#include <pebble.h>

static Window *s_main_window;
static TextLayer *s_text_layer;

// ==================== BUTTON HANDLERS ====================

static void select_click_handler(ClickRecognizerRef recognizer, void *context) {
  text_layer_set_text(s_text_layer, "Hello!");
  APP_LOG(APP_LOG_LEVEL_INFO, "SELECT pressed - Hello!");
}

static void down_click_handler(ClickRecognizerRef recognizer, void *context) {
  APP_LOG(APP_LOG_LEVEL_INFO, "DOWN pressed - Quitting app...");
  window_stack_pop_all(false);   // Cleanly quit the app
}

// ==================== CLICK CONFIG ====================

static void click_config_provider(void *context) {
  window_single_click_subscribe(BUTTON_ID_SELECT, select_click_handler);
  window_single_click_subscribe(BUTTON_ID_DOWN,  down_click_handler);
}

// ==================== WINDOW LOAD / UNLOAD ====================

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

  s_text_layer = text_layer_create(GRect(0, 20, bounds.size.w, bounds.size.h - 40));
  text_layer_set_background_color(s_text_layer, GColorClear);
  text_layer_set_text_color(s_text_layer, GColorBlack);
  text_layer_set_text_alignment(s_text_layer, GTextAlignmentCenter);
  text_layer_set_font(s_text_layer, fonts_get_system_font(FONT_KEY_GOTHIC_28_BOLD));
  text_layer_set_text(s_text_layer, "Press SELECT\nfor Hello\n\nDOWN to quit");

  layer_add_child(window_layer, text_layer_get_layer(s_text_layer));
}

static void window_unload(Window *window) {
  text_layer_destroy(s_text_layer);
}

// ==================== APP INIT / DEINIT ====================

static void init(void) {
  s_main_window = window_create();
  window_set_click_config_provider(s_main_window, click_config_provider);
  window_set_window_handlers(s_main_window, (WindowHandlers) {
    .load = window_load,
    .unload = window_unload,
  });

  window_stack_push(s_main_window, true);
}

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

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