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#include "global.h"
#include "lottery_corner.h"
#include "event_data.h"
#include "constants/items.h"
#include "random.h"
#include "constants/species.h"
#include "string_util.h"
#include "text.h"
extern u16 gSpecialVar_Result;
extern u16 gSpecialVar_0x8004;
extern struct PokemonStorage gPokemonStorage;
extern u16 gSpecialVar_0x8005;
extern u16 gSpecialVar_0x8006;
static EWRAM_DATA u16 sWinNumberDigit = 0;
static EWRAM_DATA u16 sOtIdDigit = 0;
static const u16 sLotteryPrizes[] =
{
ITEM_PP_UP,
ITEM_EXP_SHARE,
ITEM_MAX_REVIVE,
ITEM_MASTER_BALL,
};
static u8 GetMatchingDigits(u16, u16);
void ResetLotteryCorner(void)
{
u16 rand = Random();
SetLotteryNumber((Random() << 16) | rand);
VarSet(VAR_LOTTERY_PRIZE, 0);
}
void SetRandomLotteryNumber(u16 i)
{
u32 var = Random();
while (--i != 0xFFFF)
var = var * 1103515245 + 12345;
SetLotteryNumber(var);
}
void RetrieveLotteryNumber(void)
{
u16 lottoNumber = GetLotteryNumber();
gSpecialVar_Result = lottoNumber;
}
void PickLotteryCornerTicket(void)
{
u16 i;
u16 j;
u32 box;
u32 slot;
gSpecialVar_0x8004 = 0;
slot = 0;
box = 0;
for (i = 0; i < 6; i++)
{
struct Pokemon *pkmn = &gPlayerParty[i];
// UB: Too few arguments for function GetMonData
if (GetMonData(pkmn, MON_DATA_SPECIES) != SPECIES_NONE)
{
// do not calculate ticket values for eggs.
if (!GetMonData(pkmn, MON_DATA_IS_EGG))
{
u32 otId = GetMonData(pkmn, MON_DATA_OT_ID);
u8 numMatchingDigits = GetMatchingDigits(gSpecialVar_Result, otId);
if (numMatchingDigits > gSpecialVar_0x8004 && numMatchingDigits > 1)
{
gSpecialVar_0x8004 = numMatchingDigits - 1;
box = 14;
slot = i;
}
}
}
else // pokemon are always arranged from populated spots first to unpopulated, so the moment a NONE species is found, that's the end of the list.
break;
}
// player has 14 boxes.
for (i = 0; i < 14; i++)
{
// player has 30 slots per box.
for (j = 0; j < 30; j++)
{
struct BoxPokemon *pkmn = &gPokemonStorage.boxes[i][j];
// UB: Too few arguments for function GetMonData
if (GetBoxMonData(pkmn, MON_DATA_SPECIES) != SPECIES_NONE &&
!GetBoxMonData(pkmn, MON_DATA_IS_EGG))
{
u32 otId = GetBoxMonData(pkmn, MON_DATA_OT_ID);
u8 numMatchingDigits = GetMatchingDigits(gSpecialVar_Result, otId);
if (numMatchingDigits > gSpecialVar_0x8004 && numMatchingDigits > 1)
{
gSpecialVar_0x8004 = numMatchingDigits - 1;
box = i;
slot = j;
}
}
}
}
if (gSpecialVar_0x8004 != 0)
{
gSpecialVar_0x8005 = sLotteryPrizes[gSpecialVar_0x8004 - 1];
if (box == 14)
{
gSpecialVar_0x8006 = 0;
GetMonData(&gPlayerParty[slot], MON_DATA_NICKNAME, gStringVar1);
}
else
{
gSpecialVar_0x8006 = 1;
GetBoxMonData(&gPokemonStorage.boxes[box][slot], MON_DATA_NICKNAME, gStringVar1);
}
StringGetEnd10(gStringVar1);
}
}
static u8 GetMatchingDigits(u16 winNumber, u16 otId)
{
u8 i;
u8 matchingDigits = 0;
for (i = 0; i < 5; i++)
{
sWinNumberDigit = winNumber % 10;
sOtIdDigit = otId % 10;
if (sWinNumberDigit == sOtIdDigit)
{
winNumber = winNumber / 10;
otId = otId / 10;
matchingDigits++;
}
else
break;
}
return matchingDigits;
}
// lottery numbers go from 0 to 99999, not 65535 (0xFFFF). interestingly enough, the function that calls GetLotteryNumber shifts to u16, so it cant be anything above 65535 anyway.
void SetLotteryNumber(u32 lotteryNum)
{
u16 high = lotteryNum >> 16;
u16 low = lotteryNum;
VarSet(VAR_LOTTERY_RND_L, low);
VarSet(VAR_LOTTERY_RND_H, high);
}
u32 GetLotteryNumber(void)
{
u16 low = VarGet(VAR_LOTTERY_RND_L);
u16 high = VarGet(VAR_LOTTERY_RND_H);
return (high << 16) | low;
}
// interestingly, this may have been the original lottery number set function, but GF tried to change it to 32-bit later but didnt finish changing all calls as one GetLotteryNumber still shifts to u16.
void SetLotteryNumber16_Unused(u16 lotteryNum)
{
SetLotteryNumber(lotteryNum);
}
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