#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const int DHT_PIN = 14;
const int LED_PIN = 12;
const int LPG_PIN = 36;
const int BUZZER_PIN = 13;
int gas;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2448746;
const char* myApiKey = "L767Q6YKB7TDQMLL";
const char* server = "api.thingspeak.com";

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

DHTesp dhtSensor;
WiFiClient client;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LPG_PIN, INPUT);

  if (!display.begin(SSD1306_I2C_ADDRESS, SCREEN_WIDTH, SCREEN_HEIGHT)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);  // Pause for 2 seconds

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Initializing...");
  display.display();

  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Wifi not connected");
    display.setCursor(0, 10);
    display.print("WiFi not connected");
    display.display();
  }
  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("WiFi connected");
  display.display();

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
  delay(2000);
}

void loop() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  gas = analogRead(LPG_PIN);
  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);
  ThingSpeak.setField(3, gas);

  if (data.temperature > 35 || data.temperature < 12 || data.humidity > 70 || data.humidity < 40) {
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);

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

  if (data.temperature > 50) {
    Serial.println("temperature over");
  } else {
    Serial.println("temperature low");
  }

  if (gas >= 100) {
    Serial.println("high gas value");
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  // Display data on the OLED
  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Temp: " + String(data.temperature, 2) + "C");
  display.setCursor(0, 10);
  display.print("Hum: " + String(data.humidity, 1) + "%");
  display.setCursor(0, 20);
  display.print("Gas: " + String(gas));
  display.display();

  Serial.println("---");

  delay(2000);
}