// ampler.c

#include "ampler.h"

#include "audio.c"
#include "draw.c"

Ampler_state *init() {
	Ampler_state *state = malloc(sizeof Ampler_state);
	SDL_memset(state, 0, sizeof Ampler_state);

	state -> size = sizeof Ampler_state;

	SDL_AudioSpec want = { 0 }, have = { 0 };
	want.freq = SAMPLE_RATE;
	want.format = AUDIO_S16;
	want.channels = CHANNELS;
	want.samples = 512;
	want.callback = NULL; // use que funcs
	want.userdata = NULL;

	state -> playdev = SDL_OpenAudioDevice(
		NULL, // default device
		0, // not capture
		&want,
		&have,
		0 // no changes allowed
	);
	if !(state -> playdev) do
		puts(SDL_GetError());

	// TODO: iterate a directory to load samples
	load_track(state);

	puts("init.");
	return state;
}

int ampler_main(SDL_Window *w, SDL_Renderer *r, Ampler_state **u_data) {
	if *u_data == NULL do *u_data = init();

	u32 old_size = (*u_data) -> size, new_size = sizeof Ampler_state;
	if old_size < new_size do {
		printf("increasing size. %i to %i\n", old_size, new_size);
		Ampler_state *nu = malloc(new_size);
		SDL_memset(nu, 0, new_size);
		SDL_memcpy(nu, *u_data, old_size);
		nu -> size = new_size;
		free(*u_data);
		*u_data = nu;
	}

	Ampler_state *state = *u_data;

	// TODO:
	// Main loop perf timing diff bits, with SDL_GetPerformanceCounter
	// put results in state for last frame's perf, so that we can draw it
	SDL_PauseAudioDevice(state -> playdev, 0); // unpause audio
	udp_init(state);
	while 1 do {
		SDL_Event e;
		while SDL_PollEvent(&e) do
			if e.type == SDL_QUIT do
				goto quit;

		udp_frame(state);
		state -> played_audio_last_frame = audio_frame(state);
		draw_frame(w, r, state);

		// CLEAR UDP MESSAGES, but only after we've played them
		if state -> played_audio_last_frame do
			foreach_ptr(Udp_msg, msg, state -> messages)
				msg -> state = MSG_FREE;

		SDL_Delay(1);

		if !remove("reload-trigger") do {
			SDL_PauseAudioDevice(state -> playdev, 1); // pause audio
			udp_quit(state);
			puts("removed reload-trigger, reloading...");
			return 0;
		}
	}

	quit:
	udp_quit(state);
	return 1;
}