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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "variables.h"

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#include "landscape.h"

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#include "debug.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_canal.h"

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/** Table of canal 'feature' sprite groups */

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const SpriteGroup *_canal_sg[CF_END];

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/* Random bits and triggers are not supported for canals, so the following

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 * three functions are stubs. */

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static uint32 CanalGetRandomBits(const ResolverObject *object)

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{

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	return 0;

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}

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static uint32 CanalGetTriggers(const ResolverObject *object)

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{

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	return 0;

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}

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

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{

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	return;

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}

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

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{

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	TileIndex tile = object->u.canal.tile;

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	switch (variable) {

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		case 0x80:

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			return TileHeight(tile);

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		case 0x81:

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			return ((_opt.landscape == LT_ARCTIC && GetTileZ(tile) > GetSnowLine()) ? 4 : 0) |

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			       (_opt.landscape == LT_TROPIC ? GetTropicZone(tile) : 0);

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	}

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	DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);

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	*available = false;

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	return 0;

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}

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

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{

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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 NewCanalResolver(ResolverObject *res, TileIndex tile)

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{

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	res->GetRandomBits = &CanalGetRandomBits;

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	res->GetTriggers   = &CanalGetTriggers;

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	res->SetTriggers   = &CanalSetTriggers;

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	res->GetVariable   = &CanalGetVariable;

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	res->ResolveReal   = &CanalResolveReal;

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	res->u.canal.tile = tile;

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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 GetCanalSprite(CanalFeature feature, TileIndex tile)

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{

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	ResolverObject object;

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	const SpriteGroup *group;

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	NewCanalResolver(&object, tile);

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	group = Resolve(_canal_sg[feature], &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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}