using System;
using System.IO;
using System.Diagnostics;

namespace BizHawk.Emulation.Consoles.Nintendo
{
	//AKA mapper 80

	//Minelvaton Saga
	//Taito Grand Prix - Eikou heno License
	//Kyuukyoku Harikiri Stadium

	/*
	* Registers:
	---------------------------

	$7EF0-7EF5:  CHR Regs

	$7EF6:  [.... ...M]  Mirroring
	0 = Horz
	1 = Vert

	$7EFA,7EFB:  PRG Reg 0 (8k @ $8000)
	$7EFC,7EFD:  PRG Reg 1 (8k @ $A000)
	$7EFE,7EFF:  PRG Reg 2 (8k @ $C000)


	CHR Setup:
	---------------------------

	$0000   $0400   $0800   $0C00   $1000   $1400   $1800   $1C00 
	+---------------+---------------+-------+-------+-------+-------+
	|    <$7EF0>    |    <$7EF1>    | $7EF2 | $7EF3 | $7EF4 | $7EF5 |
	+---------------+---------------+-------+-------+-------+-------+

	PRG Setup:
	---------------------------

	$8000   $A000   $C000   $E000  
	+-------+-------+-------+-------+
	| $7EFA | $7EFC | $7EFE | { -1} |
	+-------+-------+-------+-------+
	*/

	class TAITO_X1_005 : NES.NESBoardBase
	{
		int prg_bank_mask, chr_bank_mask;
		ByteBuffer chr_regs_1k = new ByteBuffer(8);
		ByteBuffer prg_regs_8k = new ByteBuffer(4);

		public override void SyncState(Serializer ser)
		{
			base.SyncState(ser);
			ser.Sync("chr_regs_1k", ref chr_regs_1k);
			ser.Sync("prg_regs_8k", ref prg_regs_8k);
		}

		public override void Dispose()
		{
			base.Dispose();
			chr_regs_1k.Dispose();
			prg_regs_8k.Dispose();
		}

		public override bool Configure(NES.EDetectionOrigin origin)
		{
			//configure
			switch (Cart.board_type)
			{
				case "MAPPER080":
					break;
				case "TAITO-X1-005":
					if (Cart.mapper == 207)
					{
						return false;
					}
					break;
				default:
					return false;
			}

			SetMirrorType(EMirrorType.Vertical);
			chr_bank_mask = Cart.chr_size / 1 - 1;
			prg_bank_mask = Cart.prg_size / 8 - 1;
			prg_regs_8k[3] = 0xFF;
			return true;
		}

		public override void WriteWRAM(int addr, byte value)
		{
			switch (addr)
			{
				case 0x1EF6:
					if (value.Bit(0))
						SetMirrorType(EMirrorType.Vertical);
					else
						SetMirrorType(EMirrorType.Horizontal);
					break;

				case 0x1EF0:
					chr_regs_1k[0] = (byte)(value/2*2);
					chr_regs_1k[1] = (byte)(value/2*2+1);
					break;
				case 0x1EF1:
					chr_regs_1k[2] = (byte)(value/2*2);
					chr_regs_1k[3] = (byte)(value/2*2+1);
					break;
				
				case 0x1EF2:
					chr_regs_1k[4] = value;
					break;
				case 0x1EF3:
					chr_regs_1k[5] = value;
					break;
				case 0x1EF4:
					chr_regs_1k[6] = value;
					break;
				case 0X1EF5:
					chr_regs_1k[7] = value;
					break;

				case 0x1EFA: //PRG Reg 0
				case 0x1EFB:
					prg_regs_8k[0] = value;
					break;
				case 0x1EFC: //PRG Reg 1
				case 0x1EFD:
					prg_regs_8k[1] = value;
					break;
				case 0x1EFE: //PRG Reg 2
				case 0x1EFF:
					prg_regs_8k[2] = value;
					break;
			}
		}

		public override byte ReadPRG(int addr)
		{
			int bank_8k = addr >> 13;
			int ofs = addr & ((1 << 13) - 1);
			bank_8k = prg_regs_8k[bank_8k];
			bank_8k &= prg_bank_mask;
			addr = (bank_8k << 13) | ofs;
			return ROM[addr];
		}

		public override byte ReadPPU(int addr)
		{
			if (addr < 0x2000)
			{
				int bank_1k = addr >> 10;
				int ofs = addr & ((1 << 10) - 1);
				bank_1k = chr_regs_1k[bank_1k];
				bank_1k &= chr_bank_mask;
				addr = (bank_1k << 10) | ofs;
				return VROM[addr];
			}
			else return base.ReadPPU(addr);
		}
	}
}






/*
		 CHR Setup:
		 ---------------------------
 
						 $0000   $0400   $0800   $0C00   $1000   $1400   $1800   $1C00 
					   +---------------+---------------+-------+-------+-------+-------+
		 CHR Mode 0:   |    <$7EF0>    |    <$7EF1>    | $7EF2 | $7EF3 | $7EF4 | $7EF5 |
					   +---------------+---------------+---------------+---------------+
		 CHR Mode 1:   | $7EF2 | $7EF3 | $7EF4 | $7EF5 |    <$7EF0>    |    <$7EF1>    |
					   +-------+-------+-------+-------+---------------+---------------+
 */