/**
 * Furnace Tracker - multi-system chiptune tracker
 * Copyright (C) 2021-2022 tildearrow and contributors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef _TAAUDIO_H
#define _TAAUDIO_H
#include "../ta-utils.h"
#include <vector>

struct SampleRateChangeEvent {
  double rate;
  SampleRateChangeEvent(double r):
    rate(r) {}
};

struct BufferSizeChangeEvent {
  unsigned int bufsize;
  BufferSizeChangeEvent(unsigned int bs):
    bufsize(bs) {}
};

enum TAAudioFormat {
  TA_AUDIO_FORMAT_F32=0,
  TA_AUDIO_FORMAT_F64,
  TA_AUDIO_FORMAT_U8,
  TA_AUDIO_FORMAT_S8,
  TA_AUDIO_FORMAT_U16,
  TA_AUDIO_FORMAT_S16,
  TA_AUDIO_FORMAT_U32,
  TA_AUDIO_FORMAT_S32,
  TA_AUDIO_FORMAT_U16BE,
  TA_AUDIO_FORMAT_S16BE,
  TA_AUDIO_FORMAT_U32BE,
  TA_AUDIO_FORMAT_S32BE
};

struct TAAudioDesc {
  String name, deviceName;
  double rate;
  unsigned int bufsize, fragments;
  unsigned char inChans, outChans;
  TAAudioFormat outFormat;

  TAAudioDesc():
    rate(0.0),
    bufsize(0),
    fragments(0),
    inChans(0),
    outChans(0),
    outFormat(TA_AUDIO_FORMAT_F32) {}
};


enum TAMidiMessageTypes {
  TA_MIDI_NOTE_OFF=0x80,
  TA_MIDI_NOTE_ON=0x90,
  TA_MIDI_AFTERTOUCH=0xa0,
  TA_MIDI_CONTROL=0xb0,
  TA_MIDI_PROGRAM=0xc0,
  TA_MIDI_CHANNEL_AFTERTOUCH=0xd0,
  TA_MIDI_PITCH_BEND=0xe0,
  TA_MIDI_SYSEX=0xf0,
  TA_MIDI_MTC_FRAME=0xf1,
  TA_MIDI_POSITION=0xf2,
  TA_MIDI_SONG_SELECT=0xf3,
  TA_MIDI_TUNE_REQUEST=0xf6,
  TA_MIDI_SYSEX_END=0xf7,
  TA_MIDI_CLOCK=0xf8,
  TA_MIDI_MACHINE_PLAY=0xfa,
  TA_MIDI_MACHINE_RESUME=0xfb,
  TA_MIDI_MACHINE_STOP=0xfc,
  TA_MIDI_KEEPALIVE=0xfe,
  TA_MIDI_RESET=0xff
};

struct TAMidiMessage {
  unsigned char type;
  union {
    struct {
      unsigned char note, vol;
    } note;
    struct {
      unsigned char which, val;
    } control;
    unsigned char patch;
    unsigned char pressure;
    struct {
      unsigned char low, high;
    } pitch;
    struct {
      unsigned int vendor;
    } sysEx;
    unsigned char timeCode;
    struct {
      unsigned char low, high;
    } position;
    unsigned char song;
  } data;
  unsigned char* sysExData;
  size_t sysExLen;

  void submitSysEx(std::vector<unsigned char> data);
  void done();
};

class TAMidiIn {
  public:
    bool next(TAMidiMessage& where);
};

class TAMidiOut {
  public:
    bool send(TAMidiMessage& what);
};

class TAAudio {
  protected:
    TAAudioDesc desc;
    TAAudioFormat outFormat;
    bool running, initialized;
    float** inBufs;
    float** outBufs;
    void (*audioProcCallback)(void*,float**,float**,int,int,unsigned int);
    void* audioProcCallbackUser;
    void (*sampleRateChanged)(SampleRateChangeEvent);
    void (*bufferSizeChanged)(BufferSizeChangeEvent);
  public:
    std::vector<TAMidiIn*> midiIn;
    std::vector<TAMidiOut*> midiOut;
    void setSampleRateChangeCallback(void (*callback)(SampleRateChangeEvent));
    void setBufferSizeChangeCallback(void (*callback)(BufferSizeChangeEvent));

    void setCallback(void (*callback)(void*,float**,float**,int,int,unsigned int), void* user);

    virtual void* getContext();
    virtual bool quit();
    virtual bool setRun(bool run);
    virtual std::vector<String> listAudioDevices();
    virtual bool init(TAAudioDesc& request, TAAudioDesc& response);

    TAAudio():
      outFormat(TA_AUDIO_FORMAT_F32),
      running(false),
      initialized(false),
      inBufs(NULL),
      outBufs(NULL),
      audioProcCallback(NULL),
      sampleRateChanged(NULL),
      bufferSizeChanged(NULL) {}

    virtual ~TAAudio();
};
#endif