#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>


const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* hostname = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_9077874C"; // yourStudentID must be unique
int PORTNUM = 1883;


void setup_wifi()
{
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("Given IP by the router to ESP32 is ");
  Serial.println(WiFi.localIP());

}


#define DHTPIN 4
#define DHTTYPE DHT22
#define LED_PIN 27
#define LED1_PIN 25
#define BUZZER_PIN 26

#define TEMP_LOW 23
#define TEMP_HIGH 25
#define HUMI_LOW 40
#define HUMI_HIGH 60

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);



void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pinMode(LED1_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  Serial.begin(9600);
  delay(5000);

    // Init
  lcd.init();
  lcd.backlight();
    // Print something
  lcd.setCursor(4, 0);
  lcd.print("T&H Fire");
  lcd.setCursor(2, 1);
  lcd.print("Alarm System");
  delay(1000);
  lcd.clear();
  setup_wifi();
  setup_MQTT();

}

void loop() {
  float temp = dht.readTemperature();
  float humi = dht.readHumidity();

  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.println("'C");

  Serial.print("Humidity: ");
  Serial.print(humi);
  Serial.println("%");

  Serial.println("---");

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print("'C");

  lcd.setCursor(0, 1);
  lcd.print("Humi: ");
  lcd.print(humi);
  lcd.print(" %");

  delay(1000);


  if(temp > TEMP_HIGH)
  {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("High Temp");
    lcd.setCursor(0, 1);
    lcd.print("Need Cooling");
    delay(1000);
    lcd.clear();
    if (humi < HUMI_LOW)
    {
      digitalWrite(LED_PIN, HIGH); // Turn on Red LED
      tone(BUZZER_PIN, 1000); // Turn on buzzer
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("LowHumi");
      lcd.setCursor(0, 1);
      lcd.print("Need to Humdify");
      delay(1000);
      digitalWrite(LED_PIN, LOW); // Turn off Red LED
      noTone(BUZZER_PIN); // Turn off buzzer
      lcd.clear();
    }
    else if (humi > HUMI_HIGH)
    {
      digitalWrite(LED_PIN, HIGH); // Turn on Red LED
      tone(BUZZER_PIN, 1000); // Turn on buzzer
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("High Humi");
      lcd.setCursor(0, 1);
      lcd.print("Need to Dehumdify");
      delay(1000);
      digitalWrite(LED_PIN, LOW); // Turn off Red LED
      noTone(BUZZER_PIN); // Turn off buzzer
      lcd.clear();
    }
  }
  else if(temp < TEMP_LOW)
  {
    digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Low Temp");
    lcd.setCursor(0, 1);
    lcd.print("Beware Cold");
    delay(1000);
    digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
    lcd.clear();
    if(humi < HUMI_LOW)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Low Humidity");
      lcd.setCursor(0, 1);
      lcd.print("Need to Humdify");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
    else if(humi > HUMI_HIGH)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("High Humi");
      lcd.setCursor(0, 1);
      lcd.print("Need to Dehumdify");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
  }
  else if(temp > TEMP_LOW & temp < TEMP_HIGH)
  {
    if(humi < HUMI_LOW)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Low Humidity");
      lcd.setCursor(0, 1);
      lcd.print("Drink Water");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
    else if(humi > HUMI_HIGH)
    {
      digitalWrite(LED1_PIN, HIGH); // Turn on Blue LED
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Need to Humdify");
      lcd.setCursor(0, 1);
      lcd.print("Need to Dehumdify");
      delay(1000);
      digitalWrite(LED1_PIN, LOW); // Turn off Blue LED
      lcd.clear();
    }
  }

}




void connectMQTT()
{
  while(!client.connected() )
  {
    Serial.println("Connecting to MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.println("Connected");
      MQTTSubscribe();
    }
    else
    {
      Serial.print("Failed with state ");
      Serial.print(client.state() );
      delay(2000);
    }
  }
}

void callback(String topic, byte* payload, unsigned int length)
{
  String messageTemp;
  Serial.print("Message received in topic: ");
  Serial.print(topic);
  Serial.print(" length is: ");
  Serial.println(length);

  Serial.print("Data received from broker: ");
  for (int i = 0; i<length; i++)
  {
    Serial.print( (char)payload[i] );
    messageTemp += (char)payload[i];
  }

  if (topic == "9077874C/ROOM/IOT")
  {
    Serial.print("ADC value received back = ");
    Serial.println(messageTemp);
  }

}

void MQTTSubscribe() 
{
  client.subscribe("9077874C/room/analogADC");
}

void setup_MQTT() 
{
  client.setServer(hostname, PORTNUM);
  client.setCallback(callback); 
}