//////////////////////////////////////////////////////////////////////////
// Mapper018  Jaleco SS8806                                             //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
//using Codice.CM.Client.Differences;

namespace VirtualNes.Core
{
	public class Mapper018 : Mapper
	{
		BYTE[] reg = new byte[11];

		BYTE irq_enable;
		BYTE irq_mode;
		INT irq_latch;
		INT irq_counter;
		public Mapper018(NES parent) : base(parent)
		{
		}


		public override void Reset()
		{
			for (INT i = 0; i < 11; i++)
			{
				reg[i] = 0;
			}
			reg[2] = (byte)(PROM_8K_SIZE - 2);
			reg[3] = (byte)(PROM_8K_SIZE - 1);

			SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);

			irq_enable = 0;
			irq_mode = 0;
			irq_counter = 0xFFFF;
			irq_latch = 0xFFFF;

			uint crc = nes.rom.GetPROM_CRC();

			if (crc == 0xefb1df9e)
			{   // The Lord of King(J)
				nes.SetRenderMethod(EnumRenderMethod.PRE_ALL_RENDER);
			}
			if (crc == 0x3746f951)
			{   // Pizza Pop!(J)
				nes.SetRenderMethod(EnumRenderMethod.PRE_ALL_RENDER);
			}

			//	nes.SetRenderMethod( NES::PRE_ALL_RENDER );
			//	nes.SetRenderMethod( NES::POST_ALL_RENDER );
		}

		//void Mapper018::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			switch (addr)
			{
				case 0x8000:
					reg[0] = (byte)((reg[0] & 0xF0) | (data & 0x0F));
					SetPROM_8K_Bank(4, reg[0]);
					break;
				case 0x8001:
					reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x0F) << 4));
					SetPROM_8K_Bank(4, reg[0]);
					break;
				case 0x8002:
					reg[1] = (byte)((reg[1] & 0xF0) | (data & 0x0F));
					SetPROM_8K_Bank(5, reg[1]);
					break;
				case 0x8003:
					reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x0F) << 4));
					SetPROM_8K_Bank(5, reg[1]);
					break;
				case 0x9000:
					reg[2] = (byte)((reg[2] & 0xF0) | (data & 0x0F));
					SetPROM_8K_Bank(6, reg[2]);
					break;
				case 0x9001:
					reg[2] = (byte)((reg[2] & 0x0F) | ((data & 0x0F) << 4));
					SetPROM_8K_Bank(6, reg[2]);
					break;

				case 0xA000:
					reg[3] = (byte)((reg[3] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(0, reg[3]);
					break;
				case 0xA001:
					reg[3] = (byte)((reg[3] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(0, reg[3]);
					break;
				case 0xA002:
					reg[4] = (byte)((reg[4] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(1, reg[4]);
					break;
				case 0xA003:
					reg[4] = (byte)((reg[4] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(1, reg[4]);
					break;

				case 0xB000:
					reg[5] = (byte)((reg[5] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(2, reg[5]);
					break;
				case 0xB001:
					reg[5] = (byte)((reg[5] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(2, reg[5]);
					break;
				case 0xB002:
					reg[6] = (byte)((reg[6] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(3, reg[6]);
					break;
				case 0xB003:
					reg[6] = (byte)((reg[6] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(3, reg[6]);
					break;

				case 0xC000:
					reg[7] = (byte)((reg[7] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(4, reg[7]);
					break;
				case 0xC001:
					reg[7] = (byte)((reg[7] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(4, reg[7]);
					break;
				case 0xC002:
					reg[8] = (byte)((reg[8] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(5, reg[8]);
					break;
				case 0xC003:
					reg[8] = (byte)((reg[8] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(5, reg[8]);
					break;

				case 0xD000:
					reg[9] = (byte)((reg[9] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(6, reg[9]);
					break;
				case 0xD001:
					reg[9] = (byte)((reg[9] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(6, reg[9]);
					break;
				case 0xD002:
					reg[10] = (byte)((reg[10] & 0xF0) | (data & 0x0F));
					SetVROM_1K_Bank(7, reg[10]);
					break;
				case 0xD003:
					reg[10] = (byte)((reg[10] & 0x0F) | ((data & 0x0F) << 4));
					SetVROM_1K_Bank(7, reg[10]);
					break;

				case 0xE000:
					irq_latch = (irq_latch & 0xFFF0) | (data & 0x0F);
					break;
				case 0xE001:
					irq_latch = (irq_latch & 0xFF0F) | ((data & 0x0F) << 4);
					break;
				case 0xE002:
					irq_latch = (irq_latch & 0xF0FF) | ((data & 0x0F) << 8);
					break;
				case 0xE003:
					irq_latch = (irq_latch & 0x0FFF) | ((data & 0x0F) << 12);
					break;

				case 0xF000:
					//			if( data & 0x01 ) {
					irq_counter = irq_latch;
					//			} else {
					//				irq_counter = 0;
					//			}
					break;
				case 0xF001:
					irq_mode = (byte)((data >> 1) & 0x07);
					irq_enable = ((byte)(data & 0x01));
					//			if( !irq_enable ) {
					nes.cpu.ClrIRQ(IRQ_MAPPER);
					//			}
					break;

				case 0xF002:
					data &= 0x03;
					if (data == 0) SetVRAM_Mirror(VRAM_HMIRROR);
					else if (data == 1) SetVRAM_Mirror(VRAM_VMIRROR);
					else SetVRAM_Mirror(VRAM_MIRROR4L);
					break;
			}
		}

		//void Mapper018::Clock(INT cycles)
		public override void Clock(int cycles)
		{
			bool bIRQ = false;
			INT irq_counter_old = irq_counter;

			if (irq_enable != 0 && irq_counter != 0)
			{
				irq_counter -= cycles;

				switch (irq_mode)
				{
					case 0:
						if (irq_counter <= 0)
						{
							bIRQ = true;
						}
						break;
					case 1:
						if ((irq_counter & 0xF000) != (irq_counter_old & 0xF000))
						{
							bIRQ = true;
						}
						break;
					case 2:
					case 3:
						if ((irq_counter & 0xFF00) != (irq_counter_old & 0xFF00))
						{
							bIRQ = true;
						}
						break;
					case 4:
					case 5:
					case 6:
					case 7:
						if ((irq_counter & 0xFFF0) != (irq_counter_old & 0xFFF0))
						{
							bIRQ = true;
						}
						break;
				}

				if (bIRQ)
				{
					////			irq_enable = 0;
					//			irq_counter = irq_latch;
					irq_counter = 0;
					irq_enable = 0;
					//			nes.cpu.IRQ_NotPending();
					nes.cpu.SetIRQ(IRQ_MAPPER);
				}
			}
		}

		//void Mapper018::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			//for (INT i = 0; i < 11; i++)
			//{
			//	p[i] = reg[i];
			//}
			//p[11] = irq_enable;
			//p[12] = irq_mode;
			//*(INT*)&p[13] = irq_counter;
			//*(INT*)&p[17] = irq_latch;
		}

		//void Mapper018::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			//for (INT i = 0; i < 11; i++)
			//{
			//	p[i] = reg[i];
			//}
			//irq_enable = p[11];
			//irq_mode = p[12];
			//irq_counter = *(INT*)&p[13];
			//irq_latch = *(INT*)&p[17];
		}


		public override bool IsStateSave()
		{
			return true;
		}

	}
}