using System.IO;

namespace MyNes.Core;

[BoardInfo("Unknown", 255)]
[HassIssues]
internal class Mapper255 : Board
{
	private byte[] RAM;

	internal override string Issues => MNInterfaceLanguage.IssueMapper255;

	internal override void HardReset()
	{
		base.HardReset();
		RAM = new byte[4];
	}

	internal override void WriteEX(ref ushort address, ref byte data)
	{
		if (address >= 22528)
		{
			RAM[address & 3] = (byte)(data & 0xFu);
		}
	}

	internal override void ReadEX(ref ushort address, out byte data)
	{
		if (address >= 22528)
		{
			data = RAM[address & 3];
		}
		else
		{
			data = 0;
		}
	}

	internal override void WritePRG(ref ushort address, ref byte data)
	{
		Switch08KCHR(address & 0x3F);
		if ((address & 0x1000) == 4096)
		{
			Switch16KPRG((address >> 6) & 0x3F, PRGArea.Area8000);
			Switch16KPRG((address >> 6) & 0x3F, PRGArea.AreaC000);
		}
		else
		{
			Switch32KPRG(((address >> 6) & 0x3F) >> 1, PRGArea.Area8000);
		}
		Switch01KNMTFromMirroring(((address & 0x2000) == 8192) ? Mirroring.Horz : Mirroring.Vert);
	}

	internal override void WriteStateData(ref BinaryWriter stream)
	{
		base.WriteStateData(ref stream);
		stream.Write(RAM);
	}

	internal override void ReadStateData(ref BinaryReader stream)
	{
		base.ReadStateData(ref stream);
		stream.Read(RAM, 0, RAM.Length);
	}
}