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

// ---------- ThingSpeak Config ----------
const char* ssid = "Wokwi-GUEST";    // WiFi SSID
const char* password = "";           // WiFi password (Wokwi guest has none)
WiFiClient client;

unsigned long myChannelNumber = 3104647;   // 👉 Replace with your ThingSpeak Channel ID
const char * myWriteAPIKey = "YLELU7N4ROOM3UCV"; // 👉 Replace with your ThingSpeak Write API Key

// ---------- Sensor + Actuators ----------
#define DHTPIN 4       
#define DHTTYPE DHT22  
DHT dht(DHTPIN, DHTTYPE);

int ldrPin = 34;       // ESP32 analog pin (use 34 instead of A0)
int bulbPin = 2;       // Bulb LED on GPIO2
int fanPin = 5;        // Fan LED/Motor on GPIO5

int lightThreshold = 2000;   // Adjust for ESP32 ADC (0–4095 range)
float tempThreshold = 30.0;  // Fan ON if temp > 30°C

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

  pinMode(bulbPin, OUTPUT);
  pinMode(fanPin, OUTPUT);

  // ---------- WiFi Setup ----------
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");

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

void loop() {
  // ---------- Read Sensors ----------
  int ldrValue = analogRead(ldrPin);
  float temp = dht.readTemperature();

  Serial.print("LDR Value: ");
  Serial.print(ldrValue);
  Serial.print(" | Temperature: ");
  Serial.println(temp);

  // ---------- Control Bulb ----------
  if (ldrValue < lightThreshold) {
    digitalWrite(bulbPin, HIGH); // Dark → Bulb ON
  } else {
    digitalWrite(bulbPin, LOW);  // Bright → Bulb OFF
  }

  // ---------- Control Fan ----------
  if (temp > tempThreshold) {
    digitalWrite(fanPin, HIGH);  // Fan ON
  } else {
    digitalWrite(fanPin, LOW);   // Fan OFF
  }

  // ---------- Send Data to ThingSpeak ----------
  ThingSpeak.setField(1, ldrValue); // Field1 → Light
  ThingSpeak.setField(2, temp);     // Field2 → Temperature

  int status = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (status == 200) {
    Serial.println("✅ Data sent to ThingSpeak");
  } else {
    Serial.println("❌ Problem sending data, HTTP error code " + String(status));
  }

  delay(20000); // ThingSpeak requires 15+ sec delay between updates
}