// based om helix mp3 decoder
#pragma once

#include "../Audio.h"
#include "structs.h"
#include "tables.h"

class MP3Decoder : public Decoder {

  public:
    MP3Decoder(Audio& audioRef) : Decoder(audioRef), audio(audioRef) {}
    ~MP3Decoder() { reset(); }
    bool                  init() override;
    void                  clear() override;
    void                  reset() override;
    bool                  isValid() override;
    int32_t               findSyncWord(uint8_t* buf, int32_t nBytes) override;
    uint8_t               getChannels() override;
    uint32_t              getSampleRate() override;
    uint32_t              getOutputSamples();
    uint8_t               getBitsPerSample() override;
    uint32_t              getBitRate() override;
    uint32_t              getAudioDataStart() override;
    uint32_t              getAudioFileDuration() override;
    const char*           getStreamTitle() override;
    const char*           whoIsIt() override;
    int32_t               decode(uint8_t* inbuf, int32_t* bytesLeft, int32_t* outbuf) override;
    void                  setRawBlockParams(uint8_t channels, uint32_t sampleRate, uint8_t BPS, uint32_t tsis, uint32_t AuDaLength) override;
    std::vector<uint32_t> getMetadataBlockPicture() override;
    const char*           arg1() override; // MPEG Version and Layer
    const char*           arg2() override;
    virtual int32_t       val1() override;
    virtual int32_t       val2() override;

    enum {
        MP3_NONE = 0,
        MP3_ERR = -1,
        MP3_MAIN_DATA_UNDERFLOW = -2,
        MP3_NEED_RESTART = -3,
        MP3_STOP = -100,
        MP3_NEXT_FRAME = 100,
    };

  private:
    Audio& audio;

    SFBandTable_t        m_SFBandTable;
    StereoMode_t         m_sMode;       /* mono/stereo mode */
    MPEGVersion_t        m_MPEGVersion; /* version ID */
    SideInfoSub_t        m_SideInfoSub[MAX_NGRAN][MAX_NCHAN];
    CriticalBandInfo_t   m_CriticalBandInfo[MAX_NCHAN]; /* filled in dequantizer, used in joint stereo reconstruction */
    ScaleFactorInfoSub_t m_ScaleFactorInfoSub[MAX_NGRAN][MAX_NCHAN];

    ps_ptr<MP3DecInfo_t>    m_MP3DecInfo;
    ps_ptr<FrameHeader_t>   m_FrameHeader;
    ps_ptr<SideInfo_t>      m_SideInfo;
    ps_ptr<ScaleFactorJS_t> m_ScaleFactorJS;
    ps_ptr<HuffmanInfo_t>   m_HuffmanInfo;
    ps_ptr<DequantInfo_t>   m_DequantInfo;
    ps_ptr<IMDCTInfo_t>     m_IMDCTInfo;
    ps_ptr<SubbandInfo_t>   m_SubbandInfo;
    ps_ptr<MP3FrameInfo_t>  m_MP3FrameInfo;
    ps_ptr<char>            m_mpeg_version_str;
    ps_ptr<int16_t>         m_out16;

    invalid_frame m_invalid_frame;

    // internally used
    int32_t  IsLikelyRealFrame(const uint8_t* p, int32_t bytesLeft);
    void     MP3GetLastFrameInfo();
    int32_t  MP3GetNextFrameInfo(uint8_t* buf);
    int      MP3_AnalyzeFrame(const uint8_t* frame_data, size_t frame_len);
    void     PolyphaseMono(int16_t* pcm, int32_t* vbuf, const uint32_t* coefBase);
    void     PolyphaseStereo(int16_t* pcm, int32_t* vbuf, const uint32_t* coefBase);
    void     SetBitstreamPointer(BitStreamInfo_t* bsi, int32_t nBytes, uint8_t* buf);
    uint32_t GetBits(BitStreamInfo_t* bsi, int32_t nBits);
    int32_t  CalcBitsUsed(BitStreamInfo_t* bsi, uint8_t* startBuf, int32_t startOffset);
    int32_t  DequantChannel(int32_t* sampleBuf, int32_t* workBuf, int32_t* nonZeroBound, SideInfoSub_t* sis, ScaleFactorInfoSub_t* sfis, CriticalBandInfo_t* cbi);
    void     MidSideProc(int32_t x[MAX_NCHAN][MAX_NSAMP], int32_t nSamps, int32_t mOut[2]);
    void     IntensityProcMPEG1(int32_t x[MAX_NCHAN][MAX_NSAMP], int32_t nSamps, ScaleFactorInfoSub_t* sfis, CriticalBandInfo_t* cbi, int32_t midSideFlag, int32_t mixFlag, int32_t mOut[2]);
    void     IntensityProcMPEG2(int32_t x[MAX_NCHAN][MAX_NSAMP], int32_t nSamps, ScaleFactorInfoSub_t* sfis, CriticalBandInfo_t* cbi, ScaleFactorJS_t* sfjs, int32_t midSideFlag, int32_t mixFlag,
                                int32_t mOut[2]);
    void     FDCT32(int32_t* x, int32_t* d, int32_t offset, int32_t oddBlock, int32_t gb); // __attribute__ ((section (".data")));
    int32_t  CheckPadBit();
    int32_t  UnpackFrameHeader(uint8_t* buf);
    int32_t  UnpackSideInfo(uint8_t* buf);
    int32_t  DecodeHuffman(uint8_t* buf, int32_t* bitOffset, int32_t huffBlockBits, int32_t gr, int32_t ch);
    int32_t  MP3Dequantize(int32_t gr);
    int32_t  IMDCT(int32_t gr, int32_t ch);
    int32_t  UnpackScaleFactors(uint8_t* buf, int32_t* bitOffset, int32_t bitsAvail, int32_t gr, int32_t ch);
    int32_t  Subband(int16_t* pcmBuf);
    int16_t  ClipToShort(int32_t x, int32_t fracBits);
    void     RefillBitstreamCache(BitStreamInfo_t* bsi);
    void     UnpackSFMPEG1(BitStreamInfo_t* bsi, SideInfoSub_t* sis, ScaleFactorInfoSub_t* sfis, int32_t* scfsi, int32_t gr, ScaleFactorInfoSub_t* sfisGr0);
    void     UnpackSFMPEG2(BitStreamInfo_t* bsi, SideInfoSub_t* sis, ScaleFactorInfoSub_t* sfis, int32_t gr, int32_t ch, int32_t modeExt, ScaleFactorJS_t* sfjs);
    int32_t  MP3FindFreeSync(uint8_t* buf, uint8_t firstFH[4], int32_t nBytes);
    void     MP3ClearBadFrame(int16_t* outbuf);
    int32_t  DecodeHuffmanPairs(int32_t* xy, int32_t nVals, int32_t tabIdx, int32_t bitsLeft, uint8_t* buf, int32_t bitOffset);
    int32_t  DecodeHuffmanQuads(int32_t* vwxy, int32_t nVals, int32_t tabIdx, int32_t bitsLeft, uint8_t* buf, int32_t bitOffset);
    int32_t  DequantBlock(int32_t* inbuf, int32_t* outbuf, int32_t num, int32_t scale);
    void     AntiAlias(int32_t* x, int32_t nBfly);
    void     WinPrevious(int32_t* xPrev, int32_t* xPrevWin, int32_t btPrev);
    int32_t  FreqInvertRescale(int32_t* y, int32_t* xPrev, int32_t blockIdx, int32_t es);
    void     idct9(int32_t* x);
    int32_t  IMDCT36(int32_t* xCurr, int32_t* xPrev, int32_t* y, int32_t btCurr, int32_t btPrev, int32_t blockIdx, int32_t gb);
    void     imdct12(int32_t* x, int32_t* out);
    int32_t  IMDCT12x3(int32_t* xCurr, int32_t* xPrev, int32_t* y, int32_t btPrev, int32_t blockIdx, int32_t gb);
    int32_t  HybridTransform(int32_t* xCurr, int32_t* xPrev, int32_t y[BLOCK_SIZE][NBANDS], SideInfoSub_t* sis, BlockCount_t* bc);
    uint64_t SAR64(uint64_t x, int32_t n);
    int32_t  MULSHIFT32(int32_t x, int32_t y);
    uint64_t MADD64(uint64_t sum64, int32_t x, int32_t y); /* returns 64-bit value in [edx:eax] */
    uint64_t xSAR64(uint64_t x, int32_t n);
    int32_t  FASTABS(int32_t x); // xtensa has a fast abs instruction //fb

// —————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
// Macro for comfortable calls
#define MP3_LOG_ERROR(fmt, ...)   Audio::AUDIO_LOG_IMPL(1, __FILE__, __LINE__, __func__, fmt, ##__VA_ARGS__)
#define MP3_LOG_WARN(fmt, ...)    Audio::AUDIO_LOG_IMPL(2, __FILE__, __LINE__, __func__, fmt, ##__VA_ARGS__)
#define MP3_LOG_INFO(fmt, ...)    Audio::AUDIO_LOG_IMPL(3, __FILE__, __LINE__, __func__, fmt, ##__VA_ARGS__)
#define MP3_LOG_DEBUG(fmt, ...)   Audio::AUDIO_LOG_IMPL(4, __FILE__, __LINE__, __func__, fmt, ##__VA_ARGS__)
#define MP3_LOG_VERBOSE(fmt, ...) Audio::AUDIO_LOG_IMPL(5, __FILE__, __LINE__, __func__, fmt, ##__VA_ARGS__)
    // —————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
};