using System.IO;

namespace MyNes.Core;

[BoardInfo("VRC2", 22)]
internal class Mapper022 : Board
{
	private int[] chr_Reg;

	internal override void HardReset()
	{
		base.HardReset();
		Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
		chr_Reg = new int[8];
	}

	internal override void WritePRG(ref ushort address, ref byte data)
	{
		switch (address)
		{
		case 32768:
		case 32769:
		case 32770:
		case 32771:
			Switch08KPRG(data & 0xF, PRGArea.Area8000);
			break;
		case 36864:
		case 36865:
		case 36866:
		case 36867:
			switch (data & 3)
			{
			case 0:
				Switch01KNMTFromMirroring(Mirroring.Vert);
				break;
			case 1:
				Switch01KNMTFromMirroring(Mirroring.Horz);
				break;
			case 2:
				Switch01KNMTFromMirroring(Mirroring.OneScA);
				break;
			case 3:
				Switch01KNMTFromMirroring(Mirroring.OneScB);
				break;
			}
			break;
		case 40960:
		case 40961:
		case 40962:
		case 40963:
			Switch08KPRG(data & 0xF, PRGArea.AreaA000);
			break;
		case 45056:
			chr_Reg[0] = (chr_Reg[0] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[0] >> 1, CHRArea.Area0000);
			break;
		case 45058:
			chr_Reg[0] = (chr_Reg[0] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[0] >> 1, CHRArea.Area0000);
			break;
		case 45057:
			chr_Reg[1] = (chr_Reg[1] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[1] >> 1, CHRArea.Area0400);
			break;
		case 45059:
			chr_Reg[1] = (chr_Reg[1] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[1] >> 1, CHRArea.Area0400);
			break;
		case 49152:
			chr_Reg[2] = (chr_Reg[2] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[2] >> 1, CHRArea.Area0800);
			break;
		case 49154:
			chr_Reg[2] = (chr_Reg[2] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[2] >> 1, CHRArea.Area0800);
			break;
		case 49153:
			chr_Reg[3] = (chr_Reg[3] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[3] >> 1, CHRArea.Area0C00);
			break;
		case 49155:
			chr_Reg[3] = (chr_Reg[3] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[3] >> 1, CHRArea.Area0C00);
			break;
		case 53248:
			chr_Reg[4] = (chr_Reg[4] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[4] >> 1, CHRArea.Area1000);
			break;
		case 53250:
			chr_Reg[4] = (chr_Reg[4] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[4] >> 1, CHRArea.Area1000);
			break;
		case 53249:
			chr_Reg[5] = (chr_Reg[5] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[5] >> 1, CHRArea.Area1400);
			break;
		case 53251:
			chr_Reg[5] = (chr_Reg[5] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[5] >> 1, CHRArea.Area1400);
			break;
		case 57344:
			chr_Reg[6] = (chr_Reg[6] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[6] >> 1, CHRArea.Area1800);
			break;
		case 57346:
			chr_Reg[6] = (chr_Reg[6] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[6] >> 1, CHRArea.Area1800);
			break;
		case 57345:
			chr_Reg[7] = (chr_Reg[7] & 0xF0) | (data & 0xF);
			Switch01KCHR(chr_Reg[7] >> 1, CHRArea.Area1C00);
			break;
		case 57347:
			chr_Reg[7] = (chr_Reg[7] & 0xF) | ((data & 0xF) << 4);
			Switch01KCHR(chr_Reg[7] >> 1, CHRArea.Area1C00);
			break;
		}
	}

	internal override void WriteStateData(ref BinaryWriter stream)
	{
		base.WriteStateData(ref stream);
		for (int i = 0; i < chr_Reg.Length; i++)
		{
			stream.Write(chr_Reg[i]);
		}
	}

	internal override void ReadStateData(ref BinaryReader stream)
	{
		base.ReadStateData(ref stream);
		for (int i = 0; i < chr_Reg.Length; i++)
		{
			chr_Reg[i] = stream.ReadInt32();
		}
	}
}