//////////////////////////////////////////////////////////////////////////
// Mapper163  NanJing Games                                             //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
using Codice.CM.Client.Differences;

namespace VirtualNes.Core
{
	public class Mapper163 : Mapper
	{
		//BYTE    strobe;
		//BYTE	security;
		//BYTE	trigger;
		//BYTE	rom_type;

		//BYTE	reg[2];
		BYTE laststrobe, trigger;
		BYTE[] reg = new byte[8];
		public Mapper163(NES parent) : base(parent)
		{
			/*
			reg[1] = 0xFF;
			strobe = 1;
			security = trigger = reg[0] = 0x00;
			rom_type = 0;
			SetPROM_32K_Bank(15);

			DWORD	crc = nes.rom.GetPROM_CRC();
			if( crc == 0xb6a10d5d ) {	// Hu Lu Jin Gang (NJ039) (Ch) [dump]
				SetPROM_32K_Bank(0);
			}
			if( crc == 0xf52468e7 ) {	// San Guo Wu Shuang - Meng Jiang Zhuan (NJ047) (Ch) [dump]
				rom_type = 1;
			}
			*/
			memset(reg, 0, 8);
			laststrobe = 1;
			SetPROM_32K_Bank((reg[0] << 4) | (reg[1] & 0xF));
			//SetPROM_32K_Bank(0);
			SetCRAM_8K_Bank(0);
		}

		//BYTE Mapper163::ReadLow(WORD A)
		public override byte ReadLow(ushort A)
		{
			/*
			if((addr>=0x5000 && addr<0x6000))
			{
				switch (addr & 0x7700)
				{
					case 0x5100:
							return security;
							break;
					case 0x5500:
							if(trigger)
								return security;
							else
								return 0;
							break;
				}
				return 4;
			}
			else if( addr>=0x6000 ) {
				return	CPU_MEM_BANK[addr>>13][addr&0x1FFF];
			}
			return Mapper::ReadLow( addr );
			*/
			if ((A < 0x6000) && (A >= 0x5000))
			{
				switch (A & 0x7700)
				{
					case 0x5100: return (byte)(reg[2] | reg[0] | reg[1] | reg[3] ^ 0xff); break;
					case 0x5500:
						if (trigger != 0)
							return (byte)(reg[2] | reg[1]); // Lei Dian Huang Bi Ka Qiu Chuan Shuo (NJ046) may broke other games
						else
							return 0;
				}
				return 4;
			}
			else
				return base.ReadLow(A);
		}

		//void Mapper163::WriteLow(WORD A, BYTE V)
		public override void WriteLow(ushort A, byte V)
		{
			/*
			if((addr>=0x4020 && addr<0x6000))
			{
				DEBUGOUT("W %.4X %.2X\n",addr,data);
				if(addr==0x5101){
					if(strobe && !data){
						trigger ^= 1;
		//				trigger ^= 0xFF;
					}
					strobe = data;
				}else if(addr==0x5100 && data==6){
					SetPROM_32K_Bank(3);
				}
				else{
					switch (addr & 0x7300)
					{
						case 0x5000:
								reg[1]=data;
								SetPROM_32K_Bank( (reg[1] & 0xF) | (reg[0] << 4) );
								if(!(reg[1]&0x80)&&(nes.ppu.GetScanlineNo()<128))
									SetCRAM_8K_Bank(0);
								if(rom_type==1) SetCRAM_8K_Bank(0);
								break;
						case 0x5200:
								reg[0]=data;
								SetPROM_32K_Bank( (reg[1] & 0xF) | (reg[0] << 4) );
								break;
						case 0x5300:
								security=data;
								break;
					}
				}
			}
			else if( addr>=0x6000 ) {
				CPU_MEM_BANK[addr>>13][addr&0x1FFF] = data;
			}
			*/
			if ((A < 0x6000) && (A >= 0x5000))
			{
				if (A == 0x5300)
				{
					A = (ushort)(A + 1 - 1);
				}

				if (A == 0x5101)
				{
					if (laststrobe != 0 && V == 0)
					{
						trigger ^= 1;
					}
					laststrobe = V;
				}
				else if (A == 0x5100 && V == 6) //damn thoose protected games
					SetPROM_32K_Bank(3);
				else
				{
					switch (A & 0x7300)
					{
						case 0x5200: reg[0] = V; SetPROM_32K_Bank((reg[0] << 4) | reg[1] & 0xF); SetCRAM_8K_Bank(0); break;
						case 0x5000: reg[1] = V; SetPROM_32K_Bank((reg[0] << 4) | reg[1] & 0xF); SetCRAM_8K_Bank(0); if ((reg[1] & 0x80) == 0 && (nes.GetScanline() < 128)) SetCRAM_8K_Bank(0); break;
						case 0x5300: reg[2] = V; break;
						case 0x5100: reg[3] = V; SetPROM_32K_Bank((reg[0] << 4) | reg[1] & 0xF); SetCRAM_8K_Bank(0); break;
					}
				}
			}
			//071
			else if ((A & 0xFF00) == 0x4800)
			{
				//512KרÓÃ
				if (PROM_8K_SIZE == 64)
				{
					reg[A & 3] = V;
					if (A == 0x4802)
						SetPROM_32K_Bank(((reg[1] >> 1) & 3) | (reg[2] << 2));
				}
			}
			else
				base.WriteLow(A, V);
		}

		//void Mapper163::HSync(int scanline)
		public override void HSync(int scanline)
		{
			//sline = scanline;
			/*
			if( (reg[1]&0x80) && nes.ppu.IsDispON() ) {
				if(scanline==127){
					SetCRAM_4K_Bank(0, 1);
					SetCRAM_4K_Bank(4, 1);
				}
				if (rom_type==1){
					if(scanline<127){
						SetCRAM_4K_Bank(0, 0);
						SetCRAM_4K_Bank(4, 0);
					}
				}else{
					if(scanline==239){
						SetCRAM_4K_Bank(0, 0);
						SetCRAM_4K_Bank(4, 0);
					}
				}
			}
			*/
			if ((reg[1] & 0x80) != 0)
			{
				if (scanline == 239)
				{
					SetCRAM_4K_Bank(0, 0);
					SetCRAM_4K_Bank(4, 0);
				}
				else if (scanline == 127)
				{
					SetCRAM_4K_Bank(0, 1);
					SetCRAM_4K_Bank(4, 1);
				}
			}
		}

		//void Mapper163::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			//p[0] = reg[0];
			//p[1] = reg[1];
			for (byte i = 0; i < 8; i++)
				p[i] = reg[i];
			p[8] = laststrobe;
			p[9] = trigger;
		}

		//void Mapper163::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{

			//reg[0] = p[0];
			//reg[1] = p[1];
			for (byte i = 0; i < 8; i++)
				reg[i] = p[i];
			laststrobe = p[8];
			trigger = p[9];
		}

		public override void Reset()
		{
		}

	}
}