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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "debug.h"

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#include "cargotype.h"

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#include "newgrf.h"

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#include "newgrf_callbacks.h"

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#include "newgrf_spritegroup.h"

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#include "newgrf_cargo.h"

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static uint32 CargoGetRandomBits(const ResolverObject *object)

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{

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	return 0;

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}

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static uint32 CargoGetTriggers(const ResolverObject *object)

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{

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	return 0;

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}

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static void CargoSetTriggers(const ResolverObject *object, int triggers)

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{

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	return;

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}

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static uint32 CargoGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)

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{

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	DEBUG(grf, 1, "Unhandled cargo property 0x%X", variable);

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	*available = false;

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	return 0;

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}

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static const SpriteGroup *CargoResolveReal(const ResolverObject *object, const SpriteGroup *group)

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{

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	/* Cargo action 2s should always have only 1 "loaded" state */

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	if (group->g.real.num_loaded == 0) return NULL;

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	return group->g.real.loaded[0];

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}

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static void NewCargoResolver(ResolverObject *res, const CargoSpec *cs)

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{

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	res->GetRandomBits = &CargoGetRandomBits;

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	res->GetTriggers   = &CargoGetTriggers;

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	res->SetTriggers   = &CargoSetTriggers;

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	res->GetVariable   = &CargoGetVariable;

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	res->ResolveReal   = &CargoResolveReal;

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	res->u.cargo.cs = cs;

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	res->callback        = 0;

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	res->callback_param1 = 0;

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	res->callback_param2 = 0;

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	res->last_value      = 0;

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	res->trigger         = 0;

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	res->reseed          = 0;

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}

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SpriteID GetCustomCargoSprite(const CargoSpec *cs)

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{

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	const SpriteGroup *group;

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	ResolverObject object;

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	NewCargoResolver(&object, cs);

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	group = Resolve(cs->group, &object);

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	if (group == NULL || group->type != SGT_RESULT) return 0;

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	return group->g.result.sprite;

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}

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uint16 GetCargoCallback(uint16 callback, uint32 param1, uint32 param2, const CargoSpec *cs)

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{

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	ResolverObject object;

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	const SpriteGroup *group;

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	NewCargoResolver(&object, cs);

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	object.callback = callback;

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	object.callback_param1 = param1;

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	object.callback_param2 = param2;

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	group = Resolve(cs->group, &object);

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	if (group == NULL || group->type != SGT_CALLBACK) return CALLBACK_FAILED;

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	return group->g.callback.result;

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}