//////////////////////////////////////////////////////////////////////////
// Mapper069  SunSoft FME-7                                             //
//////////////////////////////////////////////////////////////////////////
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 Mapper069 : Mapper
	{
		BYTE patch;

		BYTE reg;
		BYTE irq_enable;
		INT irq_counter;
		public Mapper069(NES parent) : base(parent)
		{
		}

		public override void Reset()

		{
			reg = 0;
			irq_enable = 0;
			irq_counter = 0;

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

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

			nes.apu.SelectExSound(32);
			nes.SetIrqType(NES.IRQMETHOD.IRQ_CLOCK);
			patch = 0;

			uint crc = nes.rom.GetPROM_CRC();

			if (crc == 0xfeac6916)
			{   // Honoo no Toukyuuji - Dodge Danpei 2(J)
				//		nes.SetIrqType( NES::IRQ_HSYNC );
				nes.SetRenderMethod(EnumRenderMethod.TILE_RENDER);
			}

			if (crc == 0xad28aef6)
			{   // Dynamite Batman(J) / Dynamite Batman - Return of the Joker(U)
				patch = 1;
			}
		}

		//void Mapper069::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			switch (addr & 0xE000)
			{
				case 0x8000:
					reg = data;
					break;

				case 0xA000:
					switch (reg & 0x0F)
					{
						case 0x00:
						case 0x01:
						case 0x02:
						case 0x03:
						case 0x04:
						case 0x05:
						case 0x06:
						case 0x07:
							SetVROM_1K_Bank((byte)(reg & 0x07), data);
							break;
						case 0x08:
							if (patch == 0 && (data & 0x40) == 0)
							{
								SetPROM_8K_Bank(3, data);
							}
							break;
						case 0x09:
							SetPROM_8K_Bank(4, data);
							break;
						case 0x0A:
							SetPROM_8K_Bank(5, data);
							break;
						case 0x0B:
							SetPROM_8K_Bank(6, data);
							break;

						case 0x0C:
							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 0x0D:
							irq_enable = data;
							nes.cpu.ClrIRQ(IRQ_MAPPER);
							break;

						case 0x0E:
							irq_counter = (irq_counter & 0xFF00) | data;
							nes.cpu.ClrIRQ(IRQ_MAPPER);
							break;

						case 0x0F:
							irq_counter = (irq_counter & 0x00FF) | (data << 8);
							nes.cpu.ClrIRQ(IRQ_MAPPER);
							break;
					}
					break;

				case 0xC000:
				case 0xE000:
					nes.apu.ExWrite(addr, data);
					break;
			}
		}

		//void Mapper069::Clock(INT cycles)
		public override void Clock(int cycles)
		{
			//if (irq_enable && (nes.GetIrqType() == NES::IRQ_CLOCK))
			if (irq_enable != 0 && (nes.GetIrqType() == (int)NES.IRQMETHOD.IRQ_HSYNC))
			{
				irq_counter -= cycles;
				if (irq_counter <= 0)
				{
					nes.cpu.SetIRQ(IRQ_MAPPER);
					irq_enable = 0;
					irq_counter = 0xFFFF;
				}
			}
		}

		//void Mapper069::HSync(INT scanline)
		public override void HSync(int scanline)
		{
			if (irq_enable != 0 && (nes.GetIrqType() == (int)NES.IRQMETHOD.IRQ_HSYNC))
			{
				irq_counter -= 114;
				if (irq_counter <= 0)
				{
					nes.cpu.SetIRQ(IRQ_MAPPER);
					irq_enable = 0;
					irq_counter = 0xFFFF;
				}
			}
		}

		//void Mapper069::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			//p[0] = reg;
			//p[1] = irq_enable;
			//*(INT*)&p[2] = irq_counter;
		}

		//void Mapper069::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			//reg = p[0];
			//irq_enable = p[1];
			//irq_counter = *(INT*)&p[2];
		}
		public override bool IsStateSave()
		{
			return true;
		}
	}
}