#include <stdio.h>
#include <stdlib.h>
#include <fstream>
#include <vector>
#include <poly/mini_al.h>
#include <poly/Log.h>

using namespace poly;

/* -------------------------------------------- */

static mal_uint32 audio_callback(mal_device* dev, mal_uint32 frameCount, void* dest);

/* -------------------------------------------- */

std::ifstream ifs;
std::vector<char> audio_buffer;
size_t bytes_read = 0;

/* -------------------------------------------- */

int main(int argc, char* argv[]) {

  poly_log_init(1024, argc, argv);
  poly_log_add_sink_stdout();

  SX_VERBOSE("MINI AL TEST V1");

  mal_decoder dec;
  mal_result result;
  mal_device device;
  mal_device_config config;

  config = mal_device_config_init_playback(mal_format_s16, 2, 44100, audio_callback);

  result = mal_device_init(nullptr, mal_device_type_playback, nullptr, &config, nullptr, &device);
  if (MAL_SUCCESS != result) {
    SX_ERROR("Failed to init the device. (exit)");
    exit(EXIT_FAILURE);
  }

  std::ifstream ifs;
  ifs.open("./data/test/audio/s16le-both-channels.raw", std::ios::in | std::ios::binary);
  if (false == ifs.is_open()) {
    SX_ERROR("Failed to open the raw PCM data. (exiting).");
    exit(EXIT_FAILURE);
  }

  audio_buffer.assign(std::istreambuf_iterator<char>(ifs), std::istreambuf_iterator<char>());
  ifs.close();
  
  if (MAL_SUCCESS != mal_device_start(&device)) {
    SX_ERROR("Failed to start the device (exit).");
    exit(EXIT_FAILURE);
  }

  printf("Press enter to quit.");
  getchar();

  mal_device_uninit(&device);
  return 0;
}

/* -------------------------------------------- */

static mal_uint32 audio_callback(mal_device* dev, mal_uint32 frameCount, void* dest) {

  size_t to_read = std::min<size_t>(frameCount * sizeof(uint16_t) * 2, audio_buffer.size());
  memcpy(dest, (&audio_buffer[0]) + bytes_read, to_read);
  bytes_read += to_read;
  
  return to_read;
}

/* -------------------------------------------- */