#include <WiFi.h>    
#include <HTTPClient.h>
#include <UrlEncode.h>

//LCD BANG////////////////////////////////////////////////////////
#include <LiquidCrystal_I2C.h>

// set the LCD number of columns and rows
int lcdColumns = 16;
int lcdRows = 2;

// set LCD address, number of columns and rows
// if you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);  
/////////////////////////////////////////////////////////////////

#define ECHO_PIN 2
#define TRIG_PIN 4

int x=0;
int y=0;

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

// +international_country_code + phone number
// Portugal +351, example: +351912345678
String phoneNumber = "905437251435";
String apiKey = "115530";

void sendMessage(String message){

  // Data to send with HTTP POST
  String url = "https://api.callmebot.com/whatsapp.php?phone=" + phoneNumber + "&apikey=" + apiKey + "&text=" + urlEncode(message);    
  HTTPClient http;
  http.begin(url);

  // Specify content-type header
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  
  // Send HTTP POST request
  int httpResponseCode = http.POST(url);
  if (httpResponseCode == 200){
    Serial.print("Message sent successfully");
  }
  else{
    Serial.println("Error sending the message");
    Serial.print("HTTP response code: ");
    Serial.println(httpResponseCode);
  }

  // Free resources
  http.end();
}


void indicator(){
  float distance = readDistanceCM();

  if(distance>=100 && x==0){
  // Send Message to WhatsAPP
  String message = "Distance: ";
  message += String(distance);
  sendMessage(message);
  digitalWrite(13,HIGH);
  x=1;
  y=0;
  }

  if(x==1){}
  if(y==1){}

  if(distance<=100 && y==0){
  // Send Message to WhatsAPP
  String message = "Distance: ";
  message += String(distance);
  sendMessage(message);
  digitalWrite(13,LOW);
  y=1;
  x=0;
  }}

void baca_sensor(){
  float distance = readDistanceCM();
  Serial.print("distance(CM): ");
  Serial.println(readDistanceCM());
  Serial.println();
  delay(100);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void LCD_setting(){ 
  if(digitalRead(13)==HIGH){
  lcd.setCursor(5, 0);
  lcd.print("FULL");
  delay(1000);
  lcd.clear();
  lcd.setCursor(5,0);
  lcd.print("FULL");
  delay(1000);
  lcd.clear(); }

  if(digitalRead(13)==LOW){
  lcd.setCursor(4, 0);
  lcd.print("EMPTY");
  delay(1000);
  lcd.clear();
  lcd.setCursor(4,0);
  lcd.print("EMPTY");
  delay(1000);
  lcd.clear(); }
}

void setup() {
  Serial.begin(115200);

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());

  // initialize LCD
  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();

  
  pinMode(13, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  baca_sensor();
  indicator();
  LCD_setting();

}