////////////////////////////////
// Mapper096  Bandai 74161                                              //
//////////////////////////////////////////////////////////////////////////
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 Mapper096 : Mapper
	{
		BYTE[] reg = new byte[2];
		public Mapper096(NES parent) : base(parent)
		{
		}

		public override void Reset()
		{
			reg[0] = reg[1] = 0;

			SetPROM_32K_Bank(0, 1, 2, 3);
			SetBank();

			SetVRAM_Mirror(VRAM_MIRROR4L);
		}

		//void Mapper096::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			SetPROM_32K_Bank(data & 0x03);

			reg[0] = (byte)((data & 0x04) >> 2);
			SetBank();
		}

		public override void PPU_Latch(ushort addr)
		{
			if ((addr & 0xF000) == 0x2000)
			{
				reg[1] = (byte)((addr >> 8) & 0x03);
				SetBank();
			}
		}

		void SetBank()
		{
			SetCRAM_4K_Bank(0, reg[0] * 4 + reg[1]);
			SetCRAM_4K_Bank(4, reg[0] * 4 + 0x03);
		}

		//void Mapper096::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			p[0] = reg[0];
			p[1] = reg[1];
		}

		//void Mapper096::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			reg[0] = p[0];
			reg[1] = p[1];
		}


		public override bool IsStateSave()
		{
			return true;
		}

	}
}