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/* $Id$ */

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/** @file currency.cpp **/

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#include "stdafx.h"

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#include "openttd.h"

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#include "currency.h"

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#include "news.h"

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#include "settings_type.h"

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#include "date_func.h"

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#include "table/strings.h"

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	//   exchange rate    prefix             symbol_pos

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	//   |  separator        |     postfix   |

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	//   |   |    Euro year  |       |       |    name

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	//   |   |    |          |       |       |    |

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static const CurrencySpec origin_currency_specs[NUM_CURRENCY] = {

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	{    1, ',', CF_NOEURO, "£",    "",      0,  STR_CURR_GBP    }, ///< british pounds

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	{    2, ',', CF_NOEURO, "$",    "",      0,  STR_CURR_USD    }, ///< us dollars

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	{    2, ',', CF_ISEURO, "€",    "",      0,  STR_CURR_EUR    }, ///< Euro

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	{  220, ',', CF_NOEURO, "¥",    "",      0,  STR_CURR_YEN    }, ///< yen

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	{   20, ',', 2002,      "",     " S.",   1,  STR_CURR_ATS    }, ///< austrian schilling

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	{   59, ',', 2002,      "BEF ", "",      0,  STR_CURR_BEF    }, ///< belgian franc

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	{    2, ',', CF_NOEURO, "CHF ", "",      0,  STR_CURR_CHF    }, ///< swiss franc

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	{   41, ',', CF_NOEURO, "",     " Kč",   1,  STR_CURR_CZK    }, ///< czech koruna

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	{    3, '.', 2002,      "DM ",  "",      0,  STR_CURR_DEM    }, ///< deutsche mark

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	{   11, '.', CF_NOEURO, "",     " kr",   1,  STR_CURR_DKK    }, ///< danish krone

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	{  245, '.', 2002,      "Pts ", "",      0,  STR_CURR_ESP    }, ///< spanish pesetas

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	{    9, ',', 2002,      "",     " mk",   1,  STR_CURR_FIM    }, ///< finnish markka

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	{   10, '.', 2002,      "FF ",  "",      0,  STR_CURR_FRF    }, ///< french francs

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	{  500, ',', 2002,      "",     "Dr.",   1,  STR_CURR_GRD    }, ///< greek drachma

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	{  378, ',', 2010,      "",     " Ft",   1,  STR_CURR_HUF    }, ///< hungarian forint

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	{  130, '.', CF_NOEURO, "",     " Kr",   1,  STR_CURR_ISK    }, ///< icelandic krona

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	{ 2850, ',', 2002,      "",     " L.",   1,  STR_CURR_ITL    }, ///< italian lira

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	{    3, ',', 2002,      "NLG ", "",      0,  STR_CURR_NLG    }, ///< dutch gulden

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	{   12, '.', CF_NOEURO, "",     " Kr",   1,  STR_CURR_NOK    }, ///< norwegian krone

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	{    6, ' ', CF_NOEURO, "",     " zl",   1,  STR_CURR_PLN    }, ///< polish zloty

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	{    5, '.', CF_NOEURO, "",     " Lei",  1,  STR_CURR_ROL    }, ///< romanian Lei

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	{   50, ' ', CF_NOEURO, "",     " p",    1,  STR_CURR_RUR    }, ///< russian rouble

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	{  352, '.', CF_NOEURO, "",     " SIT",  1,  STR_CURR_SIT    }, ///< slovenian tolar

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	{   13, '.', CF_NOEURO, "",     " Kr",   1,  STR_CURR_SEK    }, ///< swedish krona

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	{    3, '.', CF_NOEURO, "",     " YTL",  1,  STR_CURR_YTL    }, ///< turkish lira

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	{   52, ',', CF_NOEURO, "",     " Sk",   1,  STR_CURR_SKK    }, ///< slovak koruna

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	{    4, ',', CF_NOEURO, "R$ ",  "",      0,  STR_CURR_BRR    }, ///< brazil real

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	{    1, ' ', CF_NOEURO, "",     "",      2,  STR_CURR_CUSTOM }, ///< custom currency

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};

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/* Array of currencies used by the system */

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CurrencySpec _currency_specs[NUM_CURRENCY];

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/**

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 * These enums are only declared in order to make sens

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 * out of the TTDPatch_To_OTTDIndex array that will follow

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 * Every currency used by Ottd is there, just in case TTDPatch will

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 * add those missing in its code

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 **/

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enum {

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	CURR_GBP,

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	CURR_USD,

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	CURR_EUR,

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	CURR_YEN,

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	CURR_ATS,

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	CURR_BEF,

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	CURR_CHF,

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	CURR_CZK,

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	CURR_DEM,

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	CURR_DKK,

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	CURR_ESP,

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	CURR_FIM,

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	CURR_FRF,

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	CURR_GRD,

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	CURR_HUF,

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	CURR_ISK,

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	CURR_ITL,

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	CURR_NLG,

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	CURR_NOK,

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	CURR_PLN,

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	CURR_ROL,

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	CURR_RUR,

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	CURR_SIT,

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	CURR_SEK,

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	CURR_YTL,

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};

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/**

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 * This array represent the position of OpenTTD's currencies,

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 * compared to TTDPatch's ones.

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 * When a grf sends currencies, they are based on the order defined by TTDPatch.

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 * So, we must reindex them to our own order.

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 **/

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const byte TTDPatch_To_OTTDIndex[] =

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{

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	CURR_GBP,

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	CURR_USD,

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	CURR_FRF,

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	CURR_DEM,

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	CURR_YEN,

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	CURR_ESP,

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	CURR_HUF,

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	CURR_PLN,

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	CURR_ATS,

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	CURR_BEF,

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	CURR_DKK,

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	CURR_FIM,

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	CURR_GRD,

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	CURR_CHF,

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	CURR_NLG,

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	CURR_ITL,

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	CURR_SEK,

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	CURR_RUR,

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	CURR_EUR,

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};

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/**

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 * Will return the ottd's index correspondance to

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 * the ttdpatch's id.  If the id is bigger then the array,

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 * it is  a grf written for ottd, thus returning the same id.

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 * Only called from newgrf.c

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 * @param grfcurr_id currency id coming from newgrf

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 * @return the corrected index

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 **/

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byte GetNewgrfCurrencyIdConverted(byte grfcurr_id)

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{

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	return (grfcurr_id >= lengthof(TTDPatch_To_OTTDIndex)) ? grfcurr_id : TTDPatch_To_OTTDIndex[grfcurr_id];

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}

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/**

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 * get a mask of the allowed currencies depending on the year

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 * @return mask of currencies

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 */

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uint GetMaskOfAllowedCurrencies()

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{

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	uint mask = 0;

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	uint i;

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	for (i = 0; i < NUM_CURRENCY; i++) {

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		Year to_euro = _currency_specs[i].to_euro;

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		if (to_euro != CF_NOEURO && to_euro != CF_ISEURO && _cur_year >= to_euro) continue;

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		if (to_euro == CF_ISEURO && _cur_year < 2000) continue;

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		mask |= (1 << i);

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	}

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	mask |= (1 << CUSTOM_CURRENCY_ID); // always allow custom currency

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	return mask;

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}

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/**

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 * Verify if the currency chosen by the user is about to be converted to Euro

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 **/

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void CheckSwitchToEuro()

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{

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	if (_currency_specs[_opt.currency].to_euro != CF_NOEURO &&

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			_currency_specs[_opt.currency].to_euro != CF_ISEURO &&

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			_cur_year >= _currency_specs[_opt.currency].to_euro) {

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		_opt.currency = 2; // this is the index of euro above.

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		AddNewsItem(STR_EURO_INTRODUCE, NEWS_FLAGS(NM_NORMAL, 0, NT_ECONOMY, 0), 0, 0);

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	}

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}

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/**

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 * Will fill _currency_specs array with

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 * default values from origin_currency_specs

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 * Called only from newgrf.cpp and settings.cpp.

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 * @param preserve_custom will not reset custom currency (the latest one on the list)

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 *        if ever it is flagged to true. In which case, the total size of the memory to move

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 *        will be one currency spec less, thus preserving the custom curreny from been

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 *        overwritten.

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 **/

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void ResetCurrencies(bool preserve_custom)

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{

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	memcpy(&_currency_specs, &origin_currency_specs, sizeof(origin_currency_specs) - (preserve_custom ? sizeof(_custom_currency) : 0));

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}

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/**

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 * Build a list of currency names StringIDs to use in a dropdown list

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 * @return Pointer to a (static) array of StringIDs

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 */

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StringID* BuildCurrencyDropdown()

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{

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	/* Allow room for all currencies, plus a terminator entry */

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	static StringID names[NUM_CURRENCY + 1];

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	uint i;

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	/* Add each name */

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	for (i = 0; i < NUM_CURRENCY; i++) {

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		names[i] = _currency_specs[i].name;

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	}

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	/* Terminate the list */

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	names[i] = INVALID_STRING_ID;

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	return names;

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}