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

// Setup NTP
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 8*3600, 60000);
// 8*3600 = GMT+8 (Malaysia), 60000 = update setiap 60s

// Definisi saiz skrin
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Buat objek display
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


const char* ssid = "kingfinix";      // tukar ikut wifi awak
const char* password = "09090909";

WebServer server(80);

#define RELAY_PIN 2  // tukar ikut pin relay awak

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

// Mula display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
      Serial.println(F("OLED tak detect! Semak wiring..."));
          for(;;); // Stop kalau tak jumpa
            }

              display.clearDisplay();

                // Teks demo
              display.setTextSize(2);      
              display.setTextColor(SSD1306_WHITE);  
              display.setCursor(0,10);     
              display.println("Hello!");
              display.display();           
              delay(2000);

  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, HIGH); // mula-mula relay 

  WiFi.begin(ssid, password);
  Serial.print("Sambung WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("ESP32 IP: ");
  Serial.println(WiFi.localIP());

  // Bila dapat request /on → hidupkan relay
  server.on("/on", []() {
    digitalWrite(RELAY_PIN, LOW);
    server.send(200, "text/plain", "Relay ON");
    Serial.println("Relay ON");
  });

  // Bila dapat request /off → matikan relay
  server.on("/off", []() {
    digitalWrite(RELAY_PIN, HIGH);
    server.send(200, "text/plain", "Relay OFF");
    Serial.println("Relay OFF");
  });

  server.begin();
  Serial.println("Server bermula");
}

void loop() {
  server.handleClient();
  
}