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/* $Id$ */

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/** @file ai_sign.cpp Implementation of AISign. */

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#include "ai_sign.hpp"

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#include "table/strings.h"

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#include "../../openttd.h"

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#include "../../command_func.h"

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#include "../../core/alloc_func.hpp"

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#include "../../signs_base.h"

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#include "../../string_func.h"

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#include "../../strings_func.h"

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#include "../../tile_map.h"

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/* static */ SignID AISign::GetMaxSignID()

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{

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	return ::GetMaxSignIndex();

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}

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/* static */ bool AISign::IsValidSign(SignID sign_id)

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{

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	return ::IsValidSignID(sign_id);

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}

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/* static */ char *AISign::GetText(SignID sign_id)

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{

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	if (!IsValidSign(sign_id)) return NULL;

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	static const int len = 64;

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	char *sign_name = MallocT<char>(len);

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	::SetDParam(0, sign_id);

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	::GetString(sign_name, STR_SIGN_NAME, &sign_name[len - 1]);

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	return sign_name;

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}

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/* static */ TileIndex AISign::GetLocation(SignID sign_id)

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{

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	if (!IsValidSign(sign_id)) return INVALID_TILE;

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	const Sign *sign = ::GetSign(sign_id);

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	return ::TileVirtXY(sign->x, sign->y);

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}

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/* static */ bool AISign::RemoveSign(SignID sign_id)

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{

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	EnforcePrecondition(false, IsValidSign(sign_id));

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	_cmd_text = "";

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	return AIObject::DoCommand(0, sign_id, 0, CMD_RENAME_SIGN);

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}

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/* static */ SignID AISign::BuildSign(TileIndex location, const char *text)

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{

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	EnforcePrecondition(INVALID_SIGN, ::IsValidTile(location));

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	EnforcePrecondition(INVALID_SIGN, !StrEmpty(text));

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	/* Reset the internal NewSignID in case we are in TestMode */

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	AIObject::SetNewSignID(0);

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	bool ret = AIObject::DoCommand(location, 0, 0, CMD_PLACE_SIGN);

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	if (!ret) return INVALID_SIGN;

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	SignID new_sign_id = AIObject::GetNewSignID();

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	_cmd_text = text;

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	ret = AIObject::DoCommand(0, new_sign_id, 0, CMD_RENAME_SIGN);

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	if (!ret) {

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		RemoveSign(new_sign_id);

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		return INVALID_SIGN;

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	}

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	return new_sign_id;

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}