#include "audio.h"

AudioGeneratorMP3 *mp3;
AudioFileSourceID3 *id3;
AudioFileSourceLittleFS *file;
AudioOutputI2S *out;

uint8_t audio_current_Song = 0;
String nextAudioFile = "";
uint8_t n = 0;

bool audioState = false;

bool audioInitOk = false;

const char *waveFile[] =
    {"/ringoffire.mp3",
     "/Let_it_be.mp3",
     "/Billy-Jean.mp3"};

// Called when a metadata event occurs (i.e. an ID3 tag, an ICY block, etc.
void MDCallback(void *cbData, const char *type, bool isUnicode, const char *string)
{
  // (void)cbData;
  // log_i("ID3 callback for: %s = '", type);

  (void)cbData;
  Serial.printf("ID3 callback for: %s = '", type);

  if (isUnicode)
  {
    string += 2;
  }

  while (*string)
  {
    char a = *(string++);
    if (isUnicode)
    {
      string++;
    }
    Serial.printf("%c", a);
  }
  Serial.printf("'\n");
  Serial.flush();
}

// Called when there's a warning or error (like a buffer underflow or decode hiccup)
void StatusCallback(void *cbData, int code, const char *string)
{
  const char *ptr = reinterpret_cast<const char *>(cbData);
  // Note that the string may be in PROGMEM, so copy it to RAM for printf
  char s1[64];
  strncpy_P(s1, string, sizeof(s1));
  s1[sizeof(s1) - 1] = 0;
  log_i("STATUS(%s) '%d' = '%s'\n", ptr, code, s1);
}

// void playSong(uint8_t index)
// {
//   if (index > AUDIONSONGS)
//     return;
//   log_i("now playing %s\n", waveFile[index]);
//   file = new AudioFileSourceLittleFS(waveFile[index]);
//   id3 = new AudioFileSourceID3(file);
//   id3->RegisterMetadataCB(MDCallback, (void *)"ID3TAG");
//   mp3->RegisterStatusCB(StatusCallback, (void *)"mp3");
//   mp3->begin(id3, out);
// }

void playSong(String filename)
{
  if (filename != "")
  {
    nextAudioFile = filename;
    log_i("now playing %s\n", filename.c_str());
    file = new AudioFileSourceLittleFS(filename.c_str());
    id3 = new AudioFileSourceID3(file);
    id3->RegisterMetadataCB(MDCallback, (void *)"ID3TAG");
    mp3->RegisterStatusCB(StatusCallback, (void *)"mp3");
    mp3->begin(id3, out);
  }
  else
  {
    log_e("no filename specified");
  }
}

void initAudio()
{
  log_i("init Audio");
  audioLogger = &Serial;
  delay(500);
  out = new AudioOutputI2S();
  out->SetPinout(I2S_BCLK, I2S_WCLK, I2S_DATA); // bclk, wclk, data
  out->SetGain(AUDIOGAIN);
  pinMode(DAC_SDMODE, OUTPUT);
  setAudioState(false);
  mp3 = new AudioGeneratorMP3();
  audioInitOk = true;
  log_i("init Audio Done");
}

void setAudioState(bool state)
{
  if(state == audioState) return;
  
  audioState = state;
  if (state)
  {
    digitalWrite(DAC_SDMODE, HIGH);
  }
  else
  {
    digitalWrite(DAC_SDMODE, LOW);
  }
  log_i("set Audio state %d", state);
}

bool getAudioState(void)
{
  return audioState;
}

bool getAudioInitStatus(void)
{
  return audioInitOk;
}

void handleAudio()
{
  if (!audioState)
  {
    if (mp3->isRunning())
    {
      log_w("Audio: stop playback");
      mp3->stop();
    }
  }
  else
  {
    if (mp3->isRunning())
    {
      if (!mp3->loop())
      {
        mp3->stop();
        log_w("Audio: loop");
        playSong(nextAudioFile);
      }
    }
  }
}