//////////////////////////////////////////////////////////////////////////
// Mapper051  11-in-1                                                   //
//////////////////////////////////////////////////////////////////////////
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 Mapper051 : Mapper
	{
		int mode, bank;
		public Mapper051(NES parent) : base(parent)
		{
		}

		public override void Reset()
		{
			bank = 0;
			mode = 1;

			SetBank_CPU();
			SetCRAM_8K_Bank(0);
		}

		//void Mapper051::WriteLow(WORD addr, BYTE data)
		public override void WriteLow(ushort addr, byte data)
		{
			if (addr >= 0x6000)
			{
				mode = ((data & 0x10) >> 3) | ((data & 0x02) >> 1);
				SetBank_CPU();
			}
		}

		//void Mapper051::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			bank = (data & 0x0f) << 2;
			if (0xC000 <= addr && addr <= 0xDFFF)
			{
				mode = (mode & 0x01) | ((data & 0x10) >> 3);
			}
			SetBank_CPU();
		}

		void SetBank_CPU()
		{
			switch (mode)
			{
				case 0:
					SetVRAM_Mirror(VRAM_VMIRROR);
					SetPROM_8K_Bank(3, (bank | 0x2c | 3));
					SetPROM_8K_Bank(4, (bank | 0x00 | 0));
					SetPROM_8K_Bank(5, (bank | 0x00 | 1));
					SetPROM_8K_Bank(6, (bank | 0x0c | 2));
					SetPROM_8K_Bank(7, (bank | 0x0c | 3));
					break;
				case 1:
					SetVRAM_Mirror(VRAM_VMIRROR);
					SetPROM_8K_Bank(3, (bank | 0x20 | 3));
					SetPROM_8K_Bank(4, (bank | 0x00 | 0));
					SetPROM_8K_Bank(5, (bank | 0x00 | 1));
					SetPROM_8K_Bank(6, (bank | 0x00 | 2));
					SetPROM_8K_Bank(7, (bank | 0x00 | 3));
					break;
				case 2:
					SetVRAM_Mirror(VRAM_VMIRROR);
					SetPROM_8K_Bank(3, (bank | 0x2e | 3));
					SetPROM_8K_Bank(4, (bank | 0x02 | 0));
					SetPROM_8K_Bank(5, (bank | 0x02 | 1));
					SetPROM_8K_Bank(6, (bank | 0x0e | 2));
					SetPROM_8K_Bank(7, (bank | 0x0e | 3));
					break;
				case 3:
					SetVRAM_Mirror(VRAM_HMIRROR);
					SetPROM_8K_Bank(3, (bank | 0x20 | 3));
					SetPROM_8K_Bank(4, (bank | 0x00 | 0));
					SetPROM_8K_Bank(5, (bank | 0x00 | 1));
					SetPROM_8K_Bank(6, (bank | 0x00 | 2));
					SetPROM_8K_Bank(7, (bank | 0x00 | 3));
					break;
			}
		}

		//void Mapper051::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			p[0] = (byte)mode;
			p[1] = (byte)bank;
		}

		//void Mapper051::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			mode = p[0];
			bank = p[1];
		}


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