/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel 2006 CaH4e3
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * It seems that 162/163/164 mappers are the same mapper with just different
 * mapper modes enabled or disabled in software or hardware, need more nanjing
 * carts
 */

#include "mapinc.h"

static uint8 laststrobe, trigger;
static uint8 reg[8];
static uint8 *WRAM = NULL;
static uint32 WRAMSIZE;

static writefunc pcmwrite;

static void (*WSync)(void);

static SFORMAT StateRegs[] =
{
	{ &laststrobe, 1, "STB" },
	{ &trigger, 1, "TRG" },
	{ reg, 8, "REGS" },
	{ 0 }
};

static void Sync(void) {
	setprg8r(0x10, 0x6000, 0);
	setprg32(0x8000, (reg[0] << 4) | (reg[1] & 0xF));
	setchr8(0);
}

static void StateRestore(int version) {
	WSync();
}

static DECLFR(ReadLow) {
	switch (A & 0x7700) {
	case 0x5100: return reg[2] | reg[0] | reg[1] | (reg[3] ^ 0xff); break;
	case 0x5500:
		if (trigger)
			return reg[2] | reg[1];   /* Lei Dian Huang Bi Ka Qiu Chuan Shuo (NJ046) may broke other games */
		else
			return 0;
	}
	return 4;
}

static void M163HB(void) {
	if (reg[1] & 0x80) {
		if (scanline == 239) {
			setchr4(0x0000, 0);
			setchr4(0x1000, 0);
		} else if (scanline == 127) {
			setchr4(0x0000, 1);
			setchr4(0x1000, 1);
		}
#if 0
			if(scanline>=127)     /* Hu Lu Jin Gang (NJ039) (Ch) [!] don't like it */
			{
				setchr4(0x0000,1);
				setchr4(0x1000,1);
			}
			else
			{
				setchr4(0x0000,0);
				setchr4(0x1000,0);
			}
#endif
	}
}

static DECLFW(Write) {
	switch (A & 0x7300) {
	case 0x5100: reg[0] = V; WSync(); break;
	case 0x5000: reg[1] = V; WSync(); break;
	case 0x5300: reg[2] = V; break;
	case 0x5200: reg[3] = V; WSync(); break;
	}
}

static void Power(void) {
	memset(reg, 0, 8);
	reg[1] = 0xFF;
	SetWriteHandler(0x5000, 0x5FFF, Write);
	SetReadHandler(0x6000, 0xFFFF, CartBR);
	SetWriteHandler(0x6000, 0x7FFF, CartBW);
	FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
	WSync();
}

static void Close(void) {
	if (WRAM)
		FCEU_gfree(WRAM);
	WRAM = NULL;
}

void Mapper164_Init(CartInfo *info) {
	info->Power = Power;
	info->Close = Close;
	WSync = Sync;

	WRAMSIZE = 8192;
	WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
	SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
	AddExState(WRAM, WRAMSIZE, 0, "WRAM");

	if (info->battery) {
		info->SaveGame[0] = WRAM;
		info->SaveGameLen[0] = WRAMSIZE;
	}

	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}

static DECLFW(Write2) {
	if (A == 0x5101) {
		if (laststrobe && !V) {
			trigger ^= 1;
		}
		laststrobe = V;
	} else if (A == 0x5100 && V == 6) /* damn those protected games */
		setprg32(0x8000, 3);
	else
		switch (A & 0x7300) {
		case 0x5200: reg[0] = V; WSync(); break;
		case 0x5000: reg[1] = V; WSync(); if (!(reg[1] & 0x80) && (scanline < 128)) setchr8(0); /* setchr8(0); */ break;
		case 0x5300: reg[2] = V; break;
		case 0x5100: reg[3] = V; WSync(); break;
		}
}

static void Power2(void) {
	memset(reg, 0, 8);
	laststrobe = 1;
	pcmwrite = GetWriteHandler(0x4011);
	SetReadHandler(0x5000, 0x5FFF, ReadLow);
	SetWriteHandler(0x5000, 0x5FFF, Write2);
	SetReadHandler(0x6000, 0xFFFF, CartBR);
	SetWriteHandler(0x6000, 0x7FFF, CartBW);
	FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
	WSync();
}

void Mapper163_Init(CartInfo *info) {
	info->Power = Power2;
	info->Close = Close;
	WSync = Sync;
	GameHBIRQHook = M163HB;

	WRAMSIZE = 8192;
	WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
	SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
	AddExState(WRAM, WRAMSIZE, 0, "WRAM");

	if (info->battery) {
		info->SaveGame[0] = WRAM;
		info->SaveGameLen[0] = WRAMSIZE;
	}
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}

static void Sync3(void) {
	setchr8(0);
	setprg8r(0x10, 0x6000, 0);
	switch (reg[3] & 7) {
	case 0:
	case 2: setprg32(0x8000, (reg[0] & 0xc) | (reg[1] & 2) | ((reg[2] & 0xf) << 4)); break;
	case 1:
	case 3: setprg32(0x8000, (reg[0] & 0xc) | (reg[2] & 0xf) << 4); break;
	case 4:
	case 6: setprg32(0x8000, (reg[0] & 0xe) | ((reg[1] >> 1) & 1) | ((reg[2] & 0xf) << 4)); break;
	case 5:
	case 7: setprg32(0x8000, (reg[0] & 0xf) | ((reg[2] & 0xf) << 4)); break;
	}
}

static DECLFW(Write3) {
/*	FCEU_printf("bs %04x %02x\n",A,V); */
	reg[(A >> 8) & 3] = V;
	WSync();
}

static void Power3(void) {
	reg[0] = 3;
	reg[1] = 0;
	reg[2] = 0;
	reg[3] = 7;
	SetWriteHandler(0x5000, 0x5FFF, Write3);
	SetReadHandler(0x6000, 0xFFFF, CartBR);
	SetWriteHandler(0x6000, 0x7FFF, CartBW);
	FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
	WSync();
}

void UNLFS304_Init(CartInfo *info) {
	info->Power = Power3;
	info->Close = Close;
	WSync = Sync3;

	WRAMSIZE = 8192;
	WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
	SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
	AddExState(WRAM, WRAMSIZE, 0, "WRAM");

	if (info->battery) {
		info->SaveGame[0] = WRAM;
		info->SaveGameLen[0] = WRAMSIZE;
	}

	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}
