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

DHTesp dht;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = ""; // Add your WiFi password here
const int myChannelNumber = 2346352; // Your ThingSpeak channel ID
const char* myApiKey = "ZMCX8SZQCM26KHMM"; // Your ThingSpeak API key
const char* server = "api.thingspeak.com";

// Mapping GPIO <--> DHT Pin
const byte dhtPin = 15;
const byte led1 = 23;
const byte buzz = 12;
#define MQ2 35 // define MQ2 analog pin
#define NOTE_FS5 800
#define NOTE_REST 0

int melody[] = {
  NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_FS5, NOTE_REST
};
int noteDurations[] = {
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};

float temperature = 0.0, humidity = 0.0;
WiFiClient client;
int gas;

void setup() {
  Serial.begin(115200); // Initialize serial
  pinMode(led1, OUTPUT);
  pinMode(buzz, OUTPUT);
  pinMode(MQ2, INPUT);

  dht.setup(dhtPin, DHTesp::DHT22);

  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("WiFi not connected");
  }

  Serial.println("WiFi connected!");
  Serial.println("Local IP: " + String(WiFi.localIP()));

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  humidity = dht.getHumidity();
  temperature = dht.getTemperature();
  gas = analogRead(MQ2);

  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  ThingSpeak.setField(3, gas);

  Serial.printf("Gas: %d\n", gas);
  Serial.println("Temp: " + String(temperature, 2) + "°C");
  Serial.println("Humidity: " + String(humidity, 1) + "%");

  if (gas > 480 || temperature > 50) {
    Serial.println("Dangerous conditions!");
    Serial.println("---");

    for (int i = 0; i < sizeof(melody) / sizeof(melody[0]); i++) {
      digitalWrite(led1, HIGH);
      delay(100);
      digitalWrite(led1, LOW);
      delay(1000);

      int noteDuration = 100 / noteDurations[i];

      if (melody[i] != NOTE_REST) {
        tone(buzz, melody[i], noteDuration);
      }

      delay(noteDuration);
      noTone(buzz);
    }
  }

  // Upload data to ThingSpeak
  int httpCode = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  if (httpCode == 200) {
    Serial.println("Channel update successful");
  } else {
    Serial.println("Error updating channel. HTTP code: " + String(httpCode));
  }

  delay(15000); // Delay for 15 seconds (adjust as needed)
}