _latest_news) {

		_statusbar_news_item = (_statusbar_news_item == nullptr) ? _oldest_news : _statusbar_news_item->next;

		const NewsItem *ni = _statusbar_news_item;

		const NewsType type = ni->type;

		/* check the date, don't show too old items */

		if (_date - _news_type_data[type].age > ni->date) continue;

		switch (_news_type_data[type].GetDisplay()) {

			default: NOT_REACHED();

			case ND_OFF: // Off - show nothing only a small reminder in the status bar

				InvalidateWindowData(WC_STATUS_BAR, 0, SBI_SHOW_REMINDER);

				break;

			case ND_SUMMARY: // Summary - show ticker

				ShowTicker(ni);

				break;

			case ND_FULL: // Full - show newspaper, skipped here

				continue;

		}

		return;

	}

}

/** Move to the next news item */

static void MoveToNextNewsItem()

{

	/* There is no status bar, so no reason to show news;

	 * especially important with the end game screen when

	 * there is no status bar but possible news. */

	if (FindWindowById(WC_STATUS_BAR, 0) == nullptr) return;

	DeleteWindowById(WC_NEWS_WINDOW, 0); // close the newspapers window if shown

	_forced_news = nullptr;

	/* if we're not at the last item, then move on */

	while (_current_news != _latest_news) {

		_current_news = (_current_news == nullptr) ? _oldest_news : _current_news->next;

		const NewsItem *ni = _current_news;

		const NewsType type = ni->type;

		/* check the date, don't show too old items */

		if (_date - _news_type_data[type].age > ni->date) continue;

		switch (_news_type_data[type].GetDisplay()) {

			default: NOT_REACHED();

			case ND_OFF: // Off - show nothing only a small reminder in the status bar, skipped here

				continue;

			case ND_SUMMARY: // Summary - show ticker, skipped here

				continue;

			case ND_FULL: // Full - show newspaper

				ShowNewspaper(ni);

				break;

		}

		return;

	}

}

/** Delete a news item from the queue */

static void DeleteNewsItem(NewsItem *ni)

{

	/* Delete the news from the news queue. */

	if (ni->prev != nullptr) {

		ni->prev->next = ni->next;

	} else {

		assert(_oldest_news == ni);

		_oldest_news = ni->next;

	}

	if (ni->next != nullptr) {

		ni->next->prev = ni->prev;

	} else {

		assert(_latest_news == ni);

		_latest_news = ni->prev;

	}

	_total_news--;

	if (_forced_news == ni || _current_news == ni) {

		/* When we're the current news, go to the previous item first;

		 * we just possibly made that the last news item. */

		if (_current_news == ni) _current_news = ni->prev;

		/* About to remove the currently forced item (shown as newspapers) ||

		 * about to remove the currently displayed item (newspapers) */

		MoveToNextNewsItem();

	}

	if (_statusbar_news_item == ni) {

		/* When we're the current news, go to the previous item first;

		 * we just possibly made that the last news item. */

		_statusbar_news_item = ni->prev;

		/* About to remove the currently displayed item (ticker, or just a reminder) */

		MoveToNextTickerItem();

	}

	delete ni;

	SetWindowDirty(WC_MESSAGE_HISTORY, 0);

}

/**

 * Add a new newsitem to be shown.

 * @param string String to display

 * @param type news category

 * @param flags display flags for the news

 * @param reftype1 Type of ref1

 * @param ref1     Reference 1 to some object: Used for a possible viewport, scrolling after clicking on the news, and for deleting the news when the object is deleted.

 * @param reftype2 Type of ref2

 * @param ref2     Reference 2 to some object: Used for scrolling after clicking on the news, and for deleting the news when the object is deleted.

 * @param free_data Pointer to data that must be freed once the news message is cleared

 *

 * @see NewsSubtype

 */

void AddNewsItem(StringID string, NewsType type, NewsFlag flags, NewsReferenceType reftype1, uint32 ref1, NewsReferenceType reftype2, uint32 ref2, void *free_data)

{

	if (_game_mode == GM_MENU) return;

	/* Create new news item node */

	NewsItem *ni = new NewsItem;

	ni->string_id = string;

	ni->type = type;

	ni->flags = flags;

	/* show this news message in colour? */

	if (_cur_year >= _settings_client.gui.coloured_news_year) ni->flags |= NF_INCOLOUR;

	ni->reftype1 = reftype1;

	ni->reftype2 = reftype2;

	ni->ref1 = ref1;

	ni->ref2 = ref2;

	ni->free_data = free_data;

	ni->date = _date;

	CopyOutDParam(ni->params, 0, lengthof(ni->params));

	if (_total_news++ == 0) {

		assert(_oldest_news == nullptr);

		_oldest_news = ni;

		ni->prev = nullptr;

	} else {

		assert(_latest_news->next == nullptr);

		_latest_news->next = ni;

		ni->prev = _latest_news;

	}

	ni->next = nullptr;

	_latest_news = ni;

	/* Keep the number of stored news items to a managable number */

	if (_total_news > MAX_NEWS_AMOUNT) {

		DeleteNewsItem(_oldest_news);

	}

	SetWindowDirty(WC_MESSAGE_HISTORY, 0);

}

/**

 * Create a new custom news item.

 * @param tile unused

 * @param flags type of operation

 * @param p1 various bitstuffed elements

 * - p1 = (bit  0 -  7) - NewsType of the message.

 * - p1 = (bit  8 - 15) - NewsReferenceType of first reference.

 * - p1 = (bit 16 - 23) - Company this news message is for.

 * @param p2 First reference of the news message.

 * @param text The text of the news message.

 * @return the cost of this operation or an error

 */

CommandCost CmdCustomNewsItem(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)

{

	if (_current_company != OWNER_DEITY) return CMD_ERROR;

	NewsType type = (NewsType)GB(p1, 0, 8);

	NewsReferenceType reftype1 = (NewsReferenceType)GB(p1, 8, 8);

	CompanyID company = (CompanyID)GB(p1, 16, 8);

	if (company != INVALID_OWNER && !Company::IsValidID(company)) return CMD_ERROR;

	if (type >= NT_END) return CMD_ERROR;

	if (StrEmpty(text)) return CMD_ERROR;

	switch (reftype1) {

		case NR_NONE: break;

		case NR_TILE:

			if (!IsValidTile(p2)) return CMD_ERROR;

			break;

		case NR_VEHICLE:

			if (!Vehicle::IsValidID(p2)) return CMD_ERROR;