//////////////////////////////////////////////////////////////////////////
// Mapper160  PC-Aladdin                                                //
//////////////////////////////////////////////////////////////////////////
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 Mapper160 : Mapper
    {
        BYTE irq_enable;
        BYTE irq_counter;
        BYTE irq_latch;
        BYTE refresh_type;
        public Mapper160(NES parent) : base(parent)
        {
        }

        public override void Reset()

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

            irq_enable = 0;
            irq_counter = 0;
            irq_latch = 0;
            refresh_type = 0;
        }

        //void Mapper160::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            switch (addr)
            {
                case 0x8000:
                    SetPROM_8K_Bank(4, data);
                    break;
                case 0x8001:
                    SetPROM_8K_Bank(5, data);
                    break;
                case 0x8002:
                    SetPROM_8K_Bank(6, data);
                    break;

                case 0x9000:
                    if (data == 0x2B)
                    {
                        refresh_type = 1;
                    }
                    else if (data == 0xA8)
                    {
                        refresh_type = 2;
                    }
                    else if (data == 0x1F)
                    {
                        refresh_type = 3;
                    }
                    else if (data == 0x7C)
                    {
                        refresh_type = 4;
                    }
                    else if (data == 0x18)
                    {
                        refresh_type = 5;
                    }
                    else if (data == 0x60)
                    {
                        refresh_type = 6;
                    }
                    else
                    {
                        refresh_type = 0;
                    }
                    SetVROM_1K_Bank(0, data);
                    break;
                case 0x9001:
                    SetVROM_1K_Bank(1, data);
                    break;

                case 0x9002:
                    if (refresh_type == 2 && data != 0xE8)
                    {
                        refresh_type = 0;
                    }
                    SetVROM_1K_Bank(2, data);
                    break;

                case 0x9003:
                    SetVROM_1K_Bank(3, data);
                    break;
                case 0x9004:
                    SetVROM_1K_Bank(4, data);
                    break;
                case 0x9005:
                    SetVROM_1K_Bank(5, data);
                    break;
                case 0x9006:
                    SetVROM_1K_Bank(6, data);
                    break;
                case 0x9007:
                    SetVROM_1K_Bank(7, data);
                    break;

                case 0xC000:
                    irq_counter = irq_latch;
                    irq_enable = irq_latch;
                    break;
                case 0xC001:
                    irq_latch = data;
                    break;
                case 0xC002:
                    irq_enable = 0;
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                    break;
                case 0xC003:
                    irq_counter = data;
                    break;
            }
        }

        //void Mapper160::HSync(INT scanline)
        public override void HSync(int scanline)
        {
            if (scanline == 0 || scanline == 239)
            {
                switch (refresh_type)
                {
                    case 1:
                        SetVROM_8K_Bank(0x58, 0x59, 0x5A, 0x5B, 0x58, 0x59, 0x5A, 0x5B);
                        break;
                    case 2:
                        SetVROM_8K_Bank(0x78, 0x79, 0x7A, 0x7B, 0x78, 0x79, 0x7A, 0x7B);
                        break;
                    case 3:
                        SetVROM_8K_Bank(0x7C, 0x7D, 0x7E, 0x7F, 0x7C, 0x7D, 0x7E, 0x7F);
                        break;
                    case 5:
                        SetVROM_8K_Bank(0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77);
                        break;
                    case 6:
                        SetVROM_8K_Bank(0x5C, 0x5D, 0x5E, 0x5F, 0x7C, 0x7D, 0x7E, 0x7F);
                        break;
                }
            }
            if (scanline == 64)
            {
                if (refresh_type == 4)
                {
                    if (PPU_MEM_BANK[8][32 * 10 + 16] == 0x0A)
                    {
                        SetVROM_1K_Bank(0, 0x68);
                        SetVROM_1K_Bank(1, 0x69);
                        SetVROM_1K_Bank(2, 0x6A);
                        SetVROM_1K_Bank(3, 0x6B);
                    }
                    else
                    {
                        SetVROM_1K_Bank(0, 0x6C);
                        SetVROM_1K_Bank(1, 0x6D);
                        SetVROM_1K_Bank(2, 0x6E);
                        SetVROM_1K_Bank(3, 0x6F);
                    }
                }
            }
            if (scanline == 128)
            {
                if (refresh_type == 4)
                {
                    SetVROM_1K_Bank(0, 0x68);
                    SetVROM_1K_Bank(1, 0x69);
                    SetVROM_1K_Bank(2, 0x6A);
                    SetVROM_1K_Bank(3, 0x6B);
                }
                else if (refresh_type == 5)
                {
                    SetVROM_8K_Bank(0x74, 0x75, 0x76, 0x77, 0x74, 0x75, 0x76, 0x77);
                }
            }
            if (scanline == 160)
            {
                if (refresh_type == 6)
                {
                    SetVROM_8K_Bank(0x60, 0x61, 0x5E, 0x5F, 0x7C, 0x7D, 0x7E, 0x7F);
                }
            }

            if (irq_enable != 0)
            {
                if (irq_counter == 0xFF)
                {
                    //			nes.cpu.IRQ_NotPending();
                    irq_enable = 0;
                    irq_counter = 0;
                    nes.cpu.SetIRQ(IRQ_MAPPER);
                }
                else
                {
                    irq_counter++;
                }
            }
        }

        //void Mapper160::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = irq_enable;
            p[1] = irq_counter;
            p[2] = irq_latch;
            p[3] = refresh_type;
        }

        //
        //void Mapper160::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            irq_enable = p[0];
            irq_counter = p[1];
            irq_latch = p[2];
            refresh_type = p[3];
        }


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