namespace BizHawk.Emulation.Consoles.TurboGrafx
{
    public partial class PCEngine
    {
        byte ReadMemoryCD(int addr)
        {
            if (addr < 0x80000) // read ROM
                return RomData[addr % RomLength];

            if (addr >= 0x1F0000 && addr < 0x1F8000) // read RAM
                return Ram[addr & 0x1FFF];

            if (addr >= 0x100000 && addr < 0x110000) // read CD RAM
                return CDRam[addr & 0xFFFF];

            if (addr >= 0xD0000 && addr < 0x100000 && SuperRam != null) // Super SysCard RAM
                return SuperRam[addr - 0xD0000];

            if (addr >= 0x1FE000) // hardware page.
            {
                if (addr < 0x1FE400) return VDC1.ReadVDC(addr);
                if (addr < 0x1FE800) { Cpu.PendingCycles--; return VCE.ReadVCE(addr); }
                if (addr < 0x1FEC00) return IOBuffer;
                if (addr < 0x1FF000) { IOBuffer = (byte)(Cpu.ReadTimerValue() | (IOBuffer & 0x80)); return IOBuffer; }
                if (addr >= 0x1FF000 &&
                    addr < 0x1FF400) { IOBuffer = ReadInput(); return IOBuffer; }
                if ((addr & ~1) == 0x1FF400) return IOBuffer;
                if (addr == 0x1FF402) { IOBuffer = (byte)(Cpu.IRQControlByte | (IOBuffer & 0xF8)); return IOBuffer; }
                if (addr == 0x1FF403) { IOBuffer = (byte)(Cpu.ReadIrqStatus() | (IOBuffer & 0xF8)); return IOBuffer; }
                if (addr >= 0x1FF800) return ReadCD(addr);
            }

            if (addr >= 0x80000 && addr < 0x88000 && ArcadeCard)
            {
                var page = ArcadePage[(addr >> 13) & 3];
                byte value = ArcadeRam[page.EffectiveAddress];
                page.Increment();
                return value;
            }

            if (addr >= 0x1EE000 && addr <= 0x1EE7FF)   // BRAM
            {
                if (BramEnabled && BramLocked == false)
                    return BRAM[addr & 0x7FF];
                return 0xFF;
            }

            Log.Error("MEM", "UNHANDLED READ: {0:X6}", addr);
            return 0xFF;
        }

        void WriteMemoryCD(int addr, byte value)
        {
            if (addr >= 0x1F0000 && addr < 0x1F8000) // write RAM.
                Ram[addr & 0x1FFF] = value;

            else if (addr >= 0x100000 && addr < 0x110000) // write CD-RAM
                CDRam[addr & 0xFFFF] = value;

            else if (addr >= 0xD0000 && addr < 0x100000 && SuperRam != null) // Super SysCard RAM
                SuperRam[addr - 0xD0000] = value;

            else if (addr >= 0x1FE000) // hardware page.
            {
                if (addr < 0x1FE400) VDC1.WriteVDC(addr, value);
                else if (addr < 0x1FE800) { Cpu.PendingCycles--; VCE.WriteVCE(addr, value); }
                else if (addr < 0x1FEC00) { IOBuffer = value; PSG.WritePSG((byte)addr, value, Cpu.TotalExecutedCycles); }
                else if (addr == 0x1FEC00) { IOBuffer = value; Cpu.WriteTimer(value); }
                else if (addr == 0x1FEC01) { IOBuffer = value; Cpu.WriteTimerEnable(value); }
                else if (addr >= 0x1FF000 &&
                         addr < 0x1FF400) { IOBuffer = value; WriteInput(value); }
                else if (addr == 0x1FF402) { IOBuffer = value; Cpu.WriteIrqControl(value); }
                else if (addr == 0x1FF403) { IOBuffer = value; Cpu.WriteIrqStatus(); }
                else if (addr >= 0x1FF800) { WriteCD(addr, value); }
                else Log.Error("MEM", "unhandled hardware write [{0:X6}] : {1:X2}", addr, value);
            }

            else if (addr >= 0x80000 && addr < 0x88000 && ArcadeCard) // Arcade Card
            {
                var page = ArcadePage[(addr >> 13) & 3];
                ArcadeRam[page.EffectiveAddress] = value;
                page.Increment();
            }

            else if (addr >= 0x1EE000 && addr <= 0x1EE7FF)   // BRAM
            {
                if (BramEnabled && BramLocked == false)
                {
                    BRAM[addr & 0x7FF] = value;
                    SaveRamModified = true;
                }
            }

            else
                Log.Error("MEM", "UNHANDLED WRITE: {0:X6}:{1:X2}", addr, value);
        }
    }
}