#include <pebble.h>
#include <pebble-effect-layer/pebble-effect-layer.h>

static Window *s_main_window;
static TextLayer *s_time_layer;
static TextLayer *s_date_layer;
static TextLayer *s_cd_layer;
static EffectLayer *s_effect_layer;

static void main_window_load(Window *window) {
  Layer *window_layer = window_get_root_layer(window);
  GRect bounds = layer_get_bounds(window_layer);

  s_effect_layer = effect_layer_create(bounds);
  effect_layer_add_effect(s_effect_layer, effect_invert, NULL);
  layer_add_child(window_layer,effect_layer_get_layer(s_effect_layer));

  s_time_layer = text_layer_create(
    GRect(0, PBL_IF_ROUND_ELSE(58,52), bounds.size.w, 50)
  );

  // Improve the layout to be more like a watchface
  text_layer_set_background_color(s_time_layer, GColorClear);
  text_layer_set_text_color(s_time_layer, GColorWhite);
  text_layer_set_text(s_time_layer, "00:00");
  text_layer_set_font(s_time_layer, fonts_get_system_font(FONT_KEY_ROBOTO_BOLD_SUBSET_49));
  text_layer_set_text_alignment(s_time_layer, GTextAlignmentCenter);

  // Add it as a child layer to the Window's root layer
  layer_add_child(window_layer, text_layer_get_layer(s_time_layer));

  s_date_layer = text_layer_create(
    GRect(0, PBL_IF_ROUND_ELSE(108,102), bounds.size.w, 50)
  );

  // Improve the layout to be more like a watchface
  text_layer_set_background_color(s_date_layer, GColorClear);
  text_layer_set_text_color(s_date_layer, GColorWhite);
  text_layer_set_text(s_date_layer, "Wed 1st Jan");
  text_layer_set_font(s_date_layer, fonts_get_system_font(FONT_KEY_ROBOTO_CONDENSED_21));
  text_layer_set_text_alignment(s_date_layer, GTextAlignmentCenter);

  // Add it as a child layer to the Window's root layer
  layer_add_child(window_layer, text_layer_get_layer(s_date_layer));
  
  s_cd_layer = text_layer_create(
    GRect(0, PBL_IF_ROUND_ELSE(18,12), bounds.size.w, 50)
  );

  // Improve the layout to be more like a watchface
  text_layer_set_background_color(s_cd_layer, GColorClear);
  text_layer_set_text_color(s_cd_layer, GColorWhite);
  text_layer_set_text(s_cd_layer, "-----==========");
  text_layer_set_font(s_cd_layer, fonts_get_system_font(FONT_KEY_GOTHIC_18));
  text_layer_set_text_alignment(s_cd_layer, GTextAlignmentCenter);

  // Add it as a child layer to the Window's root layer
  layer_add_child(window_layer, text_layer_get_layer(s_cd_layer));
}

static void main_window_unload(Window *window) {
  text_layer_destroy(s_time_layer);
  text_layer_destroy(s_date_layer);
  text_layer_destroy(s_cd_layer);
  effect_layer_destroy(s_effect_layer);
}

static void update_time() {
  time_t temp = time(NULL);
  struct tm *tick_time = localtime(&temp);

  static char s_buffer[8];
  strftime(s_buffer, sizeof(s_buffer), clock_is_24h_style() ? "%H:%M" : "%I:%M", tick_time);

  text_layer_set_text(s_time_layer, s_buffer);
  
  static char d_buffer[12];
  strftime(d_buffer, sizeof(d_buffer), "%a %d %b", tick_time);
  
  text_layer_set_text(s_date_layer, d_buffer);

}

static void tick_handler(struct tm *tick_time, TimeUnits units_changed) {
  update_time();
}

static void init() {
  s_main_window = window_create();

  window_set_window_handlers(s_main_window, (WindowHandlers) {
    .load = main_window_load,
    .unload = main_window_unload
  });

  window_stack_push(s_main_window, true);

  tick_timer_service_subscribe(MINUTE_UNIT, tick_handler);
  update_time();
}

static void deinit() {
  window_destroy(s_main_window);
}


int main(void) {
  init();
  app_event_loop();
  deinit();
  return 0;
}