#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define PHOTO_RESISTOR_PIN A0

WiFiClient client;

const char *ssid = "Wokwi-GUEST";
const char *password = "";
const char *host = "api.thingspeak.com";
String apiKey = "8RPM06NW2Y4NSTB4";

#define OLED_ADDR 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);
  delay(1000);
  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  display.display();
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
  Serial.println("WiFi connected");
}

void loop() {
  delay(2000);
  int lightValue = analogRead(PHOTO_RESISTOR_PIN);
  Serial.print("Photoresistor value: ");
  Serial.println(lightValue);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Light: " + String(lightValue));
  display.display();

  if (client.connect(host, 80)) {
    String url = "/update?api_key=";
    url += apiKey;
    url += "&field1=";
    url += String(lightValue);
    Serial.print("Requesting URL: ");
    Serial.println(url);
    client.print("GET ");
    client.print(url);
    client.println(" HTTP/1.1");
    client.println("Host: " + String(host));
  } else {
    Serial.println("Failed");
  }
  delay(1000);
  while (client.available()) {
    char c = client.read();
    Serial.write(c);
  }
  client.stop();
  delay(20000); 
}