/////////////////////////////
// Mapper083  Cony                                                      //
//////////////////////////////////////////////////////////////////////////
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 Mapper083 : Mapper
	{
		BYTE[] reg = new byte[3];
		INT chr_bank;
		BYTE irq_enable;
		INT irq_counter;

		BYTE patch;
		public Mapper083(NES parent) : base(parent)
		{
		}

		public override void Reset()

		{
			for (INT i = 0; i < 3; i++)
			{
				reg[i] = 0x00;
			}

			if (PROM_8K_SIZE >= 32)
			{
				SetPROM_32K_Bank(0, 1, 30, 31);
				reg[1] = 0x30;
			}
			else
			{
				SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
			}

			if (VROM_1K_SIZE != 0)
			{
				SetVROM_8K_Bank(0);
			}

			chr_bank = 0;

			irq_enable = 0; // Disable
			irq_counter = 0;

			patch = 0;
			if (nes.rom.GetPROM_CRC() == 0x1461D1F8)
			{
				patch = 1;
			}
		}

		//BYTE Mapper083::ReadLow(WORD addr)
		public override byte ReadLow(ushort addr)
		{
			if ((addr & 0x5100) == 0x5100)
			{
				return reg[2];
			}
			else if (addr >= 0x6000)
			{
				return base.ReadLow(addr);
			}
			return (BYTE)(addr >> 8);
		}

		//void Mapper083::WriteLow(WORD addr, BYTE data)
		public override void WriteLow(ushort addr, byte data)
		{
			//DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes.GetScanline(), nes.cpu.GetTotalCycles() );
			switch (addr)
			{
				case 0x5101:
				case 0x5102:
				case 0x5103:
					reg[2] = data;
					break;
			}

			if (addr >= 0x6000)
			{
				base.WriteLow(addr, data);
			}
		}

		//void Mapper083::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			//DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes.GetScanline(), nes.cpu.GetTotalCycles() );
			switch (addr)
			{
				case 0x8000:
				case 0xB000:
				case 0xB0FF:
				case 0xB1FF:
					reg[0] = data;
					chr_bank = (data & 0x30) << 4;
					SetPROM_16K_Bank(4, data);
					SetPROM_16K_Bank(6, (data & 0x30) | 0x0F);
					break;

				case 0x8100:
					reg[1] = (byte)(data & 0x80);
					data &= 0x03;
					if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR);
					else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR);
					else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L);
					else SetVRAM_Mirror(VRAM_MIRROR4H);
					break;

				case 0x8200:
					irq_counter = (irq_counter & 0xFF00) | (INT)data;
					//			nes.cpu.ClrIRQ( IRQ_MAPPER );
					break;
				case 0x8201:
					irq_counter = (irq_counter & 0x00FF) | ((INT)data << 8);
					irq_enable = reg[1];
					//			nes.cpu.ClrIRQ( IRQ_MAPPER );
					break;

				case 0x8300:
					SetPROM_8K_Bank(4, data);
					break;
				case 0x8301:
					SetPROM_8K_Bank(5, data);
					break;
				case 0x8302:
					SetPROM_8K_Bank(6, data);
					break;

				case 0x8310:
					if (patch != 0)
					{
						SetVROM_2K_Bank(0, chr_bank | data);
					}
					else
					{
						SetVROM_1K_Bank(0, chr_bank | data);
					}
					break;
				case 0x8311:
					if (patch != 0)
					{
						SetVROM_2K_Bank(2, chr_bank | data);
					}
					else
					{
						SetVROM_1K_Bank(1, chr_bank | data);
					}
					break;
				case 0x8312:
					SetVROM_1K_Bank(2, chr_bank | data);
					break;
				case 0x8313:
					SetVROM_1K_Bank(3, chr_bank | data);
					break;
				case 0x8314:
					SetVROM_1K_Bank(4, chr_bank | data);
					break;
				case 0x8315:
					SetVROM_1K_Bank(5, chr_bank | data);
					break;
				case 0x8316:
					if (patch != 0)
					{
						SetVROM_2K_Bank(4, chr_bank | data);
					}
					else
					{
						SetVROM_1K_Bank(6, chr_bank | data);
					}
					break;
				case 0x8317:
					if (patch != 0)
					{
						SetVROM_2K_Bank(6, chr_bank | data);
					}
					else
					{
						SetVROM_1K_Bank(7, chr_bank | data);
					}
					break;

				case 0x8318:
					SetPROM_16K_Bank(4, (reg[0] & 0x30) | data);
					break;
			}
		}

		//void Mapper083::HSync(INT scanline)
		public override void HSync(int scanline)
		{
			if (irq_enable != 0)
			{
				if (irq_counter <= 113)
				{
					//			nes.cpu.IRQ();
					irq_enable = 0;
					//			nes.cpu.SetIRQ( IRQ_MAPPER );
					nes.cpu.SetIRQ(IRQ_TRIGGER);
				}
				else
				{
					irq_counter -= 113;
				}
			}
		}

		//void Mapper083::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			//p[0] = reg[0];
			//p[1] = reg[1];
			//p[2] = reg[2];
			//*(INT*)&p[3] = chr_bank;
			//p[7] = irq_enable;
			//*(INT*)&p[8] = irq_counter;
		}

		//void Mapper083::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			//reg[0] = p[0];
			//reg[1] = p[1];
			//reg[2] = p[2];
			//chr_bank = *(INT*)&p[3];
			//irq_enable = p[7];
			//irq_counter = *(INT*)&p[8];
		}

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