/* $Id$ */

#include "stdafx.h"

#include "openttd.h"

#include "currency.h"

#include "news.h"

#include "variables.h"

#include "table/strings.h"

#include "date.h"

	//   exchange rate    prefix             symbol_pos

	//   |  separator        |     postfix   |

	//   |   |    Euro year  |       |       |    name

	//   |   |    |          |       |       |    |

static const CurrencySpec origin_currency_specs[NUM_CURRENCY] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

};

/* Array of currencies used by the system */

CurrencySpec _currency_specs[NUM_CURRENCY];

/**

 * These enums are only declared in order to make sens

 * out of the TTDPatch_To_OTTDIndex array that will follow

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

 * add those missing in its code

 **/

enum {

	CURR_GBP,

	CURR_USD,

	CURR_EUR,

	CURR_YEN,

	CURR_ATS,

	CURR_BEF,

	CURR_CHF,

	CURR_CZK,

	CURR_DEM,

	CURR_DKK,

	CURR_ESP,

	CURR_FIM,

	CURR_FRF,

	CURR_GRD,

	CURR_HUF,

	CURR_ISK,

	CURR_ITL,

	CURR_NLG,

	CURR_NOK,

	CURR_PLN,

	CURR_ROL,

	CURR_RUR,

	CURR_SIT,

	CURR_SEK,

	CURR_YTL,

};

/**

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

 * compared to TTDPatch's ones.

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

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

 **/

const byte TTDPatch_To_OTTDIndex[] =

{

	CURR_GBP,

	CURR_USD,

	CURR_FRF,

	CURR_DEM,

	CURR_YEN,

	CURR_ESP,

	CURR_HUF,

	CURR_PLN,

	CURR_ATS,

	CURR_BEF,

	CURR_DKK,

	CURR_FIM,

	CURR_GRD,

	CURR_CHF,

	CURR_NLG,

	CURR_ITL,

	CURR_SEK,

	CURR_RUR,

	CURR_EUR,

};

/**

 * Will return the ottd's index correspondance to

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

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

 * Only called from newgrf.c

 * @param grfcurr_id currency id coming from newgrf

 * @return the corrected index

 **/

byte GetNewgrfCurrencyIdConverted(byte grfcurr_id)

{

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

}

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

uint GetMaskOfAllowedCurrencies(void)

{

	uint mask = 0;

	uint i;

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

		Year to_euro = _currency_specs[i].to_euro;

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

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

		mask |= (1 << i);

	}

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

	return mask;

}

/**

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

 **/

void CheckSwitchToEuro(void)

{

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

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

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

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

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

	}

}

/**

 * Called only from newgrf.c.  Will fill _currency_specs array with

 * default values from origin_currency_specs

 **/

void ResetCurrencies(void)

{

	memcpy(&_currency_specs, &origin_currency_specs, sizeof(origin_currency_specs));

}

/**

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

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

 */

StringID* BuildCurrencyDropdown(void)

{

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

	static StringID names[CUSTOM_CURRENCY_ID];

	uint i;

	/* Add each name */

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

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

	}

	/* Terminate the list */

	names[i] = INVALID_STRING_ID;

	return names;

}