#include <Arduino.h>
#include <SPI.h>
#include <SD.h>
#include <Wire.h>

const int RP_CLK_GPIO = 2;
const int RP_CMD_GPIO = 7;
const int RP_DAT0_GPIO = 3;
const int RECORD = 23;

#include "AudioTools.h"
#include "AudioTools/AudioCodecs/CodecMP3LAME.h"

File outputFile;
EncodedAudioStream out(&outputFile, new MP3EncoderLAME());
I2SStream i2sStream;    // Access I2S as stream
StreamCopy copier(out, i2sStream);  // copies data

int start = 0;

void setup() {
  Serial.begin(115200);

  while (!Serial) {
    delay(1);  // wait for serial port to connect. Needed for native USB port only
  }

  pinMode(RECORD, OUTPUT);

  AudioLogger::instance().begin(Serial, AudioLogger::Info);
  if(!SD.begin(RP_CLK_GPIO, RP_CMD_GPIO, RP_DAT0_GPIO)) {
    Serial.println("SD init failed!");
  }
  SD.remove("/test.mp3");
  outputFile = SD.open("/test.mp3", FILE_WRITE);
  if (!outputFile) {
    Serial.println("File open failed!");
    return;
  }

  
  Serial.println("starting I2S...");
  auto config = i2sStream.defaultConfig(RX_MODE);
  config.i2s_format = I2S_PHILIPS_FORMAT; // if quality is bad change to I2S_LSB_FORMAT https://github.com/pschatzmann/arduino-audio-tools/issues/23
  config.sample_rate = 8000;
  config.channels = 2;
  config.bits_per_sample = 16;
  config.pin_bck = 18;
  config.pin_ws = 19;
  config.pin_data = 20;

  i2sStream.begin(config);
  Serial.println("I2S started");
  out.begin(config);

  Serial.println("Test started...");
  start = millis();
  digitalWrite(RECORD, LOW);
}

void loop() { 
  if ((millis() - start) < 10000) {
    // record to wav file
    copier.copy();
  } else {
    // close file when done
    if (outputFile) {
      digitalWrite(RECORD, HIGH);
      outputFile.flush();
      Serial.print("File has ");
      Serial.print(outputFile.size());
      Serial.println(" bytes");
      outputFile.close();
    }
  }
}

OpusAudioEncoder enc;
EncodedAudioStream out(&outputFile, new OggContainerEncoder(enc));
...
  auto &encoderConfig = enc.config();
  encoderConfig.sample_rate = 8000;
  encoderConfig.application = OPUS_APPLICATION_AUDIO;
  encoderConfig.vbr = 1;
  encoderConfig.max_bandwidth = OPUS_BANDWIDTH_NARROWBAND;
  out.begin(encoderConfig);