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/* $Id$ */

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/** @file vehicle.cpp */

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#include "stdafx.h"

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#include "openttd.h"

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#include "road_map.h"

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#include "roadveh.h"

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#include "ship.h"

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#include "spritecache.h"

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#include "table/sprites.h"

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#include "table/strings.h"

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#include "functions.h"

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#include "landscape.h"

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#include "map.h"

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#include "tile.h"

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#include "vehicle.h"

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#include "gfx.h"

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#include "viewport.h"

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#include "news.h"

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#include "command.h"

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#include "saveload.h"

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#include "player.h"

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#include "engine.h"

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#include "sound.h"

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#include "debug.h"

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#include "vehicle_gui.h"

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#include "depot.h"

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#include "station.h"

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#include "rail.h"

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#include "train.h"

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#include "aircraft.h"

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#include "industry_map.h"

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#include "station_map.h"

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#include "water_map.h"

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#include "network/network.h"

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#include "yapf/yapf.h"

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#include "date.h"

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#include "newgrf_callbacks.h"

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#include "newgrf_engine.h"

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#include "newgrf_sound.h"

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#include "helpers.hpp"

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#include "group.h"

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#include "economy.h"

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#define INVALID_COORD (-0x8000)

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#define GEN_HASH(x, y) ((GB((y), 6, 6) << 6) + GB((x), 7, 6))

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/* Tables used in vehicle.h to find the right command for a certain vehicle type */

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const uint32 _veh_build_proc_table[] = {

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	CMD_BUILD_RAIL_VEHICLE,

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	CMD_BUILD_ROAD_VEH,

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	CMD_BUILD_SHIP,

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	CMD_BUILD_AIRCRAFT,

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};

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const uint32 _veh_sell_proc_table[] = {

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	CMD_SELL_RAIL_WAGON,

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	CMD_SELL_ROAD_VEH,

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	CMD_SELL_SHIP,

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	CMD_SELL_AIRCRAFT,

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};

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const uint32 _veh_refit_proc_table[] = {

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	CMD_REFIT_RAIL_VEHICLE,

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	CMD_REFIT_ROAD_VEH,

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	CMD_REFIT_SHIP,

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	CMD_REFIT_AIRCRAFT,

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};

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const uint32 _send_to_depot_proc_table[] = {

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	CMD_SEND_TRAIN_TO_DEPOT,

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	CMD_SEND_ROADVEH_TO_DEPOT,

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	CMD_SEND_SHIP_TO_DEPOT,

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	CMD_SEND_AIRCRAFT_TO_HANGAR,

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};

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enum {

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	BLOCKS_FOR_SPECIAL_VEHICLES   = 2, ///< Blocks needed for special vehicles

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};

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/**

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 * Called if a new block is added to the vehicle-pool

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 */

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static void VehiclePoolNewBlock(uint start_item)

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{

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	Vehicle *v;

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	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.

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	 * TODO - This is just a temporary stage, this will be removed. */

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	for (v = GetVehicle(start_item); v != NULL; v = (v->index + 1U < GetVehiclePoolSize()) ? GetVehicle(v->index + 1) : NULL) {

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		v->index = start_item++;

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		v = new (v) InvalidVehicle();

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	}

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}

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/* Initialize the vehicle-pool */

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DEFINE_OLD_POOL(Vehicle, Vehicle, VehiclePoolNewBlock, NULL)

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void VehicleServiceInDepot(Vehicle *v)

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{

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	v->date_of_last_service = _date;

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	v->breakdowns_since_last_service = 0;

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	v->reliability = GetEngine(v->engine_type)->reliability;

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	InvalidateWindow(WC_VEHICLE_DETAILS, v->index); // ensure that last service date and reliability are updated

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}

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bool VehicleNeedsService(const Vehicle *v)

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{

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	if (v->vehstatus & VS_CRASHED)

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		return false; // Crashed vehicles don't need service anymore

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	if (_patches.no_servicing_if_no_breakdowns && _opt.diff.vehicle_breakdowns == 0) {

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		return EngineHasReplacementForPlayer(GetPlayer(v->owner), v->engine_type, v->group_id);  /* Vehicles set for autoreplacing needs to go to a depot even if breakdowns are turned off */

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	}

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	return _patches.servint_ispercent ?

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		(v->reliability < GetEngine(v->engine_type)->reliability * (100 - v->service_interval) / 100) :

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		(v->date_of_last_service + v->service_interval < _date);

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}

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StringID VehicleInTheWayErrMsg(const Vehicle* v)

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{

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	switch (v->type) {

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		case VEH_TRAIN:    return STR_8803_TRAIN_IN_THE_WAY;

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		case VEH_ROAD:     return STR_9000_ROAD_VEHICLE_IN_THE_WAY;

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		case VEH_AIRCRAFT: return STR_A015_AIRCRAFT_IN_THE_WAY;

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		default:           return STR_980E_SHIP_IN_THE_WAY;

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	}

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}

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static void *EnsureNoVehicleProc(Vehicle *v, void *data)

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{

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	if (v->tile != *(const TileIndex*)data || v->type == VEH_DISASTER)

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		return NULL;

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	_error_message = VehicleInTheWayErrMsg(v);

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	return v;

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}

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bool EnsureNoVehicle(TileIndex tile)

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{

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	return VehicleFromPos(tile, &tile, EnsureNoVehicleProc) == NULL;

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}

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static void *EnsureNoVehicleProcZ(Vehicle *v, void *data)

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{

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	const TileInfo *ti = (const TileInfo*)data;

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	if (v->tile != ti->tile || v->type == VEH_DISASTER) return NULL;

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	if (v->z_pos > ti->z) return NULL;

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	_error_message = VehicleInTheWayErrMsg(v);

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	return v;

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}

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bool EnsureNoVehicleOnGround(TileIndex tile)

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{

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	TileInfo ti;

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	ti.tile = tile;

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	ti.z = GetTileMaxZ(tile);

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	return VehicleFromPos(tile, &ti, EnsureNoVehicleProcZ) == NULL;

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}

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Vehicle *FindVehicleOnTileZ(TileIndex tile, byte z)

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{

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	TileInfo ti;

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	ti.tile = tile;

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	ti.z = z;

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	return (Vehicle*)VehicleFromPos(tile, &ti, EnsureNoVehicleProcZ);

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}

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Vehicle *FindVehicleBetween(TileIndex from, TileIndex to, byte z, bool without_crashed)

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{

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	int x1 = TileX(from);

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	int y1 = TileY(from);

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	int x2 = TileX(to);

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	int y2 = TileY(to);

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	Vehicle *veh;

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	/* Make sure x1 < x2 or y1 < y2 */

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	if (x1 > x2 || y1 > y2) {

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		Swap(x1, x2);

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		Swap(y1, y2);

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	}

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	FOR_ALL_VEHICLES(veh) {

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		if (without_crashed && (veh->vehstatus & VS_CRASHED) != 0) continue;

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		if ((veh->type == VEH_TRAIN || veh->type == VEH_ROAD) && (z == 0xFF || veh->z_pos == z)) {

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			if ((veh->x_pos >> 4) >= x1 && (veh->x_pos >> 4) <= x2 &&

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					(veh->y_pos >> 4) >= y1 && (veh->y_pos >> 4) <= y2) {

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				return veh;

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			}

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		}

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	}

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	return NULL;

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}

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static void UpdateVehiclePosHash(Vehicle* v, int x, int y);

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void VehiclePositionChanged(Vehicle *v)

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{

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	int img = v->cur_image;

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	Point pt = RemapCoords(v->x_pos + v->x_offs, v->y_pos + v->y_offs, v->z_pos);

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	const Sprite* spr = GetSprite(img);

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	pt.x += spr->x_offs;

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	pt.y += spr->y_offs;

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	UpdateVehiclePosHash(v, pt.x, pt.y);

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	v->left_coord = pt.x;

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	v->top_coord = pt.y;

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	v->right_coord = pt.x + spr->width + 2;

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	v->bottom_coord = pt.y + spr->height + 2;

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}

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/** Called after load to update coordinates */

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void AfterLoadVehicles()

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{

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	Vehicle *v;

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	FOR_ALL_VEHICLES(v) {

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		v->UpdateDeltaXY(v->direction);

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		v->first = NULL;

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		if (v->type == VEH_TRAIN) v->u.rail.first_engine = INVALID_ENGINE;

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	}

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	FOR_ALL_VEHICLES(v) {

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			TrainConsistChanged(v);

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	}

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	FOR_ALL_VEHICLES(v) {

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		switch (v->type) {

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			case VEH_ROAD:

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				v->cur_image = GetRoadVehImage(v, v->direction);

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				v->u.road.roadtype = HASBIT(EngInfo(v->engine_type)->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD;

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				v->u.road.compatible_roadtypes = RoadTypeToRoadTypes(v->u.road.roadtype);

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				break;

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			case VEH_TRAIN: v->cur_image = GetTrainImage(v, v->direction); break;

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			case VEH_SHIP: v->cur_image = GetShipImage(v, v->direction); break;

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			case VEH_AIRCRAFT:

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				if (IsNormalAircraft(v)) {

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					v->cur_image = GetAircraftImage(v, v->direction);

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					/* The plane's shadow will have the same image as the plane */

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					Vehicle *shadow = v->next;

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					shadow->cur_image = v->cur_image;

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					/* In the case of a helicopter we will update the rotor sprites */

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					if (v->subtype == AIR_HELICOPTER) {

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						Vehicle *rotor = shadow->next;

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						rotor->cur_image = GetRotorImage(v);

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					}

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					UpdateAircraftCache(v);

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				}

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				break;

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			default: break;

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		}

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		v->left_coord = INVALID_COORD;

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		VehiclePositionChanged(v);

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	}

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}

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static Vehicle *InitializeVehicle(Vehicle *v)

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{

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	VehicleID index = v->index;

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	memset(v, 0, sizeof(Vehicle));

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	v->index = index;

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	assert(v->orders == NULL);

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	v = new (v) InvalidVehicle();

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	v->left_coord = INVALID_COORD;

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	v->first = NULL;

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	v->next = NULL;

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	v->next_hash = NULL;

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	v->string_id = 0;

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	v->next_shared = NULL;

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	v->prev_shared = NULL;

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	v->depot_list  = NULL;

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	v->random_bits = 0;

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	v->group_id = DEFAULT_GROUP;

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	return v;

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}

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/**

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 * Get a value for a vehicle's random_bits.

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 * @return A random value from 0 to 255.

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 */

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byte VehicleRandomBits()

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{

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	return GB(Random(), 0, 8);

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}

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Vehicle *ForceAllocateSpecialVehicle()

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{

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	/* This stays a strange story.. there should always be room for special

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	 * vehicles (special effects all over the map), but with 65k of vehicles

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	 * is this realistic to double-check for that? For now we just reserve

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	 * BLOCKS_FOR_SPECIAL_VEHICLES times block_size vehicles that may only

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	 * be used for special vehicles.. should work nicely :) */

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	Vehicle *v;

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	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.

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	 * TODO - This is just a temporary stage, this will be removed. */

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	for (v = GetVehicle(0); v != NULL; v = (v->index + 1U < GetVehiclePoolSize()) ? GetVehicle(v->index + 1) : NULL) {

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		/* No more room for the special vehicles, return NULL */

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		if (v->index >= (1 << Vehicle_POOL_BLOCK_SIZE_BITS) * BLOCKS_FOR_SPECIAL_VEHICLES)

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			return NULL;

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		if (!IsValidVehicle(v)) return InitializeVehicle(v);

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	}

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	return NULL;

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}

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/**

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 * finds a free vehicle in the memory or allocates a new one

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 * returns a pointer to the first free vehicle or NULL if all vehicles are in use

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 * *skip_vehicles is an offset to where in the array we should begin looking

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 * this is to avoid looping though the same vehicles more than once after we learned that they are not free

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 * this feature is used by AllocateVehicles() since it need to allocate more than one and when

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 * another block is added to _Vehicle_pool, since we only do that when we know it's already full

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 */

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static Vehicle *AllocateSingleVehicle(VehicleID *skip_vehicles)

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{

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	/* See note by ForceAllocateSpecialVehicle() why we skip the

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	 * first blocks */

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	Vehicle *v;

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	const int offset = (1 << Vehicle_POOL_BLOCK_SIZE_BITS) * BLOCKS_FOR_SPECIAL_VEHICLES;

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	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.

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	 * @todo - This is just a temporary stage, this will be removed. */

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	if (*skip_vehicles < (_Vehicle_pool.total_items - offset)) { // make sure the offset in the array is not larger than the array itself

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		for (v = GetVehicle(offset + *skip_vehicles); v != NULL; v = (v->index + 1U < GetVehiclePoolSize()) ? GetVehicle(v->index + 1) : NULL) {

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			(*skip_vehicles)++;

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			if (!IsValidVehicle(v)) return InitializeVehicle(v);

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		}

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	}

   357

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	/* Check if we can add a block to the pool */

   359

	if (AddBlockToPool(&_Vehicle_pool))

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		return AllocateSingleVehicle(skip_vehicles);

   361

   362

	return NULL;

   363

}

   364

   365

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Vehicle *AllocateVehicle()

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{

   368

	VehicleID counter = 0;

   369

	return AllocateSingleVehicle(&counter);

   370

}

   371

   372

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/** Allocates a lot of vehicles and frees them again

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 * @param vl pointer to an array of vehicles to get allocated. Can be NULL if the vehicles aren't needed (makes it test only)

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 * @param num number of vehicles to allocate room for

   376

 * @return true if there is room to allocate all the vehicles

   377

 */

   378

bool AllocateVehicles(Vehicle **vl, int num)

   379

{

   380

	int i;

   381

	Vehicle *v;

   382

	VehicleID counter = 0;

   383

   384

	for (i = 0; i != num; i++) {

   385

		v = AllocateSingleVehicle(&counter);

   386

		if (v == NULL) {

   387

			return false;

   388

		}

   389

		if (vl != NULL) {

   390

			vl[i] = v;

   391

		}

   392

	}

   393

   394

	return true;

   395

}

   396

   442

   443

void *VehicleFromPos(TileIndex tile, void *data, VehicleFromPosProc *proc)

   444

{

   454

	}

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	return NULL;

   457

}

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