#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>
#include <PubSubClient.h>
// dht
#define DHTPIN 14
#define DHTTYPE DHT22
DHT dht (DHTPIN, DHTTYPE);

// màn hình oled
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// MQTT
const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic = "20004019-TranThanhDat";
// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "";
int Port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);



void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  dht.begin();
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
    for (;;); // Don't proceed, loop forever
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  WIFIConnect();
  display.setCursor(0, 10);
  display.print("Wifi connected");
  display.display();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  delay(2000);
}


void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");

  }

  // Hiện lên oled

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


void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.print(" connected");
      display.setCursor(0, 20);
      display.print("MQTT Topic");
      display.setCursor(0, 30);
      display.print(MQTT_Topic);
      display.display();
      client.subscribe(MQTT_Topic);
      Serial.println("");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String stMessage;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println(stMessage);
  // lcd.clear();
  // lcd.setCursor(0, 0);
  // lcd.print(stMessage);
  // if (stMessage == "on") {
  //   lcd.clear();
  //   lcd.setCursor(0, 0);
  //   lcd.print("On");
  // }

}

void loop() {
  // MQTT
  if (!client.connected()) {
    MQTT_Reconnect();
  }

// DHT
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  // display.clearDisplay();
  // display.setTextSize(1);
  // display.setTextColor(WHITE);
  // display.setCursor(0, 0);
  // // Display static text
  // display.println("Nhiet do");
  // display.setCursor(10, 10);
  // display.println(t);
  // display.display();

  client.loop();


}