#include "WiFi.h"
#include "esp_sleep.h"
#include "driver/gpio.h"
// # define WIFI_SMART_CONFIG
# define WIFI_SSID "Wokwi-GUEST"
# define WIFI_PW ""
# define PIN_ALARM_INTERRUPT GPIO_NUM_19
# define PIN_ALARM_INT_MODE GPIO_INTR_LOW_LEVEL 

void initWifiSmartConfig() {
  /* Set ESP32 to WiFi Station mode */
  WiFi.mode(WIFI_AP_STA);
  /* start SmartConfig */
  WiFi.beginSmartConfig();
  /* Wait for SmartConfig packet from mobile */
  Serial.println("Waiting for SmartConfig.");
  while (!WiFi.smartConfigDone()) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("SmartConfig done.");
  /* Wait for WiFi to connect to AP */
  Serial.println("Waiting for WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi Connected.");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
}

void initWifiHardCode() {
  WiFi.begin(WIFI_SSID, WIFI_PW, 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

}
//Function that prints the reason by which ESP32 has been awaken from sleep
void print_wakeup_reason(){
  esp_sleep_wakeup_cause_t wakeup_reason;
  wakeup_reason = esp_sleep_get_wakeup_cause();
  switch(wakeup_reason)
  {
    case 1  : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
    case 2  : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
    case 3  : Serial.println("Wakeup caused by timer"); break;
    case 4  : Serial.println("Wakeup caused by touchpad"); break;
    case 5  : Serial.println("Wakeup caused by ULP program"); break;
    default : Serial.println("Wakeup was not caused by deep sleep"); break;
  }
}

void setup() {
  Serial.begin(115200);
  print_wakeup_reason();
  ESP_ERROR_CHECK(rtc_gpio_isolate(PIN_ALARM_INTERRUPT));
  ESP_ERROR_CHECK(gpio_wakeup_enable(PIN_ALARM_INTERRUPT, PIN_ALARM_INT_MODE));
  ESP_ERROR_CHECK(esp_sleep_enable_gpio_wakeup(PIN_ALARM_INTERRUPT, PIN_ALARM_INT_MODE));

#ifdef WIFI_SMART_CONFIG
    initWifiSmartConfig();
#else
    initWifiHardCode();
#endif

  Serial.println("Going to sleep now");

  esp_deep_sleep_start();

  Serial.println("This will never be printed");
}


void loop() {
  
}