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/* $Id$ */

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/** @file articulated_vehicles.cpp */

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#include "stdafx.h"

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#include "openttd.h"

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#include "functions.h"

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#include "command.h"

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#include "vehicle.h"

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#include "articulated_vehicles.h"

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#include "engine.h"

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#include "train.h"

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#include "roadveh.h"

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#include "newgrf_callbacks.h"

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#include "newgrf_engine.h"

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uint CountArticulatedParts(EngineID engine_type)

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{

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	if (!HASBIT(EngInfo(engine_type)->callbackmask, CBM_ARTIC_ENGINE)) return 0;

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	uint i;

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	for (i = 1; i < 10; i++) {

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		uint16 callback = GetVehicleCallback(CBID_VEHICLE_ARTIC_ENGINE, i, 0, engine_type, NULL);

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		if (callback == CALLBACK_FAILED || callback == 0xFF) break;

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	}

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	return i - 1;

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}

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void AddArticulatedParts(Vehicle **vl, VehicleType type)

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{

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	const Vehicle *v = vl[0];

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	Vehicle *u = vl[0];

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	if (!HASBIT(EngInfo(v->engine_type)->callbackmask, CBM_ARTIC_ENGINE)) return;

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	for (uint i = 1; i < 10; i++) {

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		uint16 callback = GetVehicleCallback(CBID_VEHICLE_ARTIC_ENGINE, i, 0, v->engine_type, v);

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		if (callback == CALLBACK_FAILED || callback == 0xFF) return;

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		/* Attempt to use pre-allocated vehicles until they run out. This can happen

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		 * if the callback returns different values depending on the cargo type. */

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		u->next = vl[i];

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		if (u->next == NULL) u->next = AllocateVehicle();

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		if (u->next == NULL) return;

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		u = u->next;

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		EngineID engine_type = GetFirstEngineOfType(type) + GB(callback, 0, 7);

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		bool flip_image = HASBIT(callback, 7);

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		/* get common values from first engine */

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		u->direction = v->direction;

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		u->owner = v->owner;

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		u->tile = v->tile;

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		u->x_pos = v->x_pos;

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		u->y_pos = v->y_pos;

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		u->z_pos = v->z_pos;

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		u->build_year = v->build_year;

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		u->vehstatus = v->vehstatus & ~VS_STOPPED;

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		u->cargo_subtype = 0;

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		u->max_speed = 0;

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		u->max_age = 0;

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		u->engine_type = engine_type;

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		u->value = 0;

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		u->subtype = 0;

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		u->cur_image = 0xAC2;

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		u->random_bits = VehicleRandomBits();

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		switch (type) {

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			default: NOT_REACHED();

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			case VEH_TRAIN: {

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				const RailVehicleInfo *rvi_artic = RailVehInfo(engine_type);

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				u = new (u) Train();

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				u->u.rail.track = v->u.rail.track;

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				u->u.rail.railtype = v->u.rail.railtype;

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				u->u.rail.first_engine = v->engine_type;

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				u->spritenum = rvi_artic->image_index;

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				u->cargo_type = rvi_artic->cargo_type;

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				u->cargo_cap = rvi_artic->capacity;

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				SetArticulatedPart(u);

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			} break;

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			case VEH_ROAD: {

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				const RoadVehicleInfo *rvi_artic = RoadVehInfo(engine_type);

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				u = new (u) RoadVehicle();

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				u->u.road.first_engine = v->engine_type;

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				u->u.road.cached_veh_length = GetRoadVehLength(u);

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				u->u.road.state = RVSB_IN_DEPOT;

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				u->u.road.roadtype = v->u.road.roadtype;

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				u->u.road.compatible_roadtypes = v->u.road.compatible_roadtypes;

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				u->spritenum = rvi_artic->image_index;

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				u->cargo_type = rvi_artic->cargo_type;

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				u->cargo_cap = rvi_artic->capacity;

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				SetRoadVehArticPart(u);

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			} break;

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		}

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		if (flip_image) u->spritenum++;

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		VehiclePositionChanged(u);

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	}

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}