#include <WiFi.h>
#include "DHTesp.h"
#include <LiquidCrystal_I2C.h>
#define TRIG_PIN 5 // ESP32 pin GPIO23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 18 // ESP32 pin GPIO22 connected to Ultrasonic Sensor's ECHO pin

#define LED_PIN 32
#define DHT_PIN 15
#define timeSeconds 10

DHTesp dhtSensor;
float duration_us, distance_cm;
const int motionSensor = 13;
const int led = 26;

// Timer: Auxiliary variables
unsigned long now = millis();
unsigned long lastTrigger = 0;
boolean startTimer = false;
boolean motion = false;

// Checks if motion was detected, sets LED HIGH and starts a timer
void IRAM_ATTR detectsMovement() {
  digitalWrite(led, HIGH);
  startTimer = true;
  lastTrigger = millis();
}




LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup() {
  //setup for serial communication
  Serial.begin(9600);
  Serial.print("ESP32 collecting sensors data");

  // configure the trigger pin to output mode
  pinMode(TRIG_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO_PIN, INPUT);

  //setup for dht sensor
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  //config LED_PIN output
  pinMode(LED_PIN, OUTPUT);

  // PIR Motion Sensor mode INPUT_PULLUP
  pinMode(motionSensor, INPUT_PULLUP);
  // Set motionSensor pin as interrupt, assign interrupt function and set RISING mode
  attachInterrupt(digitalPinToInterrupt(motionSensor), detectsMovement, RISING);

  // Set LED to LOW
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);


  lcd.init(); // initialize the lcd 
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("Hello, world!");

}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH);
  distance_cm = (duration / 2) / 29.09;
  Serial.println(distance_cm);

  if(distance_cm >= 100){
    Serial.println("the tank is full ");
  }
  else if(distance_cm >= 50 && distance_cm < 100){
    Serial.println(("the tank if at 50 % of capacity "));
  }
  else if(distance_cm >=20 && distance_cm < 50 ){
    Serial.println(("the tank is near to empty"));
  }
  else{
    Serial.println(("the tank is empty"));
  }
  delay(3000);

  // Current time
  now = millis();
  if((digitalRead(led) == HIGH) && (motion == false)) {
    Serial.println("MOTION DETECTED!!!");
    motion = true;
  }
  // Turn off the LED after the number of seconds defined in the timeSeconds variable
  if(startTimer && (now - lastTrigger > (timeSeconds*1000))) {
    Serial.println("Motion stopped...");
    digitalWrite(led, LOW);
    startTimer = false;
    motion = false;
  }


  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Temp: " + String(data.temperature, 2) + "C");
  lcd.setCursor(0,1);
  lcd.print("Humidity: " + String(data.humidity, 2) + "%");
  delay(2000);

  digitalWrite(LED_PIN, HIGH);
  delay(500); // TODO: Build something amazing!
  digitalWrite(LED_PIN, LOW);
  delay(500);
}