//////////////////////////////////////////////////////////////////////////
// Mapper183  Gimmick (Bootleg)                                         //
//////////////////////////////////////////////////////////////////////////
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 Mapper183 : Mapper
    {
        BYTE[] reg = new byte[8];
        BYTE irq_enable;
        INT irq_counter;
        public Mapper183(NES parent) : base(parent)
        {
        }

        public override void Reset()

        {
            SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
            SetVROM_8K_Bank(0);

            for (byte i = 0; i < 8; i++)
            {
                reg[i] = i;
            }
            irq_enable = 0;
            irq_counter = 0;
        }

        //void Mapper183::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            switch (addr)
            {
                case 0x8800:
                    SetPROM_8K_Bank(4, data);
                    break;
                case 0xA800:
                    SetPROM_8K_Bank(5, data);
                    break;
                case 0xA000:
                    SetPROM_8K_Bank(6, data);
                    break;

                case 0xB000:
                    reg[0] = (byte)((reg[0] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(0, reg[0]);
                    break;
                case 0xB004:
                    reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(0, reg[0]);
                    break;
                case 0xB008:
                    reg[1] = (byte)((reg[1] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(1, reg[1]);
                    break;
                case 0xB00C:
                    reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(1, reg[1]);
                    break;

                case 0xC000:
                    reg[2] = (byte)((reg[2] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(2, reg[2]);
                    break;
                case 0xC004:
                    reg[2] = (byte)((reg[2] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(2, reg[2]);
                    break;
                case 0xC008:
                    reg[3] = (byte)((reg[3] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(3, reg[3]);
                    break;
                case 0xC00C:
                    reg[3] = (byte)((reg[3] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(3, reg[3]);
                    break;

                case 0xD000:
                    reg[4] = (byte)((reg[4] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(4, reg[4]);
                    break;
                case 0xD004:
                    reg[4] = (byte)((reg[4] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(4, reg[4]);
                    break;
                case 0xD008:
                    reg[5] = (byte)((reg[5] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(5, reg[5]);
                    break;
                case 0xD00C:
                    reg[5] = (byte)((reg[5] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(5, reg[5]);
                    break;

                case 0xE000:
                    reg[6] = (byte)((reg[6] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(6, reg[6]);
                    break;
                case 0xE004:
                    reg[6] = (byte)((reg[6] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(6, reg[6]);
                    break;
                case 0xE008:
                    reg[7] = (byte)((reg[3] & 0xF0) | (data & 0x0F));
                    SetVROM_1K_Bank(7, reg[7]);
                    break;
                case 0xE00C:
                    reg[7] = (byte)((reg[3] & 0x0F) | ((data & 0x0F) << 4));
                    SetVROM_1K_Bank(7, reg[7]);
                    break;

                case 0x9008:
                    if (data == 1)
                    {
                        for (byte i = 0; i < 8; i++)
                        {
                            reg[i] = i;
                        }
                        SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
                        SetVROM_8K_Bank(0);
                    }
                    break;

                case 0x9800:
                    if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR);
                    else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR);
                    else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L);
                    else if (data == 3) SetVRAM_Mirror(VRAM_MIRROR4H);
                    break;

                case 0xF000:
                    irq_counter = (irq_counter & 0xFF00) | data;
                    break;
                case 0xF004:
                    irq_counter = (irq_counter & 0x00FF) | (data << 8);
                    break;
                case 0xF008:
                    irq_enable = data;
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                    break;
            }
        }

        //void Mapper183::HSync(INT scanline)
        public override void HSync(int scanline)
        {
            if ((irq_enable & 0x02) != 0)
            {
                if (irq_counter <= 113)
                {
                    irq_counter = 0;
                    //			nes.cpu.IRQ_NotPending();
                    nes.cpu.SetIRQ(IRQ_MAPPER);
                }
                else
                {
                    irq_counter -= 113;
                }
            }
        }

        //void Mapper183::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            //for (INT i = 0; i < 8; i++)
            //{
            //    p[i] = reg[i];
            //}
            //p[8] = irq_enable;
            //*((INT*)&p[9]) = irq_counter;
        }

        //void Mapper183::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            //    for (INT i = 0; i < 8; i++)
            //    {
            //        reg[i] = p[i];
            //    }
            //    irq_enable = p[8];
            //    irq_counter = *((INT*)&p[9]);
        }

        public override bool IsStateSave()
        {
            return true;
        }

    }
}