#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 32

#define OLED_RESET     -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const char* ntpServerName = "pool.ntp.org";
const char* ssid_name     = "halo";
const char* password = "salwacantik";

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, ntpServerName);

const int led = 22;
const int tombol1 = 18;
const int tombol2 = 25;

int buttonState1 = 0;
int buttonState2 = 0;

bool alarm_active = false;
int alarm_second = 0;
int alarm_hour = 0;
int alarm_minute = 0;

void setup() {
  pinMode(tombol1, INPUT_PULLUP);
  pinMode(tombol2, INPUT_PULLUP);
  pinMode(led, OUTPUT);

  Serial.begin(115200);

  WiFi.begin(ssid_name, password);
  while (WiFi.status() != WL_CONNECTED) 
  {
    delay(1000);
    Serial.println("menghubungkan ke WiFi...");
  }

  timeClient.begin();
  while(!timeClient.update()) 
  {
    timeClient.forceUpdate();
  }

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) 
  {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0,0);
  display.println("jam dan alarm");
  display.display();
  delay(1000);
}

void loop() 
{
  buttonState1 = digitalRead(tombol1);
  buttonState2 = digitalRead(tombol2);

  display.clearDisplay();
  display.setCursor(0,0);
  display.setTextSize(1);
  display.setTextColor(WHITE);

  time_t currentDate = timeClient.getEpochTime();
  tm *localTime = localtime(&currentDate);
  char* weekDays[] = {"sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"};
  display.println(weekDays[localTime->tm_wday]);
  display.print(localTime->tm_mday);
  display.print("/");
  display.print(localTime->tm_mon + 1);
  display.print("/");
  display.println(localTime->tm_year + 1900);
  display.println(timeClient.getFormattedTime());
  if (buttonState1 == LOW) 
  {
    alarm_hour++;
    if (alarm_hour > 23) 
    {
      alarm_hour = 0;
    }
    display.print("atur alarm ke ");
    display.print(alarm_hour);
    display.print(":");
    display.print(alarm_minute);
    display.print(":");
    display.println(alarm_second);
  }
  if (buttonState2 == LOW) 
  {
    alarm_minute++;
    if (alarm_minute > 59) 
    {
      alarm_minute = 0;
    }
    display.print("atur alarm ke ");
    display.print(alarm_hour);
    display.print(":");
    display.print(alarm_minute);
    display.print(":");
    display.println(alarm_second);
    display.println("alarm berhasil diatur!");
    alarm_active = true;
  }

  if (alarm_active) 
  {
    if (timeClient.getHours() == alarm_hour &&
        timeClient.getMinutes() == alarm_minute &&
        timeClient.getSeconds() == alarm_second) {
      digitalWrite(led, HIGH);
      display.clearDisplay();
      display.setCursor(0,0);
      display.setTextSize(1.5);
      display.setTextColor(WHITE);
      display.println("alarm sudah aktif");
      display.display();
      delay(20000);
      digitalWrite(led, LOW);
      display.clearDisplay();
      display.display();
      alarm_active = false;
    }
  }

  display.display();
  delay(1000);
}