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

#define DHTTYPE DHT22
#define DHTPIN 4
DHT dht(DHTPIN, DHTTYPE);
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int LED_PIN = 13;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2519972;
const char* myApiKey = "E44OYJ8AUCQ51JQS";
const char* server = "api.thingspeak.com";

WiFiClient client;

void setup() {
  Serial.begin(115200);
  Serial.print("DHT22 ESP32");
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0,0);
  display.print("DHT22");
  display.setCursor(0,30);
  display.print("ESP32");
  display.display();
  delay(2000);

  pinMode(LED_PIN, OUTPUT);
  dht.begin();

  display.clearDisplay();
  display.setCursor(0,30);
  display.print("CHECK WIFI");
  display.display();
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while(WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected");
  }

  display.setCursor(0,30);
  display.println("Wifi Connected !");
  display.display();
  Serial.println("Wifi Connected !");
  Serial.println(("Local IP: " + String(WiFi.localIP())));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (humidity > 80 || temperature > 40) digitalWrite(LED_PIN, 1);
  else digitalWrite(LED_PIN, 0);

  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0,10);
  display.print("Temp = ");
  display.print(temperature);
  display.setCursor(0,30);
  display.print("humi = ");
  display.print(humidity);

  display.display();
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);

  Serial.println("Temp: " + String(temperature, 2) + "C");
  Serial.println("Humidity: " + String(humidity, 1) + "%");

  if (x == 200) {
    Serial.println("Data pushed successfull");
  } else {
    Serial.println("Push Error" + String(x));
  }
  Serial.println("---");
  delay(20000);
}