import std.cstream;
import std.string;

import SDL;
import SDL_mixer;

extern (C) {
	void show_magnitude(void* udata, Uint8* s, int len) {
		Uint32 mag = 0;
		for (int i = 0; i < len; i++) {
			Sint8 p = cast(Sint8)*s;
			mag += (p > 0) ? p : -p;
			s++;
		}
		mag /= len;
		mag *= 79;
		mag /= 255;
		for (int i = 0; i < mag; i++) {
			dout.write(cast(char)'#');
		}
		dout.writeLine("");
	}
}

int main(char[][] args) {
	if (args.length < 2) {
		dout.writeLine("HIKISUU KUDASAI");
		return 0;
	}
	dout.writeLine("play " ~ args[1]);

	SDL_Init(SDL_INIT_AUDIO);
	Mix_OpenAudio(22050, AUDIO_S16, 2, 2048);
	Mix_Music* music = Mix_LoadMUS(args[1]);
	Mix_SetPostMix(&show_magnitude, null);
	if (Mix_PlayMusic(music, 1) != 0) {
		dout.writeLine(std.string.toString(SDL_GetError()));
		return 0;
	}
	while (Mix_PlayingMusic()) {
		SDL_Event ev;
		SDL_PollEvent(&ev);
		if (ev.type == SDL_QUIT) break;
		SDL_Delay(33);
	}
	Mix_HaltMusic();
	Mix_FreeMusic(music);
	Mix_CloseAudio();

	SDL_Quit();

	return 0;
}