#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
#include <WiFiClient.h>
#include <ThingSpeak.h>  // Include the ThingSpeak library

// Define the DHT sensor pina
const int DHT_PIN = 15;
const int LED_PIN = 13;
DHTesp dht;

// Wi-Fi credentials
const char* ssid = "Wokwi-GUEST";  // Wi-Fi SSID
const char* password = "";         // Wi-Fi password

// MQTT settings (Mosquitto server)
const char* mqtt_server = "test.mosquitto.org";  // Mosquitto server URL
WiFiClient espClient;
PubSubClient client(espClient);

// ThingSpeak settings
const int myChannelNumber = 2770545;
const char* writeAPIKey = "TNMVKX4D0UBTTOHI";  // Your ThingSpeak Write API Key
const char* thingspeak_server = "api.thingspeak.com";

unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

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

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

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.publish("/ThinkIOT/Publish", "Welcome");
      client.subscribe("/ThinkIOT/Subscribe");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  dht.setup(DHT_PIN, DHTesp::DHT22);

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

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) {  // Publish data every 2 seconds
    lastMsg = now;
    TempAndHumidity data = dht.getTempAndHumidity();

    String tempStr = String(data.temperature, 2);
    String humStr = String(data.humidity, 1);

    // Publish to MQTT
    client.publish("/Thinkitive/temp", tempStr.c_str());
    client.publish("/Thinkitive/hum", humStr.c_str());

    // Print the values to the Serial Monitor
    Serial.print("Temperature: ");
    Serial.println(tempStr);
    Serial.print("Humidity: ");
    Serial.println(humStr);

    // Update ThingSpeak
    ThingSpeak.setField(1, data.temperature);  // Send temperature to field 1
    ThingSpeak.setField(2, data.humidity);     // Send humidity to field 2
    int response = ThingSpeak.writeFields(myChannelNumber, writeAPIKey);
    if (response == 200) {
      Serial.println("ThingSpeak update successful!");
    } else {
      Serial.println("ThingSpeak update failed: " + String(response));
    }

    // LED Control based on conditions
    if (data.temperature > 35 || data.temperature < 12 || data.humidity > 70 || data.humidity < 40) {
      digitalWrite(LED_PIN, HIGH);  // Turn on the LED if conditions are met
    } else {
      digitalWrite(LED_PIN, LOW);   // Turn off the LED if conditions are met
    }

    Serial.println("Data sent to ThingSpeak");
  }
}