// Written by: Widyo Rio
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#include <WiFi.h>
#include <Wire.h>

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
#define SCREEN_ADDRESS 0x3C

// LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


#define NTP_SERVER     "pool.ntp.org"
// #define NTP_SERVER "ntp.bmkg.go.id"
#define UTC_OFFSET     25200
#define UTC_OFFSET_DST 7

const int NUM_POINTS = 60;
const int RADIUS = 26;
int pointsX[NUM_POINTS];
int pointsY[NUM_POINTS];
int detik, menit,jam;

void BacaWaktu()
{
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    display.print("Connection Err");
    display.display();
    return;
  }
  detik = timeinfo.tm_sec;
  menit = timeinfo.tm_min;
  jam =  timeinfo.tm_hour;

  if (jam>12) jam=jam-12;
  
  Serial.println("Jam  : "+String(jam));
  Serial.println("Menit: "+String(menit)); 
  Serial.println("Detik: "+String(detik));
       
}

  bool isKelipatan5(int angka) {
    // Fungsi ini mengembalikan nilai true jika angka merupakan kelipatan 5, dan false sebaliknya
    return (angka % 5 == 0);
  }

void TampilanAnalog(){
  float secAngle = map(detik, 0, 60, 0, 360);
  float minAngle = map(menit, 0, 60, 0, 360);
  // float hrAngle = map(jam, 1, 12, 30, 360);
  float hrAngle = map(jam*60+menit, 0, 720, 0, 360);

  //calculate the positions of the hands
  int hrX = 64 + (RADIUS - 14) * cos((hrAngle - 90) * PI / 180);
  int hrY = 31 + (RADIUS - 14) * sin((hrAngle - 90) * PI / 180);
  int minX = 64 + (RADIUS - 7) * cos((minAngle - 90) * PI / 180);
  int minY = 31 + (RADIUS - 7) * sin((minAngle - 90) * PI / 180);
  int secX = 64 + (RADIUS+2)*cos((secAngle - 90) * PI / 180);
  int secY = 31 + (RADIUS+2)*sin((secAngle - 90) * PI / 180);

  display.clearDisplay();  //clear the display buffer

  //draw the clock face
  display.drawCircle(64, 31, 31, WHITE);  //Draw a Center Point
  display.fillCircle(64, 31, 2, WHITE);

  
  //Draw 12 Clock points
  for (int i = 0; i < NUM_POINTS; i += 5) {
    if ((i==0)||(i==15)||(i==30)||(i==45)){
      // do nothing
    } else display.fillCircle(pointsX[i], pointsY[i], 1, WHITE); 
      // display.drawPixel(pointsX[i], pointsY[i], WHITE);     
 
  }

  //Display Numbers 12-3-6-9
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  for (int i = 12; i > 1; i -= 3) {
    float angle = map(i, 1, 12, 30, 360);
    int xPos = 64 + (RADIUS - 1) * cos((angle - 90) * PI / 180) - 3;
    int yPos = 31 + (RADIUS - 1) * sin((angle - 90) * PI / 180) - 3;
    display.setCursor(xPos, yPos);
    display.print(i);
  }

  //draw the hour hand
  display.drawLine(64, 31, hrX, hrY, WHITE);

  //draw the minute hand
  display.drawLine(64, 31, minX, minY, WHITE);

  //draw the Second hand
  //display.drawLine(64, 31, secX, secY, WHITE);
  display.drawCircle(secX, secY, 2, WHITE);

  //update the display
  display.display();
}

void UpdateWaktu(){
    detik = detik +1;
    if (detik==60)
    {
      detik = 0; menit = menit+1;
      if (menit==60)
      {
        menit = 0; jam = jam+1;
        BacaWaktu();   
      }  
      if (isKelipatan5(menit)) BacaWaktu();  
    }
   TampilanAnalog();
}

void setup() {
  Serial.begin(115200);

  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);

  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    display.print("."); display.display();
  }
  display.clearDisplay();

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

  display.setCursor(0, 0);
  display.println("Updating time...");

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  BacaWaktu();
}

void loop() {
  UpdateWaktu();
  delay(1000);
}