#include <ESP8266WiFi.h>
#include <FirebaseESP8266.h>
#include <addons/TokenHelper.h>
#include <addons/RTDBHelper.h>

#define WIFI_SSID "HUAWEI-930D"
#define WIFI_PASSWORD "49418874"
#define API_KEY "AIzaSyBApzVK8nVRR3G-T0Nn4Bk-BDCpFCn9ujk"
#define DATABASE_URL "mw-ultra-water-level-indicator-default-rtdb.firebaseio.com"
#define USER_EMAIL "[email protected]"
#define USER_PASSWORD "123456789"


////////////////////////////////////////////////////
int maxdistance = 23;
////////////////////////////////////////////////////


long duration;
float distance;
const int TRIGGER = 12; //D6 = GPIO12
const int ECHO    = 14; //D5 = GPIO14

FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

unsigned long sendDataPrevMillis = 0;

int count = 0;

void setup()
{
  pinMode(TRIGGER, OUTPUT);
  pinMode(ECHO, INPUT);
  Serial.begin(115200);
  Serial.println();
  Serial.println();

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(300);
  }
  Serial.println();
  Serial.print("Connected with IP: ");
  Serial.println(WiFi.localIP());
  Serial.println();

  Serial.printf("Firebase Client v%s\n\n", FIREBASE_CLIENT_VERSION);

  /* Assign the api key (required) */
  config.api_key = API_KEY;

  /* Assign the user sign in credentials */
  auth.user.email = USER_EMAIL;
  auth.user.password = USER_PASSWORD;

  /* Assign the RTDB URL (required) */
  config.database_url = DATABASE_URL;

  /* Assign the callback function for the long running token generation task */
  config.token_status_callback = tokenStatusCallback; //see addons/TokenHelper.h

  //Or use legacy authenticate method
  //config.database_url = DATABASE_URL;
  //config.signer.tokens.legacy_token = "<database secret>";

  Firebase.begin(&config, &auth);

  Firebase.reconnectWiFi(true);
#if defined(ESP8266)
  fbdo.setBSSLBufferSize(512, 2048);
#endif
}

void loop()
{
  digitalWrite(TRIGGER, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER, LOW);
  duration = pulseIn(ECHO, HIGH);
  distance = (duration / 2) / 29.1;
  Serial.print(distance);
  Serial.println("Centimeter:");
  if (distance > maxdistance) {
    distance = maxdistance;
  }
  count = map(distance, maxdistance , 4, 0, 100);

  if (count > 100) {
    count = 100;
  }
  Serial.print(count);
  Serial.println("%");

  if (Firebase.ready() && (millis() - sendDataPrevMillis > 1000 || sendDataPrevMillis == 0))
  {
    sendDataPrevMillis = millis();

    Serial.print("Set int async... ");

    for (size_t i = 0; i < 10; i++)
    {
      Firebase.setIntAsync(fbdo, "/WL", count);
    }
    Serial.println("ok");
  }
}