/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2007 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
 */

#include "mapinc.h"

static uint8 reg[4];
static uint8 *WRAM = NULL;
static uint32 WRAMSIZE;

static SFORMAT StateRegs[] =
{
	{ reg, 4, "REGS" },
	{ 0 }
};

static void Sync(void) {
	uint8 bank = (reg[2] & 3) << 3;
	setmirror((reg[0] & 1) ^ 1);
	setprg8r(0x10, 0x6000, 0);
	setchr8(0);
	if (reg[0] & 2) {
		setprg16(0x8000, (reg[1] & 7) | bank);
		setprg16(0xC000, ((~0) & 7) | bank);
	} else {
		setprg16(0x8000, (reg[1] & 6) | bank);
		setprg16(0xC000, (reg[1] & 6) | bank | 1);
	}
}

static DECLFW(M178Write) {
	reg[A & 3] = V;
	Sync();
}

static void M178Power(void) {
	reg[0] = 1;
	reg[1] = 0;
	reg[2] = 0;
	reg[3] = 0;
	Sync();
	SetReadHandler(0x6000, 0x7FFF, CartBR);
	SetWriteHandler(0x6000, 0x7FFF, CartBW);
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x4800, 0x4803, M178Write);
}

static void M178Close(void) {
	if (WRAM)
		FCEU_gfree(WRAM);
	WRAM = NULL;
}


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

void Mapper178_Init(CartInfo *info) {
	info->Power = M178Power;
	info->Close = M178Close;
	GameStateRestore = StateRestore;

	WRAMSIZE = 8192;
	WRAM = (uint8*)FCEU_gmalloc(WRAMSIZE);
	SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
	if (info->battery) {
		info->SaveGame[0] = WRAM;
		info->SaveGameLen[0] = WRAMSIZE;
	}
	AddExState(WRAM, WRAMSIZE, 0, "WRAM");

	AddExState(&StateRegs, ~0, 0, 0);
}