#include <SDL2/SDL.h>
#include <SDL2/SDL_audio.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_ttf.h>

using namespace std;

SDL_AudioSpec want, have;
SDL_AudioDeviceID player;

void SDLCALL callback_player( void* userdata, Uint8* stream, int len)
{

	for (int i = 0; i < len; i ++) {
		auto value = Uint8(sin(i) * 1000);
		stream[i] = value ;
	}
}

auto setupAudioPlayer()
{

	printf("### Device Player ###\n");
	int num = SDL_GetNumAudioDevices(false);
	printf("num: %d\n", num);
	for (int i = 0; i < num; i++) {
		auto name = SDL_GetAudioDeviceName(i, false);
		printf("%d: %s\n", i, name);
	}

	int deviceIndex;
	printf("select device to player audio: ");
	scanf("%d", &deviceIndex);
	printf("\n");

	SDL_memset(&want, 0, sizeof(want)); /* or SDL_zero(want) */
	want.freq = 44100;
	want.format = AUDIO_F32;
	want.channels = 2;
	want.samples = 1024;
	want.callback = callback_player;  // you wrote this function elsewhere.
	//want.size = 512;

	SDL_AudioDeviceID player = SDL_OpenAudioDevice(SDL_GetAudioDeviceName(deviceIndex, false), SDL_FALSE, &want, &have, SDL_AUDIO_ALLOW_FORMAT_CHANGE);
	if (player == 0) {
		printf("Failed to open player device! SDL Error: %s", SDL_GetError());

	} else {

		printf("freq %d \nformat %d \nchannels %d \nsamples %d\n", have.freq, have.format, have.channels, have.samples);
	}

	return player;
}

void destroyAudio()
{

	SDL_CloseAudioDevice(player);
	SDL_Quit();
}

int main(int n, char** args)
{

	int err = SDL_Init(SDL_INIT_AUDIO);
	printf("error: %d", err);
	if (err < 0) {
		printf("erorr: %d\n", err);
		printf("Failed to init audio! SDL Error: %s", SDL_GetError());
	}
	//recorder = setupAudioRecorder();
	auto player = setupAudioPlayer();
	printf("player: %d\n", player);
	//loadWave();

	printf("playing\n");
	//SDL_PauseAudioDevice(recorder, 0);
	SDL_PauseAudioDevice(player, 0);
	//SDL_SemWait(sem);
	SDL_Delay(10000);
	destroyAudio();
	//system("pause");
	return 0;
}