#include "DHT.h"
#include <Arduino.h>
#include <WiFi.h>
#include <Firebase_ESP_Client.h>
#include <TinyGPSPlus.h>
#include "time.h"
#include "addons/TokenHelper.h"
#include "addons/RTDBHelper.h"

#define WIFI_SSID "Saud"
#define WIFI_PASSWORD "saud112233"
#define API_KEY "AIzaSyADNmTRkiRXx1lV0lnK3uH6z-BAfjG8NrY"
#define USER_EMAIL "MedicalTruckSafety@gmail.com"
#define USER_PASSWORD "123456789"
#define DATABASE_URL "medicaltrucksafety-32e85-default-rtdb.firebaseio.com"
FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;
FirebaseJson json;

TinyGPSPlus gps;
String stringURL = "";
String gpsSpeed;
String gpsLon;
String gpsLat;
String databasePath;
String uid;
String parentPath;
String speedPath        = "/Speed";
String mapLatPath       = "/Lat";
String mapLonPath       = "/Lon";

unsigned long dataMillis = 0;

void setup() {

  Setup_Sensors_And_Connect_To_WiFi_And_Firebase();
  delay(5000);
}

void loop() {
  GPS_Modem_Read();
  ////////////////////////////////////////////////////////////////////////////
  stringURL = "http://www.google.com/maps/place/" + gpsLat + "," + gpsLon;
  ////////////////////////////////////////////////////////////////////////////

  if (millis() - dataMillis > 5000 && Firebase.ready())
  {
    dataMillis = millis();
    parentPath = databasePath;

    ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    json.set(speedPath.c_str()        , String(gpsSpeed));
    json.set(mapLatPath.c_str()       , String(gpsLat));
    json.set(mapLonPath.c_str()       , String(gpsLon));
    Serial.printf("Set json... %s\n", Firebase.RTDB.setJSON(&fbdo, parentPath.c_str(), &json) ? "ok" : fbdo.errorReason().c_str());
    ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

  }
}



void Setup_Sensors_And_Connect_To_WiFi_And_Firebase() {
  Serial.begin(115200);
  Serial2.begin(9600);//Serial Channel for GPS with ESP32 [TX2+RX2]

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(1000);
  }
  Serial.println(WiFi.localIP());
  Serial.println();
  // 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;

  Firebase.reconnectWiFi(true);
  fbdo.setResponseSize(4096);

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

  // Assign the maximum retry of token generation
  config.max_token_generation_retry = 5;

  // Initialize the library with the Firebase authen and config
  Firebase.begin(&config, &auth);

  // Getting the user UID might take a few seconds
  Serial.println("Getting User UID");
  while ((auth.token.uid) == "") {
    Serial.print('.');
    delay(1000);
  }
  // Print user UID
  uid = auth.token.uid.c_str();
  Serial.print("User UID: ");
  Serial.println(uid);

  // Update database path
  databasePath ="/Data";

}




void GPS_Modem_Read() {
  if (Serial2.available() > 0) {
    if (gps.encode(Serial2.read())) {
      if (gps.location.isValid()) {
        float gpslat_float = gps.location.lat();
        gpsLat = String(gpslat_float, 6);
        Serial.print(F("- latitude: "));
        Serial.println(gpsLat);
        float gpslon_float = gps.location.lng();
        gpsLon = String(gpslon_float, 6);
        Serial.print(F("- longitude: "));
        Serial.println(gpsLon);
      } else {
        Serial.println(F("- location: INVALID"));
      }
      Serial.print(F("- speed: "));
      if (gps.speed.isValid()) {
        float speedInKmph = gps.speed.kmph();
        gpsSpeed = String(speedInKmph, 2);
        Serial.print(gpsSpeed);
        Serial.println(F(" km/h"));
      } else {
        Serial.println(F("INVALID"));
      }
      Serial.println();
    }
  }
  if (millis() > 5000 && gps.charsProcessed() < 10)
    Serial.println(F("No GPS data received: check wiring"));
}