#include <Arduino.h>
#include <WiFi.h>
#include <FirebaseESP32.h>
#include <addons/TokenHelper.h>
#include <addons/RTDBHelper.h>
#include <TinyGPSPlus.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

#define btn 21
#define echoPin 23 // Echo Pin
#define trigPin 22 // Trigger Pin

int f = 0 ;
int distance_FULL_BIN = 20;
int btn_state = 0;
long duration, distance;
//--------------------------Firebase Variables
String string_lat = "0.00";
String string_lng = "0.00";
String formattedDate;
String dayStamp;
String timeStamp;
String binState;// Empty/Full
//---------------------------------------------

TinyGPSPlus gps;
const unsigned long interval = 1000; // Send every 5 seconds
unsigned long previousMillis = 0;

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

#define WIFI_SSID "7771"
#define WIFI_PASSWORD "112345677"
#define API_KEY "AIzaSyBpMXzUecKFHuAepfFcDIt-4Cq-YE_ucRg"
#define USER_EMAIL "aiioq111112@gmail.com"
#define USER_PASSWORD "123456789"
#define DATABASE_URL "project-b1c1d-default-rtdb.firebaseio.com"
#define DATABASE_SECRET "iD1W8EpEndvrza8891JtQSnvUVpVbXJnno5RWYkw"
FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

unsigned long dataMillis = 0;

void setup() {

  Serial.begin(115200);
  Serial2.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(btn, INPUT_PULLUP);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(300);
  }
  timeClient.begin();
  timeClient.setTimeOffset(10800);
  Serial.println();
  Serial.print("Connected with IP: ");
  Serial.println(WiFi.localIP());
  Serial.println();
  Serial.printf("Firebase Client v%s\n\n", FIREBASE_CLIENT_VERSION);
  config.api_key = API_KEY;
  auth.user.email = USER_EMAIL;
  auth.user.password = USER_PASSWORD;
  config.database_url = DATABASE_URL;
  Firebase.reconnectNetwork(true);
  fbdo.setBSSLBufferSize(4096, 1024);
  fbdo.setResponseSize(4096);
  String base_path = "/UsersData/";
  config.token_status_callback = tokenStatusCallback; // see addons/TokenHelper.h
  Firebase.begin(&config, &auth);
  String var = "$userId";
  String val = "($userId === auth.uid && auth.token.premium_account === true && auth.token.admin === true)";
  Firebase.setReadWriteRules(fbdo, base_path, var, val, val, DATABASE_SECRET);
}


void loop() {
  gps_loop();
  send_to_firebase();
  time_and_date();
  ultrasonic ();
  read_btn();

  if (distance > distance_FULL_BIN && btn_state == 0 && f == 0) {
    f = 1;
    time_and_date_send_to_firebase();
    }

}//end of Loop

void gps_loop() {
  while (Serial2.available() > 0) {
    if (gps.encode(Serial2.read())) {
      if (gps.location.isValid()) {
        string_lat = String(gps.location.lat(), 6);
        string_lng = String(gps.location.lng(), 6);
        Serial.print("Latitude: ");
        Serial.println(string_lat);
        Serial.print("Longitude: ");
        Serial.println(string_lng);
      }
      else {
        string_lat = "21.861541";
        string_lng = "39.067064";
        // Serial.println("inv..");
      }
    }
  }
}

void time_and_date() {
  while (!timeClient.update()) {
    timeClient.forceUpdate();
  }
  formattedDate = timeClient.getFormattedDate();
  //Serial.println(formattedDate);
  // Extract date
  int splitT = formattedDate.indexOf("T");
  dayStamp = formattedDate.substring(0, splitT);
  Serial.print("DATE: ");
  Serial.println(dayStamp);
  // Extract time
  timeStamp = formattedDate.substring(splitT + 1, formattedDate.length() - 1);
  Serial.print("HOUR: ");
  Serial.println(timeStamp);
  //delay(1000);

}

void send_to_firebase() {
  if (millis() - dataMillis > 5000 && Firebase.ready()) {
    dataMillis = millis();
    Firebase.setString(fbdo, "/lat", string_lat);
    Firebase.setString(fbdo, "/lng", string_lng);
    Firebase.setString(fbdo, "/Bin_State", binState);

  }
}

void time_and_date_send_to_firebase() {
  if (Firebase.ready()) {
    Firebase.setString(fbdo, "/empty", 1);//flag for Android App
    Firebase.setString(fbdo, "/time", timeStamp);
    Firebase.setString(fbdo, "/date", dayStamp);
  }
}

void ultrasonic () {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  //Serial.println(distance);
  delay(10);
  if (distance > distance_FULL_BIN) {
    binState = "Empty";
  }
  else {
    binState = "Full";
    f = 0;
  }
}
void read_btn() {
  btn_state = digitalRead(btn);
  Serial.print(btn_state);
  Serial.print("  |  ");
}