using System.IO;

namespace MyNes.Core;

[BoardInfo("Taito TC0190/TC0350", 48, true, true)]
internal class Mapper048 : Board
{
	private bool MODE;

	private bool irq_enabled;

	private byte irq_counter;

	private int old_irq_counter;

	private byte irq_reload;

	private bool irq_clear;

	private bool mmc3_alt_behavior;

	internal override void HardReset()
	{
		base.HardReset();
		Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
		MODE = false;
		if (IsGameFoundOnDB)
		{
			foreach (string chip in base.Chips)
			{
				if (chip.Contains("TC0350"))
				{
					MODE = true;
					break;
				}
			}
		}
		irq_enabled = false;
		irq_counter = 0;
		irq_reload = byte.MaxValue;
		old_irq_counter = 0;
		mmc3_alt_behavior = false;
		irq_clear = false;
	}

	internal override void WritePRG(ref ushort address, ref byte data)
	{
		if (!MODE)
		{
			switch (address & 0xE003)
			{
			case 32768:
				Switch08KPRG(data, PRGArea.Area8000);
				break;
			case 32769:
				Switch08KPRG(data, PRGArea.AreaA000);
				break;
			case 32770:
				Switch02KCHR(data, CHRArea.Area0000);
				break;
			case 32771:
				Switch02KCHR(data, CHRArea.Area0800);
				break;
			case 40960:
				Switch01KCHR(data, CHRArea.Area1000);
				break;
			case 40961:
				Switch01KCHR(data, CHRArea.Area1400);
				break;
			case 40962:
				Switch01KCHR(data, CHRArea.Area1800);
				break;
			case 40963:
				Switch01KCHR(data, CHRArea.Area1C00);
				break;
			case 49152:
				irq_reload = (byte)(data ^ 0xFFu);
				break;
			case 49153:
				if (mmc3_alt_behavior)
				{
					irq_clear = true;
				}
				irq_counter = 0;
				break;
			case 49154:
				irq_enabled = false;
				NesEmu.IRQFlags &= -9;
				break;
			case 49155:
				irq_enabled = true;
				break;
			case 57344:
				Switch01KNMTFromMirroring(((data & 0x40) == 64) ? Mirroring.Horz : Mirroring.Vert);
				break;
			}
		}
		else
		{
			switch (address & 0xA003)
			{
			case 32768:
				Switch01KNMTFromMirroring(((data & 0x40) == 64) ? Mirroring.Horz : Mirroring.Vert);
				Switch08KPRG(data & 0x3F, PRGArea.Area8000);
				break;
			case 32769:
				Switch08KPRG(data & 0x3F, PRGArea.AreaA000);
				break;
			case 32770:
				Switch02KCHR(data, CHRArea.Area0000);
				break;
			case 32771:
				Switch02KCHR(data, CHRArea.Area0800);
				break;
			case 40960:
				Switch01KCHR(data, CHRArea.Area1000);
				break;
			case 40961:
				Switch01KCHR(data, CHRArea.Area1400);
				break;
			case 40962:
				Switch01KCHR(data, CHRArea.Area1800);
				break;
			case 40963:
				Switch01KCHR(data, CHRArea.Area1C00);
				break;
			}
		}
	}

	internal override void OnPPUA12RaisingEdge()
	{
		if (!MODE)
		{
			old_irq_counter = irq_counter;
			if (irq_counter == 0 || irq_clear)
			{
				irq_counter = irq_reload;
			}
			else
			{
				irq_counter--;
			}
			if ((!mmc3_alt_behavior || old_irq_counter != 0 || irq_clear) && irq_counter == 0 && irq_enabled)
			{
				NesEmu.IRQFlags |= 8;
			}
			irq_clear = false;
		}
	}

	internal override void WriteStateData(ref BinaryWriter stream)
	{
		base.WriteStateData(ref stream);
		stream.Write(irq_enabled);
		stream.Write(irq_counter);
		stream.Write(old_irq_counter);
		stream.Write(irq_reload);
		stream.Write(irq_clear);
	}

	internal override void ReadStateData(ref BinaryReader stream)
	{
		base.ReadStateData(ref stream);
		irq_enabled = stream.ReadBoolean();
		irq_counter = stream.ReadByte();
		old_irq_counter = stream.ReadInt32();
		irq_reload = stream.ReadByte();
		irq_clear = stream.ReadBoolean();
	}
}