using System.IO;

namespace MAME.Core
{
    public unsafe class K007232
    {
        public struct kdacApcm
        {
            public byte[][] vol;
            public uint[] addr;
            public uint[] start;
            public uint[] step;
            public uint[] bank;
            public int[] play;

            public byte[] wreg;
            public int[] pcmbuf_offset;

            public int clock;
            public int pcmlimit;
            public portwritehandler portwritehandler;
            public uint[] fncode;
        }
        public static kdacApcm info;
        public static byte[] k007232rom;
        public delegate void portwritehandler(int v);
        public static void KDAC_A_make_fncode()
        {
            int i;
            for (i = 0; i < 0x200; i++)
            {
                info.fncode[i] = (uint)((32 << 12) / (0x200 - i));
            }
        }
        public static void KDAC_A_update(int offset, int length)
        {
            int i, j;
            for (i = 0; i < 2; i++)
            {
                for (j = 0; j < length; j++)
                {
                    Sound.k007232stream.streamoutput_Ptrs[i][offset + j] = 0;
                }
            }
            for (i = 0; i < 2; i++)
            {
                if (info.play[i] != 0)
                {
                    int volA, volB, out1;
                    uint addr, old_addr;
                    addr = info.start[i] + ((info.addr[i] >> 12) & 0x000fffff);
                    volA = info.vol[i][0] * 2;
                    volB = info.vol[i][1] * 2;
                    for (j = 0; j < length; j++)
                    {
                        old_addr = addr;
                        addr = info.start[i] + ((info.addr[i] >> 12) & 0x000fffff);
                        while (old_addr <= addr)
                        {
                            if ((k007232rom[info.pcmbuf_offset[i] + old_addr] & 0x80) != 0 || old_addr >= info.pcmlimit)
                            {
                                if ((info.wreg[0x0d] & (1 << i)) != 0)
                                {
                                    info.start[i] =
                                      ((((uint)info.wreg[i * 0x06 + 0x04] << 16) & 0x00010000) |
                                       (((uint)info.wreg[i * 0x06 + 0x03] << 8) & 0x0000ff00) |
                                       (((uint)info.wreg[i * 0x06 + 0x02]) & 0x000000ff) |
                                       info.bank[i]);
                                    addr = info.start[i];
                                    info.addr[i] = 0;
                                    old_addr = addr;
                                }
                                else
                                {
                                    info.play[i] = 0;
                                }
                                break;
                            }
                            old_addr++;
                        }
                        if (info.play[i] == 0)
                        {
                            break;
                        }
                        info.addr[i] += info.step[i];
                        out1 = (k007232rom[info.pcmbuf_offset[i] + addr] & 0x7f) - 0x40;
                        Sound.k007232stream.streamoutput_Ptrs[0][offset + j] += out1 * volA;
                        Sound.k007232stream.streamoutput_Ptrs[1][offset + j] += out1 * volB;
                    }
                }
            }
        }
        public static void k007232_start(int clock)
        {
            int i;
            info = new kdacApcm();
            info.portwritehandler = Konami68000.volume_callback;
            info.pcmbuf_offset = new int[2];
            info.addr = new uint[2];
            info.start = new uint[2];
            info.step = new uint[2];
            info.play = new int[2];
            info.bank = new uint[2];
            info.vol = new byte[2][];
            info.wreg = new byte[0x10];
            info.fncode = new uint[0x200];
            info.pcmbuf_offset[0] = 0;
            info.pcmbuf_offset[1] = 0;
            info.pcmlimit = k007232rom.Length;
            info.clock = clock;
            for (i = 0; i < 2; i++)
            {
                info.start[i] = 0;
                info.step[i] = 0;
                info.play[i] = 0;
                info.bank[i] = 0;
                info.vol[i] = new byte[2];
            }
            info.vol[0][0] = 255;
            info.vol[0][1] = 0;
            info.vol[1][0] = 0;
            info.vol[1][1] = 255;
            for (i = 0; i < 0x10; i++)
            {
                info.wreg[i] = 0;
            }
            KDAC_A_make_fncode();
        }
        public static void k007232_WriteReg(int r, int v, int chip)
        {
            int data;
            Sound.k007232stream.stream_update();
            info.wreg[r] = (byte)v;
            if (r == 0x0c)
            {
                if (info.portwritehandler != null)
                {
                    info.portwritehandler(v);
                }
                return;
            }
            else if (r == 0x0d)
            {
                return;
            }
            else
            {
                int reg_port;
                reg_port = 0;
                if (r >= 0x06)
                {
                    reg_port = 1;
                    r -= 0x06;
                }
                switch (r)
                {
                    case 0x00:
                    case 0x01:
                        data = (int)(((((uint)info.wreg[reg_port * 0x06 + 0x01]) << 8) & 0x0100) | (((uint)info.wreg[reg_port * 0x06 + 0x00]) & 0x00ff));
                        info.step[reg_port] = info.fncode[data];
                        break;
                    case 0x02:
                    case 0x03:
                    case 0x04:
                        break;
                    case 0x05:
                        info.start[reg_port] =
                      ((((uint)info.wreg[reg_port * 0x06 + 0x04] << 16) & 0x00010000) |
                       (((uint)info.wreg[reg_port * 0x06 + 0x03] << 8) & 0x0000ff00) |
                       (((uint)info.wreg[reg_port * 0x06 + 0x02]) & 0x000000ff) |
                       info.bank[reg_port]);
                        if (info.start[reg_port] < info.pcmlimit)
                        {
                            info.play[reg_port] = 1;
                            info.addr[reg_port] = 0;
                        }
                        break;
                }
            }
        }
        public static int k007232_ReadReg(int r, int chip)
        {
            int ch = 0;
            if (r == 0x0005 || r == 0x000b)
            {
                ch = r / 0x0006;
                r = ch * 0x0006;
                info.start[ch] =
                  ((((uint)info.wreg[r + 0x04] << 16) & 0x00010000) |
                   (((uint)info.wreg[r + 0x03] << 8) & 0x0000ff00) |
                   (((uint)info.wreg[r + 0x02]) & 0x000000ff) |
                   info.bank[ch]);
                if (info.start[ch] < info.pcmlimit)
                {
                    info.play[ch] = 1;
                    info.addr[ch] = 0;
                }
            }
            return 0;
        }
        public static void k007232_write_port_0_w(int offset, byte data)
        {
            k007232_WriteReg(offset, data, 0);
        }
        public static byte k007232_read_port_0_r(int offset)
        {
            return (byte)k007232_ReadReg(offset, 0);
        }
        public static void k007232_write_port_1_w(int offset, byte data)
        {
            k007232_WriteReg(offset, data, 1);
        }
        public static byte k007232_read_port_1_r(int offset)
        {
            return (byte)k007232_ReadReg(offset, 1);
        }
        public static void k007232_write_port_2_w(int offset, byte data)
        {
            k007232_WriteReg(offset, data, 2);
        }
        public static byte k007232_read_port_2_r(int offset)
        {
            return (byte)k007232_ReadReg(offset, 2);
        }
        public static void k007232_set_volume(int chip, int channel, int volumeA, int volumeB)
        {
            info.vol[channel][0] = (byte)volumeA;
            info.vol[channel][1] = (byte)volumeB;
        }
        public static void k007232_set_bank(int chip, int chABank, int chBBank)
        {
            info.bank[0] = (uint)(chABank << 17);
            info.bank[1] = (uint)(chBBank << 17);
        }
        public static void SaveStateBinary(BinaryWriter writer)
        {
            int i, j;
            for (i = 0; i < 2; i++)
            {
                for (j = 0; j < 2; j++)
                {
                    writer.Write(info.vol[i][j]);
                }
            }
            for (i = 0; i < 2; i++)
            {
                writer.Write(info.addr[i]);
            }
            for (i = 0; i < 2; i++)
            {
                writer.Write(info.start[i]);
            }
            for (i = 0; i < 2; i++)
            {
                writer.Write(info.step[i]);
            }
            for (i = 0; i < 2; i++)
            {
                writer.Write(info.bank[i]);
            }
            for (i = 0; i < 2; i++)
            {
                writer.Write(info.play[i]);
            }
            for (i = 0; i < 0x10; i++)
            {
                writer.Write(info.wreg[i]);
            }
            for (i = 0; i < 2; i++)
            {
                writer.Write(info.pcmbuf_offset[i]);
            }
        }
        public static void LoadStateBinary(BinaryReader reader)
        {
            int i, j;
            for (i = 0; i < 2; i++)
            {
                for (j = 0; j < 2; j++)
                {
                    info.vol[i][j] = reader.ReadByte();
                }
            }
            for (i = 0; i < 2; i++)
            {
                info.addr[i] = reader.ReadUInt32();
            }
            for (i = 0; i < 2; i++)
            {
                info.start[i] = reader.ReadUInt32();
            }
            for (i = 0; i < 2; i++)
            {
                info.step[i] = reader.ReadUInt32();
            }
            for (i = 0; i < 2; i++)
            {
                info.bank[i] = reader.ReadUInt32();
            }
            for (i = 0; i < 2; i++)
            {
                info.play[i] = reader.ReadInt32();
            }
            for (i = 0; i < 0x10; i++)
            {
                info.wreg[i] = reader.ReadByte();
            }
            for (i = 0; i < 2; i++)
            {
                info.pcmbuf_offset[i] = reader.ReadInt32();
            }
        }
    }
}