//////////////////////////////////////////////////////////////////////////
// Mapper095  Namcot 106M (Dragon Buster)                               //
//////////////////////////////////////////////////////////////////////////
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 Mapper095 : Mapper
	{
		BYTE reg;
		BYTE prg0, prg1;
		BYTE chr01, chr23, chr4, chr5, chr6, chr7;
		public Mapper095(NES parent) : base(parent)
		{
		}

		public override void Reset()
		{
			reg = 0x00;
			prg0 = 0;
			prg1 = 1;
			SetBank_CPU();

			if (VROM_1K_SIZE != 0)
			{
				chr01 = 0;
				chr23 = 2;
				chr4 = 4;
				chr5 = 5;
				chr6 = 6;
				chr7 = 7;
			}
			else
			{
				chr01 = chr23 = chr4 = chr5 = chr6 = chr7 = 0;
			}

			SetBank_PPU();

			nes.SetRenderMethod(EnumRenderMethod.POST_RENDER);
		}

		//void Mapper095::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			switch (addr & 0xE001)
			{
				case 0x8000:
					reg = data;
					SetBank_CPU();
					SetBank_PPU();
					break;
				case 0x8001:
					if (reg <= 0x05)
					{
						if ((data & 0x20) != 0) SetVRAM_Mirror(VRAM_MIRROR4H);
						else SetVRAM_Mirror(VRAM_MIRROR4L);
						data &= 0x1F;
					}

					switch (reg & 0x07)
					{
						case 0x00:
							if (VROM_1K_SIZE != 0)
							{
								chr01 = (byte)(data & 0xFE);
								SetBank_PPU();
							}
							break;
						case 0x01:
							if (VROM_1K_SIZE != 0)
							{
								chr23 = (byte)(data & 0xFE);
								SetBank_PPU();
							}
							break;
						case 0x02:
							if (VROM_1K_SIZE != 0)
							{
								chr4 = data;
								SetBank_PPU();
							}
							break;
						case 0x03:
							if (VROM_1K_SIZE != 0)
							{
								chr5 = data;
								SetBank_PPU();
							}
							break;
						case 0x04:
							if (VROM_1K_SIZE != 0)
							{
								chr6 = data;
								SetBank_PPU();
							}
							break;
						case 0x05:
							if (VROM_1K_SIZE != 0)
							{
								chr7 = data;
								SetBank_PPU();
							}
							break;
						case 0x06:
							prg0 = data;
							SetBank_CPU();
							break;
						case 0x07:
							prg1 = data;
							SetBank_CPU();
							break;
					}
					break;
			}
		}

		void SetBank_CPU()
		{
			if ((reg & 0x40) != 0)
			{
				SetPROM_32K_Bank(PROM_8K_SIZE - 2, prg1, prg0, PROM_8K_SIZE - 1);
			}
			else
			{
				SetPROM_32K_Bank(prg0, prg1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
			}
		}

		void SetBank_PPU()
		{
			if (VROM_1K_SIZE != 0)
			{
				if ((reg & 0x80) != 0)
				{
					SetVROM_8K_Bank(chr4, chr5, chr6, chr7,
							 chr01, chr01 + 1, chr23, chr23 + 1);
				}
				else
				{
					SetVROM_8K_Bank(chr01, chr01 + 1, chr23, chr23 + 1,
							 chr4, chr5, chr6, chr7);
				}
			}
		}

		//void Mapper095::SaveState(LPBYTE p)
		public override void SaveState(byte[] p)
		{
			p[0] = reg;
			p[1] = prg0;
			p[2] = prg1;
			p[3] = chr01;
			p[4] = chr23;
			p[5] = chr4;
			p[6] = chr5;
			p[7] = chr6;
			p[8] = chr7;
		}

		//void Mapper095::LoadState(LPBYTE p)
		public override void LoadState(byte[] p)
		{
			reg = p[0];
			prg0 = p[1];
			prg1 = p[2];
			chr01 = p[3];
			chr23 = p[4];
			chr4 = p[5];
			chr5 = p[6];
			chr6 = p[7];
			chr7 = p[8];
		}


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