//////////////////////////////////////////////////////////////////////////
// Mapper057                                                            //
//////////////////////////////////////////////////////////////////////////
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 Mapper057 : Mapper
	{

		BYTE reg;
		public Mapper057(NES parent) : base(parent)
		{
		}

		public override void Reset()
		{
			SetPROM_32K_Bank(0, 1, 0, 1);
			SetVROM_8K_Bank(0);
			reg = 0;
		}

		//void Mapper057::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			switch (addr)
			{
				case 0x8000:
				case 0x8001:
				case 0x8002:
				case 0x8003:
					if ((data & 0x40) != 0)
					{
						SetVROM_8K_Bank((data & 0x03) + ((reg & 0x10) >> 1) + (reg & 0x07));
					}
					break;
				case 0x8800:
					reg = data;

					if ((data & 0x80) != 0)
					{
						SetPROM_8K_Bank(4, ((data & 0x40) >> 6) * 4 + 8 + 0);
						SetPROM_8K_Bank(5, ((data & 0x40) >> 6) * 4 + 8 + 1);
						SetPROM_8K_Bank(6, ((data & 0x40) >> 6) * 4 + 8 + 2);
						SetPROM_8K_Bank(7, ((data & 0x40) >> 6) * 4 + 8 + 3);
					}
					else
					{
						SetPROM_8K_Bank(4, ((data & 0x60) >> 5) * 2 + 0);
						SetPROM_8K_Bank(5, ((data & 0x60) >> 5) * 2 + 1);
						SetPROM_8K_Bank(6, ((data & 0x60) >> 5) * 2 + 0);
						SetPROM_8K_Bank(7, ((data & 0x60) >> 5) * 2 + 1);
					}

					SetVROM_8K_Bank((data & 0x07) + ((data & 0x10) >> 1));

					if ((data & 0x08) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
					else SetVRAM_Mirror(VRAM_VMIRROR);

					break;
			}
		}

		//void Mapper057::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			p[0] = reg;
		}

		//void Mapper057::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			reg = p[0];
		}


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