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

#define DHTPIN 15        // DHT data pin connected to GPIO15
#define DHTTYPE DHT22    // Or use DHT11 if you have that sensor
#define LDRPIN 34        // LDR sensor connected to GPIO34 (analog input)

DHT dht(DHTPIN, DHTTYPE);

const char* ssid = "Wokwi-GUEST";   // Default Wi-Fi for Wokwi
const char* password = "";          // No password

unsigned long myChannelNumber = 3088490;  
const char* myWriteAPIKey = "2XSBMFOWYKJALAX4";

WiFiClient client;

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

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\n✅ WiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Read sensors
  int ldrValue = analogRead(LDRPIN);         // LDR analog reading
  float temperature = dht.readTemperature(); // Temperature in °C

  // Check if temperature is valid
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
  }

  // Print readings
  Serial.print("LDR Value: ");
  Serial.print(ldrValue);
  Serial.print("  |  Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Send to ThingSpeak (Field1 = LDR, Field2 = Temperature)
  ThingSpeak.setField(1, ldrValue);
  ThingSpeak.setField(2, temperature);

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

  if (statusCode == 200) {
    Serial.println("✅ Data sent successfully to ThingSpeak!");
  } else {
    Serial.print("❌ Error sending data. HTTP Code: ");
    Serial.println(statusCode);
  }

  // Update ThingSpeak every 20 seconds (minimum allowed)
  delay(20000);
}