//////////////////////////////////////////////////////////////////////////
// Mapper002 UNROM                                                      //
//////////////////////////////////////////////////////////////////////////
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 Mapper002 : Mapper
	{

		BYTE patch;
		public Mapper002(NES parent) : base(parent) { }

		public override void Reset()
		{
			SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);

			patch = 0;

			uint crc = nes.rom.GetPROM_CRC();
			//	if( crc == 0x322c9b09 ) {	// Metal Gear (Alt)(J)
			////		nes.SetFrameIRQmode( FALSE );
			//	}
			//	if( crc == 0xe7a3867b ) {	// Dragon Quest 2(Alt)(J)
			//		nes.SetFrameIRQmode( FALSE );
			//	}
			////	if( crc == 0x9622fbd9 ) {	// Ballblazer(J)
			////		patch = 0;
			////	}
			if (crc == 0x8c3d54e8       // Ikari(J)
			 || crc == 0x655efeed       // Ikari Warriors(U)
			 || crc == 0x538218b2)
			{   // Ikari Warriors(E)
				patch = 1;
			}

			if (crc == 0xb20c1030)
			{   // Shanghai(J)(original)
				patch = 2;
			}
		}


		//void Mapper002::WriteLow(WORD addr, BYTE data)
		public override void WriteLow(ushort addr, byte data)
		{
			if (!nes.rom.IsSAVERAM())
			{
				if (addr >= 0x5000 && patch == 1)
					SetPROM_16K_Bank(4, data);
			}
			else
			{
				base.WriteLow(addr, data);
			}
		}

		//void Mapper002::Write(WORD addr, BYTE data)
		public override void Write(ushort addr, byte data)
		{
			if (patch != 2)
				SetPROM_16K_Bank(4, data);
			else
				SetPROM_16K_Bank(4, data >> 4);
		}

	}
}