#include "DHTesp.h"
#include <PubSubClient.h>
#include <WiFi.h>
#include <LiquidCrystal.h>

int relay = 4;
const int DHT_PIN = 15;
LiquidCrystal lcd(19, 23, 27, 26, 25, 33);

DHTesp dhtSensor;


const char* ssid = "Wokwi-GUEST";
const char* password = "";

//***Set server***
const char* mqttServer = "broker.mqtt-dashboard.com"; 
int port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void wifiConnect() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" Connected!");
}

void mqttReconnect() {
  while(!client.connected()) {
    Serial.println("Attemping MQTT connection...");
    //***Change "123456789" by your student id***
    if(client.connect("20127569")) {
      Serial.println("connected");

      //***Subscribe all topic you need***
      client.subscribe("20127569/Temperature");
      client.subscribe("20127569/Humidity");
      client.subscribe("20127569/button");
    }
    else {
      Serial.println("try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(relay, OUTPUT);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  lcd.begin(16, 2);
  Serial.begin(9600);
  Serial.print("Connecting to WiFi");
  pinMode(15, OUTPUT);

  wifiConnect();
  client.setServer(mqttServer, port);
  client.setCallback(callback);
}

//MQTT Receiver
void callback(char* topic, byte* message, unsigned int length) {
  Serial.println(topic);
  String strMsg;
  for(int i=0; i<length; i++) {
    strMsg += (char)message[i];
  }
  Serial.println(strMsg);
  // Nếu button được bấm thì bơm sẽ chạy 5 giây
  if(strMsg == "true"){
    lcd.clear();
    digitalWrite(relay, HIGH);
    lcd.print("ON");
    delay(5000);
  }
}

void loop() {
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  String temperature = String(data.temperature, 2);
  String humidity = String(data.humidity, 1);
  char t[50],h[50];
  
  // từ string sang char[]
  for(int i = 0;i<temperature.length();++i){
    t[i] = temperature[i];
  }
  for(int i = 0;i<humidity.length();++i){
    h[i] = humidity[i];
  }
  
  //Serial.println(t);
  //Serial.println(h);
  if(!client.connected()) {
    mqttReconnect();
  }
  client.loop();

  // Quyết định bật/tắt bơm nước
  if(t[0] != '-' ){
    lcd.clear();
    digitalWrite(relay, HIGH);
    lcd.print("ON");
  }
  else{
    lcd.clear();
    digitalWrite(relay, LOW);
    lcd.print("OFF");
  }

  //***Change code to publish to MQTT Server***
  // Truyền thông tin sang Node-RED
  client.publish("20127569/Temperature", t);
  client.publish("20127569/Humidity", h);
  delay(5000);
}