using System.IO;

namespace MyNes.Core;

[BoardInfo("Unknown", 227)]
internal class Mapper227 : Board
{
	private bool flag_o;

	private bool flag_s;

	private bool flag_l;

	private int prg_reg;

	internal override void HardReset()
	{
		base.HardReset();
		Switch16KPRG(0, PRGArea.AreaC000);
		flag_o = false;
		flag_s = false;
		flag_l = false;
		prg_reg = 0;
		ToggleCHRRAMWritableEnable(enable: true);
	}

	internal override void WritePRG(ref ushort address, ref byte data)
	{
		flag_s = (address & 1) == 1;
		flag_o = (address & 0x80) == 128;
		flag_l = (address & 0x200) == 512;
		prg_reg = ((address >> 2) & 0x1F) | ((address >> 3) & 0x20);
		Switch01KNMTFromMirroring(((address & 2) == 2) ? Mirroring.Horz : Mirroring.Vert);
		ToggleCHRRAMWritableEnable(!flag_o);
		if (flag_o)
		{
			if (!flag_s)
			{
				Switch16KPRG(prg_reg, PRGArea.Area8000);
				Switch16KPRG(prg_reg, PRGArea.AreaC000);
			}
			else
			{
				Switch32KPRG(prg_reg >> 1, PRGArea.Area8000);
			}
		}
		else if (!flag_l)
		{
			if (!flag_s)
			{
				Switch16KPRG(prg_reg, PRGArea.Area8000);
				Switch16KPRG(prg_reg & 0x38, PRGArea.AreaC000);
			}
			else
			{
				Switch16KPRG(prg_reg & 0x3E, PRGArea.Area8000);
				Switch16KPRG(prg_reg & 0x38, PRGArea.AreaC000);
			}
		}
		else if (!flag_s)
		{
			Switch16KPRG(prg_reg, PRGArea.Area8000);
			Switch16KPRG(prg_reg | 7, PRGArea.AreaC000);
		}
		else
		{
			Switch16KPRG(prg_reg & 0x3E, PRGArea.Area8000);
			Switch16KPRG(prg_reg | 7, PRGArea.AreaC000);
		}
	}

	internal override void WriteStateData(ref BinaryWriter stream)
	{
		base.WriteStateData(ref stream);
		stream.Write(flag_o);
		stream.Write(flag_s);
		stream.Write(flag_l);
		stream.Write(prg_reg);
	}

	internal override void ReadStateData(ref BinaryReader stream)
	{
		base.ReadStateData(ref stream);
		flag_o = stream.ReadBoolean();
		flag_s = stream.ReadBoolean();
		flag_l = stream.ReadBoolean();
		prg_reg = stream.ReadInt32();
	}
}