#include <stdio.h>

#include "SDL.h"
#include "SDL_mixer.h"
#include "SDL_image.h"
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <math.h>

#define NUM_WAVEFORMS 6
const char* _waveFileNames[] = {
  "BANK1/1.wav",
  "BANK1/2.wav",
  "BANK1/3.wav",
  "BANK1/4.wav",
  "BANK1/5.wav",
  "BANK1/6.wav",
};

Mix_Chunk* _sample[6];

int Init(void) {

  memset(_sample, 0, sizeof(Mix_Chunk*) * 6);

  // Set up the audio stream
  int result = Mix_OpenAudio(44100, AUDIO_S16SYS, 2, 512);
  if( result < 0 ) {
    fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
    exit(-1);
  }

  result = Mix_AllocateChannels(4);
  if( result < 0 ) {
    fprintf(stderr, "Unable to allocate mixing channels: %s\n", SDL_GetError());
    exit(-1);
  }

  // Load waveforms
  for( int i = 0; i < NUM_WAVEFORMS; i++ ) {
    _sample[i] = Mix_LoadWAV(_waveFileNames[i]);
    if( _sample[i] == NULL ) {
      fprintf(stderr, "Unable to load wave file: %s\n", _waveFileNames[i]);
    }
  }

  return true;
}

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

  SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO );
  atexit(SDL_Quit);

  SDL_Window* window = SDL_CreateWindow("Sonquencer",
                                        SDL_WINDOWPOS_UNDEFINED,
                                        SDL_WINDOWPOS_UNDEFINED,
                                        800,
                                        600,
                                        SDL_WINDOW_RESIZABLE);

  if (Init() == false) { return -1;}

  SDL_Event Event;

  bool done = false;
  while (!done) {
    bool gotEvent = SDL_PollEvent(&Event);

    while (!done && gotEvent) {
      switch (Event.type) {
        case SDL_KEYDOWN:

          switch (Event.key.keysym.sym) {
            case '1':
              Mix_PlayChannel(-1, _sample[0], 0);
              break;
            case '2':
              Mix_PlayChannel(-1, _sample[1], 0);
              break;
            case '3':
              Mix_PlayChannel(-1, _sample[2], 0);
              break;
            case '4':
              Mix_PlayChannel(-1, _sample[3], 0);
              break;
            case '5':
              Mix_PlayChannel(-1, _sample[4], 0);
              break;
            case '6':
              Mix_PlayChannel(-1, _sample[5], 0);
              break;
            default:
              break;
          }
          break;

            case SDL_QUIT:
              done = true;
              break;

            default:
              break;
      }
      if( !done ) { gotEvent = SDL_PollEvent(&Event); }
    }

    usleep(1000);

  }

  for( int i = 0; i < NUM_WAVEFORMS; i++ ) {
    Mix_FreeChunk(_sample[i]);
  }

  Mix_CloseAudio();
  SDL_Quit();
  return 0;
}