#include "../graphics.c"

i64 time_0        = 0;
i64 audio_samples = 0;

f32 frames[SOUND_SAMPLE_RATE * NUM_SOUND_CHANNELS] = {0};

b8 ui_button(f64 x, f64 y, f64 width, f64 height) {
  b8 has_cursor = g_platform.cursor_x >= x && g_platform.cursor_x < x + width &&
                  g_platform.cursor_y >= y && g_platform.cursor_y < y + height;

  b8 is_pressed = has_cursor && g_platform.key_down[BUTTON_LEFT];

  if (is_pressed)
    fill_rectangle(RGB(1.f, 1.f, 1.f), x, y, width, height);
  else if (has_cursor)
    fill_rectangle(RGB(.8f, .8f, 0.f), x, y, width, height);
  else
    fill_rectangle(RGB(.8f, .8f, .2f), x, y, width, height);

  return has_cursor && g_platform.key_pressed[BUTTON_LEFT];
}

void update_and_render_frame(void) {
  i32 num_events = p_handle_events();

  if (num_events > 0) {
    fill_rectangle(RGB(.1f, .1f, .1f), 0, 0, g_platform.frame_width, g_platform.frame_height);

    if (ui_button(100, 100, 200, 200))
      p_queue_sound(0, SOUND_SAMPLE_RATE, frames);
  }

  i64 samples_elapsed = ((p_time() - time_0) * SOUND_SAMPLE_RATE) / 1000 - audio_samples;
  audio_samples      += samples_elapsed;

  p_handle_audio(samples_elapsed);
  p_render_frame();
  p_sleep_for(0);
}

i32 main(i32 argc, c8 **argv) {
  (void) argc;
  (void) argv;

  g_platform = (Platform) {
    .title         = "Sine Wave",
    .graceful_exit = 1,
  };

  f64 frequency = 440.;

  for (i64 i = 0; i < SOUND_SAMPLE_RATE; ++i) {
    f64 t = ((f64) i) / SOUND_SAMPLE_RATE;
    f64 x = sin(t * (M_PI * 2.) * frequency);
    if (t < .005)
      x *= t / .005;
    if (t > .1)
      x *= (1. - t) / .9;
    frames[i * 2]     = (f32) (x * .5);
    frames[i * 2 + 1] = (f32) (x * .5);
  }

  time_0 = p_time();

  p_event_loop();
  return 0;
}