#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "PubSubClient.h"
int led1 = 2 ;
int digitalpin1 = 13;
int val1 = 0;
int lcdColumns = 16;
int lcdRows = 2;
const int trigPin = 5;
const int echoPin = 18;
long duration;
float distanceCm;
float distanceInch;
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);


const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.hivemq.com";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2;

void setup() {
  pinMode(led1 , OUTPUT);
  pinMode(digitalpin1 , INPUT);
  // initialize LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();
  Serial.begin(115200); // Starts the serial communication
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  Serial.begin(9600);


 Serial.begin(115200);
  randomSeed(analogRead(0));


  delay(10); 

  wifiConnect();  
    
  client.setServer(mqttServer, port);
  client.setCallback(callback);  //if server send something it will run this function
  pinMode(ledPin, OUTPUT);
}

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

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("topicName/led");
    } 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.print(topic);
  Serial.print(". Message: ");
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();

  if (String(topic) == "topicName/led") {
    Serial.print("Changing output to ");
    if(stMessage == "on"){
      Serial.println("on");
      digitalWrite(ledPin, HIGH);
    }
    else if(stMessage == "off"){
      Serial.println("off");
      digitalWrite(ledPin, LOW);
    }
  }
}

  

void loop() {
  val1 = analogRead(digitalpin1);
  Serial.println("ที่จอดรถที่1");
  if (val1 <1000){
    digitalWrite(led1, HIGH);
    Serial.println("ไม่ว่าง");
  }
  else {
    digitalWrite(led1, LOW);
    Serial.println("ว่าง");
  }
  delay(1000);

  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  
  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance in the Serial Monitor
  if (distanceCm<60){
    digitalWrite(trigPin , HIGH);
    Serial.println("ระวังชน!!");
    Serial.print("Distance (cm): ");
   Serial.println(distanceCm);
  }
  else{
    digitalWrite(trigPin , LOW);
    Serial.println("ปลอดภัย");
   Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  }
//  Serial.print("Distance (cm): ");
 // Serial.println(distanceCm);

  // set cursor to first column, first row
  lcd.setCursor(0, 0);
    // print message
  lcd.print("Distance");
  // set cursor to first column, second row
  lcd.setCursor(0,1);
  lcd.print(distanceCm);
  lcd.print(" cm");
  delay(1000);
  
 if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();


  Serial.println(echoPin);  
  Serial.println(digitalpin1);   

  client.publish("dataTemp",String(echoPin).c_str(),true);
  client.publish("dataTemp",String(digitalpin1).c_str(),true);

}