#include <WiFi.h>
#include "ThingSpeak.h"
#include <Wire.h>           
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128  
#define SCREEN_HEIGHT 64   


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

const int pirPin = 18;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2510596;
const char* myApiKey = "43S60IKLNPA4E5K9";
int pirState = LOW;
int message = 0;

WiFiClient client;

void setup() {
  Serial.begin(115200);
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Wifi not connected");
  }
  Serial.println("Wifi connected!");
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
 

  // Initialize OLED display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000); 
  display.clearDisplay();
  display.setTextSize(1);      
  display.setTextColor(WHITE); 
  display.setCursor(0,0);     
}

void loop() {
  ThingSpeak.setField(2, message);
  int currentPir = digitalRead(pirPin);
  if (currentPir == HIGH) {
    if(pirState == LOW) {
      message = 1;
      displayMessage("Motion detected!");
    }
    pirState = HIGH;
  } else {
    if (pirState == HIGH) {
      message = -1;
      displayMessage("No motion!");
      pirState = LOW;
    }
  }
  if (message != 0) {
    int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);
    delay(1000);
    
      Serial.println("Data pushed successfully!");
      Serial.println("---");
  }
  delay(1000);
  message = 0;
}

void displayMessage(String text) {
  display.clearDisplay();
  display.setCursor(0,0);
  display.println(text);
  display.display();
}