/////////////////////////////
// Mapper083  Cony                                                      //
//////////////////////////////////////////////////////////////////////////
using System;
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;


namespace VirtualNes.Core
{
    public class Mapper083 : Mapper
    {
        BYTE[] reg = new byte[3];
        INT chr_bank;
        BYTE irq_enable;
        INT irq_counter;

        BYTE patch;
        public Mapper083(NES parent) : base(parent)
        {
        }

        public override void Reset()

        {
            for (INT i = 0; i < 3; i++)
            {
                reg[i] = 0x00;
            }

            if (PROM_8K_SIZE >= 32)
            {
                SetPROM_32K_Bank(0, 1, 30, 31);
                reg[1] = 0x30;
            }
            else
            {
                SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
            }

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

            chr_bank = 0;

            irq_enable = 0; // Disable
            irq_counter = 0;

            patch = 0;
            if (nes.rom.GetPROM_CRC() == 0x1461D1F8)
            {
                patch = 1;
            }
        }

        //BYTE Mapper083::ReadLow(WORD addr)
        public override byte ReadLow(ushort addr)
        {
            if ((addr & 0x5100) == 0x5100)
            {
                return reg[2];
            }
            else if (addr >= 0x6000)
            {
                return base.ReadLow(addr);
            }
            return (BYTE)(addr >> 8);
        }

        //void Mapper083::WriteLow(WORD addr, BYTE data)
        public override void WriteLow(ushort addr, byte data)
        {
            //DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes.GetScanline(), nes.cpu.GetTotalCycles() );
            switch (addr)
            {
                case 0x5101:
                case 0x5102:
                case 0x5103:
                    reg[2] = data;
                    break;
            }

            if (addr >= 0x6000)
            {
                base.WriteLow(addr, data);
            }
        }

        //void Mapper083::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            //DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes.GetScanline(), nes.cpu.GetTotalCycles() );
            switch (addr)
            {
                case 0x8000:
                case 0xB000:
                case 0xB0FF:
                case 0xB1FF:
                    reg[0] = data;
                    chr_bank = (data & 0x30) << 4;
                    SetPROM_16K_Bank(4, data);
                    SetPROM_16K_Bank(6, (data & 0x30) | 0x0F);
                    break;

                case 0x8100:
                    reg[1] = (byte)(data & 0x80);
                    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 0x8200:
                    irq_counter = (irq_counter & 0xFF00) | (INT)data;
                    //			nes.cpu.ClrIRQ( IRQ_MAPPER );
                    break;
                case 0x8201:
                    irq_counter = (irq_counter & 0x00FF) | ((INT)data << 8);
                    irq_enable = reg[1];
                    //			nes.cpu.ClrIRQ( IRQ_MAPPER );
                    break;

                case 0x8300:
                    SetPROM_8K_Bank(4, data);
                    break;
                case 0x8301:
                    SetPROM_8K_Bank(5, data);
                    break;
                case 0x8302:
                    SetPROM_8K_Bank(6, data);
                    break;

                case 0x8310:
                    if (patch != 0)
                    {
                        SetVROM_2K_Bank(0, chr_bank | data);
                    }
                    else
                    {
                        SetVROM_1K_Bank(0, chr_bank | data);
                    }
                    break;
                case 0x8311:
                    if (patch != 0)
                    {
                        SetVROM_2K_Bank(2, chr_bank | data);
                    }
                    else
                    {
                        SetVROM_1K_Bank(1, chr_bank | data);
                    }
                    break;
                case 0x8312:
                    SetVROM_1K_Bank(2, chr_bank | data);
                    break;
                case 0x8313:
                    SetVROM_1K_Bank(3, chr_bank | data);
                    break;
                case 0x8314:
                    SetVROM_1K_Bank(4, chr_bank | data);
                    break;
                case 0x8315:
                    SetVROM_1K_Bank(5, chr_bank | data);
                    break;
                case 0x8316:
                    if (patch != 0)
                    {
                        SetVROM_2K_Bank(4, chr_bank | data);
                    }
                    else
                    {
                        SetVROM_1K_Bank(6, chr_bank | data);
                    }
                    break;
                case 0x8317:
                    if (patch != 0)
                    {
                        SetVROM_2K_Bank(6, chr_bank | data);
                    }
                    else
                    {
                        SetVROM_1K_Bank(7, chr_bank | data);
                    }
                    break;

                case 0x8318:
                    SetPROM_16K_Bank(4, (reg[0] & 0x30) | data);
                    break;
            }
        }

        //void Mapper083::HSync(INT scanline)
        public override void HSync(int scanline)
        {
            if (irq_enable != 0)
            {
                if (irq_counter <= 113)
                {
                    //			nes.cpu.IRQ();
                    irq_enable = 0;
                    //			nes.cpu.SetIRQ( IRQ_MAPPER );
                    nes.cpu.SetIRQ(IRQ_TRIGGER);
                }
                else
                {
                    irq_counter -= 113;
                }
            }
        }

        //void Mapper083::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = reg[0];
            p[1] = reg[1];
            p[2] = reg[2];
            //*(INT*)&p[3] = chr_bank;
            BitConverter.GetBytes(chr_bank).CopyTo(p, 3);
            p[7] = irq_enable;
            //*(INT*)&p[8] = irq_counter;
            BitConverter.GetBytes(irq_counter).CopyTo(p, 8);
        }

        //void Mapper083::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            reg[0] = p[0];
            reg[1] = p[1];
            reg[2] = p[2];
            //chr_bank = *(INT*)&p[3];
            chr_bank = BitConverter.ToInt32(p, 3);
            irq_enable = p[7];
            //irq_counter = *(INT*)&p[8];
            irq_counter = BitConverter.ToInt32(p, 8);
        }

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