#include <WiFi.h>
#include <ThingSpeak.h>

// WiFi Credentials
const char* ssid = "Wokwi-GUEST";
const char* pass = "";

// ThingSpeak Details
unsigned long myChannelNumber = 3030773;
const char *myWriteAPIKey = "8NP7I4J55NIRJQQ6";

WiFiClient client;

// Pin Definitions
#define LDRPIN 34
#define LED1 21
#define LED2 18
#define LED3 5

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

  pinMode(LDRPIN, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);

  Serial.print("Connecting to WiFi");

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

  Serial.println("\nWiFi Connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  ThingSpeak.begin(client);
}

void loop() {

  // Read LDR value
  int ldrVal = analogRead(LDRPIN);

  Serial.print("LDR Value: ");
  Serial.println(ldrVal);

  // LED Control
  if (ldrVal > 1500) {
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, HIGH);
    Serial.println("LEDs ON");
  } else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
    Serial.println("LEDs OFF");
  }

  // Send data to ThingSpeak
  ThingSpeak.setField(1, ldrVal);

  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.print("Problem writing data. HTTP error code: ");
    Serial.println(statusCode);
  }

  Serial.println("---------------------");

  // ThingSpeak free account update interval
  delay(15000);
}