/* $Id$ */

#include "stdafx.h"
#include <limits.h>
#include "openttd.h"
#include "debug.h"
#include "functions.h"
#include "road_map.h"
#include "station_map.h"
#include "table/strings.h"
#include "map.h"
#include "tile.h"
#include "vehicle.h"
#include "engine.h"
#include "command.h"
#include "station.h"
#include "news.h"
#include "pathfind.h"
#include "npf.h"
#include "player.h"
#include "sound.h"
#include "depot.h"
#include "tunnel_map.h"
#include "vehicle_gui.h"
#include "newgrf_engine.h"

static const uint16 _roadveh_images[63] = {
	0xCD4, 0xCDC, 0xCE4, 0xCEC, 0xCF4, 0xCFC, 0xD0C, 0xD14,
	0xD24, 0xD1C, 0xD2C, 0xD04, 0xD1C, 0xD24, 0xD6C, 0xD74,
	0xD7C, 0xC14, 0xC1C, 0xC24, 0xC2C, 0xC34, 0xC3C, 0xC4C,
	0xC54, 0xC64, 0xC5C, 0xC6C, 0xC44, 0xC5C, 0xC64, 0xCAC,
	0xCB4, 0xCBC, 0xD94, 0xD9C, 0xDA4, 0xDAC, 0xDB4, 0xDBC,
	0xDCC, 0xDD4, 0xDE4, 0xDDC, 0xDEC, 0xDC4, 0xDDC, 0xDE4,
	0xE2C, 0xE34, 0xE3C, 0xC14, 0xC1C, 0xC2C, 0xC3C, 0xC4C,
	0xC5C, 0xC64, 0xC6C, 0xC74, 0xC84, 0xC94, 0xCA4
};

static const uint16 _roadveh_full_adder[63] = {
	 0,  88,   0,   0,   0,   0,  48,  48,
	48,  48,   0,   0,  64,  64,   0,  16,
	16,   0,  88,   0,   0,   0,   0,  48,
	48,  48,  48,   0,   0,  64,  64,   0,
	16,  16,   0,  88,   0,   0,   0,   0,
	48,  48,  48,  48,   0,   0,  64,  64,
	 0,  16,  16,   0,   8,   8,   8,   8,
	 0,   0,   0,   8,   8,   8,   8
};


static const uint16 _road_veh_fp_ax_or[4] = {
	0x100,0x200,1,2,
};

static const uint16 _road_veh_fp_ax_and[4] = {
	0x1009, 0x16, 0x520, 0x2A00
};

static const byte _road_reverse_table[4] = {
	6, 7, 14, 15
};

static const uint16 _road_pf_table_3[4] = {
	0x910, 0x1600, 0x2005, 0x2A
};

int GetRoadVehImage(const Vehicle* v, Direction direction)
{
	int img = v->spritenum;
	int image;

	if (is_custom_sprite(img)) {
		image = GetCustomVehicleSprite(v, direction);
		if (image != 0) return image;
		img = orig_road_vehicle_info[v->engine_type - ROAD_ENGINES_INDEX].image_index;
	}

	image = direction + _roadveh_images[img];
	if (v->cargo_count >= v->cargo_cap / 2) image += _roadveh_full_adder[img];
	return image;
}

void DrawRoadVehEngine(int x, int y, EngineID engine, uint32 image_ormod)
{
	int spritenum = RoadVehInfo(engine)->image_index;

	if (is_custom_sprite(spritenum)) {
		int sprite = GetCustomVehicleIcon(engine, DIR_W);

		if (sprite != 0) {
			DrawSprite(sprite | image_ormod, x, y);
			return;
		}
		spritenum = orig_road_vehicle_info[engine - ROAD_ENGINES_INDEX].image_index;
	}
	DrawSprite((6 + _roadveh_images[spritenum]) | image_ormod, x, y);
}

static int32 EstimateRoadVehCost(EngineID engine_type)
{
	return ((_price.roadveh_base >> 3) * RoadVehInfo(engine_type)->base_cost) >> 5;
}

/** Build a road vehicle.
 * @param tile tile of depot where road vehicle is built
 * @param p1 bus/truck type being built (engine)
 * @param p2 unused
 */
int32 CmdBuildRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	int32 cost;
	Vehicle *v;
	UnitID unit_num;
	Engine *e;

	if (!IsEngineBuildable(p1, VEH_Road)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);

	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);

	cost = EstimateRoadVehCost(p1);
	if (flags & DC_QUERY_COST) return cost;

	/* The ai_new queries the vehicle cost before building the route,
	 * so we must check against cheaters no sooner than now. --pasky */
	if (!IsTileDepotType(tile, TRANSPORT_ROAD)) return CMD_ERROR;
	if (!IsTileOwner(tile, _current_player)) return CMD_ERROR;

	v = AllocateVehicle();
	if (v == NULL || IsOrderPoolFull())
		return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);

	/* find the first free roadveh id */
	unit_num = GetFreeUnitNumber(VEH_Road);
	if (unit_num > _patches.max_roadveh)
		return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);

	if (flags & DC_EXEC) {
		int x;
		int y;

		const RoadVehicleInfo *rvi = RoadVehInfo(p1);

		v->unitnumber = unit_num;
		v->direction = 0;
		v->owner = _current_player;

		v->tile = tile;
		x = TileX(tile) * TILE_SIZE + TILE_SIZE / 2;
		y = TileY(tile) * TILE_SIZE + TILE_SIZE / 2;
		v->x_pos = x;
		v->y_pos = y;
		v->z_pos = GetSlopeZ(x,y);
		v->z_height = 6;

		v->u.road.state = 254;
		v->vehstatus = VS_HIDDEN|VS_STOPPED|VS_DEFPAL;

		v->spritenum = rvi->image_index;
		v->cargo_type = rvi->cargo_type;
		v->cargo_cap = rvi->capacity;
//		v->cargo_count = 0;
		v->value = cost;
//		v->day_counter = 0;
//		v->next_order_param = v->next_order = 0;
//		v->load_unload_time_rem = 0;
//		v->progress = 0;

//	v->u.road.unk2 = 0;
//	v->u.road.overtaking = 0;

		v->last_station_visited = INVALID_STATION;
		v->max_speed = rvi->max_speed;
		v->engine_type = (byte)p1;

		e = GetEngine(p1);
		v->reliability = e->reliability;
		v->reliability_spd_dec = e->reliability_spd_dec;
		v->max_age = e->lifelength * 366;
		_new_roadveh_id = v->index;
		_new_vehicle_id = v->index;

		v->string_id = STR_SV_ROADVEH_NAME;

		v->service_interval = _patches.servint_roadveh;

		v->date_of_last_service = _date;
		v->build_year = _cur_year;

		v->type = VEH_Road;
		v->cur_image = 0xC15;
		v->random_bits = VehicleRandomBits();

		VehiclePositionChanged(v);

		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
		RebuildVehicleLists();
		InvalidateWindow(WC_COMPANY, v->owner);
		if (IsLocalPlayer())
			InvalidateWindow(WC_REPLACE_VEHICLE, VEH_Road); // updates the replace Road window
	}

	return cost;
}

/** Start/Stop a road vehicle.
 * @param tile unused
 * @param p1 road vehicle ID to start/stop
 * @param p2 unused
 */
int32 CmdStartStopRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	Vehicle *v;

	if (!IsVehicleIndex(p1)) return CMD_ERROR;

	v = GetVehicle(p1);

	if (v->type != VEH_Road || !CheckOwnership(v->owner)) return CMD_ERROR;

	if (flags & DC_EXEC) {
		if (v->vehstatus & VS_STOPPED && v->u.road.state == 254) {
			DeleteVehicleNews(p1, STR_9016_ROAD_VEHICLE_IS_WAITING);
		}

		v->vehstatus ^= VS_STOPPED;
		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
	}

	return 0;
}

void ClearSlot(Vehicle *v)
{
	RoadStop *rs = v->u.road.slot;
	if (v->u.road.slot == NULL) return;

	v->u.road.slot = NULL;
	v->u.road.slot_age = 0;

	assert(rs->num_vehicles != 0);
	rs->num_vehicles--;

	DEBUG(ms, 3) ("Multistop: Clearing slot at 0x%X", rs->xy);
}

/** Sell a road vehicle.
 * @param tile unused
 * @param p1 vehicle ID to be sold
 * @param p2 unused
 */
int32 CmdSellRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	Vehicle *v;

	if (!IsVehicleIndex(p1)) return CMD_ERROR;

	v = GetVehicle(p1);

	if (v->type != VEH_Road || !CheckOwnership(v->owner)) return CMD_ERROR;

	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);

	if (!IsTileDepotType(v->tile, TRANSPORT_ROAD) ||
			v->u.road.state != 254 ||
			!(v->vehstatus & VS_STOPPED)) {
		return_cmd_error(STR_9013_MUST_BE_STOPPED_INSIDE);
	}

	if (flags & DC_EXEC) {
		// Invalidate depot
		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
		RebuildVehicleLists();
		InvalidateWindow(WC_COMPANY, v->owner);
		DeleteWindowById(WC_VEHICLE_VIEW, v->index);
		ClearSlot(v);
		DeleteVehicle(v);
		if (IsLocalPlayer()) InvalidateWindow(WC_REPLACE_VEHICLE, VEH_Road);
	}

	return -(int32)v->value;
}

typedef struct RoadFindDepotData {
	uint best_length;
	TileIndex tile;
	byte owner;
} RoadFindDepotData;

static const DiagDirection _road_pf_directions[] = {
	DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE, 255, 255,
	DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE, 255, 255
};

static bool EnumRoadSignalFindDepot(TileIndex tile, void* data, int track, uint length, byte* state)
{
	RoadFindDepotData* rfdd = data;

	tile += TileOffsByDir(_road_pf_directions[track]);

	if (IsTileType(tile, MP_STREET) &&
			GetRoadType(tile) == ROAD_DEPOT &&
			IsTileOwner(tile, rfdd->owner) &&
			length < rfdd->best_length) {
		rfdd->best_length = length;
		rfdd->tile = tile;
	}
	return false;
}

static const Depot* FindClosestRoadDepot(const Vehicle* v)
{
	TileIndex tile = v->tile;

	if (v->u.road.state == 255) tile = GetVehicleOutOfTunnelTile(v);

	if (_patches.new_pathfinding_all) {
		NPFFoundTargetData ftd;
		/* See where we are now */
		Trackdir trackdir = GetVehicleTrackdir(v);

		ftd = NPFRouteToDepotBreadthFirst(v->tile, trackdir, TRANSPORT_ROAD, v->owner, INVALID_RAILTYPE);
		if (ftd.best_bird_dist == 0) {
			return GetDepotByTile(ftd.node.tile); /* Target found */
		} else {
			return NULL; /* Target not found */
		}
		/* We do not search in two directions here, why should we? We can't reverse right now can we? */
	} else {
		RoadFindDepotData rfdd;
		DiagDirection i;

		rfdd.owner = v->owner;
		rfdd.best_length = (uint)-1;

		/* search in all directions */
		for (i = 0; i != 4; i++) {
			FollowTrack(tile, 0x2000 | TRANSPORT_ROAD, i, EnumRoadSignalFindDepot, NULL, &rfdd);
		}

		if (rfdd.best_length == (uint)-1) return NULL;

		return GetDepotByTile(rfdd.tile);
	}
}

/** Send a road vehicle to the depot.
 * @param tile unused
 * @param p1 vehicle ID to send to the depot
 * @param p2 unused
 */
int32 CmdSendRoadVehToDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	Vehicle *v;
	const Depot *dep;

	if (!IsVehicleIndex(p1)) return CMD_ERROR;

	v = GetVehicle(p1);

	if (v->type != VEH_Road || !CheckOwnership(v->owner)) return CMD_ERROR;

	if (v->vehstatus & VS_CRASHED) return CMD_ERROR;

	/* If the current orders are already goto-depot */
	if (v->current_order.type == OT_GOTO_DEPOT) {
		if (flags & DC_EXEC) {
			/* If the orders to 'goto depot' are in the orders list (forced servicing),
			 * then skip to the next order; effectively cancelling this forced service */
			if (HASBIT(v->current_order.flags, OFB_PART_OF_ORDERS))
				v->cur_order_index++;

			v->current_order.type = OT_DUMMY;
			v->current_order.flags = 0;
			InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
		}
		return 0;
	}

	dep = FindClosestRoadDepot(v);
	if (dep == NULL) return_cmd_error(STR_9019_UNABLE_TO_FIND_LOCAL_DEPOT);

	if (flags & DC_EXEC) {
		ClearSlot(v);
		v->current_order.type = OT_GOTO_DEPOT;
		v->current_order.flags = OF_NON_STOP | OF_HALT_IN_DEPOT;
		v->current_order.station = dep->index;
		v->dest_tile = dep->xy;
		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
	}

	return 0;
}

/** Turn a roadvehicle around.
 * @param tile unused
 * @param p1 vehicle ID to turn
 * @param p2 unused
 */
int32 CmdTurnRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
	Vehicle *v;

	if (!IsVehicleIndex(p1)) return CMD_ERROR;

	v = GetVehicle(p1);

	if (v->type != VEH_Road || !CheckOwnership(v->owner)) return CMD_ERROR;

	if (v->vehstatus & (VS_HIDDEN | VS_STOPPED) ||
			v->u.road.crashed_ctr != 0 ||
			v->breakdown_ctr != 0 ||
			v->u.road.overtaking != 0 ||
			v->cur_speed < 5) {
		return CMD_ERROR;
	}

	if (flags & DC_EXEC) v->u.road.reverse_ctr = 180;

	return 0;
}


static void MarkRoadVehDirty(Vehicle *v)
{
	v->cur_image = GetRoadVehImage(v, v->direction);
	MarkAllViewportsDirty(v->left_coord, v->top_coord, v->right_coord + 1, v->bottom_coord + 1);
}

static void UpdateRoadVehDeltaXY(Vehicle *v)
{
#define MKIT(a,b,c,d) ((a&0xFF)<<24) | ((b&0xFF)<<16) | ((c&0xFF)<<8) | ((d&0xFF)<<0)
	static const uint32 _delta_xy_table[8] = {
		MKIT(3, 3, -1, -1),
		MKIT(3, 7, -1, -3),
		MKIT(3, 3, -1, -1),
		MKIT(7, 3, -3, -1),
		MKIT(3, 3, -1, -1),
		MKIT(3, 7, -1, -3),
		MKIT(3, 3, -1, -1),
		MKIT(7, 3, -3, -1),
	};
#undef MKIT
	uint32 x = _delta_xy_table[v->direction];
	v->x_offs        = GB(x,  0, 8);
	v->y_offs        = GB(x,  8, 8);
	v->sprite_width  = GB(x, 16, 8);
	v->sprite_height = GB(x, 24, 8);
}

static void ClearCrashedStation(Vehicle *v)
{
	RoadStop *rs = GetRoadStopByTile(v->tile, GetRoadStopType(v->tile));

	// mark station as not busy
	CLRBIT(rs->status, 7);

	// free parking bay
	SETBIT(rs->status, HASBIT(v->u.road.state, 1) ? 1 : 0);
}

static void RoadVehDelete(Vehicle *v)
{
	DeleteWindowById(WC_VEHICLE_VIEW, v->index);
	InvalidateWindow(WC_VEHICLE_DETAILS, v->index);

	RebuildVehicleLists();
	InvalidateWindow(WC_COMPANY, v->owner);

	if (IsTileType(v->tile, MP_STATION)) ClearCrashedStation(v);

	BeginVehicleMove(v);
	EndVehicleMove(v);

	ClearSlot(v);
	DeleteVehicle(v);
}

static byte SetRoadVehPosition(Vehicle *v, int x, int y)
{
	byte new_z, old_z;

	// need this hint so it returns the right z coordinate on bridges.
	_get_z_hint = v->z_pos;
	v->x_pos = x;
	v->y_pos = y;
	new_z = GetSlopeZ(x, y);
	_get_z_hint = 0;

	old_z = v->z_pos;
	v->z_pos = new_z;

	VehiclePositionChanged(v);
	EndVehicleMove(v);
	return old_z;
}

static void RoadVehSetRandomDirection(Vehicle *v)
{
	static const DirDiff delta[] = {
		DIRDIFF_45LEFT, DIRDIFF_SAME, DIRDIFF_SAME, DIRDIFF_45RIGHT
	};

	uint32 r = Random();

	v->direction = ChangeDir(v->direction, delta[r & 3]);
	BeginVehicleMove(v);
	UpdateRoadVehDeltaXY(v);
	v->cur_image = GetRoadVehImage(v, v->direction);
	SetRoadVehPosition(v, v->x_pos, v->y_pos);
}

static void RoadVehIsCrashed(Vehicle *v)
{
	v->u.road.crashed_ctr++;
	if (v->u.road.crashed_ctr == 2) {
		CreateEffectVehicleRel(v, 4, 4, 8, EV_EXPLOSION_LARGE);
	} else if (v->u.road.crashed_ctr <= 45) {
		if ((v->tick_counter & 7) == 0) RoadVehSetRandomDirection(v);
	} else if (v->u.road.crashed_ctr >= 2220) {
		RoadVehDelete(v);
	}
}

static void* EnumCheckRoadVehCrashTrain(Vehicle* v, void* data)
{
	const Vehicle* u = data;

	return
		v->type == VEH_Train &&
		myabs(v->z_pos - u->z_pos) <= 6 &&
		myabs(v->x_pos - u->x_pos) <= 4 &&
		myabs(v->y_pos - u->y_pos) <= 4 ?
			v : NULL;
}

static void RoadVehCrash(Vehicle *v)
{
	uint16 pass;

	v->u.road.crashed_ctr++;
	v->vehstatus |= VS_CRASHED;
	ClearSlot(v);

	InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);

	pass = 1;
	if (v->cargo_type == CT_PASSENGERS) pass += v->cargo_count;
	v->cargo_count = 0;

	SetDParam(0, pass);
	AddNewsItem(
		(pass == 1) ?
			STR_9031_ROAD_VEHICLE_CRASH_DRIVER : STR_9032_ROAD_VEHICLE_CRASH_DIE,
		NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ACCIDENT, 0),
		v->index,
		0
	);

	ModifyStationRatingAround(v->tile, v->owner, -160, 22);
	SndPlayVehicleFx(SND_12_EXPLOSION, v);
}

static void RoadVehCheckTrainCrash(Vehicle *v)
{
	TileIndex tile;

	if (v->u.road.state == 255) return;

	tile = v->tile;

	if (!IsLevelCrossingTile(tile)) return;

	if (VehicleFromPos(tile, v, EnumCheckRoadVehCrashTrain) != NULL)
		RoadVehCrash(v);
}

static void HandleBrokenRoadVeh(Vehicle *v)
{
	if (v->breakdown_ctr != 1) {
		v->breakdown_ctr = 1;
		v->cur_speed = 0;

		if (v->breakdowns_since_last_service != 255)
			v->breakdowns_since_last_service++;

		InvalidateWindow(WC_VEHICLE_VIEW, v->index);
		InvalidateWindow(WC_VEHICLE_DETAILS, v->index);

		SndPlayVehicleFx((_opt.landscape != LT_CANDY) ?
			SND_0F_VEHICLE_BREAKDOWN : SND_35_COMEDY_BREAKDOWN, v);

		if (!(v->vehstatus & VS_HIDDEN)) {
			Vehicle *u = CreateEffectVehicleRel(v, 4, 4, 5, EV_BREAKDOWN_SMOKE);
			if (u != NULL) u->u.special.unk0 = v->breakdown_delay * 2;
		}
	}

	if ((v->tick_counter & 1) == 0) {
		if (--v->breakdown_delay == 0) {
			v->breakdown_ctr = 0;
			InvalidateWindow(WC_VEHICLE_VIEW, v->index);
		}
	}
}

static void ProcessRoadVehOrder(Vehicle *v)
{
	const Order *order;

	switch (v->current_order.type) {
		case OT_GOTO_DEPOT:
			// Let a depot order in the orderlist interrupt.
			if (!(v->current_order.flags & OF_PART_OF_ORDERS)) return;
			if (v->current_order.flags & OF_SERVICE_IF_NEEDED &&
					!VehicleNeedsService(v)) {
				v->cur_order_index++;
			}
			break;

		case OT_LOADING:
		case OT_LEAVESTATION:
			return;
	}

	if (v->cur_order_index >= v->num_orders) v->cur_order_index = 0;

	order = GetVehicleOrder(v, v->cur_order_index);

	if (order == NULL) {
		v->current_order.type = OT_NOTHING;
		v->current_order.flags = 0;
		v->dest_tile = 0;
		ClearSlot(v);
		return;
	}

	if (order->type    == v->current_order.type &&
			order->flags   == v->current_order.flags &&
			order->station == v->current_order.station) {
		return;
	}

	v->current_order = *order;
	v->dest_tile = 0;

	if (order->type == OT_GOTO_STATION) {
		const Station* st = GetStation(order->station);
		const RoadStop* rs;
		TileIndex dest;
		uint mindist;

		if (order->station == v->last_station_visited) {
			v->last_station_visited = INVALID_STATION;
		}

		rs = GetPrimaryRoadStop(st, v->cargo_type == CT_PASSENGERS ? RS_BUS : RS_TRUCK);

		if (rs == NULL) {
			// There is no stop left at the station, so don't even TRY to go there
			v->cur_order_index++;
			InvalidateVehicleOrder(v);
			return;
		}

		dest = rs->xy;
		mindist = DistanceManhattan(v->tile, rs->xy);
		for (rs = rs->next; rs != NULL; rs = rs->next) {
			uint dist = DistanceManhattan(v->tile, rs->xy);

			if (dist < mindist) {
				mindist = dist;
				dest = rs->xy;
			}
		}
		v->dest_tile = dest;
	} else if (order->type == OT_GOTO_DEPOT) {
		v->dest_tile = GetDepot(order->station)->xy;
	}

	InvalidateVehicleOrder(v);
}

static void HandleRoadVehLoading(Vehicle *v)
{
	switch (v->current_order.type) {
		case OT_LOADING: {
			Order b;

			if (--v->load_unload_time_rem != 0) return;

			if (v->current_order.flags & OF_FULL_LOAD && CanFillVehicle(v)) {
				SET_EXPENSES_TYPE(EXPENSES_ROADVEH_INC);
				if (LoadUnloadVehicle(v)) {
					InvalidateWindow(WC_ROADVEH_LIST, v->owner);
					MarkRoadVehDirty(v);
				}
				return;
			}

			b = v->current_order;
			v->current_order.type = OT_LEAVESTATION;
			v->current_order.flags = 0;
			if (!(b.flags & OF_NON_STOP)) return;
			break;
		}

		case OT_DUMMY: break;

		default: return;
	}

	v->cur_order_index++;
	InvalidateVehicleOrder(v);
}

static void StartRoadVehSound(const Vehicle* v)
{
	SoundFx s = RoadVehInfo(v->engine_type)->sfx;
	if (s == SND_19_BUS_START_PULL_AWAY && (v->tick_counter & 3) == 0)
		s = SND_1A_BUS_START_PULL_AWAY_WITH_HORN;
	SndPlayVehicleFx(s, v);
}

typedef struct RoadVehFindData {
	int x;
	int y;
	const Vehicle* veh;
	Direction dir;
} RoadVehFindData;

static void* EnumCheckRoadVehClose(Vehicle *v, void* data)
{
	static const int8 dist_x[] = { -4, -8, -4, -1, 4, 8, 4, 1 };
	static const int8 dist_y[] = { -4, -1, 4, 8, 4, 1, -4, -8 };

	const RoadVehFindData* rvf = data;

	short x_diff = v->x_pos - rvf->x;
	short y_diff = v->y_pos - rvf->y;

	return
		rvf->veh != v &&
		v->type == VEH_Road &&
		v->u.road.state != 254 &&
		myabs(v->z_pos - rvf->veh->z_pos) < 6 &&
		v->direction == rvf->dir &&
		(dist_x[v->direction] >= 0 || (x_diff > dist_x[v->direction] && x_diff <= 0)) &&
		(dist_x[v->direction] <= 0 || (x_diff < dist_x[v->direction] && x_diff >= 0)) &&
		(dist_y[v->direction] >= 0 || (y_diff > dist_y[v->direction] && y_diff <= 0)) &&
		(dist_y[v->direction] <= 0 || (y_diff < dist_y[v->direction] && y_diff >= 0)) ?
			v : NULL;
}

static Vehicle* RoadVehFindCloseTo(Vehicle* v, int x, int y, Direction dir)
{
	RoadVehFindData rvf;
	Vehicle *u;

	if (v->u.road.reverse_ctr != 0) return NULL;

	rvf.x = x;
	rvf.y = y;
	rvf.dir = dir;
	rvf.veh = v;
	u = VehicleFromPos(TileVirtXY(x, y), &rvf, EnumCheckRoadVehClose);

	// This code protects a roadvehicle from being blocked for ever
	//  If more than 1480 / 74 days a road vehicle is blocked, it will
	//  drive just through it. The ultimate backup-code of TTD.
	// It can be disabled.
	if (u == NULL) {
		v->u.road.blocked_ctr = 0;
		return NULL;
	}

	if (++v->u.road.blocked_ctr > 1480) return NULL;

	return u;
}

static void RoadVehArrivesAt(const Vehicle* v, Station* st)
{
	if (v->cargo_type == CT_PASSENGERS) {
		/* Check if station was ever visited before */
		if (!(st->had_vehicle_of_type & HVOT_BUS)) {
			uint32 flags;

			st->had_vehicle_of_type |= HVOT_BUS;
			SetDParam(0, st->index);
			flags = (v->owner == _local_player) ? NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ARRIVAL_PLAYER, 0) : NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ARRIVAL_OTHER, 0);
			AddNewsItem(
				STR_902F_CITIZENS_CELEBRATE_FIRST,
				flags,
				v->index,
				0);
		}
	} else {
		/* Check if station was ever visited before */
		if (!(st->had_vehicle_of_type & HVOT_TRUCK)) {
			uint32 flags;

			st->had_vehicle_of_type |= HVOT_TRUCK;
			SetDParam(0, st->index);
			flags = (v->owner == _local_player) ? NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ARRIVAL_PLAYER, 0) : NEWS_FLAGS(NM_THIN, NF_VIEWPORT|NF_VEHICLE, NT_ARRIVAL_OTHER, 0);
			AddNewsItem(
				STR_9030_CITIZENS_CELEBRATE_FIRST,
				flags,
				v->index,
				0
			);
		}
	}
}

static bool RoadVehAccelerate(Vehicle *v)
{
	uint spd = v->cur_speed + 1 + (v->u.road.overtaking != 0 ? 1 : 0);
	byte t;

	// Clamp
	spd = min(spd, v->max_speed);

	//updates statusbar only if speed have changed to save CPU time
	if (spd != v->cur_speed) {
		v->cur_speed = spd;
		if (_patches.vehicle_speed) {
			InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
		}
	}

	// Decrease somewhat when turning
	if (!(v->direction & 1)) spd = spd * 3 >> 2;

	if (spd == 0) return false;

	if ((byte)++spd == 0) return true;

	v->progress = (t = v->progress) - (byte)spd;

	return (t < v->progress);
}

static Direction RoadVehGetNewDirection(const Vehicle* v, int x, int y)
{
	static const Direction _roadveh_new_dir[] = {
		DIR_N , DIR_NW, DIR_W , 0,
		DIR_NE, DIR_N , DIR_SW, 0,
		DIR_E , DIR_SE, DIR_S
	};

	x = x - v->x_pos + 1;
	y = y - v->y_pos + 1;

	if ((uint)x > 2 || (uint)y > 2) return v->direction;
	return _roadveh_new_dir[y * 4 + x];
}

static Direction RoadVehGetSlidingDirection(const Vehicle* v, int x, int y)
{
	Direction new = RoadVehGetNewDirection(v, x, y);
	Direction old = v->direction;
	DirDiff delta;

	if (new == old) return old;
	delta = (DirDifference(new, old) > DIRDIFF_REVERSE ? DIRDIFF_45LEFT : DIRDIFF_45RIGHT);
	return ChangeDir(old, delta);
}

typedef struct OvertakeData {
	const Vehicle* u;
	const Vehicle* v;
	TileIndex tile;
	byte tilebits;
} OvertakeData;

static void* EnumFindVehToOvertake(Vehicle* v, void* data)
{
	const OvertakeData* od = data;

	return
		v->tile == od->tile && v->type == VEH_Road && v == od->u && v == od->v ?
			v : NULL;
}

static bool FindRoadVehToOvertake(OvertakeData *od)
{
	uint32 bits;

	bits = GetTileTrackStatus(od->tile, TRANSPORT_ROAD) & 0x3F;

	if (!(od->tilebits & bits) || (bits & 0x3C) || (bits & 0x3F3F0000))
		return true;
	return VehicleFromPos(od->tile, od, EnumFindVehToOvertake) != NULL;
}

static void RoadVehCheckOvertake(Vehicle *v, Vehicle *u)
{
	OvertakeData od;
	byte tt;

	od.v = v;
	od.u = u;

	if (u->max_speed >= v->max_speed &&
			!(u->vehstatus & VS_STOPPED) &&
			u->cur_speed != 0) {
		return;
	}

	if (v->direction != u->direction || !(v->direction & 1)) return;

	if (v->u.road.state >= 32 || (v->u.road.state & 7) > 1) return;

	tt = GetTileTrackStatus(v->tile, TRANSPORT_ROAD) & 0x3F;
	if ((tt & 3) == 0) return;
	if ((tt & 0x3C) != 0) return;

	if (tt == 3) tt = (v->direction & 2) ? 2 : 1;
	od.tilebits = tt;

	od.tile = v->tile;
	if (FindRoadVehToOvertake(&od)) return;

	od.tile = v->tile + TileOffsByDir(DirToDiagDir(v->direction));
	if (FindRoadVehToOvertake(&od)) return;

	if (od.u->cur_speed == 0 || od.u->vehstatus& VS_STOPPED) {
		v->u.road.overtaking_ctr = 0x11;
		v->u.road.overtaking = 0x10;
	} else {
//		if (FindRoadVehToOvertake(&od)) return;
		v->u.road.overtaking_ctr = 0;
		v->u.road.overtaking = 0x10;
	}
}

static void RoadZPosAffectSpeed(Vehicle *v, byte old_z)
{
	if (old_z == v->z_pos) return;

	if (old_z < v->z_pos) {
		v->cur_speed = v->cur_speed * 232 / 256; // slow down by ~10%
	} else {
		uint16 spd = v->cur_speed + 2;
		if (spd <= v->max_speed) v->cur_speed = spd;
	}
}

static int PickRandomBit(uint bits)
{
	uint num = 0;
	uint b = bits;
	uint i;

	do {
		if (b & 1) num++;
	} while (b >>= 1);

	num = RandomRange(num);

	for (i = 0; !(bits & 1) || (int)--num >= 0; bits >>= 1, i++) {}
	return i;
}

typedef struct {
	TileIndex dest;
	uint maxtracklen;
	uint mindist;
} FindRoadToChooseData;

static bool EnumRoadTrackFindDist(TileIndex tile, void* data, int track, uint length, byte* state)
{
	FindRoadToChooseData* frd = data;
	uint dist = DistanceManhattan(tile, frd->dest);

	if (dist <= frd->mindist) {
		if (dist != frd->mindist || length < frd->maxtracklen) {
			frd->maxtracklen = length;
		}
		frd->mindist = dist;
	}
	return false;
}

// Returns direction to choose
// or -1 if the direction is currently blocked
static int RoadFindPathToDest(Vehicle* v, TileIndex tile, DiagDirection enterdir)
{
#define return_track(x) {best_track = x; goto found_best_track; }

	uint16 signal;
	uint bitmask;
	TileIndex desttile;
	FindRoadToChooseData frd;
	int best_track;
	uint best_dist, best_maxlen;
	uint i;

	{
		uint32 r = GetTileTrackStatus(tile, TRANSPORT_ROAD);
		signal  = GB(r, 16, 16);
		bitmask = GB(r,  0, 16);
	}

	if (IsTileType(tile, MP_STREET)) {
		if (GetRoadType(tile) == ROAD_DEPOT && IsTileOwner(tile, v->owner)) {
			/* Road depot */
			bitmask |= _road_veh_fp_ax_or[GetRoadDepotDirection(tile)];
		}
	} else if (IsTileType(tile, MP_STATION) && IsRoadStopTile(tile)) {
		if (IsTileOwner(tile, v->owner)) {
			/* Our station */
			RoadStopType rstype = (v->cargo_type == CT_PASSENGERS) ? RS_BUS : RS_TRUCK;

			if (GetRoadStopType(tile) == rstype) {
				const RoadStop *rs = GetRoadStopByTile(tile, rstype);

				if (rs != NULL && (_patches.roadveh_queue || GB(rs->status, 0, 2) != 0)) {
					bitmask |= _road_veh_fp_ax_or[GetRoadStopDir(tile)];
				}
			}
		}
	}
	/* The above lookups should be moved to GetTileTrackStatus in the
	 * future, but that requires more changes to the pathfinder and other
	 * stuff, probably even more arguments to GTTS.
	 */

	/* remove unreachable tracks */
	bitmask &= _road_veh_fp_ax_and[enterdir];
	if (bitmask == 0) {
		/* No reachable tracks, so we'll reverse */
		return_track(_road_reverse_table[enterdir]);
	}

	if (v->u.road.reverse_ctr != 0) {
		/* What happens here?? */
		v->u.road.reverse_ctr = 0;
		if (v->tile != tile) {
			return_track(_road_reverse_table[enterdir]);
		}
	}

	desttile = v->dest_tile;
	if (desttile == 0) {
		// Pick a random track
		return_track(PickRandomBit(bitmask));
	}

	// Only one track to choose between?
	if (!(KillFirstBit2x64(bitmask))) {
		return_track(FindFirstBit2x64(bitmask));
	}

	if (_patches.new_pathfinding_all) {
		NPFFindStationOrTileData fstd;
		NPFFoundTargetData ftd;
		byte trackdir;

		NPFFillWithOrderData(&fstd, v);
		trackdir = DiagdirToDiagTrackdir(enterdir);
		//debug("Finding path. Enterdir: %d, Trackdir: %d", enterdir, trackdir);

		ftd = NPFRouteToStationOrTile(tile - TileOffsByDir(enterdir), trackdir, &fstd, TRANSPORT_ROAD, v->owner, INVALID_RAILTYPE);
		if (ftd.best_trackdir == 0xff) {
			/* We are already at our target. Just do something */
			//TODO: maybe display error?
			//TODO: go straight ahead if possible?
			return_track(FindFirstBit2x64(bitmask));
		} else {
			/* If ftd.best_bird_dist is 0, we found our target and ftd.best_trackdir contains
			the direction we need to take to get there, if ftd.best_bird_dist is not 0,
			we did not find our target, but ftd.best_trackdir contains the direction leading
			to the tile closest to our target. */
			return_track(ftd.best_trackdir);
		}
	} else {
		DiagDirection dir;

		if (IsTileType(desttile, MP_STREET)) {
			if (GetRoadType(desttile) == ROAD_DEPOT) {
				dir = GetRoadDepotDirection(desttile);
				goto do_it;
			}
		} else if (IsTileType(desttile, MP_STATION)) {
			if (IsRoadStop(desttile)) {
				dir = GetRoadStopDir(desttile);
do_it:;
				/* When we are heading for a depot or station, we just
				 * pretend we are heading for the tile in front, we'll
				 * see from there */
				desttile += TileOffsByDir(dir);
				if (desttile == tile && bitmask & _road_pf_table_3[dir]) {
					/* If we are already in front of the
					 * station/depot and we can get in from here,
					 * we enter */
					return_track(FindFirstBit2x64(bitmask & _road_pf_table_3[dir]));
				}
			}
		}
		// do pathfind
		frd.dest = desttile;

		best_track = -1;
		best_dist = (uint)-1;
		best_maxlen = (uint)-1;
		i = 0;
		do {
			if (bitmask & 1) {
				if (best_track == -1) best_track = i; // in case we don't find the path, just pick a track
				frd.maxtracklen = (uint)-1;
				frd.mindist = (uint)-1;
				FollowTrack(tile, 0x2000 | TRANSPORT_ROAD, _road_pf_directions[i], EnumRoadTrackFindDist, NULL, &frd);

				if (frd.mindist < best_dist || (frd.mindist==best_dist && frd.maxtracklen < best_maxlen)) {
					best_dist = frd.mindist;
					best_maxlen = frd.maxtracklen;
					best_track = i;
				}
			}
		} while (++i,(bitmask>>=1) != 0);
	}

found_best_track:;

	if (HASBIT(signal, best_track)) return -1;

	return best_track;
}

static uint RoadFindPathToStop(const Vehicle *v, TileIndex tile)
{
	NPFFindStationOrTileData fstd;
	byte trackdir = GetVehicleTrackdir(v);
	assert(trackdir != 0xFF);

	fstd.dest_coords = tile;
	fstd.station_index = INVALID_STATION; // indicates that the destination is a tile, not a station

	return NPFRouteToStationOrTile(v->tile, trackdir, &fstd, TRANSPORT_ROAD, v->owner, INVALID_RAILTYPE).best_path_dist;
}

typedef struct RoadDriveEntry {
	byte x,y;
} RoadDriveEntry;

#include "table/roadveh.h"

static const byte _road_veh_data_1[] = {
	20, 20, 16, 16, 0, 0, 0, 0,
	19, 19, 15, 15, 0, 0, 0, 0,
	16, 16, 12, 12, 0, 0, 0, 0,
	15, 15, 11, 11
};

static const byte _roadveh_data_2[4] = { 0,1,8,9 };

static void RoadVehController(Vehicle *v)
{
	Direction new_dir;
	Direction old_dir;
	RoadDriveEntry rd;
	int x,y;
	uint32 r;

	// decrease counters
	v->tick_counter++;
	if (v->u.road.reverse_ctr != 0) v->u.road.reverse_ctr--;

	// handle crashed
	if (v->u.road.crashed_ctr != 0) {
		RoadVehIsCrashed(v);
		return;
	}

	RoadVehCheckTrainCrash(v);

	// road vehicle has broken down?
	if (v->breakdown_ctr != 0) {
		if (v->breakdown_ctr <= 2) {
			HandleBrokenRoadVeh(v);
			return;
		}
		v->breakdown_ctr--;
	}

	if (v->vehstatus & VS_STOPPED) return;

	ProcessRoadVehOrder(v);
	HandleRoadVehLoading(v);

	if (v->current_order.type == OT_LOADING) return;

	if (v->u.road.state == 254) {
		DiagDirection dir;
		const RoadDriveEntry* rdp;
		byte rd2;

		v->cur_speed = 0;

		dir = GetRoadDepotDirection(v->tile);
		v->direction = DiagDirToDir(dir);

		rd2 = _roadveh_data_2[dir];
		rdp = _road_drive_data[(_opt.road_side << 4) + rd2];

		x = TileX(v->tile) * TILE_SIZE + (rdp[6].x & 0xF);
		y = TileY(v->tile) * TILE_SIZE + (rdp[6].y & 0xF);

		if (RoadVehFindCloseTo(v, x, y, v->direction) != NULL) return;

		VehicleServiceInDepot(v);

		StartRoadVehSound(v);

		BeginVehicleMove(v);

		v->vehstatus &= ~VS_HIDDEN;
		v->u.road.state = rd2;
		v->u.road.frame = 6;

		v->cur_image = GetRoadVehImage(v, v->direction);
		UpdateRoadVehDeltaXY(v);
		SetRoadVehPosition(v,x,y);

		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
		return;
	}

	if (!RoadVehAccelerate(v)) return;

	if (v->u.road.overtaking != 0)  {
		if (++v->u.road.overtaking_ctr >= 35)
			/* If overtaking just aborts at a random moment, we can have a out-of-bound problem,
			 *  if the vehicle started a corner. To protect that, only allow an abort of
			 *  overtake if we are on straight road, which are the 8 states below */
			if (v->u.road.state == 0  || v->u.road.state == 1  ||
					v->u.road.state == 8  || v->u.road.state == 9  ||
					v->u.road.state == 16 || v->u.road.state == 17 ||
					v->u.road.state == 24 || v->u.road.state == 25) {
				v->u.road.overtaking = 0;
			}
	}

	BeginVehicleMove(v);

	if (v->u.road.state == 255) {
		GetNewVehiclePosResult gp;

		GetNewVehiclePos(v, &gp);

		if (RoadVehFindCloseTo(v, gp.x, gp.y, v->direction) != NULL) {
			v->cur_speed = 0;
			return;
		}

		if (IsTunnelTile(gp.new_tile) &&
				VehicleEnterTile(v, gp.new_tile, gp.x, gp.y) & 4) {
			//new_dir = RoadGetNewDirection(v, gp.x, gp.y)
			v->cur_image = GetRoadVehImage(v, v->direction);
			UpdateRoadVehDeltaXY(v);
			SetRoadVehPosition(v,gp.x,gp.y);
			return;
		}

		v->x_pos = gp.x;
		v->y_pos = gp.y;
		VehiclePositionChanged(v);
		return;
	}

	rd = _road_drive_data[(v->u.road.state + (_opt.road_side << 4)) ^ v->u.road.overtaking][v->u.road.frame + 1];

// switch to another tile
	if (rd.x & 0x80) {
		TileIndex tile = v->tile + TileOffsByDir(rd.x & 3);
		int dir = RoadFindPathToDest(v, tile, rd.x & 3);
		uint32 r;
		Direction newdir;
		const RoadDriveEntry *rdp;

		if (dir == -1) {
			v->cur_speed = 0;
			return;
		}

again:
		if ((dir & 7) >= 6) {
			/* Turning around */
			tile = v->tile;
		}

		rdp = _road_drive_data[(dir + (_opt.road_side << 4)) ^ v->u.road.overtaking];

		x = TileX(tile) * TILE_SIZE + rdp[0].x;
		y = TileY(tile) * TILE_SIZE + rdp[0].y;

		newdir = RoadVehGetSlidingDirection(v, x, y);
		if (RoadVehFindCloseTo(v, x, y, newdir) != NULL) return;

		r = VehicleEnterTile(v, tile, x, y);
		if (r & 8) {
			if (!IsTileType(tile, MP_TUNNELBRIDGE)) {
				v->cur_speed = 0;
				return;
			}
			dir = _road_reverse_table[rd.x&3];
			goto again;
		}

		if (IS_BYTE_INSIDE(v->u.road.state, 0x20, 0x30) && IsTileType(v->tile, MP_STATION)) {
			if ((dir & 7) >= 6) {
				v->cur_speed = 0;
				return;
			}
			if (IsRoadStop(v->tile)) {
				RoadStop *rs = GetRoadStopByTile(v->tile, GetRoadStopType(v->tile));

				// reached a loading bay, mark it as used and clear the usage bit
				SETBIT(rs->status, v->u.road.state & 2 ? 1 : 0); // occupied bay
				CLRBIT(rs->status, 7); // usage bit
			}
		}

		if (!(r & 4)) {
			v->tile = tile;
			v->u.road.state = (byte)dir;
			v->u.road.frame = 0;
		}
		if (newdir != v->direction) {
			v->direction = newdir;
			v->cur_speed -= v->cur_speed >> 2;
		}

		v->cur_image = GetRoadVehImage(v, newdir);
		UpdateRoadVehDeltaXY(v);
		RoadZPosAffectSpeed(v, SetRoadVehPosition(v, x, y));
		return;
	}

	if (rd.x & 0x40) {
		int dir = RoadFindPathToDest(v, v->tile,	rd.x & 3);
		uint32 r;
		int tmp;
		Direction newdir;
		const RoadDriveEntry *rdp;

		if (dir == -1) {
			v->cur_speed = 0;
			return;
		}

		tmp = (_opt.road_side << 4) + dir;
		rdp = _road_drive_data[tmp];

		x = TileX(v->tile) * TILE_SIZE + rdp[1].x;
		y = TileY(v->tile) * TILE_SIZE + rdp[1].y;

		newdir = RoadVehGetSlidingDirection(v, x, y);
		if (RoadVehFindCloseTo(v, x, y, newdir) != NULL) return;

		r = VehicleEnterTile(v, v->tile, x, y);
		if (r & 8) {
			v->cur_speed = 0;
			return;
		}

		v->u.road.state = tmp & ~16;
		v->u.road.frame = 1;

		if (newdir != v->direction) {
			v->direction = newdir;
			v->cur_speed -= v->cur_speed >> 2;
		}

		v->cur_image = GetRoadVehImage(v, newdir);
		UpdateRoadVehDeltaXY(v);
		RoadZPosAffectSpeed(v, SetRoadVehPosition(v, x, y));
		return;
	}

	x = (v->x_pos & ~15) + (rd.x & 15);
	y = (v->y_pos & ~15) + (rd.y & 15);

	new_dir = RoadVehGetSlidingDirection(v, x, y);

	if (!IS_BYTE_INSIDE(v->u.road.state, 0x20, 0x30)) {
		Vehicle* u = RoadVehFindCloseTo(v, x, y, new_dir);

		if (u != NULL) {
			if (v->u.road.overtaking == 0) RoadVehCheckOvertake(v, u);
			return;
		}
	}

	old_dir = v->direction;
	if (new_dir != old_dir) {
		v->direction = new_dir;
		v->cur_speed -= (v->cur_speed >> 2);
		if (old_dir != v->u.road.state) {
			v->cur_image = GetRoadVehImage(v, new_dir);
			UpdateRoadVehDeltaXY(v);
			SetRoadVehPosition(v, v->x_pos, v->y_pos);
			return;
		}
	}

	if (v->u.road.state >= 0x20 &&
			_road_veh_data_1[v->u.road.state - 0x20 + (_opt.road_side<<4)] == v->u.road.frame) {
		RoadStop *rs = GetRoadStopByTile(v->tile, GetRoadStopType(v->tile));
		Station* st = GetStationByTile(v->tile);

		if (v->current_order.type != OT_LEAVESTATION &&
				v->current_order.type != OT_GOTO_DEPOT) {
			Order old_order;

			CLRBIT(rs->status, 7);

			v->last_station_visited = GetStationIndex(v->tile);

			RoadVehArrivesAt(v, st);

			old_order = v->current_order;
			v->current_order.type = OT_LOADING;
			v->current_order.flags = 0;

			if (old_order.type == OT_GOTO_STATION &&
					v->current_order.station == v->last_station_visited) {
				v->current_order.flags =
					(old_order.flags & (OF_FULL_LOAD | OF_UNLOAD | OF_TRANSFER)) | OF_NON_STOP;
			}

			SET_EXPENSES_TYPE(EXPENSES_ROADVEH_INC);
			if (LoadUnloadVehicle(v)) {
				InvalidateWindow(WC_ROADVEH_LIST, v->owner);
				MarkRoadVehDirty(v);
			}
			InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
			return;
		}

		if (v->current_order.type != OT_GOTO_DEPOT) {
			if (HASBIT(rs->status, 7)) {
				v->cur_speed = 0;
				return;
			}
			v->current_order.type = OT_NOTHING;
			v->current_order.flags = 0;
			ClearSlot(v);
		}
		SETBIT(rs->status, 7);

		if (rs == v->u.road.slot) {
			//we have arrived at the correct station
			ClearSlot(v);
		} else if (v->u.road.slot != NULL) {
			//we have arrived at the wrong station
			//XXX The question is .. what to do? Actually we shouldn't be here
			//but I guess we need to clear the slot
			DEBUG(ms, 0) ("Multistop: Vehicle %d (index %d) arrived at wrong stop.", v->unitnumber, v->index);
			if (v->tile != v->dest_tile) {
				DEBUG(ms, 0) ("Multistop: -- Current tile 0x%X is not destination tile 0x%X. Route problem", v->tile, v->dest_tile);
			}
			if (v->dest_tile != v->u.road.slot->xy) {
				DEBUG(ms, 0) ("Multistop: -- Stop tile 0x%X is not destination tile 0x%X. Multistop desync", v->u.road.slot->xy, v->dest_tile);
			}
			if (v->current_order.type != OT_GOTO_STATION) {
				DEBUG(ms, 0) ("Multistop: -- Current order type (%d) is not OT_GOTO_STATION.", v->current_order.type);
			} else {
				if (v->current_order.station != st->index)
					DEBUG(ms, 0) ("Multistop: -- Current station %d is not target station in current_order.station (%d).",
							st->index, v->current_order.station);
			}

			DEBUG(ms, 0) ("           -- Force a slot clearing.");
			ClearSlot(v);
		}

		StartRoadVehSound(v);
		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
	}

	r = VehicleEnterTile(v, v->tile, x, y);
	if (r & 8) {
		v->cur_speed = 0;
		return;
	}

	if ((r & 4) == 0) v->u.road.frame++;

	v->cur_image = GetRoadVehImage(v, v->direction);
	UpdateRoadVehDeltaXY(v);
	RoadZPosAffectSpeed(v, SetRoadVehPosition(v, x, y));
}

void RoadVehEnterDepot(Vehicle *v)
{
	v->u.road.state = 254;
	v->vehstatus |= VS_HIDDEN;

	InvalidateWindow(WC_VEHICLE_DETAILS, v->index);

	VehicleServiceInDepot(v);

	TriggerVehicle(v, VEHICLE_TRIGGER_DEPOT);

	if (v->current_order.type == OT_GOTO_DEPOT) {
		Order t;

		InvalidateWindow(WC_VEHICLE_VIEW, v->index);

		t = v->current_order;
		v->current_order.type = OT_DUMMY;
		v->current_order.flags = 0;

		// Part of the orderlist?
		if (HASBIT(t.flags, OFB_PART_OF_ORDERS)) {
			v->cur_order_index++;
		} else if (HASBIT(t.flags, OFB_HALT_IN_DEPOT)) {
			v->vehstatus |= VS_STOPPED;
			if (v->owner == _local_player) {
				SetDParam(0, v->unitnumber);
				AddNewsItem(
					STR_9016_ROAD_VEHICLE_IS_WAITING,
					NEWS_FLAGS(NM_SMALL, NF_VIEWPORT|NF_VEHICLE, NT_ADVICE, 0),
					v->index,
					0
				);
			}
		}
	}

	InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);
	InvalidateWindowClasses(WC_ROADVEH_LIST);
}

static void AgeRoadVehCargo(Vehicle *v)
{
	if (_age_cargo_skip_counter != 0) return;
	if (v->cargo_days != 255) v->cargo_days++;
}

void RoadVeh_Tick(Vehicle *v)
{
	AgeRoadVehCargo(v);
	RoadVehController(v);
}

static void CheckIfRoadVehNeedsService(Vehicle *v)
{
	const Depot* depot;

	if (_patches.servint_roadveh == 0) return;
	if (!VehicleNeedsService(v)) return;
	if (v->vehstatus & VS_STOPPED) return;
	if (_patches.gotodepot && VehicleHasDepotOrders(v)) return;

	// Don't interfere with a depot visit scheduled by the user, or a
	// depot visit by the order list.
	if (v->current_order.type == OT_GOTO_DEPOT &&
			(v->current_order.flags & (OF_HALT_IN_DEPOT | OF_PART_OF_ORDERS)) != 0)
		return;

	// If we already got a slot at a stop, use that FIRST, and go to a depot later
	if (v->u.road.slot != NULL) return;

	// XXX If we already have a depot order, WHY do we search over and over?
	depot = FindClosestRoadDepot(v);

	if (depot == NULL || DistanceManhattan(v->tile, depot->xy) > 12) {
		if (v->current_order.type == OT_GOTO_DEPOT) {
			v->current_order.type = OT_DUMMY;
			v->current_order.flags = 0;
			InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
		}
		return;
	}

	if (v->current_order.type == OT_GOTO_DEPOT &&
			v->current_order.flags & OF_NON_STOP &&
			!CHANCE16(1, 20)) {
		return;
	}

	v->current_order.type = OT_GOTO_DEPOT;
	v->current_order.flags = OF_NON_STOP;
	v->current_order.station = depot->index;
	v->dest_tile = depot->xy;
	InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);
}

void OnNewDay_RoadVeh(Vehicle *v)
{
	int32 cost;
	Station *st;

	if ((++v->day_counter & 7) == 0) DecreaseVehicleValue(v);
	if (v->u.road.blocked_ctr == 0) CheckVehicleBreakdown(v);

	AgeVehicle(v);
	CheckIfRoadVehNeedsService(v);

	CheckOrders(v);

	//Current slot has expired
	if (v->current_order.type == OT_GOTO_STATION && v->u.road.slot != NULL && v->u.road.slot_age-- == 0) {
		DEBUG(ms, 2) ("Multistop: Slot expired for vehicle %d (index %d) at stop 0x%X",
			v->unitnumber, v->index, v->u.road.slot->xy);
		ClearSlot(v);
	}

	if (v->vehstatus & VS_STOPPED) return;

	/* update destination */
	if (v->current_order.type == OT_GOTO_STATION && v->u.road.slot == NULL && !(v->vehstatus & VS_CRASHED)) {
		RoadStop *rs;
		RoadStop *best = NULL;

		st = GetStation(v->current_order.station);
		rs = GetPrimaryRoadStop(st, v->cargo_type == CT_PASSENGERS ? RS_BUS : RS_TRUCK);

		if (rs != NULL) {
			if (DistanceManhattan(v->tile, st->xy) < 16) {
				uint dist, badness;
				uint minbadness = UINT_MAX;

				DEBUG(ms, 2) ("Multistop: Attempting to obtain a slot for vehicle %d (index %d) at station %d (0x%X)", v->unitnumber,
						v->index, st->index, st->xy);
				/* Now we find the nearest road stop that has a free slot */
				for (; rs != NULL; rs = rs->next) {
					dist = RoadFindPathToStop(v, rs->xy);
					if (dist == UINT_MAX) {
						DEBUG(ms, 4) (" ---- stop 0x%X is not reachable, not treating further", rs->xy);
						continue;
					}
					badness = (rs->num_vehicles + 1) * (rs->num_vehicles + 1) + dist / NPF_TILE_LENGTH;

					DEBUG(ms, 4) (" ---- stop 0x%X has %d vehicle%s waiting", rs->xy, rs->num_vehicles, rs->num_vehicles == 1 ? "":"s");
					DEBUG(ms, 4) (" ---- Distance is %u", dist);
					DEBUG(ms, 4) (" -- Badness %u", badness);

					if (badness < minbadness) {
						best = rs;
						minbadness = badness;
					}
				}

				if (best != NULL) {
					best->num_vehicles++;
					DEBUG(ms, 3) (" -- Assigned to stop 0x%X", best->xy);

					v->u.road.slot = best;
					v->dest_tile = best->xy;
					v->u.road.slot_age = 14;
				} else {
					DEBUG(ms, 3) (" -- Could not find a suitable stop");
				}
			} else {
				DEBUG(ms, 5) ("Multistop: --- Distance from station too far. Postponing slotting for vehicle %d (index %d) at station %d, (0x%X)",
						v->unitnumber, v->index, st->index, st->xy);
			}
		} else {
			DEBUG(ms, 4) ("Multistop: No road stop for vehicle %d (index %d) at station %d (0x%X)",
					v->unitnumber, v->index, st->index, st->xy);
		}
	}

	cost = RoadVehInfo(v->engine_type)->running_cost * _price.roadveh_running / 364;

	v->profit_this_year -= cost >> 8;

	SET_EXPENSES_TYPE(EXPENSES_ROADVEH_RUN);
	SubtractMoneyFromPlayerFract(v->owner, cost);

	InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
	InvalidateWindowClasses(WC_ROADVEH_LIST);
}


void RoadVehiclesYearlyLoop(void)
{
	Vehicle *v;

	FOR_ALL_VEHICLES(v) {
		if (v->type == VEH_Road) {
			v->profit_last_year = v->profit_this_year;
			v->profit_this_year = 0;
			InvalidateWindow(WC_VEHICLE_DETAILS, v->index);
		}
	}
}