/**
 * Build a buoy.
 * @param tile tile where to place the buoy
 * @param flags operation to perform
 * @param p1 unused
 * @param p2 unused
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdBuildBuoy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
	if (tile == 0) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);

	WaterClass wc;
	if ((flags & DC_PASTE) && !(flags & DC_EXEC)) {
		/* When pasting a buoy, there may be no water yet (a canal will be placed when DC_EXE'ing).
		 * Ignore that there is no water so we can calculate the cost more precisely. */
		wc = WATER_CLASS_INVALID;
	} else {
		if (!HasTileWaterGround(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
		wc = GetWaterClass(tile);
	}

	if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);

	if (!IsTileFlat(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);

	/* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
	Waypoint *wp = FindDeletedWaypointCloseTo(tile, STR_SV_STNAME_BUOY, OWNER_NONE);
	if (wp == NULL && !Waypoint::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_STATIONS_LOADING);

	CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_WAYPOINT_BUOY]);
	if (!IsWaterTile(tile)) {
		CommandCost ret = DoCommand(tile, 0, 0, flags | DC_AUTO, CMD_LANDSCAPE_CLEAR);
		if (ret.Failed()) return ret;
		cost.AddCost(ret);
	}

	if (flags & DC_EXEC) {
		if (wp == NULL) {
			wp = new Waypoint(tile);
		} else {
			/* Move existing (recently deleted) buoy to the new location */
			wp->xy = tile;
			InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
		}
		wp->rect.BeforeAddTile(tile, StationRect::ADD_TRY);

		wp->string_id = STR_SV_STNAME_BUOY;

		wp->facilities |= FACIL_DOCK;
		wp->owner = OWNER_NONE;

		wp->build_date = _date;

		if (wp->town == NULL) MakeDefaultName(wp);

		assert(wc != WATER_CLASS_INVALID);
		MakeBuoy(tile, wp->index, wc);

		wp->UpdateVirtCoord();
		InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
	}

	return cost;
}
void CopyPastePlaceBuoy(GenericTileIndex tile, StationID sid, WaterClass wc)
{
	if (IsMainMapTile(tile)) {
		TileIndex t = AsMainMapTile(tile);
		/* build a piece of canal if not on water */
		if (!HasTileWaterGround(t)) {
			CopyPastePlaceCannal(tile);
			if (_current_pasting->last_result.Failed()) return;
		}
		/* build the buoy */
		_current_pasting->DoCommand(t, 0, 0, CMD_BUILD_BUOY | CMD_MSG(STR_ERROR_CAN_T_POSITION_BUOY_HERE));
	} else {
		SetTileOwner(tile, OWNER_NONE);
		MakeBuoy(tile, sid, wc);
		_clipboard_stations_builder.AddPart(sid);
	}
}
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/**
 * Build a buoy.
 * @param tile tile where to place the buoy
 * @param flags operation to perform
 * @param p1 unused
 * @param p2 unused
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdBuildBuoy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
	if (tile == 0 || !HasTileWaterGround(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
	if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);

	if (GetTileSlope(tile) != SLOPE_FLAT) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);

	/* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
	Waypoint *wp = FindDeletedWaypointCloseTo(tile, STR_SV_STNAME_BUOY, OWNER_NONE);
	if (wp == NULL && !Waypoint::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_STATIONS_LOADING);

	CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_WAYPOINT_BUOY]);
	if (!IsWaterTile(tile)) {
		CommandCost ret = DoCommand(tile, 0, 0, flags | DC_AUTO, CMD_LANDSCAPE_CLEAR);
		if (ret.Failed()) return ret;
		cost.AddCost(ret);
	}

	if (flags & DC_EXEC) {
		if (wp == NULL) {
			wp = new Waypoint(tile);
		} else {
			/* Move existing (recently deleted) buoy to the new location */
			wp->xy = tile;
			InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
		}
		wp->rect.BeforeAddTile(tile, StationRect::ADD_TRY);

		wp->string_id = STR_SV_STNAME_BUOY;

		wp->facilities |= FACIL_DOCK;
		wp->owner = OWNER_NONE;

		wp->build_date = _date;

		if (wp->town == NULL) MakeDefaultName(wp);

		MakeBuoy(tile, wp->index, GetWaterClass(tile));

		wp->UpdateVirtCoord();
		InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
	}

	return cost;
}