using System;
using System.Runtime.InteropServices;

namespace CUETools.Codecs.MACLib
{
    internal enum APE_DECOMPRESS_FIELDS : int
    {
        APE_INFO_FILE_VERSION = 1000,               // version of the APE file * 1000 (3.93 = 3930) [ignored, ignored]
        APE_INFO_COMPRESSION_LEVEL = 1001,          // compression level of the APE file [ignored, ignored]
        APE_INFO_FORMAT_FLAGS = 1002,               // format flags of the APE file [ignored, ignored]
        APE_INFO_SAMPLE_RATE = 1003,                // sample rate (Hz) [ignored, ignored]
        APE_INFO_BITS_PER_SAMPLE = 1004,            // bits per sample [ignored, ignored]
        APE_INFO_BYTES_PER_SAMPLE = 1005,           // number of bytes per sample [ignored, ignored]
        APE_INFO_CHANNELS = 1006,                   // channels [ignored, ignored]
        APE_INFO_BLOCK_ALIGN = 1007,                // block alignment [ignored, ignored]
        APE_INFO_BLOCKS_PER_FRAME = 1008,           // number of blocks in a frame (frames are used internally)  [ignored, ignored]
        APE_INFO_FINAL_FRAME_BLOCKS = 1009,         // blocks in the final frame (frames are used internally) [ignored, ignored]
        APE_INFO_TOTAL_FRAMES = 1010,               // total number frames (frames are used internally) [ignored, ignored]
        APE_INFO_WAV_HEADER_BYTES = 1011,           // header bytes of the decompressed WAV [ignored, ignored]
        APE_INFO_WAV_TERMINATING_BYTES = 1012,      // terminating bytes of the decompressed WAV [ignored, ignored]
        APE_INFO_WAV_DATA_BYTES = 1013,             // data bytes of the decompressed WAV [ignored, ignored]
        APE_INFO_WAV_TOTAL_BYTES = 1014,            // total bytes of the decompressed WAV [ignored, ignored]
        APE_INFO_APE_TOTAL_BYTES = 1015,            // total bytes of the APE file [ignored, ignored]
        APE_INFO_TOTAL_BLOCKS = 1016,               // total blocks of audio data [ignored, ignored]
        APE_INFO_LENGTH_MS = 1017,                  // length in ms (1 sec = 1000 ms) [ignored, ignored]
        APE_INFO_AVERAGE_BITRATE = 1018,            // average bitrate of the APE [ignored, ignored]
        APE_INFO_FRAME_BITRATE = 1019,              // bitrate of specified APE frame [frame index, ignored]
        APE_INFO_DECOMPRESSED_BITRATE = 1020,       // bitrate of the decompressed WAV [ignored, ignored]
        APE_INFO_PEAK_LEVEL = 1021,                 // peak audio level (obsolete) (-1 is unknown) [ignored, ignored]
        APE_INFO_SEEK_BIT = 1022,                   // bit offset [frame index, ignored]
        APE_INFO_SEEK_BYTE = 1023,                  // byte offset [frame index, ignored]
        APE_INFO_WAV_HEADER_DATA = 1024,            // error code [buffer *, max bytes]
        APE_INFO_WAV_TERMINATING_DATA = 1025,       // error code [buffer *, max bytes]
        APE_INFO_WAVEFORMATEX = 1026,               // error code [waveformatex *, ignored]
        APE_INFO_IO_SOURCE = 1027,                  // I/O source (CIO *) [ignored, ignored]
        APE_INFO_FRAME_BYTES = 1028,                // bytes (compressed) of the frame [frame index, ignored]
        APE_INFO_FRAME_BLOCKS = 1029,               // blocks in a given frame [frame index, ignored]
        APE_INFO_TAG = 1030,                        // point to tag (CAPETag *) [ignored, ignored]

        APE_DECOMPRESS_CURRENT_BLOCK = 2000,        // current block location [ignored, ignored]
        APE_DECOMPRESS_CURRENT_MS = 2001,           // current millisecond location [ignored, ignored]
        APE_DECOMPRESS_TOTAL_BLOCKS = 2002,         // total blocks in the decompressors range [ignored, ignored]
        APE_DECOMPRESS_LENGTH_MS = 2003,            // length of the decompressors range in milliseconds [ignored, ignored]
        APE_DECOMPRESS_CURRENT_BITRATE = 2004,      // current bitrate [ignored, ignored]
        APE_DECOMPRESS_AVERAGE_BITRATE = 2005,      // average bitrate (works with ranges) [ignored, ignored]
        APE_DECOMPRESS_CURRENT_FRAME = 2006,        // current frame

        APE_INTERNAL_INFO = 3000,                   // for internal use -- don't use (returns APE_FILE_INFO *) [ignored, ignored]
    };

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    internal unsafe delegate int CIO_ReadDelegate(void* pUserData, void* pBuffer, int nBytesToRead, out int pBytesRead);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    internal unsafe delegate int CIO_WriteDelegate(void* pUserData, void* pBuffer, int nBytesToWrite, out int pBytesWritten);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    internal unsafe delegate int CIO_GetPositionDelegate(void* pUserData);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    internal unsafe delegate uint CIO_GetSizeDelegate(void* pUserData);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    internal unsafe delegate int CIO_SeekDelegate(void* pUserData, IntPtr delta, int mode);

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 2)]
    public unsafe struct WAVEFORMATEX
    {
        /// <summary>format type</summary>
        internal ushort waveFormatTag;
        /// <summary>number of channels</summary>
        internal short channels;
        /// <summary>sample rate</summary>
        internal int sampleRate;
        /// <summary>for buffer estimation</summary>
        internal int averageBytesPerSecond;
        /// <summary>block size of data</summary>
        internal short blockAlign;
        /// <summary>number of bits per sample of mono data</summary>
        internal short bitsPerSample;
        /// <summary>number of following bytes</summary>
        internal short extraSize;
    }
}