//////////////////////////////////////////////////////////////////////////
// Mapper085  Konami VRC7                                               //
//////////////////////////////////////////////////////////////////////////
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 Mapper085 : Mapper
	{

		BYTE irq_enable;
		BYTE irq_counter;
		BYTE irq_latch;
		INT irq_clock;
		public Mapper085(NES parent) : base(parent)
		{
		}

		public override void Reset()

		{
			irq_enable = 0;
			irq_counter = 0;
			irq_latch = 0;
			irq_clock = 0;

			SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
			if (VROM_1K_SIZE != 0)
			{
				SetVROM_8K_Bank(0);
			}
			else
			{
				SetCRAM_8K_Bank(0);
			}

#if FALSE//0
//	DWORD	crc = nes.rom.GetPROM_CRC();
//	if( crc == 0x1aa0479c ) {	// For Tiny Toon Adventures 2 - Montana Land he Youkoso(J)
//		nes.SetRenderMethod( NES::PRE_RENDER );
//	}
//	if( crc == 0x33ce3ff0 ) {	// For Lagrange Point(J)
//		nes.SetRenderMethod( NES::TILE_RENDER );
//	}
#endif
			nes.apu.SelectExSound(2);
		}

		//void Mapper085::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			switch (addr & 0xF038)
			{
				case 0x8000:
					SetPROM_8K_Bank(4, data);
					break;
				case 0x8008:
				case 0x8010:
					SetPROM_8K_Bank(5, data);
					break;
				case 0x9000:
					SetPROM_8K_Bank(6, data);
					break;

				case 0x9010:
				case 0x9030:
					nes.apu.ExWrite(addr, data);
					break;

				case 0xA000:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(0, data);
					}
					else
					{
						SetCRAM_1K_Bank(0, data);
					}
					break;

				case 0xA008:
				case 0xA010:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(1, data);
					}
					else
					{
						SetCRAM_1K_Bank(1, data);
					}
					break;

				case 0xB000:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(2, data);
					}
					else
					{
						SetCRAM_1K_Bank(2, data);
					}
					break;

				case 0xB008:
				case 0xB010:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(3, data);
					}
					else
					{
						SetCRAM_1K_Bank(3, data);
					}
					break;

				case 0xC000:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(4, data);
					}
					else
					{
						SetCRAM_1K_Bank(4, data);
					}
					break;

				case 0xC008:
				case 0xC010:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(5, data);
					}
					else
					{
						SetCRAM_1K_Bank(5, data);
					}
					break;

				case 0xD000:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(6, data);
					}
					else
					{
						SetCRAM_1K_Bank(6, data);
					}
					break;

				case 0xD008:
				case 0xD010:
					if (VROM_1K_SIZE != 0)
					{
						SetVROM_1K_Bank(7, data);
					}
					else
					{
						SetCRAM_1K_Bank(7, data);
					}
					break;

				case 0xE000:
					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 0xE008:
				case 0xE010:
					irq_latch = data;
					break;

				case 0xF000:
					irq_enable = (byte)(data & 0x03);
					irq_counter = irq_latch;
					irq_clock = 0;
					nes.cpu.ClrIRQ(IRQ_MAPPER);
					break;

				case 0xF008:
				case 0xF010:
					irq_enable = (byte)((irq_enable & 0x01) * 3);
					nes.cpu.ClrIRQ(IRQ_MAPPER);
					break;
			}
		}

		//void Mapper085::Clock(INT cycles)
		public override void Clock(int cycles)
		{
			if ((irq_enable & 0x02) != 0)
			{
				irq_clock += cycles * 4;
				while (irq_clock >= 455)
				{
					irq_clock -= 455;
					irq_counter++;
					if (irq_counter == 0)
					{
						irq_counter = irq_latch;
						nes.cpu.SetIRQ(IRQ_MAPPER);
					}
				}
			}
		}

		//void Mapper085::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			//p[0] = irq_enable;
			//p[1] = irq_counter;
			//p[2] = irq_latch;
			//*((INT*)&p[4]) = irq_clock;
		}

		//void Mapper085::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			//irq_enable = p[0];
			//irq_counter = p[1];
			//irq_latch = p[2];
			//irq_clock = *((INT*)&p[4]);
		}

		public override bool IsStateSave()
		{
			return true;
		}

	}
}