//////////////////////////////////////////////////////////////////////////
// Mapper075  Konami VRC1/Jaleco D65005                                 //
//////////////////////////////////////////////////////////////////////////
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 Mapper075 : Mapper
	{
		BYTE[] reg = new byte[2];
		public Mapper075(NES parent) : base(parent)
		{
		}

		public override void Reset()

		{
			SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);

			if (VROM_8K_SIZE != 0)
			{
				SetVROM_8K_Bank(0);
			}
			reg[0] = 0;
			reg[1] = 1;
		}

		//void Mapper075::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			switch (addr & 0xF000)
			{
				case 0x8000:
					SetPROM_8K_Bank(4, data);
					break;

				case 0x9000:
					if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
					else SetVRAM_Mirror(VRAM_VMIRROR);

					reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x02) << 3));
					reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x04) << 2));
					SetVROM_4K_Bank(0, reg[0]);
					SetVROM_4K_Bank(4, reg[1]);
					break;

				case 0xA000:
					SetPROM_8K_Bank(5, data);
					break;
				case 0xC000:
					SetPROM_8K_Bank(6, data);
					break;

				case 0xE000:
					reg[0] = (byte)((reg[0] & 0x10) | (data & 0x0F));
					SetVROM_4K_Bank(0, reg[0]);
					break;

				case 0xF000:
					reg[1] = (byte)((reg[1] & 0x10) | (data & 0x0F));
					SetVROM_4K_Bank(4, reg[1]);
					break;
			}
		}

		//void Mapper075::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			p[0] = reg[0];
			p[1] = reg[1];
		}

		//void Mapper075::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			reg[0] = p[0];
			reg[1] = p[1];
		}

		public override bool IsStateSave()
		{
			return true;
		}
	}
}